Moto Posted August 3, 2018 Share Posted August 3, 2018 Just throwing this out to see if anyone has any ideas, 07 LGT Pro dyno tuned, VF-52, mods, and such. Making 265 AWHP Has a Walbro 255pump. When I fill the car up if feel less responsive. Not the typical snap back in your seat throttle response, Boost gauge looks normal, Fuel pump duty cycle looks good, injectors look good, and the AFR is the same as when it feels right. Any ideas? my next thought is maybe the fuel pressure reg or a pump issue. Link to comment Share on other sites More sharing options...
m sprank Posted August 3, 2018 Share Posted August 3, 2018 Log. It could just be your butt dyno. The OE "wideband" does not read on boost. It defaults. You need to verify AFR and fuel pressure if using the ECM. Link to comment Share on other sites More sharing options...
ehsnils Posted August 4, 2018 Share Posted August 4, 2018 Car is heavier with a full tank than an empty. Link to comment Share on other sites More sharing options...
Moto Posted August 5, 2018 Author Share Posted August 5, 2018 Car is heavier with a full tank than an empty. I was thinking in that direction but a gallon of gas only weighs 6 lbs. so max is about 78 lbs. could be. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
m sprank Posted August 5, 2018 Share Posted August 5, 2018 Its not the weight. But trying to troubleshoot with no data and a vague description based on "feel" is like playing darts sh#t faced. I can go on and on about how I "feel" cars are too slow. Lol. Link to comment Share on other sites More sharing options...
Max Capacity Posted August 5, 2018 Share Posted August 5, 2018 Is this a 5eat or a 5mt ? 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
thatericguy Posted August 8, 2018 Share Posted August 8, 2018 Are you using an AP? Did you check DAM and Fine Knock? Maybe something going on with timing? Link to comment Share on other sites More sharing options...
Moto Posted August 9, 2018 Author Share Posted August 9, 2018 Is this a 5eat or a 5mt ? 5EAT. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Moto Posted August 9, 2018 Author Share Posted August 9, 2018 Are you using an AP? Did you check DAM and Fine Knock? Maybe something going on with timing? I’ll run a log today. I’m at about. A half tank. I’ll have some numbers in a few hours Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
relative4 Posted August 9, 2018 Share Posted August 9, 2018 What are your fuel trims under the various relevant conditions? Have you tested the evap purge valve? Link to comment Share on other sites More sharing options...
Moto Posted August 9, 2018 Author Share Posted August 9, 2018 What are your fuel trims under the various relevant conditions? Have you tested the evap purge valve? I’ll log the trims on the way home. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Moto Posted August 9, 2018 Author Share Posted August 9, 2018 Are you using an AP? Did you check DAM and Fine Knock? Maybe something going on with timing? Fine knock was 0.0 under normal driving conditions. Ie. with traffic. Under mid to hard acceleration it would hit -1.4 and then back to 0.0. Under decel 0.0 Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Moto Posted August 9, 2018 Author Share Posted August 9, 2018 What are your fuel trims under the various relevant conditions? Have you tested the evap purge valve? As for the Evap purge valve. Where is it and how can I check it. Thanks for the input Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
relative4 Posted August 9, 2018 Share Posted August 9, 2018 First, I would check for any pending P04xx codes. You can get the 2007 FSM here: http://legacygt.com/forums/showpost.php?p=4487789&postcount=359 The document for your engine is 3 ENGINE 2 (H4DOTC) SECTION.pdf I would remove the valve and verify it seals when closed and opens when you apply 12V across it. Link to comment Share on other sites More sharing options...
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