This is my first Turbo car and assumed that it was like any other until I spoke with a friend. For the best 0-100 time my assumption was to floor it to redline (~7k rpm) then shift into the next gear (provided that you only want to get 6 mpg). I have no problem with this technique but a friend of mine just told me that I should be shifting around 4-5k rpm when my boost was at maximum in order to provide a boost at the beginning of the next gear. This might not even be possible or make much sense but I honestly don't know which is right. This may sound like the dumbest question ever but bear with me because I'm completely new to this type of car. Maybe Ive had it all wrong from the get go so please enlighten me.

Thanks

 

Moved to the appropriate forum.

 

Someone correct me if I am mistaken but I always assumed you should shift just on the other side of your power band, just beyond peak power so you will be closest to the highest part of your powre band as long as possible. For me its 6700 rpm or so cause my peak power is at 6500 rpm.

 

Ideally you want to shift in a fashion that puts you in the right place for the next gear while not simply winding up the previous gear needlessly. This means shifting at the end of the your power peak rather than waiting for power to drop off around redline.

 

That's what I was told. Sometimes its a little vague with numbers and even with a dyno since there's SO many dynamic variables to consider. I know with some of the race teams, they just see what gets better speed down the straight by looking at the data. They'll tell us to shift at one point for 10 laps or so, then at another point for another 10 laps and see which average a better time/top speed. I'm sure you could do this too with simple road pulls and a stop watch if you REALLY wanted to know.

As far as an Evo goes, with both stock and the Works cams, I believe the fastest acceleration was seen while shifting at around 7000rpm-- I think mostly because it was easier to grab the next gear without waiting for the revs to drop from 8000rpm.

 

what about when to downshift? im not very good at guessing when to downshift or guess how fast theyre spinning, is there anyway for me to know for sure by looking at the gauges?

 

you just need to get a feel for the car when rev matching, when id been driving my car for a while i could downshift rev match without looking at the rev counter, you need to know how your car behaves IMO.

 

i do it before 200-300 rpm of the peak power so it is allows me time for shift . But i am usually if i am racing i hardly lift.

If you have a dyno sheet you can figure it out very easy. For me since mine is a rally car startlingly for others i do shift 5900-6000rpm. My car drops power big time around 6200rpm

Rob

 

personally, i like to build boost in 2nd, and then hammer into 3rd with the turbo fully spooled, it pulls like a mo fo through 3rd, and hitting 4th is like a rocket

 

If your able to log your pulls on a laptop, you can watch where power drops off and shift right at or before it peaks.
-shane

 

Nice

 

jacks transmission has some pretty nice stuff to say about mitsu***** transmissions lol .... The way they did the syncros are amazng.. My twin disk hates shifting above 5 k tho its really annoying