Thread: Does this sound about right for the setup???

My friend dynoed his car lastnight, let me hear what you think and also why the car is not running higher boost.

GTiR SR20DET in a U13 FWD
GT2871R @ 18psi
740CC injectors
External Tial wastegate 38mm I think
Cool Mist Water Injection
Greddy Ultimate
3" exhaust but stock J-pipe
Fidanza Flywheel
JWT S3M Cams

Car made 330HP @18psi but the night before it was holding 21psi comfortable on the road tune. What would cause the car to not get the 21 psi on the dyno runs? Is this power good for his setup? I am wondering if the j-pipe is holding back some power being stock and whereabouts can I locate a 3" setup and retain the A/C compressor. He is using the stock GTiR manifold and has an external wastegate welded onto it. Also he just tack welded the flapper on the back of the turbo shut, wondering if on higher boost it is leaking. Let me know your opinions.

I think with proper ignition timing you should have more power, but 330WHP @ 18psi with a GT2871R sounds pretty typical. Absolutely the stock J-pipe is holding it back. Anything you can do to replace it with something higher flow will be great. Keep in mind, a 3" replacement for the J-pipe is almost impossible. You will have to come out of the turbo with 2.25" pipe and then expand that to 3" at some point. You will have to re-do the downpipe. I would refer to this sort of stuff for reference:

http://www.sr20-forum.com/turbo/2460-any-interest-divorced-wastegate-o2-housing-downpipe-combos-13.html#post52348

Might want to read that entire thread to get an idea of what you're up against if you don't want to modify the downpipe.

The internal wastegate may be leaking, but it shouldn't make any real difference at the end of the day. What type of dyno were you on? If it's an unloaded dyno, I can see why you didn't make full boost.

I know someone who made @380 with a similar set up at that boost level.

Hmmmm any thoughts TreyDee as top what can be done to maybe give an increase in the power, and is that with pump gas at 95RON?

What type of dyno?

Not sure on the dyno, all I know is that it's a dynojet. Not sure if that helps.

That could be the reason for the low boost. Dynojets (all but the newest model) are unloaded dynos so it's hard to build boost.

As for the gap in power, I'd say it's in the timing.

I jus dyno'ed yesterday on a dynojet and pulled 202 whp at 7 psi, my boy told me that something is wrong and I should be at @ 240???not sure if its teh dyno or not.

That doesn't sound out of the ordinary for a T2 flange turbo.
It's your boy.

its a

T3/T04S 60-1 Turbo
T04S Compressor Housing with .70 AR, 4" inlet and 2-½" outlet
60-1 Trim Compressor Wheel
Oil-Cooled only
Stage 3 Turbine Wheel
T3 Inlet Turbine Housing with 4-Bolt Outlet, Externally Wastegated, AR ratios .63,
Factory built, VSR balanced