Was talking to a fellow car enthusiast last night. He mentioned that spinning the F20C to 9k is unecessary. Says that max hp is reached at 8300, and the torque curve drops thereafter. Concluding that shifting at 8300 rpm would be appropiate.

I normally shift at 8900-9000k because I still feel it pulling, sounds good, and because I CAN!!!

What he says kinda makes sense. How do you guys feel?

 

Wouldn't shifting at redline make you land in the power zone in the next gear?

 

I think if you look at a dyno chart you'll see the hp gain starts to flatten out around 8500 rpm....maybe someone here has a link that shows their chart...

fltsfshr

 

Torque and HP have a direct mathematical relationship. Torque without RPMs doesn't generate acceleration. Maximum acceleration comes from maximizing the area under the HP curve. If you shift at the peak, your next gear will start much lower on the curve than it would if you shift after the peak. You really want to center the peak in the middle of your shifts.

 

Actually, if you shift at 8300 RPMs in 1st gear, 2nd gear will put you out of VTEC, which will suck ass.

 

If you have VAFC, even better when you shift at 9K. Stock power drops off after 8300.

 

Someone quite a while ago had charts showing torque vs. RPM in each gear. The key that was shown was that you want to shift when the torque in the lower gear drops to the same torque rising in the next gear. The torque curves never cross in the S so your only choice is to use redline in each gear.

Sounds like someone wanted to race you and win...

 

that fellow car enthusiast is an idiot. no offense. i know max hp is at 8300 rpm, but when you shift at ~9k rpm, you will still be in vtec zone for the next consecutive gear.

 

I think those who agree that shifting at 9K rpm is right!!! U WILL be in the high CAM region after the gear change- which means u will be hauling butt with the opponent breathing ur exhaust fumes!!!!!

 

Only one way to prove real-world results here: try different shift points on track and compare lap or trap times IMHO!!!