Non-stock turbos?

[SuperTurboD24T]

I just wanted to see if anyone is using a turbo that is something other than the stock fitment TA0304 Garrett. Perhaps, something more modern, larger, of the VGT type, etc.

[cuaz64]

Well, the most popular upgrade that has see is the Garrett T3/T4 hybrid, being the T3 Turbine/center section+T4 compressor the easiest (and cheapest) option.

[Jason]

I was thinking a Straight T-3 or a mild trim T3/T4...Is the stock garrett a T-3 exhaust flange?

Jason

[cuaz64]

Originally Posted by Jason

I was thinking a Straight T-3 or a mild trim T3/T4...Is the stock garrett a T-3 exhaust flange?

Jason

I think so.

[SuperTurboD24T]

Yes, the stock manifold has a t3 flange, which makes things very easy for upgrades.

The stock turbo is good for about 25 psi with an intercooler and a low restriction exhaust system. Above that boost, the drive pressure is simply too high, and you will begin to get a loss of power. That actually occurs at ~28psi, so a margin of -3 psi will be proper.

The compressor maps for the stock turbo are wrong as well, if you should ever come across them.

[Jason]

So is it not worth upgrading the stock turbo to another turbo if your running less than 25lbs? I think I would be happy with 15!

Jason