I was on my way home last night and as I was about to turn onto MY street (I refer to it as my street because its about a 1/4 mile of road with the slightest bend that so far I am still many kills - 0 losses). As I made the turn I started to wonder what was the best gear change I could get to stay within the meat of the power band. I've been told that I am a pretty good shifter but never looked to see what my rpms fall to other than launching, as long as I remained in vtec I never really looked back at the tach after shifting. Well I decided to slow to a 20 roll and see how high I could keep the revs, keep in mind that I do not powershift I just shift as fast as I can with letting off the gas, I punched it and just missed the flash of redline and slammed it to second (7400-7500), because I missed the flash of redline I tried again on the 2nd and 3rd run changing as redline flashes the best change I could get from 1st to 2nd was 7600, with more practice maybe it could be better or not, has anyone else tried this and whats the best you've gotten?
Forgot to mention the road was slightly wet if this makes a difference.

 

I don't totally understand what you are doing.... but I think you are trying to see what your rpm's drop to when you upshift, after redlining the previous gear?

I don't know personally, I never really looked. I just kinda shift as close to rev limiter as I can, and as quickly as I can.

 

You don't always get the maximum power just by shifting at redline. You have to dyno the car, to see where the powerband starts to fall off. When I got done tuning my car, max power was at 8300 rpm, so shifting at 9k in 3rd or 4 th gear was just losing precious time.

 

Actually you are a bit off.

You have to do some math using a dyno. You take the maximum rpm... just before rev limiter and take the torque at that level. Now take your final drive ratio and add it to your current gear ratio. Multiply the torque by that number. that equals FORCE.

Now, if you shift at that point your rpm will drop to say 6400 or so. NOW take the torque at 6400 and multiply it by the final drive plus the next gear ratio and if that number is greater than the first FORCE number you got, you need to shift earlier.

This calculation has been done, and it has been found that optimal shift point is right at rev limiter (just before rev limiter that is). If you are shifting earlier than that, you are losing precious 10th's of seconds.

 

Wow! I am going to shut up now....

I was just always told to look at where the powerband drops off, and use that as a shifting point. Thanks for the correction

 

Yea, WIS2K, is right. If we were all real drag racers, we might dyno every gear, over lap them, then see the pefect shifting points.

 

For any other torque monster, yes, but not for this car. Redline it!

 

[QUOTE]Originally posted by Pappy
[B]Wow! I am going to shut up now....

 

Wis, you got what I was trying to ask, as far as the shift point goes, with the S I find you must shift at the red line before the cut off because peak HP and TQ is so high up in the power band you dont want your revs to fall off too far from peak, you actually aren't losing precious time, so I was just curious to know if anyone one has noticed what they drop to on their upshifts.

 

On the 1st to 2nd shift the revs can't be any higher then 6,000rpm. Reason is that at the speed where the the 1st gear redlines (ie. 69kph/43mph) the 2nd gear can be showing 'only' 6,000rpm. It can't be by higher as you need to be going faster in order to get the revs further up and it is just not possible in the 1st gear.

ps. Just for reference:
- on your 2nd to 3rd shift you can't get any higher then 6,600rpm
- on your 3rd to 4th shift you can't get any higher then 7,000rpm
- on your 4th to 5th shift you can't get any higher then 7,200rpm
- on your 5th to 6th shift you can't get any higher then 7,800rpm