is this turbo too big

[zexystang2]

Also i have a exhaust cutout on the car.

 

[GB10]

Exhaust cutout may help slightly, but if the turbine/housing is undersized like CPRSM was saying it won't help enough. Sounds like what he said where the compressor moves too much air for the turbine. I'm assuming you have a 3" downpipe? What size is the downpipe outlet of that turbine housing?

 

[CPRsm]

Ask them what they're going to resize. They don't offer a larger turbine in that frame

 

[SonicGT]

FYI I watched a single turbo Precision 67mm make 540 to the tire on a bone stock 3v motor on 10#. A 76mm isn't too big and should make more then 540.

 

[zexystang2]

he said resize down to a 7275

 

[CPRsm]

Do you have a dyno graph w boost?
More hp w a smaller turbo would be pretty amazing. (No offense to you)

 

[Bobby]

If you are tunning cut outs then it isnt a back pressure issue. How much boost arr you running or trying to run.

 

[CPRsm]

Cutouts would only solve a back pressure issue if it was caused by post turbine pressure. It won't fix an undersized turbine.
The 79mm on a coyote w the same AR maxed at about 7psi. A smaller/less effecient engine will be able tompish it farther but not much

 

[Bobby]

True I was referring to back pressure on the exhaust side

 

[CPRsm]

Mah bad lol

 

[weather man]

Any updates OP?

 

[Wicked97]

what kind of dyno?