Are you running stock cat/exhaust or aftermarket?

 

I'm not sure if I agree 100% with this comment, at least as it it written. I remember in my Subie days that stock boost on a vf39 turbo was 11-12 psi (pretty sure that turbo is a good bit smaller than than a td05-18. I think other parts of the Greddy kit are holding it back:

1. pretty small downpipe (2.25 ish inches?)

2. pretty small intercooler piping...

3. pretty small inlet piping...

just thinking outloud but getting my vf39 tuned (plus a few other bolt ons: intake, 3 inch turbo back exhaust etc) from 11-12 psi to 18 psi brought me from 240whp stock to 310 whp.

 

IM 10psi AND 301 at the wheels with a low-reading DYNO, and stock CAT

 

I know where you are coming from, but the flow limits of turbo itself can only be analyzed with respect to a specific engine. The CFM limit of the turbo isn't set in a vacuum, rather by the flow characteristics of the engine.

my tuner/shop made a few anecdotal findings from using the kit on a F20 and F22. On the f20c, they believed the CFM limit is reached at around 9 psi. On a F22, they observed 7-8psi CFM limit. This doesn't mean the turbo will not make power after these psi limit; rather, it indicates what the efficiency range is.

If the efficiency range is indeed 7-9 psi depending on whether its a F20/F22, you can see why these large PSIs will not work well with the turbo.

The S2000 engine is a high revving VERY efficient high compression NA motor, and I suspect this is why you are seeing a low CFM limit for the greddy turbo when paired to this motor.

 

i have custom 3 inch downpipe back exhaust with magnaflow cat.. #9 plug

it is a 5th gear pull.. # on dynapack could be different depend on calculation input.. same day 06 civic si made peak 160hp stock 5th gear pull,

 

Does anyone have the Compressor Map for the Turbo being used for this kit available? Is is a Mitsu 18G? Want to do a couple of quick flow calcs...

 

What were your results before you went to a 2mm HG and bigger injectors?

 

also, what does a bone stock ap2 do on this dyno.. the delta is what matters, not the absolute numbers!

 

Don't have base run with this dyno.. i have dyno with dynojet base stock with 209 peak,

tuned 7psi with this dyno made 250 peak and a little less than 200ft/lb,
how ever i don't see much hp increase but i gain alot of torque, i am waiting to have my clutch change and tune to 16psi..

 

very well said