Low boost help

[HUNTJAMES]

My 06 autorotor with a low boost setup. It has been dynoed at 275.1(hp)@7500/ 245.1 (tq)@4450(rpm) with 6.2 (psi). These are stock numbers. My car has 35K miles, DC header, Arc Ti exhaust, Cantrell AIS. It was never dynoed stock so i have no idea of the pre CTSC numbers are, but these arent good numbers! Please help!

[car2n]

I have the same problem, only 2psi and 274hp my setup CTSC low boost new belt, I have no idea what to look for but I will remove SC and check for boost leaks I guess since I search for some type of check list for this type of problem with no luck.
If anybody knows what to check please help.

[jmp]

Please upload your dyno chart. It really displayed 6.2 lbs of boost? What were the A/F's showing? What type of dyno?

[HUNTJAMES]

The A/F was between 12-13.4 -- Second look shows 11.9-12 A/F at WOT
My scanner is on the blink, dyno was done at Jotech in Garland. New 4 wheel dyno, tech had only seen the owner use it and owner is in Vegas!

[angus]

Originally Posted by HUNTJAMES

The A/F was between 12-13.4 . My scanner is on the blink, dyno was done at Jotech in Garland. New 4 wheel dyno, tech had only seen the owner use it and owner is in Vegas!

OUCH , 12-13.4!!! A lot lean.

[Vega$ NSX]

Originally Posted by HUNTJAMES

The A/F was between 12-13.4 . My scanner is on the blink, dyno was done at Jotech in Garland. New 4 wheel dyno, tech had only seen the owner use it and owner is in Vegas!

Was the previous owner named Apple? If so, I think I might know that car.

[lightguy]

Originally Posted by angus

OUCH , 12-13.4!!! A lot lean.

14.7:1 is stoichiometric for auto gas. I can see knocking off one or two to one for FA. Anything more would be rich; no ?


James Hunt; hows the compression #'s.
Are you sure you have 6.2PSI or are those the manufacturers #'s ?

[angus]

Originally Posted by lightguy

14.7:1 is stoichiometric for auto gas. I can see knocking off one or two to one for FA. Anything more would be rich; no ?


James Hunt; hows the compression #'s.
Are you sure you have 6.2PSI or are those the manufacturers #'s ?

It is pretty well accepted that the AFR under boost should be in the 11-11.5 range. Even for an N/A motor 14.7 will be too lean at WOT , 14.7 for idle or cruising is ok .

[HUNTJAMES]

Here's what I got .........More like 11.9-12 A/F range at WOT..........
Asked Tech to see what my Psi was on the 4th run.

[lightguy]

Maybe Jo-tec has a "heart-breaker" dyno not a "feel-good". Probably a Mustang ?
I am going to do a pull on a similar Dyno soon with a NA 91 and so can compare #'s.
In the end its acceleration times that really matter not "adjustable" HP #'s.

Boost pressures look good; about 6.1 Max PSI indicated.

[HUNTJAMES]

I didn't feel comfortable with the dyno results from Jotech, so I went to SNL Performance near Ft Worth to see if Jotechs numbers were true. The numbers are from the SAE/5 scale on a Dynocom dyno in fourth gear. Max HP 292.8 @ 6700(RPM) Max TQ 249.0 @ 4650(RPM) AFR 1=9.9 at 7300(RPM) w/ 6.1 lbs boost! Better numbers but my A/F Ratio is way different. Its gradually gettin to much fuel from 6100-7300 RPM. Is there some way to fix that without going with an AEM EMS?

[ffffanman]

Looks great to me!
Just shift!!!! lol
I'm adding a FIC soon...like 6 months ago.
I'd rather go rich like that anyways.
Rather doubt your losing much h.p. but rather being safe.
Its 10to1 or richer like I am right now that you have to worry about and can feel the loss of power and imagine the fuel scrubbing my piston walls.
Just drive that thing already will ya. lol
Trev