tuning power and torque

[Brodyj]

I was wondering what you thought about torque and power tuning. The first
iteration of the intake and the exhaust is roughly tuned with in maybe 3%. The
torque peak is very flat from 5500 to 9500 rpm with a change in torque less
than 4 ft-lb. The power peaks out at 9000 rpm at 61 HP. I want to know if
these are good torque and power curves or should I tune to focus torque at an
rpm band that that is narrower to maximize power for our formula car?

I know flat torque curves are desirable on the road and for a drivable formula
car, but is a 4000 rpm wide band excessive? The largest difference in gears is
first to second and the rpm difference is 850 rpm, I think? Is it safe to
assume that most drivers can keep the engine speed within 2000 rpms of max
power? If so, then we should focus our exhaust and intake tuning around a 2000
rpm band in order to make more power, right?. And where should we focus this
tuning? Right before the current peak in power at 9000? This would insure
that at lower revs coming out of a corner torque would be at its peek to
accelerate you out of the corner? Right? Please offer your opinion and
enlighten me.

Thanks

[Brodyj]

I was wondering what you thought about torque and power tuning. The first
iteration of the intake and the exhaust is roughly tuned with in maybe 3%. The
torque peak is very flat from 5500 to 9500 rpm with a change in torque less
than 4 ft-lb. The power peaks out at 9000 rpm at 61 HP. I want to know if
these are good torque and power curves or should I tune to focus torque at an
rpm band that that is narrower to maximize power for our formula car?

I know flat torque curves are desirable on the road and for a drivable formula
car, but is a 4000 rpm wide band excessive? The largest difference in gears is
first to second and the rpm difference is 850 rpm, I think? Is it safe to
assume that most drivers can keep the engine speed within 2000 rpms of max
power? If so, then we should focus our exhaust and intake tuning around a 2000
rpm band in order to make more power, right?. And where should we focus this
tuning? Right before the current peak in power at 9000? This would insure
that at lower revs coming out of a corner torque would be at its peek to
accelerate you out of the corner? Right? Please offer your opinion and
enlighten me.

Thanks

[Brodyj]

Read me. I dont want to be missed.

[Charlie]

I don't think 4000 RPM is excessive at all. I think you ought to have power everywhere http://fsae.com/groupee_common/emoticons/icon_smile.gif Drivers are morons. http://fsae.com/groupee_common/emoticons/icon_wink.gif

What engine are you using?

-Charlie Ping

I just need enough to tide me over until I need more.

[Dan Deussen @ Weber Motor]

Can u post a HP-TP vs. RPM chart? Your overall HP number appears a little low. What kind/year engine are you running?

I don't think your 850rpm drop for a shift is right. A 1-2 shift drop should be more in the 3000 to 4000rpm range.

Daniel Deussen
www.walbro-italy.com (http://www.walbro-italy.com)

[Brodyj]

I cant post the chart because I dont know how,Dan. Charlie, you are right, a shift at 10000 from 1st to 2nd is 3000rpm. We are running a ZX6R. Why does the power sound low?

[ReadySetGo]

sounds like us http://fsae.com/groupee_common/emoticons/icon_smile.gif. zx6r. have you guys done intake manifold calcs? our runners are about 13"s if that helps you any. If you want more info send me a pm, and we can swap stories.

-Omar Barker
CSU, Sacramento
Hornet Racing Development
http://gaia.ecs.csus.edu/~formula/

[Brodyj]

Omar, what kind of power and tourqe numbers are you able to get?

Email me at brodyj_nospam_@onid.orst.edu (take out the _nospam_ part)

I can show you what we have when you email me