mikh338

iTrader: (16)

so i had the car out again last night and it was running great. did a couple pulls and was perfect. then i went to do another pull and it started cutting out horrible at wot. couldnt even get over 5k rpm in 3rd. i have had it out several times this year already with all different temperature levels, so i highly doubt it has anything to do with tune. just had it inspected last week and not a single code came up. now this may sound really stupid and i hope this is the solution but the gas was very low. could it just be something as simple as this? car has newer fuel pump in it and i checked all plug wires all were on fine. car idled perfect and drove normal just fine. any ideas?

mikh338

iTrader: (16)

well now speaking to several more guys, they seem to think it is because of my SD tune. im going to research more into the SD vs. maf setups. i may ditch the SD tune and go to maf, as some guys are telling me SD tunes arent as good and make less power?

JaYZeig

iTrader: (11)

i seriosuly doubt its your tune if its been fine all this time, id be more suspected as to it being plugs and wires being worn out and cannot deliver when the engine is under more stress.

seen this same situation on lots of cars breaking up at high rpm's.

TurbopigB4C

iTrader: (5)

Tape the fuel pressure gauge to the windshield and drive around and if it acts up see if you are losing fuel pressure.

RPM WS6

iTrader: (3)

If the problem is at high rpm only and the engine seems to hit a wall at 5k, you may have some weak valve springs that are floating. If ignition and fuel systems check out fine, then valve springs would be my next guess.

mikh338

iTrader: (16)

well an update. just had the car out with fresh gas and it ran perfect. perfect everytime at WOT and idles perfect and normal driving is right on. no issues whatsoever