lil_z_33 Posted July 18, 2011 Share Posted July 18, 2011 Mods: rotated mount gt35r rotated manfold perrin intercooler custom intercooler piping snow performance water meth kit custom 3" intake ID1000 injectors stock internals opensource tune 1/4 mile last two times I was out was in the evenings, never trapped under 110mph...temperature was like 15-25 degrees celcius today was blazing hot at the track, 42 degrees with the humidity... first pass was like 108mph, then 98, then 91...car was pulling timing and boost like crazy in every gear except first...seemed like my subaru was the most greatly affected by the heat... any suggestions or ideas on how to start correcting this? I have noticed even during daily driving it is doing the same, but not as bad...i tried spraying more water meth, but it seemed to not help much or make things worse...my car was tuned at the end of october 2010, and it was pretty damn cold then... Link to comment Share on other sites More sharing options...
bnguyenbb6 Posted July 18, 2011 Share Posted July 18, 2011 I'd be worried about a boostleak or castrophic failure. Even if you hot lap it, your traps should not drop 10mph. You are already getting great chemical cooling from the meth. Link to comment Share on other sites More sharing options...
NSFW Posted July 18, 2011 Share Posted July 18, 2011 Need data logs. That's a pretty big loss of power, so I lean toward the boost leak theory. But without logs it's impossible to say. Did you run Learning View at all between races? My car will still trap about 100 with a small boost leak, so I think there's more to it than just heat. Link to comment Share on other sites More sharing options...
lil_z_33 Posted July 18, 2011 Author Share Posted July 18, 2011 no logs at all...I need to learn how to do that... the one thing I did notice was my intercooler pipes remained hotter for much longer then everyone else that was there with me... Link to comment Share on other sites More sharing options...
kongzilla Posted July 18, 2011 Share Posted July 18, 2011 spray some cryo2 on intercooler. Link to comment Share on other sites More sharing options...
bnguyenbb6 Posted July 18, 2011 Share Posted July 18, 2011 If you have a boost leak and you are measuring boost at the compressor, it will work much harder to attain your boost levels, increasing your IAT going into the manifold and EGT's. Just food for thought. Link to comment Share on other sites More sharing options...
lil_z_33 Posted July 18, 2011 Author Share Posted July 18, 2011 I have zero knowledge of datalogging, will the tables show symptoms that will point to a boost leak? Link to comment Share on other sites More sharing options...
bnguyenbb6 Posted July 18, 2011 Share Posted July 18, 2011 Go to rom raider and get a learning view.it should show pulled timing and afr. Link to comment Share on other sites More sharing options...
SSpeed Posted July 18, 2011 Share Posted July 18, 2011 My guess is some serious timing being pulled... how did you know timing was being pulled if you haven't logged it? I assume you have a boost gauge? Possibly you were "limp-moded" to wastegate pressure, totally clueless on how thats work with an external wastegate? Aren't IATs measured pre-turbo? Link to comment Share on other sites More sharing options...
iNVAR Posted July 19, 2011 Share Posted July 19, 2011 Aren't IATs measured pre-turbo?Yep. Link to comment Share on other sites More sharing options...
bnguyenbb6 Posted July 19, 2011 Share Posted July 19, 2011 IAT is measured by your maf sensor but if your turbo is working harder, your IAT's that are actually going to your motor are much hotter than said. Link to comment Share on other sites More sharing options...
iNVAR Posted July 19, 2011 Share Posted July 19, 2011 Heatsoak will also raise actual/real IAT post-turbo, but it won't register on the IAT sensor when logging. Pretty annoying. Link to comment Share on other sites More sharing options...
bnguyenbb6 Posted July 19, 2011 Share Posted July 19, 2011 Traps shouldn't drop from 110 to 91 from just heatsoak Link to comment Share on other sites More sharing options...
TRSCobra Posted July 19, 2011 Share Posted July 19, 2011 ^^^ With a rotated GT35, traps should be a bit faster than 110, also... Link to comment Share on other sites More sharing options...
iNVAR Posted July 19, 2011 Share Posted July 19, 2011 Woah now, didn't say that heatsoak was responsible for his drastic loss in performance. Just pointing out the obvious, and also so that he realizes when he datalogs that looking at the IAT column won't be super useful. Link to comment Share on other sites More sharing options...
lil_z_33 Posted July 19, 2011 Author Share Posted July 19, 2011 The 110's were all ran on two completely different nights where temperature was like 20 degrees celcius. The 91mph trap was yesterday afternoon on the hottest day of the year. As the car heats up, the rpms start to stutter at wot and i feel boost cut and in and out power. Boost gauge and meth gauge are up and down like crazy as meth is based off of injectors and boost. I got a tactrix cable today. Will log on wednesday. Link to comment Share on other sites More sharing options...
