I wrote this article a few years ago in an attempt to dispel the myth that it is not possible to alter the engine control unit`s factory settings.

In fact the simple procedure outlined below should be performed after every performance mod. (such as fitting a cold air intake) & can even be of benefit if you`ve spent the whole week stuck in commuter traffic jams & want to restore your cars performance for the weekend!.

Resetting Your ECU (Engine Control Unit)
Hyundai cars are designed to be driven in all areas of the world, by people of all ages and levels of experience and sophistication. They are set to operate at all altitudes and temperatures and to use fuels of varying octane-rating and purity.
Unsurprisingly, the electronic engine control unit of your vehicle has been pre-set to a `one-size-fits-all` state of tune. Whilst the ECU has the capacity to adapt to the owners driving-style to a certain degree, the base-settings are extremely conservative and Hyundai's are famously set to run rich!

Most owners would naturally suppose that this situation is something over which they have no control, this is not the case.
This document will instruct any owner on how to change the ECU settings of their car, without the alterations being detectable by the Dealership, the Insurance Company, or indeed having any effect on the vehicle's warranty.
The operations described are recommended as a first step after taking over ownership of the car, after carrying out any performance modifications, or after any temporary change in the way the vehicle has been used ( i.e. city-bound use, towing etc.).

Firstly bring the car to normal operating temperature by driving for 15 minutes or so.
Now open the bonnet and disconnect the earth lead from the battery, ensure this is not touching any part of the bodywork - insulate if necessary - and wait 5 minutes.
Next depress the foot brake for 20 seconds - this will completely discharge the ECU's capacitors via the brake lights.
The next step (to be carried out immediately, while the engine is still warmed-up) is to carefully re-connect the battery earth lead, close the bonnet and now drive the car in a spirited fashion (accelerating rapidly through the gears, full-throttle straights etc. etc.) for a full 30 minutes. Try to choose a quiet time on the roads for this, (i.e. early on a Sunday morning!).

This period of driving will `re-educate` your ECU into adopting more aggressive timing curves and alter the fuelling to match. It will also allow the unit to recognise any modifications you have made and to react accordingly.
If, on the other hand, you are not interested in outright performance, but are more concerned with economy and flexibility, use your normal driving style during this 30-minute run!.

Over time, the ECU will slowly revert to the factory settings......especially if it is not being driven `spiritedly` on a regular basis.
Accordingly, many owners tend to do this reset monthly, or before a track day or even a long run.

Cheers,
Nick.

First & formost there are TWO distinct S-Coupe`s......The Mk.I car (up to & including `92) & the Mk.II (`93 to `95).
Only the Mk.II was available turbocharged.....with the Garrett T15.

The Mk.I car has a Mitsubishi engine (tranny on left as you face it) & ONLY this car can take other Mitsu. engines!.

The Mk. II car has Hyundai`s own in-house designed Alpha I engine....tranny on right.
The later `95 models featured modern distributor-less ignition with twin wasted-spark coil packs.

Any T2 Series Garrett turbocharger (T20/T25/T28) will bolt up & replace the turbo on the S-Coupe Turbo model, BUT, because of the flange & internal porting, it MUST have a stock Garrett flange OR be ex-Nissan............Mitsu/DSM flanges are NOT suitable & WON`T fit!.

Here is a photo of the S-Coupe Turbo`s stock Garrett T15 turbocharger which clearly shows it`s manifold mounting flange :-
My Webpage

Cheers,
Nick.

If you have any mk1 engine/swap/Mitsubishi questions I will try to answer them to the best of my ability as I have owned many mitsu/CSM cars. This is all USA info as it would take forever to compile lists of all possible world combos, but except for the years it may appy to other countries. I might omit any engines deemed unimportant such as carbed or lesser engines that would downgrade/not apply to our specific cars. Also if you have questions about your specific country I can help.

some interesting info:
1.5 litre 8v G4DJ 90-92 Scoupe =4g15
81hp 91ftlbs
1.5 litre 8v G4DJ 90-94 Excel =4g15
81hp 91ftbls
1.6 litre 16v G4CR 92-95 Elantra =4g61
105-113hp 102ftlbs
1.8 litre 16v G4CN 93-95 Elantra =4g67
124hp 116ftlbs
2.0 litre 16v G4CP 92-95 Sonata =4g63
128hp 121ftlbs
2.4 litre 8v G4CS 89-91 Sonata =4g64
116hp 142ftlbs
3.0 litre 12v G6AT 89-93 Sonata = 6g72
142hp 158ftlbs

