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Old 02-04-2004, 10:52 PM   #1
Brian Broz
Scooby Specialist
Member#: 13783
Join Date: Dec 2001
2008 2.5i Slow

Default 10psi at 3500 sometimes at 4000? What the?

Sorry I can't post any logs (no laptop) but I have tried 3 different stage 4 maps (i have an SR40)...

For example running the TXS Base Stage 4 FMIC map (Closed loop) some days I get 10-12psi at 4000rpms in 3rd, and other days I hit 15psi at 3800rpms...same map!

Soes anyone have any suggestions where to start...Ok I need a laptop, but what should I look for...I know the SR40 is a bit of a slow spooler, but I have boost gain set at 45 and am using the ABC. I have an MBC (not installed)...should I switch to open loop and try that for a while?

Just looking for suggestions, as I'm taking my car in for service...I suppose I'll ask them to check the MAF and 02 sensor. Maybe we should check for leaks or a loose EGT bung.

It just seems to be worse lately....hoping someone can help a noob fool (ya that's me).


Brian Broz
PS- I have bottomed out on a couple driveways/park lot exits at low speed. Could this be enogh to knock something out of whack on the exhaust?
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Last edited by Brian Broz; 02-04-2004 at 11:09 PM.
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Old 02-05-2004, 11:26 AM   #2
Citizen Mick
Member#: 27646
Join Date: Oct 2002
Chapter/Region: NWIC
Location: Portland, Oregon
2003 Sleeved 2.5
Oil Dry Sump Goodness


Slow spool could be related to what you have already mentioned but typically it's down to running too rich during spool up. What are your AFR reading at the lower rpms and at lower boost?

If you are dropping to 10:1 during spool up then your turbo is going to fill laggy
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Old 02-05-2004, 05:16 PM   #3
Scooby Specialist
Member#: 13704
Join Date: Dec 2001
Location: Chester Springs, PA
2006 EVO MR
Apex Silver


Here's my suggestion without looking at your map or logs...

-- Borrow Lap top and start logging.....

-- Change you boost map to 500 upto 3000 RPM and see what happens......... Reduce the 500 gradually upto 4000 RPM and set fixed value (whatever number that will give you max boost of your goal) all the way to redline from 4250 to 7000........ ( I am hoping that you will write down the boost level and alter accordingly...)

-- Alter Fuel Map based on the logs (knock occurences) from UTEC.... ( I am assuming you would write down the boost level of every RPM up to the FULL Boost and compare that with VF30 or whatever TXS map is based on. Then, if your boost level is less, Reduce the fuel as long as you don't get any KNOCK : I am thinking this will lean a little and help you spooil a little better...)

-- Alter Timing if necessary..........
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