i usualy start on second when the floor is wet so that it doesnt peel out. but does starting in second save gas, since i can skip that short first tahts redlining @ 15?
alfu
Lol, well you'll save gas compared to redlining it in first gear, but I think the added gas you have to give to get going won't help you.
I think I read somewhere optimal shift points are at
1-2 = 15 mph
2-3 = 25 mph
3-4 = 35mph
4-5 = 45 mph
Off topic, if (Torque x Engine speed) / 5,252 = Horsepower
why is 226x3500 / 5252 = 150.61 ??? Im guessing that is hp at the given rpm?
But if 226 is the peak torque and if it does not falter all the way to red line.
226x6000 / 5252 = 258.2 !!!!! What is this blasphemy!
I think I read somewhere optimal shift points are at
1-2 = 15 mph
2-3 = 25 mph
3-4 = 35mph
4-5 = 45 mph
Off topic, if (Torque x Engine speed) / 5,252 = Horsepower
why is 226x3500 / 5252 = 150.61 ??? Im guessing that is hp at the given rpm?
But if 226 is the peak torque and if it does not falter all the way to red line.
226x6000 / 5252 = 258.2 !!!!! What is this blasphemy!
ive notice taht in the sonata v6 wen in manual mode u can shift:
2 @ 0
3 @ 15
4 @ 25
5 @ 40
(i know these arent the optimal shifting points, but i do it when driving slow)
and another question when racing shud i shift at around 3,500-4000 since tahts wer the car has the peak torque?
2 @ 0
3 @ 15
4 @ 25
5 @ 40
(i know these arent the optimal shifting points, but i do it when driving slow)
and another question when racing shud i shift at around 3,500-4000 since tahts wer the car has the peak torque?
Agreed. To save gas make sure the car is in the highest gear as soon as possible.
Actually, in manual, you can shift at 2000rpm which helps gas some. Its enough power to shift up and not too much.
As far as racing goes, just ask me. lol.
I ALWAYS make sure to shift near redline so that there is maximum power transfer while racing. Even if you dont shift, right before it redlines it will shift up.
I hope you also knew that when in shifttronic the brake doubles as a clutch. If you softly depress the brake alittle bit while driving it allows you to down shift smoothly without tranny lag or tranny braking. :clap:
Makes racing easier :beer:
Actually, in manual, you can shift at 2000rpm which helps gas some. Its enough power to shift up and not too much.
As far as racing goes, just ask me. lol.
I ALWAYS make sure to shift near redline so that there is maximum power transfer while racing. Even if you dont shift, right before it redlines it will shift up.
I hope you also knew that when in shifttronic the brake doubles as a clutch. If you softly depress the brake alittle bit while driving it allows you to down shift smoothly without tranny lag or tranny braking. :clap:
Makes racing easier :beer:
Disclaimer: My opinion is based off the Tiburon 4-speed auto, not the Sonata 5-speed auto.
The Sonata may act the same way but I've found that my '04 Tib actually will shift quicker in standard Drive mode than it does if you allow it to shift itself in Shiftronic mode. What happens is as it approaches redline, it actually pauses for a split second waiting for you to manually shift but if you leave it in drive, it shifts quicker right at the redline when the throttle is wide open.
One trick auto Tib owners do to speed up the shifts in Shiftronic mode is to let off the gas slightly just as the RPM reaches redline and then floor it quickly. The trans senses the slight lift in the throttle and thinks you are finished accelerating so it upshifts to the next gear.
The Sonata may act the same way but I've found that my '04 Tib actually will shift quicker in standard Drive mode than it does if you allow it to shift itself in Shiftronic mode. What happens is as it approaches redline, it actually pauses for a split second waiting for you to manually shift but if you leave it in drive, it shifts quicker right at the redline when the throttle is wide open.
One trick auto Tib owners do to speed up the shifts in Shiftronic mode is to let off the gas slightly just as the RPM reaches redline and then floor it quickly. The trans senses the slight lift in the throttle and thinks you are finished accelerating so it upshifts to the next gear.
