I believe the M2J5 is the 5th gen JDM tranny and the M2S4 is the 4th gen SI tranny. I want the higher performance based tranny.

I was going through the gearing of each in the FAQ at this link https://honda-tech.com/zerothread?id=549372 and it appears that the gearing and final drive of the M2S4 is better than that of the M2J5.

Is that right? I am buying a tranny and have found them both that I can get ahold of for reasonable cost.

I just want to be sure I am reading the gearing correctly before I buy either.

Thanks

 

the better transmissions for h series all motor cars are the m2b4 or m2f4(but add an lsd)

 

^^I know, but between the two I have listed which is better?

 

longer gears are better for a turbo, allows more boost to collect. and shorter gears are better for N/A, allows you to get all that power quicker. im pretty sure that is correct. correct me if i am wrong

 

This pic says they're both 4th Gen Si trannies. Looks like the USDM tranny is a good bit shorter...

 

So for an NA build I would be best off getting the USDM SI M2S4 and not the JDM M2J5.

Cause the gears are shorter and the final drive is better.

Is that correct?

 

That's what I get out of that chart

 

Honestly the SI tranny appears to be damn near as well geared as the M2a4-M2b4 doesn't it?

I mean IMO it is in alot of ways even geared better than the 4th USDM Vtec tranny due to the 5th gear.

And the m2j5 is almost equivelant to the USDM Lude S tranny
I just want reasurance that I am reading this correct.

Thanks

 

if your running with an h22a your going to fall out of vtec with a si tranny unless you over rev a tad.

 

i dont fall out of vtec with an accord wagon tranny, which has the same gears as the m2l5 BUT has the 4.266 final drive...I am even running a stock ecu as well, jsut ahve to rev to the limit and you ar all good.

 

yeah ur tranny is geared a little longer then the si tranny. thats why you dont.

heres a link to a graph showing a comparison of your tranny (green) to the si (red)
http://fatboyraceworks.com/gea...are=1

edit: this post is contradictory i wrote it early and messed up


Modified by M2B4 at 9:26 PM 9/16/2006

 

usually longer gears means MORE rpm drop between gears....this tran is the longest gears i have out of the 4 i ahve (m2a4, m2s4 and m2y4 in addition).

 

i will look for the thread im not sure on the rpm drop but theres a guy complaining about his si tranny dropping out of vtec

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by M2B4 &raquo;</TD></TR><TR><TD CLASS="quote">if your running with an h22a your going to fall out of vtec with a si tranny unless you over rev a tad.</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by M2B4 &raquo;</TD></TR><TR><TD CLASS="quote">yeah ur tranny is geared a little longer then the si tranny. thats why you dont.

heres a link to a graph showing a comparison of your tranny (green) to the si (red)
http://fatboyraceworks.com/gea...are=1</TD></TR></TABLE>

So with the longer than H22 Si tranny you'll fall out of VTEC between shifts (or something), but with F-series tranny, longer than even the Si's, you won't?

Hmmm.

 

i c i typed that all wrong it was early in the morning lol let me find that thread

 

i hear people talking they fall out of vtec on shifts, but to me that just means they are not shifting right before rev limit. I initially had the m2a4 in my accord with an h22, then later got a civic and put an h22 with an m2s4 in it, then later pulled the m2a4 out of the accord and put the p2a4 in it.

None of them have dropped out of vtec if i shifted at 8000 indicated (which when using datalogging shows as around 7500 for my car). It comes close, like if a flub the shift it drops out of vtec, but even with accord gear spacing/prelude S gear spacing I can keep it in vtec. maybe i am just special or soemthing....

 

People probably just shift at the redline on the tach.

(I guess?)

 

i guess lol, my tach has redline at 6300, when the needle foes past the end (8000rpm) is when i shift.

 

yeah well the h22 redline at 7400 according to the tach so since your reving to 8k your fine thats what was stated on the thread was to rev to 8 and you wouldnt fall out. but if your only going to redline on the tach they were falling out of vtec.

 

tachs read high, though. 7400 on the tach is only going to be like 7000ish.

 

I have an autometer tach hooked up and they only read like 100 rpms diff