Remember Mitsu didn't build these motors Hyundai just bought blue prints from Mitsu. There are suttle changes in the blocks so assume nothing.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Engine designations:
for example 4g15 means
4=4cyl
g=gas
1=series of engine
5=number in which the engine was invented/added to mitsu's designation

so the the 15 is a fluke it doesn't mean 1.5 litres . because a 4g63 is 2.0 not 6.3 litres. a 6g75 would be a 6cyl. The series can also be a help as a 4g63 dohc turbo and head will fit on a 4g64 dohc block to make a 2.4 litre stroker.

Mitsu built cars:
89-92 1.5 litre colts/summit/mirage's came with 4g15's they came in 8 and 12v flavors (93-on have the engine on the opposite side, and 89 and before have carbed engines)ECU's are Interchangeable with all 4g15 cars.
81hp91ftlbs ->8v, 92hp93ftlbs->12v

89-92 1.6 litre colts/summit/mirage's come with a 4g61 dohc (it is n/a except for the rare 1.6 turbo 89 colt/mirage gt)
123hp101ftlbs->non turbo 135-145hp->turbo

91-99 3000GT/Stealth's all came with 3.0l 6g72's in 12vsohc/24vdohc/24vdohc turbo flavor's.
161hp185ftlbs->12v, 218-222hp201-205ftlbs->24v, 300-320hp307-315ftlbs-> 24v turbo.

90-94 2.0litre Eclipse's/Talons/Lasers came with a4g63 turbo 16v or a non turbo 16v
135hp125ftlbs->16v nonturbo, 180-195hp203ftlbs->turbo

90-94 1.8litre Eclipse's/Talons/Lasers came with a 4g37(aka g37) 8v which shares about 45% of parts with the 4g15(the engines are almost electrically identical) and you can swap ecu's, throttle body (don't remember what year), MAF and injectors for more power. it is not of the same generation so head/cam/block swapping is impossible. If this engine is swapped in, you can take a turbo from a 85-89 turbo g32b 1.6 colt/mirage and have a 8 valve sleeper.
92hp105ftlbs

1992-1995 Expo/Vista/Summit Wagon Van's came with 1.8 8v 4g67 and 2.4 4g64 1.8 8v. These cars also have similar electrical systems to the 4g15 as the ecu plugs right in. But I have not explored this avenue due to lack of time.
113hp116ftlbs->8v 1.8, 116-136hp136-145ftlbs->8v 2.4

1990-1993 Galant came with the 2.0 litre 4g63 in 8v/16v/16v turbo flavor's. The 4g63 Sohc 8v is similar electricaly to the 4g15, but again I haven't had the time to play around with this combo.
102-121hp116-120ftlbs->8v, 135-144hp125-134ftlbs->16v, 195hp203ftlbs->16vturbo

1994 Galant GS came with the ultra rare 4g64 2.4 litre 16v dohc engine putting the 8v version of the 2.4 litre engine to shame. This engine weighs only a little more than the 4g63 so is a powerful upgrade.
160hp160ftlbs

playing around with the 92-95 Hyundai Elantra motor mounts(1.8&1.6) and stock mounts will yeild results. The mounts you need are: the top L-shaped mount, the front engine bracket, as well as the rear, the crossmember that goes from the front of car to the back or middle of car. Also need the dsm transmission bracket( not the rubber mount) if swapping tranny. If not swapping tranny make sure to get an eclipse non turbo flywheel/clutch/pressure plate combo. I do believe the mounts from a 1.6 turbo 85-88 will mount a 4g37 engine which is theoretically a drop in swap....theoretically.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


Any suggestions welcome!

Many people do not realise that Hyundai U.S.A. have provided a free online Workshop Manual for all the Hyundai models that are sold in America.

To use this click :-
http://www.hmaservice.com/authenticator/lo...h%2Fdefault.asp
Go to Service Information, enter your car`s details & click the `Shop` tab.

N.B. this site only works if you use Internet Explorer!.

