Can anyone provide info as to how I can make my fifth gear longer in my Si. I like the first four, but cruising at 60 miles an hour with the revs at 3 grand is not my idea of fun, plus it would be nice to have some extra top end. Can I swap out the last gear from a DX? Any help would be nice. Thanks.

 

THats nothing.........I tach at 4,000 at 70mph........with a Y-1 trans........which ias about what I did with the ZC trans when I was still running a DOHC ZC....

 

The DX 5th is the same as a Si 5th(different final drives)
An HF 5th will drop your rpms by about 400.
It doesn't sound like much and I was skeptical at first, but it does make a difference. So at 80mph in 5th, it floats right at 3600...instead of 4000.
Try driving at 3600 and then speeding up to 4000 and tell me there's not a difference.

 

Thanks for the advice, I think an HF fifth gear will be nice on the highway.

 

I run 4200rpm at 70 on my ys-1 (gsr).......it's crazy.....
That's on some stock tires....185/75/14
the 5th gear on the hf was a beautiful thing.....us bseries gotta use teh ls gearing for better gas mileage.

 

You'll like the highway cruise with the HF 5th, but you might not like the 4-5 upshift. There is more of a drop-off in revs on that shift, but it's not like I really use 5th gear for anything more than an overdrive anyway. How many times have I really needed to take it to redline in 4th and STILL needed to keep accelerating after I shifted to 5th?

Talk to member "dewarcr" to get more input on how it drives. We just put a hybrid tranny with the HF 5th in his CRX over the weekend. I've had mine since October '03, and I still love it.

Mike