modifying HT18 S4 turbine housing to fit a GT35.
Yes, but...
I would use a stock S5 turbo/manifold instead of the S4 one.
It has 2 wastegates to help boost creep, fully divided manifold/turbo, equal AR between scrolls and doesn't cost much to acquire.
You could also look into the BorgWarner EFR turbo line as an alternative to the Garret GT line.
The main problem with the aftermarket turbo CHRA will be the compressor housing is too big to fit in the stock location and will hit the lower intake manifold.
You can mill the smaller T04B HiFi housing (as used on stock hybrids) to fit the CHRA of the turbo, but you may run into problems with the compressor back plate on the CHRA needing to be machined down too.
Or you can space the turbo/manifold away from the lower intake manifold.
If you want this done Brian @ BNR turbos might be able to advise you/take this project on.
I would advise against doing it as unless you choose a small compressor (GT30ish) you will have boost creep and you will still have to fabricate oil/water lines.
It won't be cheaper or easier than just getting a shorty T3 or T4 manifold and bolting the T3 or T4 flanged aftermarket turbo on in the end.
The only reason I could see doing this would be if you were working around very strict visual inspection for emissions or something.
I would use a stock S5 turbo/manifold instead of the S4 one.
It has 2 wastegates to help boost creep, fully divided manifold/turbo, equal AR between scrolls and doesn't cost much to acquire.
You could also look into the BorgWarner EFR turbo line as an alternative to the Garret GT line.
The main problem with the aftermarket turbo CHRA will be the compressor housing is too big to fit in the stock location and will hit the lower intake manifold.
You can mill the smaller T04B HiFi housing (as used on stock hybrids) to fit the CHRA of the turbo, but you may run into problems with the compressor back plate on the CHRA needing to be machined down too.
Or you can space the turbo/manifold away from the lower intake manifold.
If you want this done Brian @ BNR turbos might be able to advise you/take this project on.
I would advise against doing it as unless you choose a small compressor (GT30ish) you will have boost creep and you will still have to fabricate oil/water lines.
It won't be cheaper or easier than just getting a shorty T3 or T4 manifold and bolting the T3 or T4 flanged aftermarket turbo on in the end.
The only reason I could see doing this would be if you were working around very strict visual inspection for emissions or something.
Full Member
Joined: Apr 2007
Posts: 134
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From: west chicago
just...buy a aftermarket turbo, or make a realistic hybrid. The ht-18 exhaust side will never be able to move that amount of air. Hybrids already have a issue with moving exhaust with much smaller compressor wheels.
Thread Starter
Joined: May 2008
Posts: 539
Likes: 3
From: In the desert!!! Victorville...
I have the compressor and CHRA already for over a year now. I have a spare S4 turbo that needs rebuilding along with a S5. I want to put this setup on my new S4 TII I just got. My vert is getting my HX52. Ot was either that hybrid or my HE351CW I have laying around. I just wanted to do the hybrid route cause I searched the forums and Google and no one give answers. We have a mill here at work and it could be done at lunch. I've already modded one S4 LIM to fit my HX52 with a short manifold I have.
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