It might be an idea to bookmark this to your favourites........& remember you can print off sections (or the whole manual!) as required.

Cheers,
Nick.

UPDATE!

You now have to register to access Webtech.
Enter your details on the site & you will be sent a password within 24 hours by email.
Once you have done this & are on the Home page, you get to Webtech by clicking `Service Information` at the top of the navigation bar........then proceed as above.

Hey guyz i need some parts to get the s-coupe rego'd :/, anyone with a drivers side tail light, front grill, and the interior door handles and front speaker covers who wants to sell them please pm me i kinda need them soon. cheers

Hey all my Scoupe turbo has been parked for 2 weeks now. i cant get it to spark. To day the Megasquirt guru was at my place and he says the crank angle sensor is unable to count the teeth? thats why the ecu can not give off a spark/ is not able to start/starting.

So after my initial engine rebuild the car was sent home cos it would not start. So i tested the crank angle sensor and it did not show continewity or give off a resistance= sensor is fucked right? so i pull out the sensor and notice a dent in the crank angle sensor. So i get a Replica of a accent it fits perfect. gives a resistance value and show continewity. but still the car cant fire.

So the megasquirt guy test the ecu and All the wiring and says the Crank sensor is not giving the signal. so eithe the flywheel is not alined. teeth are bent or there are teeeth missing. so i phone hyundai and ask them WTF is going on and they say the scoupe flywheel can only bolt on one way and doesnt need to be alined.

so they are sending someone out tommorow on a sunday but i dont know what they are going to check. all i can think is they will bring a coil pack and a crank angle sensor with. but all Hyundai crank angle sensors must be 60-2 as a accent 1500 also has 60-2.( and thats a entry level hyundai) So its logical a 16/18/2000cc will also have a 60-2 and either ay a 60-2 is a 60-2.

How do i sove any suggestions?

hey all
the other day i purchased a 1993 scoupe turbo as a project car
i have been trying for days now to get it runing but it just wont start
it runs but it sort of chugs with no power at all not exceeding 1000rmp on 1 cylinder
but after about 5 mins of trying to start it, eventualy it does run
what could be the problem ? ?

how do i get rid of fuel cut on a 95 scoupe turbo
i know i know
if i don add fuel i wil break my motor

i will be adding fuel via additional fuel injectors controledby a split second module
can someone help please

Hey guys,
Just recently picked up a parts car for fixing up my interior and the engine was still in good nick.
It has around 170 000kms on the clock.
Looking for offers. Postage would not be included in the price though I can get a calculation to where you live and whatnot.
Give us a shout if your interested.
Cheers,
Rednut

Hello all.. Im new to h-f.com. Only found this site last night and have spent a few hours going through a lot of the topics. Im really impressed not only by the technical savvy of some you out there but also the good natured way in which everyone communicates here.

I own a 91 scoupe gls n/a. I bought it to teach my wife to drive because it seemed like a good car for her to learn on and was reasonably priced.
Havent had to many problems with it, which is a blessing because Im not the most mechanically adept person around!

I had a few problems early on but that was more through previous owner(s)? neglect more than anything else. Its quite straight on one side but has a couple of small dents on the left hand side. Ive had a new alternator put in , changed the spark plugs , oil and filter and it seems to be running as good as can be expected.

I do have one question. Id like to fit what we call in Australia a "pod" filter (I believe its called a ram intake or something like that overseas). The only thing Im unsure of is the what I think is the air flow sensor (bear with me ...told ya I wasnt very mechanical) I have included a photo I found in another post, hope Im not breaking any rules. Id just like to know if the way this persons pod filter and air flow sensor are set up correctly? So if I just copy this persons set up I should be sweet ?

The first photo is not my car.. the following photos are of my car....


Any help would be great. I dont plan on doing much with this car. Maybe some new rims and try to fix the left hand side panels and of course the pod filter. Thanks for taking time to read.....

Hey guys im pretty much still on stock suspension?

