is it really so much diff from HF? I was driving my Si home today from Illinois and at 70mph it was at 3500rpm, is that right?

 

yeha....
the Si does 3600 @ 75 mph and my DX does 3200 @ 75mph

 

the HF gears are alot longer than the SI, here are the specs:

SI
1st: 3.25
2nd: 1.894
3rd: 1.259
4th: 0.937
5th: 0.771
Final Drive: 4.25

HF
1st: 3.25
2nd: 1.65
3rd: 1.033
4th: 0.823
5th: 0.694
Final Drive: 2.954

 

so 4k rpm at 80 is fine for the Si engine?


[Modified by MOCrxHf, 10:29 PM 1/18/2003]

 

http://crx.honda-perf.org/math/index.html
Thats about right for the si gearing according to this, as to if its all right for the engine to run that high? Its a 13 year old car and its still on the road, guess its okay with doing 4k at 80mph.

 

If it bothers you, you could put an HF 5th gear set into an Si trans and have the best of both worlds.

 

yeah but you'd have to take the fourth gear to redline to not stall out...its a wide gap

 

nah it doesn't bother me, I'm just not used to it, I am used to looking down and seeing 2500 rpm at 80mph, not 4000 lol. If that is the way its supposed to be, then fine.

 

While we're on that subject, are the gears from an 89 CRX Si a tiny bit longer than the gears in a 90 CRX Si? I used to have an 89 Si and now that I have a 90 si, i noticed at 70, the 89's rpms were a little lower, by about 300 rpm.... Maybe somethings innaccurate? I dunno...

 

I've been told no, but I have an 88 DX trans that I tore apart and counted the gears, and the FD ratio is much taller than other dx's (although not as tall as an HF) So I think they made some changes from year to year.