Starting to gather parts for turbo install on my '93 and have a question. Knowing the rearend is a weak point and that I'm not looking for a lot of hp (I enjoy the handling of the car the most) and am looking for a little more power for hills and passing. Has anyone ever built a system for moderate hp gains but with a slower spool to minimize the stress on the rear differential? Will probably upgrade the diff. eventually but not building a track car so not expecting to subject it to that kind of abuse. Had a turbo Shadow years ago and enjoyed the feeling when the turbo kicked in and would like to get that sort of mid-range feeling again.

 

Differential usually blow up on launching. I've seen 220whp+ on 1.6 diff without a problem. I don't quite understand the "slower spool to minimize the stress" on the diff.

 

I think he means so boost will roll in when he is already rolling. Instead of something spooling up at 1500 have it spool at 4500... I could be wrong though

 

Maybe it'd be better to alter you're driving style just a tad, if you're worried about the diff busting then just take it easy on the launches. As long as you keep your throttle under control the turbo won't even need to spool at all. most kits i've seen kick in at around 3500 anyway

 

Yup, control your boost via the go pedal. Even if you have a smaller turbo that likes to spool sooner rather than later, easy launches with minimal input of throttle will work.

 

I use TPS based boost control. If I hooked up my VSS I could do geared/speed based.

 

Yes Ryan that is what I had in mind. Not worried about my driving, being a little older and experienced am a fairly capable driver but not so my son who I allow (heaven help me) to drive it some also.

 

I run a relatively low boost big turbo setup that does more or less what you're saying. I'm at somewhere around 250 rwhp and running between 7 and 10 psi (depending on my mood) and it's quite civil and fun. I'm only in boost when I need to be in boost.

 

This is what I had done in my 5L with my 80mm. No electronics required, just a big snail

It worked well as my trans was a weak point. Car ran good with big boost and was absolutely retarded at around 4000 RPM

 

Big turbos on small engines are really fun when you roll into boost. And it would defiantly help the life of the drivetrain. I wiped out my diff with a stock 1.6