What is available for my car? Shocks and Springs?

any body after any parts? small parts can be posted abroad

Title says it all, any ideas on what it could be or what i could do to get it going.

cheers

ok i understand this is possibly the most simple question for you guys to answer but im stuck,

just bought a 1996 Scoupe Turbo SE, firstly i can not beleive this car only has 115bhp!!! but ill cut to the chase.....

which dump valve do i buy??? brand, model ?!?! i cant seem to work out which will fit and also what will i need to buy to fit it?

cheers

Hi all,

this is my first coupe and first post......... so be gentle

i am wantin to replace the gearknob for a nice shiny new one but before I jump in, i thought it would be a good idea to ask if anyone has already done this in case I hit any problems.

does it simply twist off or is there more to it ?

thanks


hyundai coupe-s late 2002 model (new shape)

i might buy a scoupe this guy i know has one for $150 it runs and drives barely i just need advice on if i should buy it or not

Hi,

i want to change my steering box because my actual box has got too much clearance. I'm looking for a non-power assisted steering box because i want to take out all the parts of the power steering system. At the moment, i'm running the car without the belt for the power steering pump.
In Germany, it's hard to find a non-power assisted steering box for the Scoupe. Did the Scoupe come without power steering? I'm planning to install a steering box from a Pony, Accent or Lantra (or something like that) because the boxes look very similar (just without the hoses for the hydraulic oil).

Do you guys know if any steering box fits into the Scoupe? It could be that the track width vary but hopefully i just can change the tie rods...

I hope someone can help me!

Many thanks!


Cheers,
Martin

Hey huyndai fans.

I have, like you, bourt a S-coupe GT. I love the car so I'm going to try to rebuilt the engien + adding some new improvments

I have all ready been at it for a little while, but now i'm stuck.... I think the the previos owner have been driving way to fast for to long and then the oile tempeture have gotten to high (btw. i have seen on the forum some guy saying that the oile temp on the GT are normaly pretty low.. NOT!! the oli temp gets EXTREMLY high on this engien just by doing 120-135 km/h on the freeway). So i have these 2 questions that i need expert help with!


1: What is the engine name on my S-coupe GT?? I think it's G4EK.. is that right??

2: How do i rebuilt the cylinder head?? Well to be a little more accurate i need to know if any one have tryied to change the valve stem bearings?? I've opende up the engien and guess what.. the valve stem bearings are all messed up!! They seem to be a part of the cylinder head aka. a part i can't change Can i cut/grind the originals out and maybe get spare parts from a mitsu' colt or something?? Or do i need a new head and where to i buy one??

I've found this site: http://www.cylinder-heads.com/details.cfm?itemid=2042 But on that site the engien number/name is all worng compaierd to what i think it is... Do you guys think it can fit??

How can i rebuilt it?? Any sujestions are welcome!!

PS. sry about my crappy english but i'm trying

So i have driven the new engine 1000km with the Bigger injectors Mapped to .7 bar

and after all the pain & suffering, time and Money the scoupe makes its first dyno appearance...



Well here is the Scoupe Boosting a Colossal .7 bar.

1st run is with the water injection on(175cc Jet,H20 Only)
2nd run a disconnected it cos i could feel the Water was coming on too early....



The next mapping will take the car upto 1.2/3 bar pump gas. thinking of enjoying the car before taking it high boost/running high risk/blow the motor...(There just isnt time or money for that...)

So far this Fresh motor with worked cylinder head is making +-15-20kw MORE than i expected.. so the future looks promising...

i took out my screen from the mass air flow sensor and had lost it.

im looking for some new floor mats for my 02 coupe. I've found some mats here www.mycarmats.co.uk but ive never dealt with them before. Anyone know them?

Also does anyone know where I can get some genuine mats without paying main dealer prices?

ok im goin with mega sq
i know u guys have done it...

besides the ecu was there anything else needed for it to work'

car details
95 scoupe turbo

stock internals
t3 turbo
custom manifold
rx7 turbo 2 injectors 550cc
front mount intercooler
4 puck unsprung bronze clutch
95 accent intake manifold

hey guys, im fairly new on here, i got myself a hyundai scoupe mvti se, the front shock absorber is leaking and needs to be replaced so figured why not lower the car, from what i understand i need new springs and shocks but cannot find shocks anywhere? is there a limit on how much i can lower on standard shocks and also any ideas on anything suspension wise that will fit on this car, im needing to get this done asap, any help would really be appreciated thanx guys

has anyone installed a Microtech ltx8s stand alone ecu?into the 95 scoupe turbo??

g'day all i own a 93 non turbo scoupe and latley i have noticed that my car has started ticking really loudly from the left hand side of the car while turing and i have no iea what it could be.
any help people could give would be appreciated as i want to fix this as much as i can in my backyard.

cheers

some ppl are telling me that you get a nice sound and more performance when you use panty hose as a filter.. is that true?

