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11-28-2012, 02:56 PM | #1 |
Scooby Specialist
Member#: 232458
Join Date: Dec 2009
Chapter/Region:
SWIC
Location: Las Cruces/El Paso
Vehicle:2005 & 2008 STi Cobb 20g & EFR 7670 |
Strange RPM Cut/Rev limit issue
So I'm tuned on Open Source and I'm currently retuning on the Cobb AccessPort. In OS we were able to rev out to 7250 before the car stops revving (seems like a cut/limiter is being hit).
Now fast forward to Cobb Accessport tuning. Same base map, but the car stops revving at 6500rpm Makes no sense. If I have a mechanical problem I can understand not being able to rev past 7250rpm in both OS and Accessport...but what's up with the Accessport not letting me rev past 6500rpm? There's a 750rpm difference, but the base tune is the exact same. I have all of the same limits, dtc turned off, everything matches up with the open source tune. Tuning Speed Density Rev limit set at 7500rpm Boost limit 32psi Launch Control turned off FF Shifting turned off Mods: Built SB Stock heads Full Race twinscroll kit I changed and regapped my plugs. Cleaned the Crank sensor. I'm not out of fuel. Heck, when I free rev in neutral it still cuts at 6500rpm. Don't know what else to look for at this point. ***I posted this in the Tuning section as well. I think the 750rpm delta between OS and Cobb AP may possibly be tune related while the hard limit (7250rpm) may be hardware/mechanical issues.***
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11-28-2012, 04:44 PM | #2 |
Scooby Specialist
Member#: 330625
Join Date: Aug 2012
Chapter/Region:
NESIC
Location: MA
Vehicle:2006 WRX WRB |
Is it acting like a fuel cut limiter (ie wideband going nuts, not much popping), a spark cut limiter (ie, wideband going nuts, loud popping), or a throttle limiter (wideband stays kind of normal just sounds and acts like you eased off the throttle)?
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11-28-2012, 05:02 PM | #3 |
Scooby Specialist
Member#: 232458
Join Date: Dec 2009
Chapter/Region:
SWIC
Location: Las Cruces/El Paso
Vehicle:2005 & 2008 STi Cobb 20g & EFR 7670 |
By your explanations it's throttle limiting. Wbo2 is solid until I let off. Load drops of course, feels like it stops making power. It'll overrun up to 7k but stable off at 6500. I'll post a log
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11-28-2012, 05:30 PM | #4 |
Scooby Specialist
Member#: 232458
Join Date: Dec 2009
Chapter/Region:
SWIC
Location: Las Cruces/El Paso
Vehicle:2005 & 2008 STi Cobb 20g & EFR 7670 |
The only thing I see is on the Y-Axis for RPM on the throttle map that it's scaled to 6800. But I believe the AP will use the last cell for anything past 6800rpm...so it shouldn't matter
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11-30-2012, 10:44 AM | #5 |
Scooby Specialist
Member#: 232458
Join Date: Dec 2009
Chapter/Region:
SWIC
Location: Las Cruces/El Paso
Vehicle:2005 & 2008 STi Cobb 20g & EFR 7670 |
Update: So the longer than I hold the throttled down the more violent it gets, bucks but no knock!....and afr does go crazy. I logged TPS, APS, Inj pw. Ill look at the log in a bit. Thinking its a fuel/spark cut now
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12-01-2012, 05:57 PM | #6 |
Scooby Specialist
Member#: 136296
Join Date: Dec 2006
Chapter/Region:
TXIC
Location: Midtown, Houston, TX
Vehicle:2005 STi OBP |
might have more luck in the tuning forum
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12-02-2012, 12:25 PM | #7 |
Scooby Specialist
Member#: 232458
Join Date: Dec 2009
Chapter/Region:
SWIC
Location: Las Cruces/El Paso
Vehicle:2005 & 2008 STi Cobb 20g & EFR 7670 |
Thanks. I have a thread there as well
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12-02-2012, 04:47 PM | #8 |
Scooby Specialist
Member#: 245218
Join Date: Apr 2010
Chapter/Region:
South East
Location: FL
Vehicle:2013 STI Limited |
There is another table that has to be adjusted when raising the rev limiter using Cobb ATR. If you go to their site and review the advanced tuning document this is reviewed in detail.
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12-03-2012, 03:57 PM | #9 |
Scooby Specialist
Member#: 232458
Join Date: Dec 2009
Chapter/Region:
SWIC
Location: Las Cruces/El Paso
Vehicle:2005 & 2008 STi Cobb 20g & EFR 7670 |
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12-04-2012, 10:35 AM | #10 |
Scooby Specialist
Member#: 179014
Join Date: May 2008
Location: Oklahoma City, OK
Vehicle:'06 WRX/STi Built Motor/6766/E85 |
Ive been fighting the exact same problem for awhile now, but im using OS. About a year ago when I had a 20G on the car, I could rev as high as I wanted to. Once I started doing bigger turbo setups, thats where it started. It just doesnt go past 7000rpms whether im in neutral or in gear. All the DBW settings are exactly the same as when I had the 20G. Its starting to get me pretty stumped.
Last edited by banshee04; 12-04-2012 at 06:34 PM. |
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