trouble making power up top...help!?
 

specs: 06 tC

emanage ultimate w/ pressure sensor and support tool
innovate wideband o2 logged and viewed on laptop
MHI 20g @ 7-8 psi (10 psi spring losing a few psi in the core)
log mani
HKS bov
Turbo concepts WG
PWR liquid-to-air intercooler 4x6 core 390cfm max
2.5'' s-pipe with QTP cutout
1 step colder plugs, gaped at .30
93 octane gas

Problem:

Car makes peak torque(222tq) around 3700RPM, then it drops off, steady, at redline im at about 180tq. Numbers seem low to me, judging from some of the other dynos i've seen.

Power peaks at 222 also, just before redline.

Right now im pulling 1 degree of timing from 7 to 8psi, 2 deg to 10.

Anyone who can read a flowchart better than me and able to tell me the cfm im putting out at 8 psi, Here is a chart, wasnt sure what the "pressure ratio" was, its not in bar.
http://www.stealth316.com/images/td06h-20g-cfm.gif

also, here is a crappy cell phone pic of my dyno sheet (sorry scanner is broke)
the "higher" lines are with my cutout open, the lower/less power lines are with my cutout closed
https://i38.photobucket.com/albums/e...1245405445.jpg

Ive seen up to 275whp on 8psi on a similar sized turbo, what gives?

hmm seem like low numbers to me, what are a/f's and i would definitly replace the wg spring if your loosing boost, your obviously loosing power....

Re: trouble making power up top...help!?
 

i think you have your hp and tq numbers mixed up there. :silly:

it holds boost, 7.6-8.4 psi from spool up to redline. just loses power. af/rs are around 12 coming in to boost then taper off to 11ish at redline. most of the boosted area is 11.5

another thing im wondering is why you have 2 step colder plus at 8 psi of boost? put the stock plugs back in and i bet you'll make alot more power.

hmm....i was going to say post a cfm chart but you did but i just see a red x....

Re: trouble making power up top...help!?
 

haha good eye, i do. Ill edit. too much goin on at once.

Well the boost is going up, my ebc will be here monday. gonna try to hit 12psi if my injectors let me. But I do still have some stock plugs I think, would it seriously make that big of a difference?

here is the link, it shows for me. there site may block linking of pics.

http://www.stealth316.com/images/td06h-20g-cfm.gif

at what psi level would u suggest 2 stop colder plugs brett?

i've picked up over 20hp on a mustang dyno from just simply adjusting the gapping on my plugs. try the stock plgs, or re-gaping the ones you have down to about .020 and see what happens.

i'd say anywhere from 18-25 psi.

stock gap is like .038 isnt it? I had the 7 range plugs at .026 but my "tuner" opened them up to around ".030 or so" he said.

rule of thumb i've heard is 1 step colder plug for every 75hp above stock.

well at 18 lbs 2 step should be straight right lol

What is the trims and a/r's of the turbo? Are you sure the intercooler can flow enough CFM internally for the turbo and engine requirements? Also run 1 step colder plug gapped at .28-.31 see what this does for you.

The core flows 390cfm, efficiently, so in theory it can flow more than that, just loses more boost as it passes. Max CFM for my turbo is 640, but I know at my boost lvls im not near that. I just couldnt figure out where im at with my boost lvl on the flow chart lol

I posted a link to a flow chart above. its a standard MHI 20g. Not sure on the trim or a/r without looking it up.

pictures? trying to figure out why you arent making power

what management

emanage ultimate w/ pressure sensor

and I dont really have any pics under the hood, i lost my hard drive not too long ago.

What are you wanting to see? ill try to get some tomorrow.

I know the turbo can make power on my engine, its the same turbo travis uses im pretty sure, the upgrade from the zpi stage 1 kit.

here is a pic of it. only mine is external gate with a 4 bolt hotside flange
http://www.maperformance.com/images/T/t_16966.jpg

More thoughts what kind of dyno was this? What correction method was used? SAE or STD, SAE always shows less but is more accurate to your actual power.