VanWilder
forum member
Well to start off the car is running fine...but yesterday I went to my local performance shop to get a dyno tune to get ready for our local Midnight Drags tonight. I currently have a tune from Chris Rose at American Muscle. It made decent power but was down quite a bit from where I should be. Last April, I believe, I dyno'd at 328rwhp/306rwtq on this tune with A/F right at 12.9-13.0 out the tail pipe on a DynoJet...yesterday I strapped it on a dyno again (DynoJet but at different place)...and with no changes made to my tune I only put down 306rwhp/289rwtq at 13.80s A/F...so of course I was very confused as to why my car lost so much power with no changes...but we continued to try to tune the car and make the power it should...after 4 hrs of dyno tuning the most we could get out of the car was 308rwhp/306rwtq with A/F in the 12.70s...we messed with adding fuel and subtracting fuel with no luck...we messed with timing adding and subtracting again with no luck...i'm at a loss...what could cause this?! any help is greatly appreciated...
side note: we thought maybe I fouled a plug so I pulled them but dont know how to read these damn HT0s...maybe new plugs are needed...maybe a bad coil...how can you check the coils?! Also while at WOT fuel pressure was at a constant 40psi...is that where it should be?!
Sorry for all questions just wanna get this figured out
And just for clarification this tuner has done numerous mustangs and another car that I know of with the exact same mods as me and made 349rwhp/330rwtq so I know he can tune the car.
-Lance
side note: we thought maybe I fouled a plug so I pulled them but dont know how to read these damn HT0s...maybe new plugs are needed...maybe a bad coil...how can you check the coils?! Also while at WOT fuel pressure was at a constant 40psi...is that where it should be?!
Sorry for all questions just wanna get this figured out
And just for clarification this tuner has done numerous mustangs and another car that I know of with the exact same mods as me and made 349rwhp/330rwtq so I know he can tune the car.
-Lance