HP limit with a 2.5 and .48 turbine housing?

[Tim_K]

Ain't got a lot of cash to spare, but I need to get a Garrett in place of the Mitsubishi turbo. I know I should spend the cash on a .63 housing, but if I stick with the .48 housing, how much HP can my 2.5 make before the .48 housing starts to become a restriction? I have a 2-1/2" exhaust system with no cat.

[TheRock]

I would say a stock Garrett on a 2.5 could flow around 275whp if tuned well. High-flowing intercooler required, of course.

[turbovanman]

We'll find out soon enough, you can see my sig as what I had, will be running same turbo with 50 trim, same exhaust turbine and ratio then will hit the dyno shortly after its installed. :big grin:
Figure it will be good for at least 300 whp, seen as my boost was so high and completely out of the compressor map.

[iTurbo]

I'm also planning on maxxing out the stock turbo.

My Omni GLH has:
2.5L - no balance shafts
stock T2 head/cam/manifolds
stock T2 Garrett T03 turbocharger
'89 2.5 T1 SMEC electronics
3" exhaust - (swingvalve, downpipe, no cat, Ultraflo) 3" mandrel bent
large NPR intercooler - 2.75" charge pipes (2.75" mandrel bent aluminum)
3" cold/ram air intake (3" mandrel bent aluminum)
TurboXS RFL BOV

I'm hoping to get as close as I can to 300 WHP. Dyno is on the 27th; I don't know if I'll be ready though.