i was gonna say 5-6 psi? and double up head gaskets for lower compression was what i was thinking






:whistling:

There was a thread about it a while back and I think 5-6 was about right.

Weld your head, no gaskets. :grin:

oh really? i didnt know there was a thread...sorry:S

and welding my head is a effing GREAT idea!! LMFAO!!!!! who needs gaskets?? lol jk

It may not have been a thread per se, it may have been an off-topic conversation in a thread. IDK, it was a while ago.

I guarantee to you if you double up head gaskets you'll be going through them like M&M's... If you wanted to lower compression, install dished pistons

Seoulful Racing have headgasket thatll lower the G4ED compression.

Gonna charge it?! Turbo or Super?

well i couldnt find a supercharger...no one makes them do they??...so im piecing out my own kit instead of paying a million bucks for a kit...the stock exhaust manifold is perfect for a turbo manifold...cut the cat. converter, weld on a big ol' flange that matches the turbo's flange and use exhaust piping for the boost pipes, use a volvo intercooler, make some vacuum lines, oil line, cheapo depot vacuum gauge..the list goes on...

..i know what im doing so dont worry..this is the first turbo car ive had and worked on :)

i can go to the volvo specialist that i used to take my 740 to and buy all that stuff for UBER cheap :D...once the money starts flowing, im goin for it :D...ill skip off from getting rims..winters coming and buyin rims now is pointless LOL so ill build up the kit over the winter :)

im gonna use a Garret T3 turbo that used to come on Volvo 740 TI's....i had one fo these and those turbos are effing awesome for a factory part haha..plus they are easy to install and dont have awkward sized flanges like Mitsubishi turbos :)

Dont bother with two head gaskets. One will be fine for that pressure. lowering compression will just decrease power. Its all in the tuning.

yeah ive been thinking about that as well..glad someone sees both sides lol

Using a thicker head gasket will lower your mechanical compression,but being turbocharged will raise your static(effective) compression.
For example if 5-6 lbs boost raises your compression by 25%,then for every 10lbs compression you lose using the thicker head gasket,you will gain 12.5 lbs due to turbo charging.
That is why some turbo charged cars run as little as 7 to 1 compression.It allows more room for compressed A/F mixture.
Normally the volumetric efficiency is around 75-80 % on a n/a engine,while in a F/I engine is can easily reach 105%.
More bang for the buck.Also it will use a lil more gas,than if left as is.
Looking foward to seeing the results :beer:

Higher compression = more power. But also more heat. Will need to run higher octane fuel but like I said, its all in the tune.

Reason for lower compression is it keeps heat down and allows you to run higher boost safer. But for those numbers the boost amount will hardly make up for the lower compression power wise.

What else do you have planned for your setup?

you mean like..BOV, wastegate, turbo......??????

7:1 compression on a 1.6 litre? how would he even get the car off the line.
You have to find a happy medium between off and on boost power. YOu cant stay in boost all the time.

Hey fieryaccent, I understand working with what you got, but do you have any power goals in mind?
If you knew the HP number you want to hit, you would be able to size your turbo appropriately, thereby allowing you to size your fuel system appropriately, thereby allowing you to choose your fuel managment etc...

you can see where this is going.
not sure how into this you are going to get, but since you seem like you want to get into home brew tuning, the buick grand national website has a ton of info. alot of it applies to any car.

http://www.gnttype.org/techarea/turbo/turbopage.html
i really like this link for learning how to size a turbo
http://www.gnttype.org/techarea/turbo/turboflow.html

This post has been edited by fonque: Oct 10 2008, 10:58 AM

I mean what are you going to use to fuel tune mostly.

well im shooting for NO MORE than 200bhp....just something i can wipe out my friends heavy 07 Golf GTi with..i should not nee more than 200hp to the crank...i know what turbo im gonna use..ive worked with it before on another car i had and it was great..boost at higher RPM's so that i wasnt on fuel sucking boost when i was driving normal in town...its a good size for my car so...im praying the 5PSI wont lean out the stock map tune ...if it does ill take it to the city and remap it :)


also ppl...im building up the kit over the fall and winter...no sense in having butt loads of power on ice and snow, unless were were taking about a Subaru WRX lol....that way i can look into more research and plan out everything carefully :D

You will lean it out at that boost most likely. If nothing else get a FPR and raise the pressure a little bit. A wideband will be a nice thing to have to keep an eye on the AFR.