I am in the process of having a hybrid transmission built and shipped out to me. I really want to go forced induction. I was talking to the builder and he said my gears are too short for turbo (i only gain 8 MPH in 4th) . I was thinking maybe S/C then. You guys think thats a good idea?

 

It all depends. I have a forced induction integra with a SIR trans in it.

Driving properly I can stay out of boost very easily and it's nice to punch it and boost comes on quick and the speed is fantastic.

I've lost top end speed though. I can almost make 200kph but I run out of gear by then.

I wouldn't worry about a short geared trans. You'll enjoy the fast responce and can still drive fine.

-Rik

 

what do you mean you only gain 8mph in 4th. as in rev out 3rd, hit 4th, go up 8mph and have to shift into 5th? is that a typo, or do you really only gain 8mph in 4th?

 

Thats correct... redline third, hit fourth, gain 8 mph and I am at 7200 again. Here is a graph of my hybrid trans compared to my Y5 trans: http://www.fatboyraceworks.com...are=1 Green is stock, red is hybrid. Once I can post in the classifieds I am going to look for a Jackson S/C kit.

 

WOW just WOW, IS this going to be solely for a track car? Because those kind of gear retios are for a NA motor that his a high rev limit like 10,000-12,000 rpm. and has a high peakey power curve.

 

Those ratios aren't as close as you're thinking. It's an EX 1st-2nd ZC 3rd DX 3rd for 4th ZC 5th and EX FD. I don't know what you're talking about............

 

i will agree, those are some pretty close ratios, but bearable. i think if you are going to go focred induction you should get some VERY sticky tires, maybe even go with a bigger tire.

 

this has been debated hundreds of times.. shorter gears are better at acceleration. it is a proven fact.. if you are spinning get larger tires

 

but if you get bigger tires, your just changing your ratio... so why not just have a taller geared trans?

 

bigger tire = more traction

 

lol... good point. i stand corrected.

 

7200 rev limit
stock ls
GSR ys1 tranny

its short as hell
i gotta hit 5th for a sec

my uped size is 205 45 16
i have 205 50 16 which is helping me bit making my gear ratios a tad longer