T25 turbo on CRX SI tranny - too small??

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10-11-2005, 03:51 AM

amh0001

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T25 turbo on CRX SI tranny - too small??

Alright,

I have a CRX SI, with SOHC ZC using the stock SI tranny. I also have a homemade turbo kit that ive built using a T 25 turbo. Now I noticed that on the freeway around 65-75 mph I am constantly at a high rev of 3500rpms.

My question is: wont that many RPMs keep the small T25 turbo at almost full boost while just crusing on the freeway? In turn killing gas mileage, turbo, and engine?

So I was considering getting CRX DX, and going MPFI then boost, or Just getting the DX tranny for the longer gears then boosting. Any Info would be great thanks

~Adam

10-11-2005, 06:41 AM

chirp the 1-2

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Re: T25 turbo on CRX SI tranny - too small??

bump for some experienced answers i woulld also like to know if the dx tranny is better than the shorter geared si!!!

10-11-2005, 10:47 AM

hondacrx03

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Re: T25 turbo on CRX SI tranny - too small??

i had a dx trany on my dohc zc turbo i liked it. the longer gears were nice

jesse

10-11-2005, 11:18 AM

bumblezc

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Re: T25 turbo on CRX SI tranny - too small??

Just get a bigger turbo!!!!!!

No your turbo won't be making boost, BUT one slight flick of the Accelerator pedal and WHAMMY you'll have boost instantly!

10-11-2005, 11:30 AM

ghettoturbo

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Re: T25 turbo on CRX SI tranny - too small??

might make a little boost...i had one of those thunderbird ihi's and it made about 4-5 psi on the freeway doing about 80

10-11-2005, 01:22 PM

amh0001

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Re: T25 turbo on CRX SI tranny - too small??

thanks for the imput guys. Anyone else have this set up? I know jeff did on his second project I believe.

10-11-2005, 03:29 PM

HMT-Admin

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Re: T25 turbo on CRX SI tranny - too small??

at cruise your not going to see any boost reguardless, if you tip in throttle it may spool pretty quick on the higher gears. But I honestly wouldnt worry about it. And there is no way in hell I'd ever recommend getting a DX tranny to replace the SI trans. The longer geared w/ boost myth is crap, if you want good quarter mile times and a all around fun car to drive, go with the SI trans, trust me

Jeff

10-12-2005, 03:10 AM

amh0001

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Re: T25 turbo on CRX SI tranny - too small??

Awesome, Thank you jeff, I am now one step closer to being boosted woot!

10-12-2005, 03:30 AM

90dx

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Re: T25 turbo on CRX SI tranny - too small??

I had exactly that setup -motor,tranny,turbo on my car until a month ago.It was awesome on the highway just light on the throttle and zero boost.When you want to pass boost is absolutley instant and it felt like a nice V6 at the 11-12psi I was running you could pass traffic with a flick off the throttle.As much as people hate on the T25 I liked it for the awesome street power as it made great low end power and up to 60-70mph i could walk on alot of cars with much more hp.After that spped though they would catch up and go by.I blew the SI tranny up and replaced it with a DX and it just plain sucked, I thought maybe that long gear theory held some truth but it def deosn't.Do it you will love it and it will make for a really fun street setup capable of 13's easy.I had 2.5" mandrel bent side exit exhaust with no muffler so that was def helping with spool as well.