Thread: GTi-r vs. GT28r

My hp recently with gtir t28 at 10psi 280/244,but it should pick up more with more fine tuning of fuel and timing maps

my car is a DE+T and it has JWT S3 CAMS, JWT ECU, Z32 Maf, 370cc injectors, aluminum damper pully & 9 lbs flywheel, 3inch downpipe w/3inch cutout now i live in central america so the fuel where live sucks but in the States it would probably hit 280hp aswell

What's the most boost I can safely run on a bone stock de with a t28? Ill be running a 3" dp, 3" exhaust, 50lb msd injectors, and n62 maf. Trying to make as close to 300whp on stock cams as I can.

Blow torches

You need a wideband to monitor the amount of fuel you have but with enough fuel you can run a gti-r to 18-20lbs on race day. I wouldn't run more than 15-16lbs daily and that is only with a great tune and probably larger injectors. The injectors may hold up to 15 psi but without a wideband you won't be sure. Add an external wastegate and you could run more boost safer and make more power

I run 15lbs daily i have the same setup as you

18-19psi is about what I would consider max for this turbo. There may be other opinions however. Check out the turbo maps to check what is its "theoretical" max

This statement makes no sense!

Injectors are rated for "fuel flow" (or supported HP) NOT "air flow". 15psi out of a T28 IS NOT 15psi out of a GT30R

50lbs are good for a little less than 350 whp at 3bar fuel pressure

MSDs however, do not like to be ran at 4bar fuel pressure

depending on a lot of things, but you should be able to make 300whp out of both turbo at or around 12 psi and maxed out at or around 15-16psi.

IMO, i think getting the 2871 with the S3 cams and a JWT tune with a ported GtiR manifold will be a good set up for 300Hp with no problem. You definitly have to ditch those 370cc injectors tough. I would recommend 740cc or subies 520cc at 4 bar at least..