My friend and I have been arguing over which transmission is better for te track.

We both have gsr motors, he has I/H/E and ITR pistons, and I have I/H/E and stage 2 cams with skunk2 IM.

He thinks that his gsr tranny is geared best for his setup and can't possibly have better acceleration and time in the 1/4.

I however, told him, with an Si/ITR tranny (forgot about the LSD for now) that the shorter gears would help me zip through the 1/4 better and put up slightly better numbers.....

Now who is right here and who is wrong, why are so many guys replacing their GSR tranny with an Si one?

 

come on, someone has to have an opinion ?

 

see if i can help you here.
straight line only.

IF, a car is set up to make power in the top end like YOURS is with skunk cams. then a shorter tranny that dosent dip below and keeps the revs up will be better.

but if he has more TQ. that TQ peaks lower then HP does. so if he's not reving up as high as you are. he can afford to drop down in the gear a little lower(notmuch) to use up the TQ resulting from the higher compression.

this is hypothetical.

 

The GSR trans has a gap in the ratios between 1st and 2nd that drops revs to around 53-5400. That is below the point where the intake switches. The higher gears allow it to stay above 5800 on shifts at redline. The Si or ITR trans has closer ratios, especially on the 1-2 shift.

Based on acceleration in gears charts I have seen, I would say that 1/2 to 2/3 of the acceleration advantage the ITR has over the GSR is from the trans ratios. I think it would help any VTEC B series motor.

 

i don't think the gains would even be close to worth the cost of a itr tranny. The si one isn't that expensive, but just leave your trannies alone, the gs-r one is fine.

 

My friend seems to think that the longer climb in 3rd would make up for a faster Si trans......

his theory is, "the longer I'm in 3rd, the more i am going to pull" so that i guess he thinks he is pulling longer or something, than with a Si trans ?

 

I like my gsr trans. I've had both b16 and gsr. b16 rips the best but the gsr is good too. just depends what you want. I wanted the gsr cause I didn't want really close gears.