Not hitting target boost

GeorgeRex · 12-27-2005, 09:25 AM

Hi All,

I just installed an FP20G and I am running Street Tuner. In the target boost levels I set 18 psi from 3600 to 6800 rpm at 80% throttle position. I increased WGDC to between 75 and 85% in the WG High table from 2000 rpm up. In WG Low table I have set between 60 and 75% from 2000 rpm up. I am running a modified Stage 2 Street Tuner map (Stage2 V110).

I have reset the ECU and installed both a base map and a real time map with these new parameters. After three extended shakedown runs (4-5 miles), I cannot get boost over 15.5 psi (indicated by Defi BF) in any gear. In the logs Absolute Pressure comes in at 29-30 psi which also suggests that boost is around 15 psi since I am at sea level. DAM is at 1.0. Timing looks decent with values between 22 and 28 in the upper rpm ranges at WOT. I am running Nismo 720cc injectors so the scaling may not be perfect yet (I am using 3300 in the Injector Scale field) but the AF learned is -5.

I adjusted the wastegate actuator myself so I am pretty sure that it is correct. FP said that the actuator is a 15 psi model. I used the existing vacuum/boost hose routing from the VF-39 but I trimmed the hoses to equalize the tee lengths between the compressor discharge connect and the wastegate actuator connect.

There are no exhaust leaks that I can detect and boost production up to the 15 psi limit seems healthy in all gears.

Any thoughts on the problem? Software or hardware?

**M.S.P.T** · 12-27-2005, 01:55 PM

what hoses are you using for the wastegate solenoid going to the turbo. is the pill still inside the hose??also use the high waste gate duty settings and keep the low wastegate duty settings 3-5% lower then the high setting..

dave

GeorgeRex · 12-27-2005, 02:36 PM

Quote:

Originally Posted by M.S.P.T

what hoses are you using for the wastegate solenoid going to the turbo. is the pill still inside the hose??also use the high waste gate duty settings and keep the low wastegate duty settings 3-5% lower then the high setting..

dave

Good call, MSPT, thanks. I had to install this turbo twice because the first one was defective so I forgot I had changed the wastegate hose setup to fit the nipple on the compressor discharge side and I left out the pill. Testing will have to wait - it just started snowing and I have the summer tires on

STirish · 12-29-2005, 03:17 PM

Quote:

Originally Posted by M.S.P.T

what hoses are you using for the wastegate solenoid going to the turbo. is the pill still inside the hose??also use the high waste gate duty settings and keep the low wastegate duty settings 3-5% lower then the high setting..

dave

Other way around, use the WGDC Low and keep the high just a little above. The Low table is what the ECU is using for the most part.

Rob

ride_the_pony69 · 02-10-2006, 01:08 PM

Yeah is there suppose to be a little restricter in the hose going to the turbo side from the boost solenoid? I have the perrin ebcs and I don't know if it's suppose to have one or not. I am only hitting 15psi when I used to hit 20-24psi.

GeorgeRex · 02-11-2006, 06:33 AM

The restrictor has to be in. As soon as I put mine in, boost went up with no change in the ST settings.

ride_the_pony69 · 02-17-2006, 01:00 PM

Quote:

Originally Posted by GeorgeRex

The restrictor has to be in. As soon as I put mine in, boost went up with no change in the ST settings.

Well the guys at perrin said that the little restrictor is not suppose to be in when you run a ebcs in interrupt mode.

12-27-2005, 09:25 AM	#1
GeorgeRex Junior STI Driver Posts: 186 Join Date: Feb 2004 Trader Rating: (0)	Not hitting target boost Hi All, I just installed an FP20G and I am running Street Tuner. In the target boost levels I set 18 psi from 3600 to 6800 rpm at 80% throttle position. I increased WGDC to between 75 and 85% in the WG High table from 2000 rpm up. In WG Low table I have set between 60 and 75% from 2000 rpm up. I am running a modified Stage 2 Street Tuner map (Stage2 V110). I have reset the ECU and installed both a base map and a real time map with these new parameters. After three extended shakedown runs (4-5 miles), I cannot get boost over 15.5 psi (indicated by Defi BF) in any gear. In the logs Absolute Pressure comes in at 29-30 psi which also suggests that boost is around 15 psi since I am at sea level. DAM is at 1.0. Timing looks decent with values between 22 and 28 in the upper rpm ranges at WOT. I am running Nismo 720cc injectors so the scaling may not be perfect yet (I am using 3300 in the Injector Scale field) but the AF learned is -5. I adjusted the wastegate actuator myself so I am pretty sure that it is correct. FP said that the actuator is a 15 psi model. I used the existing vacuum/boost hose routing from the VF-39 but I trimmed the hoses to equalize the tee lengths between the compressor discharge connect and the wastegate actuator connect. There are no exhaust leaks that I can detect and boost production up to the 15 psi limit seems healthy in all gears. Any thoughts on the problem? Software or hardware? This ad is not endorsed by this member. Please register or login to hide this ad.

12-27-2005, 01:55 PM	#2
M.S.P.T Authorized Vendor Car: 97 gc8 Posts: 252 Join Date: Sep 2003 Trader Rating: (3)	what hoses are you using for the wastegate solenoid going to the turbo. is the pill still inside the hose??also use the high waste gate duty settings and keep the low wastegate duty settings 3-5% lower then the high setting.. dave

02-10-2006, 01:08 PM	#5
ride_the_pony69 Spec C Club Car: 04 Blue STi Location: Sierra Vista, AZ Posts: 1,417 Join Date: Jan 2005 Trader Rating: (1)	Yeah is there suppose to be a little restricter in the hose going to the turbo side from the boost solenoid? I have the perrin ebcs and I don't know if it's suppose to have one or not. I am only hitting 15psi when I used to hit 20-24psi.

02-11-2006, 06:33 AM	#6
GeorgeRex Junior STI Driver Posts: 186 Join Date: Feb 2004 Trader Rating: (0)	The restrictor has to be in. As soon as I put mine in, boost went up with no change in the ST settings.