Best shift point?
Apr 29, 2008, 11:45 AM
#17
This is all terrible advice. A well running stock turbo will make max power right at 6900 give or take 100rpm. Its impossible to tell without seeing the sheet but in general shift first gear at like 7600-7800 and the rest at like 7400-7500.
You should wind out first gear longer than the others and if you shift at 7k or lower, you're going slower. Period.
You should wind out first gear longer than the others and if you shift at 7k or lower, you're going slower. Period.
Good advice Justin, I also agree with him based on my own experiences.
Apr 29, 2008, 11:50 AM
#18
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Dyno your car. Ask them for a plot of wheel torque in each gear (like first to redline, second to redline etc). If the graphs cross, then that's your shift point, if not, shift at redline.
Apr 29, 2008, 02:46 PM
#19
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Most of these posts deal with peak horsepower which is not the point. Whether or not the car is creating less power after 7,000 RPM is not important. You should shift at an RPM that drops the engine to the torque peak upon release of the clutch in the next higher gear. Look at your dyno pull and work backwards from the peak torque.
Apr 29, 2008, 03:26 PM
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Most of these posts deal with peak horsepower which is not the point. Whether or not the car is creating less power after 7,000 RPM is not important. You should shift at an RPM that drops the engine to the torque peak upon release of the clutch in the next higher gear. Look at your dyno pull and work backwards from the peak torque.
If you check or calculate wheel torque vs speed from a dyno plot, if/when the lines cross, those are your shift points. If they don't cross, shift at redline.
Apr 29, 2008, 04:27 PM
#24
Evolved Member
I shift at 6500 on my race gas map, as you can see the turbo doesn't hold for s%!t up above that... now on my pump gas map, it is nice and flat with good HP at 7000
Apr 29, 2008, 04:32 PM
#25
You would be faster shifting around 7400. Notice how the trq drops off... also..
If you go from 7800 back 2000 rpms youre right after that big hump of hp. If you shift a little earlier getting back on the gas youll be right at your peak power with more trq to keep you flying =-)
Cheers!
Apr 29, 2008, 04:34 PM
#26
Hey guys the other day i was taking to a fellow evo owner and he was giving me some advice saying i should shift at 7100 instead of 7500 with the mods i have. I was a little confused because since my tune allows me to shift at 7500 i would think it was better. What do you guys think would be a optimal shift point for stock turbo evo? Thanks
7100-7200 would be the optimal time to shift your car based on your mods, assuming its matchs up with most cars with your same exact mods.
Cheers!
Apr 29, 2008, 04:57 PM
#27
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You would be faster shifting around 7400. Notice how the trq drops off... also..
If you go from 7800 back 2000 rpms youre right after that big hump of hp. If you shift a little earlier getting back on the gas youll be right at your peak power with more trq to keep you flying =-)
Cheers!
If you go from 7800 back 2000 rpms youre right after that big hump of hp. If you shift a little earlier getting back on the gas youll be right at your peak power with more trq to keep you flying =-)
Cheers!
Apr 29, 2008, 07:38 PM
#29
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It's torque at the wheels that accelerates the car. When you shift, you change the gear ratio and so a given amount of engine torque results in less torque at the wheels. So its a balance between engine torque dropping at higher revs and wheel torque dropping due to shifting to a higher gear. Given torque curves and knowing the gear ratios, you can calculate for yourself where the best shift point is.