bigger compressor wheel or bigger turbine housing?

[dsm1kenobe]

besides changing the turbine, and compressor housing, you can get more out of your turbo by increasing the size of your compressor wheel or turbine housing.

my question is, for a street application using only 91 octane, which would give me a more useable power in the 4.5k-8k,

stage III, 0.82 / 50 trim, t04e cover

or

stage III, 0.63 / 60 trim, to4e cover

in other words, would you go bigger CW or bigger turbine housing?

 

[loreak]

well your upgrading to a 60 trim and downgrading to a lower a/r......so your going with a bigger wheel to increase flow but making your exhaust side flow less which will decrease overall flow

from what ive read you will make the most power on pump gas using a 50 trim and a 60 trim would only be beneficial at higher boost on race gas

 

[dsm1kenobe]

let me clarify...

the turbo i have now is a stage III, .63 / 50 trim, t04e

should i intall a bigger CW OR larger turbine housing for more useable power in the 4.5-8k range ??

 

[jdmawd]

Originally posted by dsm1kenobe
let me clarify...

the turbo i have now is a stage III, .63 / 50 trim, t04e

should i intall a bigger CW OR larger turbine housing for more useable power in the 4.5-8k range ??

Since your mod list is so detailed. id have to say if you dont have cams you might want to add them.

 

[dsm1kenobe]

i have built motor, magnus intake, mildly ported head, crower valvetrain, SS valves and HKS 272s.

bigger turbine housing or bigger CW?

it seems as though i should stick with the 50 trim and go bigger on the turbine housing - .63 to .82 since the 50 trim performs better (more useable power in 4.5k-8k using 91 octane) than 60 trim. just wanted ppls opinions on this.

 

[Kingdom]

moving to a .82 will move the power band up, probably wont make that much additional power because your not maxing the exhuast housing flow with a 50trim.

I would change to a 60trim and stay with a .63. it will move the powerband up and give you a chance to make more power.

alot of people change to a .82 and dont realize a very big power increase, on the other hand jumping from .48 to .63 will.

your turbo seems like a good combo, or let me put it in other words a succesfull combo. it should pull hard to the 8k range.

 

[dsm1kenobe]

i heard that 80 hp gains are typical when going from .63 to .82 a/r and keeping the 50 trim t04e and stage III TW.

 

[Kingdom]

Originally posted by dsm1kenobe
i heard that 80 hp gains are typical when going from .63 to .82 a/r and keeping the 50 trim t04e and stage III TW.

80!! thats a lot man! something around 40hp is more reasonable.

alot of people reach the max hp the wheel can offer using the .63 which is around 400-420whp, jumping another 80hp on top of that is impressive.

 

[Groomz]

Stick with the 50 trim .63 A/R in my opinion. You need race gas and tons of RPMs to make anything bigger make more power than a 50 trim. Just what I think though.

 

[pneumo]

If you have the $ to do it, go for it. Turbine housings are just a few hundred bucks, and they're easy to change out. If you don't like the .82 it's easy to change back.

 

[Kingdom]

Originally posted by pneumo
If you have the $ to do it, go for it. Turbine housings are just a few hundred bucks, and they're easy to change out. If you don't like the .82 it's easy to change back.

yes, this seems like your best bet. if you have the 5-bolt design, you might want to consider the new 4-bolt which flows more, but you have to modify your 02 housing.

 

[dsm1kenobe]

the spoolup with a .82 should be around 500 rpms later. i'm willing to wait that long for an 80hp gain.

 

[Groomz]

Race gas people. These are theoretical gains that are probably only going to be seen on 500+ horsepower machines. Street cars won't see anything different between the two except for lag.