Posted my dyno graph in another thread, the results were 498 RWHP and then it fell on it's face after 4700 RPM. The dyno guy says the issue is the EBC, which is a Greddy Profec B Spec 2. All my units below are in PSI instead of the default kPa. In Greddyspeak, 9.0 PSI = 90, 15.0 PSI= 150.

The thing has "LO" and "HI" modes, and allows the following inputs:
SET: Expressed as a percentage, this is the duty cycle of the solenoid valve and is used to set the desired boost pressure.

GAIN: Expressed as a percentage, this is used to adjust the boost consistency. (I noted that my problems is here as if the gain is too low, the boost falls off at high RPM)

START BOOST: (Shown as "Set Gain" on the display, also called "set boost") Expressed in PSI, this is used to adjust the boost response.

WARNING: Expressed in PSI, this is an alarm that sounds when boost reaches the warning setting.

LIMITER: Expressed as a percentage, this is used to lower the boost when the boost exceeds the warning setting.

The only hard data I've found online is from a 3000GT website.

The numbers there were:
LO 29%
Gain 18%
Set boost 80 8.0 PSI
Warning 150 15 PSI
Limiter 14%

HI 44%
Gain 18%
Set boost 80 8.0 PSI
Warning 185 18.5 PSI
Limiter 16%

The poster said lo gave him 12+ PSI & hi gave a "pretty instant" 17 PSI.

My numbers as of the dyno tune were:
LO 25%
Gain 10% Gain too low; manual says to raise if boost falls off @ high RPM
Set boost 5 Appears to be way too low; is .5 PSI
Warning 90
Limiter 88% Appears to be way too high

HI 50%
Gain 20% Gain too low; manual says to raise if boost falls off @ high RPM
Set boost 25 Appears to be way too low; is 2.5 PSI
Warning 150
Limiter 99% Appears to be way too high

There are several differences between that car & mine:
1 more turbo
2 fewer cylinders
3.2 fewer liters of displacement

I know I have an issue with the gain setting as noted above since the boost falls off after 4700. I'm shopping for anyone that is using this on an LT1/LS1 or another EBC to get an idea as to what numbers to use w/o burning up dyno time.

Thanks.

 

sounds like it could just be an issue with your wastegate setup and or turbo sizing.


I need more technical data on that EBC to tell ya more.