to elaborate on that comment, im a friend of the OP and helped him during install of the kit FYI.... the modified piping was done when the original owner of the kit made it fit in a 2006 model 350z ... i believe the crossover pipe was moded if im not mistaken (OP verify this) was bent or modified to fit the 06 model..... this is a bit of info ill let the OP fill in the rest.... maybe its an issue maybe not!

 

Im with James on this, he and I have both spoken at length over this issue trying to make more POWER, both him and i have the 1.06 housing piping is too small, should have been 3.5. IAT screams due to the 2inch out on the turbo charge side. Since we had last talked i bastardized the hell out of the kit, did the above and only got to 590rwhp on mustang dyno. That's with wastegate plugged, closed, wastegate straight dumps, sp dump off downpipe, 3.5 inch tubing on all sides of turbo, 850cc Methanol50/50, with DC Headers JWT S2 cams, CO2 sprayer on intercooler, ceramic coated everything, in hindsight if i hadn't had soo much downtime and a mandrel bender i probably would have just sold the damn kit. This was with -6 F ambient temp.

this is my 20psi map, not all that aggressive timing, with Haltech and UPRev used to tune, Uprev For IAC and Throttle response after the massive methanol shot. Max Power was 6700
Trying to find my last map, but wouldn't be a fair comparison
Summary of Specs are
1.06 housing
3.5" Piping
SP Cutout
3" out on inlet side of turbo
Jwt S2 Cams
Wastegate Dump
850cc Methanol
O-ring'd Heads
Ported Heads
Pan-evac System to stop blowing valve cover gaskets

 

^is your xover pipe still 2", or did you change that as well? The BP kit uses a 2.5" xover but still exhibits similar issues.

Doesnt seem headers are the trick either...

Do you cut off the rpm axis on purpose in your charts? Seems like all your dynos charts you post come out that way.

 

To clarify the piping issue A couple of the pipes were modified slightly to fit an 06. The area around the steering rack was slightly bend aswell as a small section of the down pipe. Nothing major but some small indentations on the piping.

If the piping is restricted as it is I'm more than positive these slight bends in piping do affect it even more but if many others are still having trouble making more power w the unmodified piping I didn't think much of mentioning it. I should have though. It would help in the process of elimination.

 

crossover pipe is 2 3/4 it wouldn't make any sense for 3.5 for low end spool, but it did seem to help since that is what i started with, if i was to do it again i would say that the dp being 3.5 helped the most.

Headers were a waste of money, but i cracked stock manifolds

AS far as the rpms always cut off thats how it prints, i have been trying to get them to fix it. For being a tuner he isn't exactly computer literate

 

Car has alot of wholes in it now, can anyone say tubular chasis or atleast in the front

 

did u change the inlet side of the turbo>? what was the size that was supplied? Also which piece are u referring to that is 2"... is it the piping that is off the wastegate that dumps back into rear toward the exhaust?

 

not the inlet on the turbo that is 3inch, the outlet on the compressor housing which goes to charge piping, its something ridiculously small, and uses silicone tubing to get it to 3 inch, so i helped it along and just used a compressor housing that already had one, some modification required, i'd show picks but piping was made of steel and has thus far rusted and is out for powder coating.

The 2" piping is the cross over pipe that connects passenger side to driver-side, my wastegate has a turn down and vents to the atmosphere.

I will get picks when i put it back in and make it presentable. But I warn those who would attempt it that my results yield the simple fact everybody loves TWINS!

 

You are talking about a compressor cover, and is the "E" size. It has a 3" inlet and a 2" outlet, and it is not too small, or it does not create problems as far as flow goes.

Talking to many manufacturers, you can step up to an S compressor cover (4" inlet 2.5" outlet) but there would not be any benefit unless you are boosting more than 30psi. At 30+psi the S cover will start outflowing the E cover.

 

Turbo is Maxed out. Iat at 17 psi was way to high for us to tune for more power. The last time you hit the dyno jet you were running more boost then before and the car was only tuned to 8 psi. Iirc you were runnin 9.5 to10 psi while on the dynojet and 8 psi on my dyno. As far as cam selection we tried to get you to go with the stage 2 bc's but you insisted upon the stage 3's.

 

On methanol, IATs should have been ambient or below - stick that 2nd nozzle on there OP. Might let you tune safely into higher boost...

 

Very interesting points being thrown around. Thanks guys for sharing your experiences and knowledge on the subject.
qqqqball- interest in seeing pics

 

I am sure just by raising your rev limit to 7000rpm tuned you'll find some of your missing hp's.....on your current boost.