just recently, my car hasnt been running the same. i got my s300 tuned back in december when it was 40 degrees out and now that spring is here, im wondering if the winter tune isnt accepting the warm weather very much. it seems like the car is running lean. even when fully warmed up, it will hit fuel cut at 5-6 psi @ 4.5-5k. then sometimes it will hit fuel cut at 2500 rpm in 2nd gear going 15 mph.

i checked all my vaccuum lines and they are all snug. am i correct in thinking that the car needs to be re-tuned? do u think the place should give me a free re-tune or should i have to pay for it again?

 

How full is your gas tank?

 

turbo cars need to be tuned atleast every six months (id say once spring/summer,again in fall/winter). You cant tune in cold *** winter weather and expect it to run like a champ in hot *** summer weather.

 

sounds like your hitting your boost cut if its hitting when you boost, did you change anything on the s300.

 

I had a similar problem, mine issue was fuel system was gunked up

 

i changed the fuel filter and it seems to still cut....


my s300 is set up to hit cut at 11 psi....tuned for 9.5. i mean i have aem fuel pressure regulator, walbro 255lph, and 525cc precisions, but with stock rail, which shouldnt be a problem.

i think my wastegate might be bad