What tranny would you all use for a 8-10psi (properly tuned) b18c? This motor will also be built and boosted hard in around a year.

Thanks..

 

shortest gearing

 

You don't want to use the short gearing with boost, under boost it will rev so quick that you won't be under boost long enough before having to change gears again. It would depend alot on the setup you have to. If your car is a hydraulic tranny car then use the GSR tranny with a Quaffie. If you have a cable tranny car then use the 92-93 USDM Integra LS YS1 tranny with a Quaffie. The reason is that these trannies have stronger housings then the others. Perfect gearing and strength for boost.

 

You just explained why you would want to have the shortest gearing possible. You will accelerate the fastest with the shortest gearing. The gsr tranny is the best for overall street/strip acceleration with more focus on street. The b16a tranny is what i run, and alot of other fast hondas on this site run as well. The 4.4:1 final drive works very well. Conversely, the LS is the worst gearing possible. I am using the LS tranny on the street right now with my set-up until I get the Quaife installed into my b16a, and its quite noticable how much faster the si tranny is.

 

I read something about with stock GSR cams, when you shift with an ITR tranny, the RPM's you land at bypass the area of the powerband that you want to use... I should have specified the cams. The motor is completely stock internally... for now.

 

u want the shortest gears possible but do u want to shift into 5th in the 1/4? how do u think that will effect acceleration?

how high can u rev the motor?

what size tire or slick are u going to run? a large diamater tire has the same effect on gearing as a numerically lower final drive.

do u even care about 1/4 mile or do u just want insane power on the streets from 0-80? do u highway race? or do u just want as much pep as possible, but this is your daily driver, ur not a drag racer u dont want to cruise in vtec at 70mph? what tranny is best for u and your set up cant always be answered simply.

i ran into a problem with my car selecting a tranny. I selected a gsr tranny over my LS cause of the shorter 3rd/4th gear and the 4.4 final drive. im looking at making 325hp or so in the near future. My LS motor only revs to 7500 rpms. on regular 205/50/15 (23") street tires i can only do 114mph in 4th gear @ 7500rpms w/ the gsr tranny. right now im trapping 110mph in the 1/4 w/ 275hp and the LS tranny and over wieght. it may go 112 or so on the gsr tranny and proper wieght. whats gonna happen when i add 50hp? ill be trapping around 117 but damnit my tranny can only do 114 in the 1/4. plus the 117mph trap speed is an average mph at the end of the track, what i hit at the finish line would easily be 120mph. w/ the gsr tranny im going to have to spend a good portion of my 1/4 mile in 5th gear so what was the point of my shorter geared tranny now that im spending 200ft in a .787 gear. so what do i now? i guess i have 2 options. run a larger tire/slick(how big can i go?) to make my gears longer again(so what was the point of going short?) or raise my rev limit(whats the point if i dont make power past 7k?)

p.s. im in no way saying the LS tranny is best or anything i just think everycar is different with a different powerband and each tranny can be good for someone.


[Modified by DIRep972, 10:57 AM 12/31/2002]

 

I'm running a stock b18c, hondata tuned. I've got the redline at 8200... (I can change it to whatever I want, but I've got a stock head).

I want to build this car to be a 1/4 mile drag monster that I happen to drive to work...

Previously, I had the setup on an FMU, stock drag manifold, GSR tranny (no LSD). I ran a 13.003 @ 109.95 (6000ft elevation). I can't remember how far exactly, but I was fairly deep into 4th at that setup.

I've added a fair amount of power since then.... but I don't know how much faster I will be.... as the tracks are closed here until the last day in March.... ouch. Is the goal to stay out of 5th in the 1/4 unless it at all possible? I know it will be hard to actually shift into 5th inthe 1/4... and that gear has a really short ratio...

 

its not that bad if u just shift into 5th at the end for a split seconed. u just dont want to spend any good amount of time in that gear, the longer ur in 5th the more time u have to contradict the acceleration u gained earlier by having the short gears. unless ur gears were short enough u could top out 5th too like the ericks racing car but damn thats alot of shifting. IF ur already 110mph car and u dont want to run anything larger then a 24" tire i would stick with the GSR tranny. GSR tranny is perfect for u really.

 

DIRep972 is that you in your avatar?

 

no, is that you in your avatar?

 

Here's a concept. Running a GSR tranny with large wheel size (say 17's) actually would degrade your acceleration with larger heavier wheels. You know unsprung weight as the rotational mass. I'm sure you all know about that . An Ls tranny with say 15" rota's would have long gearing for the top-end and smaller light weight wheels that would aid in the acceleration of the car. Would they be comparable or do you think one would have higher top-end, or accelerate faster on the same car? I know the 17's would provide better traction, but at what cost? I'm using the Ls set-up I stated and was wondering this the other day.

 

I think this topic has been beaten to death on here. I think the best boost tranny is the itr. fastest thru the gears and with a big tire you can go 150+ in 4th w/o having to shift 5th.

 

i thought you motor matrix guys ran a ls tranny on your civc. i saw on a post where you could barely get any traction. would you even be able to drive that ride on the street if you had a short geared tranny like the itr?

 

No, I run an ITR tranny on my car. I do drive it on the street. I'm sure if you are from ft lauderdale you have seen it. I run mostly 2nd or 3rd gear up with a progressive boost controller. In the video i think you saw I was on a straight 19psi and it wouldnt hook until 3rd. Most of the street races I had were at 14psi-20 and the car would hook fine in top of 2nd and 3rd. Trust me the ls tranny is not what you want. people think cause you can sit in 3rd forever its the way to go but you need to get thru 2nd 3rd and 4th as fast as possible thats what gives you the best acceleration.

 

JDM ITR tranny with boost is the best ...the faster you can get into higher gears without dropping too many RPMs, the faster you accelerate....and there is no problem boosting with the ITR tranny..

 

the only downfall of that tranny is the lower top speed that you can achieve in 4th. with 24.5 slicks i believe it is around low 120's. with a GSR Tranny and JDM FD you can do 133MPH in 4th with 24.5 slicks at 9000rpm's.

 

The only thing I like about my LS tranny is that it's a comfortable daily commuter at highway speeds in 5th gear. After driving my brother's car--Si tranny--it pulls pretty nicely in 3rd and 4th gear, but the high rpms gets uncomfortable after a while.

When the power-to-weight ratio are the same, the car with the tighter gearing will out-accelerate the tall-geared one.

In the future, I'm thinking of going with a b16a tranny and an LSD.


[Modified by sando112, 6:20 PM 1/1/2003]

 

if your staying under 100 mph, the jdm ITR would be the best.

whatever you do, do not get a LS. this has been covered a 1000 times, and most people know whats up by now.

 

4.400 fd
usdm ITR 1-4
jdm 98+ ITR 5th for top end

on high boost jdm ITR with the short fd is not that good, I switched to 4.400 and it is better.

 

I traded my j1 trans for an ls, into which i just installed an lsd from a Y1 cable trans. My whole reason is that i do a LOT of highway driving, and staying at 5000rpm for two hours with the j1 got old fast.

bottom line is:
Mostly highway driving - consider ls
Mostly drag or city driving - consider itr