NSFW Posted July 19, 2011 Share Posted July 19, 2011 I have zero knowledge of datalogging, will the tables show symptoms that will point to a boost leak? If you have a boost leak, it will show lower-than-normal boost and a richer-than-normal AFR when you're at full throttle. It's worth taking some time to learn how to log - it's the best tool we have for diagnosing problems like yours. Link to comment Share on other sites More sharing options...
bnguyenbb6 Posted July 19, 2011 Share Posted July 19, 2011 I'm sorry, I meant that traps should not drop from 108 to 91 after a few passes.you shouldn't be trapping 91 at all. Any coolant loss lately? Link to comment Share on other sites More sharing options...
bmx045 Posted July 19, 2011 Share Posted July 19, 2011 91mph trap with a gt35r Link to comment Share on other sites More sharing options...
lil_z_33 Posted July 19, 2011 Author Share Posted July 19, 2011 to put it all in perspective. The shitty times were ran at approximately 107.6 degrees Fahrenheit. with over 80% humidity. I'm not sure how much of an affect it will have, but I find the hotter it is outside, and the longer the drive, WOT and high boost causes stuttering and the rpms do not rise smoothly. is romraider the way to go to datalog? what parameters should I log? Link to comment Share on other sites More sharing options...
bnguyenbb6 Posted July 19, 2011 Share Posted July 19, 2011 I'm in Texas, its always hot. Last night, it was "cool" at 90*(at night). You should not be dropping from 108 to 91. That is hypothetically/roughly 170chp loss. My vf39 with terrible top end and a small boost leak still trapped 101 in 100* weather with a 2.4 60'(no launch,very much babying it). You could follow the general log that nsfw posted on romraider. http://www.romraider.com/forum/viewtopic.php?f=33&t=5384 I would however, start looking mechanically for stuff. To be frank, I'd be worried. A boost leak should not drop traps that much, neither should heatsoak. My stage 2 LGT was trapping 97ish with the same babying 2.xx 60' launch. back to back runs, my traps never varied by more than +/-1 Link to comment Share on other sites More sharing options...
joeleodee Posted July 20, 2011 Share Posted July 20, 2011 Mods: rotated mount gt35r rotated manfold perrin intercooler custom intercooler piping snow performance water meth kit custom 3" intake ID1000 injectors stock internals opensource tune no logs at all...I need to learn how to do that... . I have zero knowledge of datalogging, will the tables show symptoms that will point to a boost leak? Surprised it hasn't been asked yet. How do you have a mod list like that tuned back in October and not know how to datalog nor have any since this vehicle was initially tuned? Don't take this the wrong way and let this be a lesson to others; datalogging is of utmost importance when modding these vehicles. There's great info here on this site that you have been pointed to. Also, I would think that a well tuned LGT with a rotated GT35r and meth should trap not above 110 mph, but well above 110. Perhaps somewhere in the 120 range. Maybe I'm confused. Who tuned this vehicle? Link to comment Share on other sites More sharing options...
LosAngelesLGT Posted July 20, 2011 Share Posted July 20, 2011 ...and why didn't they tell you to log??? (Or did they?) Ooof... OP I hope everything is cool but I've got a bad feeling. Link to comment Share on other sites More sharing options...
lil_z_33 Posted July 20, 2011 Author Share Posted July 20, 2011 The car trapped at 117 a month ago. Also remember ive only ever been to the strip 3 times total. I was not told to datalog at all. I dont think it is too late to start. Link to comment Share on other sites More sharing options...
LosAngelesLGT Posted July 20, 2011 Share Posted July 20, 2011 Never too late!!! Im just hoping that you have no mechanical issues brohan: I would rather see you have an easy cheap fix than an expensive hassle. Read this: http://legacygt.com/forums/showthread.php/using-autonostics-vag-com-cable-read-flash-ecus-110768.html http://legacygt.com/forums/showthread.php/using-ebay-vag-com-cable-datalog-96737.html Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.