Jetn3

I currently have a 5.3/eBay gt45 combo with a tial 38mm wastegate and holds 8-9 psi just fine on a 8-9 psi spring. I also have a 3" dp and soon to be 3.5" straight pipe out back. I'll be upgrading to a pt7675cea and I want to run the same 8-9 psi for now. Will the 38mm tial be big enough?

The gt45 has a pretty big turbine already (77ex/87.4in/1.05a/r) and the pt's turbine is a tad smaller. So do I need to worry about boost creep by swapping to a turbo with a slightly smaller turbine, when bigger turbine turbo works fine? Does the compressor side come into play with boost creep?

LS1NOVA

iTrader: (12)

It will be on the edge or working. Only time will tell. The PT is much more efficient.

c0ncEpT

iTrader: (4)

It really depends on gate placement IMO.

denmah

iTrader: (2)

let it rip, if its no good throw on a bigger one or a 2nd one

Twin turbo c5

I run a pt76 on a lt1 with a 38 tial wg for years in my Fairmont. It worked great but placement is key. Mine was close to turbo

Jetn3

Ok cool, I'll try the 38 and go from there. Thanks guys!

Jetn3

How much boost do you run on the 38 TIAL?

Twin turbo c5

I run 16 psi back then. we pushed it to 20 psi on the dyno one time and it made 740 at the wheels.

H&P Performance

iTrader: (2)

I would have to agree...The 38mm Tial should be fine for now. If you had an ebay wastegate I would definitely upgrade to a 44mm tial at least. We had a 38mm ebay wastegate with a 70mm turbo as one of our initial setups on a 2000 Trans Am and boost creep did it in. Definitely put some money into wastegates.