These numbers make sense. At 3,500 rpms, under full throttle, the 3.3 produces 150 hp. Sadly, torque decreases as rpms increase. If the 3.3 produces 234 hp at 6,000 rpms, it means it is producing 204 lb-ft of torque at the same rpm. That is clearly less than the peak torque that occurs at 3,500 rpms.
Please note that when it comes to everyday driving, this formula has very little value. The numbers quoted from this formula only apply to engines under full throttle. If you drive at ¼ to ½ throttle, the engine produces much less torque. Unless you know how much torque the engine produces at ¼ throttle at 2,500 rpm, you cannot calculate horsepower for ¼ throttle at 2,500 rpm.
With regard to gas mileage, I think the answer depends on how much throttle you use. If you need to hold the clutch for three seconds at 1/3 throttle to come off the line smoothly in second gear, but only need to hold the clutch for two seconds at ¼ throttle to come off the line smoothly in first gear, you may get better mileage using first gear. It may not be a big difference, but using first gear is certainly easier on your clutch.
Hmmmmm. Sorry about that. And I do know that the mighty 3.3 does not come with a stick. Thanks.
Technically speaking, auto transmissions do have clutch packs, although if you abuse an auto it is generally the transmission fluid that will fail first. Gradually as the fluid becomes less and less effective the load will fall on the clutch packs, which will degrade quickly without the assistance and cooling of the transmission fluid.
But yeah... starting off gently in first gear will probably be more fuel efficient than second gear, but why not track it for a month and find out?
They should make a version that gives Sonata V6 a 6 speed like the tib, hey Honda did it for the Accord :gitara:
Starting in 2nd could possibly save you a little gas IF you are very light on the accelerator pedal, and IF you are not going up hill, and IF your car is not loaded down. Generally speaking, I doubt it would be worth it.
Not to sound like a know-it-all but I think your logic is a bit faulty. Your mileage in first and second will always be dreadful, absolutely dreadful, especially with a cold engine. Starting in second means you accelerate even slower and have to press harder on the gas to accelerate at the same rate. And just accelerating slower won't help.
Accelerating really slowly just keeps your fuel efficiency much lower for far longer. Your mileage tends to be pretty bad until you get into top gear.
Starting in second is really about minimizing rear wheel torque for starting under low traction conditions.
Generally speaking, starting in second is reserved for slippery surfaces to reduce wheel spin on start up. Letting the engine run through its normal acceleration starting in first would make more sense as the system is programmed for best efficiency doing that. The transmission is designed to shift at the most efficient points so starting in second will only slow you down and may cause safety issues if you find that you need to accelerate rapidly to avoid an idiot in traffic.
I would think that any fuel savings would be minimal... better to use high quality synthetic oil, keep the tires inflated to proper pressure, use a light foot and simply be conscious of fuel usage.
Ray
I would think that any fuel savings would be minimal... better to use high quality synthetic oil, keep the tires inflated to proper pressure, use a light foot and simply be conscious of fuel usage.
Ray
Like most performance engines, the 3.3 ltr. engine is designed to produce most of its torque in the mid and upper rpms, not the lower. That means it burns it’s fuel least efficiently in the low rpms. Low efficiency translates to bad gas mileage. Because starting in second gear forces the engine to spend more time in the low rpms, particularly under load, it will probably get worse mileage than if you let the car start in first gear, which lets the engine rev and get out of that of the inefficient area of the torque curve quickly.
Well, that's not the first time my logic has come into question, and it won't be the last. That's because I refuse to split hairs, and calculate my mileage to 3 decimal places. As long as it's not a life and death matter, close has always been good enough for me. I stand by my logic that it can sometimes be useful to start off in 2nd gear. I also stand by my logic that it's not normally a practical thing to do. I'll leave it up to you.
Look up "hypermiling" or "extreme fuel economy".
There are a bunch of uh, nuts, that go to extremes to wring out every last .01 mpg from their cars. They pursue the ultimate MPG not so much to save money or save the planet, but an an end in itself. These people forgot more about traction and mileage tricks than we will ever know, or even want to know.
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