tranny for boost

[wartank162]

well ive been building up the motor for boost (h22) and i just saw that my tranny code was m2j5, which is from an f22b not an h22a1 like they were supposed to send me. now the gears are longer in this tranny then the h22 trannies.
f22b-M2J5 - 3.307 - 1.810 - 1.269 - 0.966 - 0.787 - 4.062
h22a1-M2A4 - 3.307 - 1.950 - 1.360 - 1.034 - 0.787 - 4.266
h23a1-M2S4 - 3.307 - 1.857 - 1.320 - 1.034 - 0.812 - 4.266
there is the m2s4 sitting in a junk yard in tallahasse for $80. my question is, should i keep the tranny that i have since im boosting sometime in the next 6 months or go get that h23 tranny and swap it in? or am i wrong in thinking that longer gears are better for boost?

turbo is a garrett t3/t4 60trim 63 ar

 

[katsiki]

longer gears are def what you need for boost,keeps you under boost longer

 

[slowhatch]

i would keep it for now because there is no guarantee's on junkyard transmissions.

you want shorter geared transmission but being boosted and built this transmission just might suit your needs with its longer gears. im sure there is someone that does hybrid trans. for h22/f22's

 

[ryan89crx]

longer gears are def what you need for boost,keeps you under boost longer

dont ever give advice again, seriously. longer gears are the LAST thing you ever want.

i dont care how much power you are making, shorter gears will ALWAYS accelerate faster

 

[civic98turbo]

dont ever give advice again, seriously. longer gears are the LAST thing you ever want.

i dont care how much power you are making, shorter gears will ALWAYS accelerate faster

just my .02....but i disagree...longer gears are better for boost....thats why everyone wants an LS trans for boosted apps......3rd gear will go to 100mph and 4th til about 130...

 

[ryan89crx]

just my .02....but i disagree...longer gears are better for boost....thats why everyone wants an LS trans for boosted apps......3rd gear will go to 100mph and 4th til about 130...

dude, seriously common sense and logic escape you

if a shorter geared trans accelerates faster on a n/a car, its going to have the same effect on a turbo car. "being in boost longer" is a joke...

 

[Steven.]

dude, seriously common sense and logic escape you

if a shorter geared trans accelerates faster on a n/a car, its going to have the same effect on a turbo car. "being in boost longer" is a joke...

it dosent keep you in boost longer, just takes longer to get to the same speed you would with a short gear tranny.

ask anyone with boost and a long tranny who goes to a short.

 

[katsiki]

dont ever give advice again, seriously. longer gears are the LAST thing you ever want.

i dont care how much power you are making, shorter gears will ALWAYS accelerate faster

oh OK dude lets not get our panties in a twist ,dont care what you say LONGER gears are better for turbo!!

 

[Steven.]

oh OK dude lets not get our panties in a twist ,dont care what you say LONGER gears are better for turbo!!

so where is this a proven fact?
go drive a 88-91 civic with a HF tranny, then drive one with a SI.

longer gears are not always better

 

[BlackHopeDC5]

oh OK dude lets not get our panties in a twist ,dont care what you say LONGER gears are better for turbo!!

here is probally what happened.. You heard somewhere on a forum somtime that longer gears are better for turbo. Then someone else came into that thread and said somthing to the degree of "". And im willing to bet you then heard the samething somewhere again. It made sense to you when you rationalized it in your head so you took it and stored it as true knowledge in your head.

Here is the real deal.. Long gear suck big time.. It doesnt keep you in boost longer...youll just have a lower acceleration and higher top speed Thats it

 

[ryan89crx]

oh OK dude lets not get our panties in a twist ,dont care what you say LONGER gears are better for turbo!!

you obviously have no first hand experience, you are just relaying information that you read on the internet

i DO have first hand experience with both n/a and turbo motors and long/short geared trannys, you do not know what you are talking about

YOU need to research before you even attempt to give advice.

here, directly from Jeff Evans, one of the best tuners in the nation
http://forums.evans-tuning.com/viewtopic.php?t=1496

Gear ratios are merely a way to trade torque for rpm. With a higher numerical gear ratio, you are putting more rpm at the wheel. With closer gear ratios, you are able to stay at a higher rpm in between shift points. Something like the LS transmissions are suited more towards the broad torque curve/low reving LS engine. It keeps you in the peak torque area in between shifts. The ITR/SI/GSR transmissions keep the rpm's built up in between shifts, to stay in the more peaky powerband.

