In first gear should i be taking my car right to 8000 rpm?, im pretty sure i should be because then the needle drops right in my powerband but im just checking, also in 2nd and 3rd where should i be shifting so i am not loosing power ? i have a 01 se 5th gen thnks

 

Shift right before fuel cutoff.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Paul H22A4 &raquo;</TD></TR><TR><TD CLASS="quote">Shift right before fuel cutoff.</TD></TR></TABLE>

only for the 1-2 shift.

the other gears are somewhere closer to ~7000 rpm (real) or 7400 rpm (tach), which should not only land you in VTEC but also is very close to peak hp on an h22.

 

thnks for the advise but where is fuel cut off?

 

it is different for everyone. MY fastest times have always come from tach shifting at 8000rpm 1-2-3-4 shifts through the quarter mile. You have to experiment.

 

and depends wat sort of gearbox u have

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by americ_ian &raquo;</TD></TR><TR><TD CLASS="quote">and depends wat sort of gearbox u have</TD></TR></TABLE>



Care to explain?

 

I wrote this a while ago for the 5th gen Prelude... I still have yet to see anyone show why you shouldn't shift at redline for every gear.

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Just multiply your torque level with your gear ratio at the RPM shift points... From what I see from my dyno is that I generally want to shift at redline every gear. Going by my own personal dyno and the stock Prelude ratios:

We assume that the final drive is consistant thoughout so we'll eliminate that from the equasion for comparison purposes.

1st gear redline: 115 lb/ft x 3.285 1st gear ratio = 377.8
2nd gear rpm drop to ~4500 rpm: 125 lb/ft x 1.956 2nd gear ratio = 244.5

So we conclude that yes... rev that thing to redline.

2nd gear redline: 115 lb/ft x 1.956 = 224.9
3nd gear rpm drop to ~5250 rpm: 130 lb/ft x 1.344 = 174.7

Again we can conclude shifting at redline, good.

3rd gear redline: 115 lb/ft x 1.344 = 154.6
4th gear rpm drop to ~5800 rpm: 140 lb/ft x 1.034 = 144.8

Again, I think we can conclude that shifting at redline is best.

4th gear redline: 115 lb/ft x 1.034 = 118.91
5th gear rpm drop to ~6000 rpm: 140 lb/ft x 0.812 = 113.7

My information is based upon the 5th gen Prelude gear ratios and my dyno along with the gear accel graph shown here

this goes to show that the H22 motor using the stock 5th gen ratios takes full use of it's very flat torque curve and this allows it to use the entire band to the redline. For those of you with a 4th gen VTEC here and here. These will allow you to figure out your own shift points since the 5th gen gearing varies from the 4th gen especially due to the 4th gen having smaller tires.

 

well timeracer summed it all up...but as in my case.. i have a 4th gen prelude h22a, with an m2j5 gearbox.... wen i change below 7,800rpm from 1st to 2nd i drop out of vtec, so therefore i have to rev up to 8,000 to stay in vtec from changing from 1st to 2nd, all other gears are fine...i used to have an m2a4...and i have a superlight flywheel and crank pullely, so the revs drop real quick... but back wen i had my m2a4, i culd change at 7,000 and it wuld stay in vtec...so therefore hinting why i sed, it also depends on which gearbox u have...