hubiturcokov Posted July 2, 2010 Share Posted July 2, 2010 well I have been having major studder/hesitation since my stage 2 install and flash. Mostly in 3rd, 4th and 5th gear in the 3-4.5k rpm rage and when i am off or partial throttle. logs taken at 80 degrees in philly, PA Any help would be greatly appreicated stock intake, turbo, injectors catless up erz highflow cat down Cobb OTS STII 93 mapromraiderlog_20100701_191549.csvuromraiderlog_20100701_184039.csvuromraiderlog_20100701_191549.csvuromraiderlog_20100701_194118.csvuromraiderlog_20100701_195615.csvuromraiderlog_20100701_201814.csvuromraiderlog_20100701_203459.csv Link to comment Share on other sites More sharing options...
bnguyenbb6 Posted July 2, 2010 Share Posted July 2, 2010 http://www.romraider.com/forum/viewtopic.php?f=33&t=5384 Log those values, do a 3rd gear from 2k rpm to redline. Not sure what to tell you though besides "get a real tune". My Cobb OTS tune showed knock like that too. Link to comment Share on other sites More sharing options...
Boostin1657615274 Posted July 4, 2010 Share Posted July 4, 2010 your A/F learning is more than I would expect. With almost exactly the same mods and the Cobb OTS stage 2 (which has since been significantly modified) my trims were much closer to zero. Are you sure there isn't some kind of air leak? You are using actual 93 octane to match the 93 octane map right? On the search for a new DD... Link to comment Share on other sites More sharing options...
m sprank Posted July 4, 2010 Share Posted July 4, 2010 He has something mechanically wrong. A/F is WAY off. Scary off at WOT. Deff have a leak. Link to comment Share on other sites More sharing options...
Boostin1657615274 Posted July 4, 2010 Share Posted July 4, 2010 use a boost leak tester like www.boostpro.net/prodtester.html (universal tester at bottom) you can build your own as well. just install it on the inlet hose after the airbox. On the search for a new DD... Link to comment Share on other sites More sharing options...
hubiturcokov Posted July 4, 2010 Author Share Posted July 4, 2010 Boost Leak Tester (Gauged) 3" Diameter) With Male Compressor Coupler $20 + $4.60 shipping This one? Link to comment Share on other sites More sharing options...
hubiturcokov Posted July 4, 2010 Author Share Posted July 4, 2010 Only thing i could think of doring the install was that the rear 02 sensor was a bitch to get off the original dp and i had someone do it for me and put the new one back on. Link to comment Share on other sites More sharing options...
m sprank Posted July 5, 2010 Share Posted July 5, 2010 As lean as you are at WOT seems like you are pulling in air post MAF. So look at all hoses and connections post MAF/pre-turbo. The inlet tube? Link to comment Share on other sites More sharing options...
SpeedNeeder Posted July 5, 2010 Share Posted July 5, 2010 I looked at the last log and the MAF is bouncing around pretty good. I'll have to look at some of my logs to compare, but that does seem odd. My other car is a 1993 Chevy S-10 Tahoe! (Currently being driven to failure by my nephew) Link to comment Share on other sites More sharing options...
m sprank Posted July 5, 2010 Share Posted July 5, 2010 Something is weird. I would check everything starting at the air filter. Look for loose connections, popped hoses, leaks under worm gear clamps. Then go over the vacuum lines. You can zip tie the ends so you know which you checked. Couldn't hurt. If everything looks good. Reset the ECU and do 1 pull. Just 1, in case. If data looks bad, start looking at gaskets and WG. Link to comment Share on other sites More sharing options...
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