Having said that, for the track the itr/si tranny is the best hands down. Most high whp turbo engines are operating between 5.5-9k, and having their shift points in between. In combination with a tall slick size (24.5"+), and the high shift point (8.5-9k), you are able to keep the engine operating within the optimum torque curve.

With the LS transmission, between shifts it would possibly drop you out of the optimal powerband and therefore make you slower. Gearing simply put allows you to stay in the powerband of your engine in between shifts.

The myth that you stay in gear longer with the LS transmission makes you faster is purely false. Think about that statement for a second. Acceleration is the measure of velocity over a unit time. Watching the rpms climb on the tach during a 3rd/4th gear pull, they would be climbing slower than with the si/itr tranny. Looking at the definition of acceleration as a measure of velocity over a unit time, the engine would be getting to the same velocity over a slower time lapse. This would yield slower acceleration, and simply put make you slower.

Having said that, the gsr transmission is probably the best balance of a street/strip transmission. The gearing is a little less aggressive as the itr/si transmissions, which will yield a little more traction. For all out acceleration si/itr tranny wins hands down. For a slower car, go with the LS transmission.

Its really not a "Jeff ends all debate". Its purely mathematical. The very definition of acceleration is based upon gearing and torque with a car. More aggressive gearing will yield greater acceleration rate, given traction is not an issue. If they were going faster, they were getting more traction down to the ground. Its as simple as that. Tire size is basically a final drive scaler, if they kept the slick size constant and change transmissions it traded less torque at the wheel for more rpm. Why do you think that all the fastest guys in SFWD run 25~26" slicks with the Si gearing? Its easier to use a larger diameter tire to put out less axle torque, and slow the rpm's down a little bit to gain traction...

 

[katsiki]

you obviously have no first hand experience, you are just relaying information that you read on the internet

i DO have first hand experience with both n/a and turbo motors and long/short geared trannys, you do not know what you are talking about

YOU need to research before you even attempt to give advice.

here, directly from Jeff Evans, one of the best tuners in the nation
http://forums.evans-tuning.com/viewtopic.php?t=1496[/QU

then why did my turbo teg top out at like 120 with b16 trans and like 135 with LS trans

 

[SickEk]

if your going for top speed the ls would be better with taller gears. but for the acceleration the si or itr's would be best with shorter gears and gears are closer spaced if i am right.

 

[ryan89crx]

then why did my turbo teg top out at like 120 with b16 trans and like 135 with LS trans

oh, so top speed makes you accelerate faster?

wow, its like talking to a wall

 

[fakerims]

all this talk about long and short makes me think about sex with hot chicks, long penises will make a girl cum faster and shorter ones wont make them cum at all

 

[Steven.]

oh, so top speed makes you accelerate faster?

wow, its like talking to a wall

so true

some people just dont know man.

there the people who come and ask why there car is slow with long gears in boost.

how logn did it take you to get to 130? long time
now how long did it take you to get to 120.

woudl you want longer gears at the track? no, would take you longer to get through gears,

i knwo first hand. my bro had a HF tranny with his mini me, was atleast a 15second car, he rand low 17s and only got to end of 2nd by the end of 1/4 mile.


LONG GEARS SUCK NUTS.
ive had both SI and HF tranny, i prefer the fast acceleration over long geared one.
although dropping in into second gear on the high way doing 70, goign up to 90 was nice for a quick pull, then into 3rd and rpms drop way down.

 

[slowhatch]

then why did my turbo teg top out at like 120 with b16 trans and like 135 with LS trans

oh, so top speed makes you accelerate faster?

wow, its like talking to a wall

oh of course haven't you seen the fast and the furious?

 

[trace01m]

Diamond plate floors FTW!!!

 

[katsiki]

dude Im not a ricer and yeah I guess I was misinformed no need for the fast and furious remark thats just cold

 

[katsiki]

and I guess it was faster with LS trans because it helped it gain traction cause i was def quicker off the line with less wheelspin