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Is your car breaking up/bucking at high rpm?
i see threads on here all the time about people having issues on different engine management setups with their car braking up under wot at high rpm. well, i found this today on the aem forums and figured it might be worthwhile to mention it on here.
While tuning a friend's car, a cutout appeared at heavy throttle. It wasn't just any old misfire, it would cut out and buck violently briefly, then come back. I checked the overboost cut, and that wasn't it. I checked injector times, dwell, and timing, no probs. I noticed that RPMs dropped very very sharply right when the cutout happened. Not physically possible. Suspicious, I logged timing errors from the advanced cam/crank screen. There was a sudden jump in timing errors right when the cutout happened. I then looked at the crank sensor gap (to the teeth). It was fine. I figured it must be some electrical noise. Now what electrical noise would increase with load? Ans: ignition coil generated noise, due to the increased spark voltage requirements at increased load. Looking at the cam sensor wiring, it passed near the ignition *primary* wires. I separated them, problem solved. just wondered if anyone has tried this on the tc's wiring harness? |
only time i have this problem is from being to rich up top.
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man im sufferin that issue as we speak... Im able to part throttle it to redline but not able to WOT
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trace back the wires and give it a look. can't hurt to try.
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o im on it.... I remembered zip tie'n sum ish together to try to "clean up" the engine bay and I may have zip tied those wires together.
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Mine doesnt do that but this is good to know as a reference point
Sent From My Evo |
Originally Posted by mmmpshh
(Post 3817347)
o im on it.... I remembered zip tie'n sum ish together to try to "clean up" the engine bay and I may have zip tied those wires together.
Resistor mod, or tune. |
We figured that out right mike lol M=TUNED FTMFW!
Sent From My Evo |
never tried that brett, just added ye old resistor and problem solved. Though at higher boost I did experiance exactly what you had issues with before brett.
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wow, I have been experiencing this problem for a while now. I swapped coils with my wife's tC, changed sparks, performed two boost leak checks, swapped injectors, etc. After all of that I just blamed it on the FIC, but couldn't find the problem. I'll try shielding the wires to see what happens.
For me it's mostly felt at part throttle at low psi between 3k and 3.6k rpm's, at wot it's not as bad (although it varies, sometimes it falls on it's face) but def visible on a log. |
Originally Posted by crush02342002
(Post 3817929)
never tried that brett, just added ye old resistor and problem solved. Though at higher boost I did experiance exactly what you had issues with before brett.
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Originally Posted by johnnyb305mia
(Post 3817551)
We figured that out right mike lol M=TUNED FTMFW!
Sent From My Evo ...umm "thendawg" hooked me up with that mod already... almost two years ago |
Originally Posted by crush02342002
(Post 3817929)
never tried that brett, just added ye old resistor and problem solved. Though at higher boost I did experiance exactly what you had issues with before brett.
exactly, its at high boost for me too |
not sure if its a fuel cut though, just the way you had described it before sounds like what i delt with at anything above 16psi. afrs were dialed in but im guessing it was either spark or knock issues. car didnt buck but felt alot like what happens when you dont have the resistors in on the fic.
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if i put resistors in the fic will i need to have it returned or does it not effect the tune?
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Originally Posted by mmmpshh
(Post 3818618)
...umm "thendawg" hooked me up with that mod already... almost two years ago
Sent From My Evo |
Originally Posted by skinnayyy
(Post 3818899)
if i put resistors in the fic will i need to have it returned or does it not effect the tune?
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im havin a similar problem, at WOT it "bogs" down before redline
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I had some similar symptoms, but for me it was from using a ribbed Spectre intake extension tube that I plumbed into the fender wall to try to lower IATs on a pull through set up. When I smashed the gas pedal down the car would seriously bog because there was too much turbulence at the MAF. I've since switched over to a blow through set up and have been doing well ever since. *Running the APR X1
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i just put a turbonetics and fic in my 07 tc. i need help with the maps can anyone help with the ignition map and o2 map so i can get it running good enough to get to a dyno
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