Anyone run a .68 exhaust housing on TC76 or T76?
10-13-2009, 02:51 PM
#21
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Just pulled off the .68 housing and I was surprised how small the opening is past the flange as it enters the turbine. Side by side comparison with a .81 off a T67 and the .68 looks similiar or smaller. That's alot of exhaust thru a small opening.
I think that might explain why my car pulls like crazy and just goes flat on top. 10psi about 520 crank horsepower and it's struggling on top.
I think that might explain why my car pulls like crazy and just goes flat on top. 10psi about 520 crank horsepower and it's struggling on top.
11-18-2009, 09:36 PM
#25
we did an on the dyno swap from a .68 to a .96 housing on a mp70. this was a 5.3 with only valve springs. ignore the first part of the chart, i think i rolled into at different rpms.
https://ls1tech.com/forums/forced-in...96ar-swap.html
i think what it comes down to is that a ptrim exhaust wheel will only flow soo much and that the different a/r's are just for fine tuning. to get any real diference you need to step up to a q or s trim exhaust wheel.
that being said i dont think a .68(ptrim) is going to hurt you that much compared to a .96(ptrim).
https://ls1tech.com/forums/forced-in...96ar-swap.html
i think what it comes down to is that a ptrim exhaust wheel will only flow soo much and that the different a/r's are just for fine tuning. to get any real diference you need to step up to a q or s trim exhaust wheel.
that being said i dont think a .68(ptrim) is going to hurt you that much compared to a .96(ptrim).
11-18-2009, 10:13 PM
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Ended up with a .96, it spools almost as quick as the .68. I haven't had a chance to really open it up but from 50-90mph it pulls MUCH harder. Even the exhaust tone at idle sounds different. From the advice I got from different turbo vendors and experts they said they run the .68 when they go twin turbo.
11-19-2009, 08:41 AM
#28
11-19-2009, 08:47 AM
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It runs so much better, I didn't think the .68 would fall of like it did, I thought I would loose a little on the top but not just have the motor nose over like it did.
