.63 vs .85 exhaust housing
- Thread starter 2QUIK6
- Start date
My car has too much torque, too fast. I am going to try a larger exaust housing, .85. My converter must be too loose. A turbine housing change is easier. Turbo will be a little more efficient, and spool up a little higher in rpm, but maby 20hp more at the top. Stock converter=.63, .....4.1 motor with a high stall converter=.85. Just a guess. Smaller=faster running turbo larger=slower running turbo, more efficient. TTA and GNX came with .85 housings. GN-.63....Max boost may be a little higher with larger housing, before the turbo gets out of it's range. With different turbo/converter/motor/head combos, all changes. This is just another way to fine tune your combo.
turbo buicks
ESADAH!!!
- Joined
- Jun 13, 2002
so rich people run more boost?
What does that mean? Well, if I had only one car, and ate beans for dinner, I would not risk high boost. But TRs are a fun toy for me, and I run high boost at the track, knowing at any time, my motor, or head gaskets may give up. Thats racing! It costs $$. I am not rich, but if I had all the money I wasted on cars, I would waste it on cars.
.63 will have quicker spoolup charactoristics than a .85 reguardless of what convertor is being used. .85 housing will pull more MPH also. I have never tried to do a comparision on how much more boost, if any, you can run with a .85 vs. .63. They have all developed enough boost to destroy what they are bolted on to.
john evans
New Member
- Joined
- Dec 5, 2002
i also have the same problem with my tta.i blow away the dr's on the street and at the track.9"a/c convertor and pt52 turbo.
i am going to try and soften up the bottom with an 85 housing.it will be interesting to feel the difference.very good post.
i am going to try and soften up the bottom with an 85 housing.it will be interesting to feel the difference.very good post.
Hopefully I will be able to tell some difference, I just took off the .85 housing and as soon as I get the WG hole opened up to 1 1/8" on the .63, I'll put it on, this is on a GT35R turbo.
With the .85 housing, it would take several seconds to build up boost, but at 45-60mph it would smoke the tires on the street.
With the .85 housing, it would take several seconds to build up boost, but at 45-60mph it would smoke the tires on the street.
I hope so too, I'm really not sure just how big this turbo is, I thought it was comparable to a PT51/54/60, just the next size up from a GT32 or TE44, so I wasn't expecting it to take a lot to spool it up, but getting a higher stall convertor is not out of the question either. It should support around 550-600hp.