Hello, I have a 1996 Accent GLS with a Turbo S-Coupe engine I just had put in. I am not sure of the year but I know when I bought it, it came with oversized .20 pistons and a competition clutch. Does anyone know if these engines have a problem with heads? Like cracking them or anything? I am getting a whole lot of white/blue smoke coming from cylinder 4 only. More than one mechanic did a compression test, another took out the rings, checked them set them again (these are brand new rings) but the rings appeared to be fine and the compression read at the required level. Still lots of oil only on cylinder 4. Checked valve seals, changed them, same thing. Funny thing is, I have 2 blocks, one which had original size low comp. pistons and the other with the .20 pistons and I also have TWO heads. BOTH blocks and heads with the same problem on cylinder 4, excess oil and its CLOUDS of smoke. Does anyone have any idea what could be goin on here?

time for a tune up. what kind of plug and plug wires should i get for my scoupe. engine = 1.5 4cyl 1495cc n/a

i have a little bit of smoke coming from the bottom of my transaxle.. engine is an alpha 1.

I have a 93 scoupe 1.5 non turbo, when driving the car around 3500 rpm or 65 mph it starts to cut out but when I press the gas pedal all the way to the floor its fine or if I let off the pedal it stops and also sometimes when I drive the car some where and park I come back to the car it wont start, when I try to start it, it seems to flood you can smell gas and if I wait 15-20 mins it will start but you have to wait. any suggestions on what might be the problem will be appreciated

Hi,

I have been having some massive trouble with my scoupe.

No spark is going to the plugs, I have checked everything: Plug leads, Coil, Dist. Cap, Plugs, e.t.c and still no spark.

I dont even if this car has points in it or not, but someone has told me that it might be the camshaft (or crankshaft??) position sensor.

Could any of you guys tell me where it is located on my scoupe?

It is a mark 1 1991 1.5 GLSi

Thanks Guys!

- Aaron :-)

Hyundai s coupe coilovers now were talking suspension for the s coupe. Ive fitted them to my scoupe turbo wow[size="3"][/size] what massave difference.

Hi Guys,

I'm in the process of re-doing/fixing my car and want to know what size the FRONT ANIT-ROLL BAR SUSPENSION BUSHES are.

I've been told by the company supplying uprated bushes that they are either 16mm or 18mm in size. This could mean the thickness of the bar or how wide the bushes are.

If anyone can help I will be eternally greatful.

Thans.

FYI the bushes come from the below company and are £140 for the whole set.

http://203.31.191.243/fulcrumCat/

hi there i live in canada and am a Technition at hyundai in my town i have a scoupe with a blow t15 and cannot be rebuilt so i am trying to get a t2 series ex nissan or stock garrett flange turbo , i just wanted to know what exact year of turbo i need or what car these turbos come off of ? thanks alot hope you can help me

hey guys, having another problem, my clutch slave cylinder is leaking heavily and i cannot find a replacement anywhere, i live in UK, any ideas? cheers guys

I started working on my 92 Scoupe again which it needs the engine assembled but now i don't know what the oil screen bolts are for my engine can anybody tell me anything about the bolts and i also need to find all the bolts that bolt onto the oil pump. So if you can help ill appreciate it

Hi!

I have a scoupe GT 1995 and i crashed my headlamp (RH). I was searching a new spare but the OEM numbers are diferents between my local dealer and USA dealers (9210223221 - Colomiba and 9210223251-USA)


I found a headlamp on ebay (USA), the size are a little diferent (about 1cm in each size) and the OEM number too but i can't believe that exist diferents scoupe body's for the same model (1995).

Is it possible that the USA scoupe models have a diferent body (headlamp) that mine (i am in Colombia) ??


Can I buy the USA headlamp ?

hey guys i have a 94 hyundia scoupe. right now its with out an engine and i was wanting to get it back up. but i would like to find something that has some power too. trying to stay away from v-6's so any 4 cylinder ideas would be helpful?

