MongoCobra Posted August 15, 2012 Report Share Posted August 15, 2012 I recently brought my 2010 GT500 to the speed shop to get a few dyno runs, figuring it was a good idea after installing the VMP elbow, lower temp thermostat and Magnaflow catback. Last year when I brought it to the dyno the best pull was 529 to the wheels and A/F pegged at 11.5, very respectable with a VMP tune and smaller pulley. Best run this time was 486 to the wheels and th A/F was all over the place during the run, from 12-10. The car did overheat once since the 529 pull so I'm afraid that some real damage was done. I've been racking my brain trying to think of what could have thrown off the tune. Temp and conditions were about the same and it was the same dyno. Could it have been the muffler swap? Maybe the cats are clogged? I think I'm going to take it for a custom tune maybe that will fix the issue. Hasn't been fun driving around knowing that I'm not getting all the power that I can. Anyone have any ideas? Thanks Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.