I just purchased a supra and it's at the shop having some tuning difficulties...I had originally bought it with a blown HG, it's a 61mm single with a maft pro, 550's, single walbro. It had dyno'd 420whp but supposedly the shop blew it when they raised the boost.
After getting the mhg replaced, it's evident the shop tuned through a problem thus why it blew...The rpm signal to the maft pro is cutting out randomly...So when revving(even not under load), it will hiccup and the rpm signal misses for a split second making it run lean. it will continue to do that randomly
It's got an ffim so they checked the TPS, it's fine...It seems to have been narrowed down to either the maft pro unit itself or the wiring harness. Now, the wiring harness had been redone with some wiring removed by the previous owner - Basically, the shop is saying it's a 50/50 toss-up right now, choose the harness or the maft pro to change out and we can figure out which it is.
Anybody have any input on it?
Thanks
Mark
After getting the mhg replaced, it's evident the shop tuned through a problem thus why it blew...The rpm signal to the maft pro is cutting out randomly...So when revving(even not under load), it will hiccup and the rpm signal misses for a split second making it run lean. it will continue to do that randomly
It's got an ffim so they checked the TPS, it's fine...It seems to have been narrowed down to either the maft pro unit itself or the wiring harness. Now, the wiring harness had been redone with some wiring removed by the previous owner - Basically, the shop is saying it's a 50/50 toss-up right now, choose the harness or the maft pro to change out and we can figure out which it is.
Anybody have any input on it?
Thanks
Mark