I'm having trouble with my 92 scoupe. Basically the car will start if I spray starting fluid into the throttle body. After that, the car dies. The Fuel pump is working the fuel filter is new and the fuel is getting to the fuel rail. Could my problem be the fuel pressure regulator? Would that prevent the car from running?

Also....Although I'm not getting a check engine light, I am getting a trouble code for the O2 sensor. I know that would'nt keep the car from running at all. Any ideas?? anyone???

hi can anyone tell me if they put an aftermarket ignition coil on there scoupe. and will a msd blaster 2 be alright to use for a 93 scoupe 1495cc 1.5L n/a engine.

I've lost my old pass word, reregistered, gone down the forgotten password line. No emails have been sentto me yet, I realy need it asap to get it out of my girlfriends parents garage. Could any kind soul send me a copy of the .pdf manual

my email is rich.goodwin@hotmail.com

Hi Guys,

Selling my SCoupe:

http://www.hyundai-forums.com/t36148-fs-hy...-mvti-turbo.htm

Cheers

Hi guys,

I am trying to get hold of a plastic dash surround for my s coupe. The part which surrounds the radio, hazard switch etc.

If anyone has one please can you let me know as I need it asap.

I have enquired about all the ones on ebay but with no success.

Thanks.

hi, i have a scoupe 95 LS which i have turboed, standard n/a engine running an piggyback ecu. she runs well but the gear box needs to be reconditioned i was thinking is it Possible to take the gear box from a 93 scoupe turbo and install it into my 95 scoupe Ls (turbo). has anyone done a install like this and are the knowen problems for an installation like this. see the gearbox out of the wrecked 93 turbo is in better condition then my daily driver. . and i want to know what options i have and how much trouble its going to be.

Hello there.

I have run a search for "Central Locking" and couldnt find much for the S-Coupe so here it is:

1) My Central locking has failed in the last month. It will lock the car fine but it wont open the car. (I have to use the key, I dont have a remote key fob). I now have to unlock the passenger side manually. Yet when I get out and push the drivers side lock down, it locks both doors.

I've taken the door cards of and I think the mechanism may have been aftermarket as my car has the rear spoiler-reflector. (Mainly found in UK models). However I not 100% so any advice is MORE THAN WELCOME.

2) Has anyone come across any other mods recently, I remeber hunting down suspsension in recent forums (might be worth making that a sticky topic "Mods in General")

3) ANy one here speak Korean? there is a site bobae-dream.co.kr (look it up on youtube.com) which host and S-Coupe club site. But I cannot read it, even when translated by google cos you have to register.

4) Tell me somehting you love about your S-Coupe (see my PS below for why I'm asking).
I'll start: The Back end, looks so old school and jap.

Cheers.

PS - Sorry I haven't posted for a while, I've been having a few car problems and I am trying so hard to still like my car! (You all know what I mean!)

Hi ppl

What are the symptoms of the limp mode???

And how can be removed or desactivated???

Thks

Hi there. I have a 1994 Hyundai Scoupe 1.5l, which I gave an oil change about a week ago. After the oil change, the car was hesitant to start, and when it did an odd "pop" noise came from the engine bay. I kind of disregarded it and decided to go into town. All was well until I ascended the hill outside my driveway, on which my car decided to jerk violently. The second I apply more than the smallest bit of gas, it goes crazy. It's undrivable. It's fine(for the most part) on flat ground/downhill, but I cannot drive it uphills, it surges way too hard. I thought it might have been related to my bad CV joint, which I replaced today, to no avail. I tried unplugging the EGR, on which the car was more responsive, but the violent surging remained. So now I'm kind of clueless, and would greatly appreciate any help!
Thanks a ton!

I just bought a 91 Scoupe, with 60k miles on it.

There seems to be a bit of a shifting problem.

When I go to slow down, the car jerks violently, like it has trouble downshifting

Not only that, when I go to let off the gas , the car jerks as well

Just the other day, I got stuck going 20 MPH , the car just wasnt shifting up

What could be the source of the problem?

I was told it was a transmission solenoid

any help appreciated!

please help me

bought my first coupe and i love it but when i try to put the overdrive on the engine shifts into neutral and wont go back into gear until i turn off the overdrive. wonder if anyone knows what the prob is please help me

ta xx