Originally Posted by
FUBU
did u do a retune of the ECU? maybe that have effected the car somehow. try a re-tune you know works.It might help.
I'm running a tune right now that was set up for a car with my exact mods list... on his, he didn't have any heat-related issues. Having said that, the tune could definitely be dialed in a bit more on a dyno...
Originally Posted by
oledoc2u
Injectors is the only other change...maybe they are the problem. It wouldn't be plugs. Plugs fail period. Although coils can get hot and cause problems as well. Injectors can over heat too... Good luck
I've never heard of injectors overheating... but this failure occurs just cruising around... injectors aren't doing 50% of their duty cycle when this occurs.
Originally Posted by
velociabstract
I'd put the old plugs in just to rule the new ones out. A little work with no cost. The temperature part of the equation has me stumped, no real idea. Do you have a way to read AFR's? I'm thinking your engines running way too rich with the new injectors. The color of the plugs should give you a clue. Especially if they're damp.
Les
This is probably the next step... I just think it's really WEIRD that the problems happened immediately after switching to the new plugs.
Can someone explain the whole "heat range colder" thing to me? If there's no detriment in swapping back to the stock heat range plugs, I'll certainly do that. They're gapped at .36, not .40 like the factory. We gapped them a bit narrower due to the anticipated boost the 61mm pulley would provide.
I can confirm that my car is running RICH. The tail pipes haven't been chrome since the tune was added... and if I hit WOT, there's a "puff" of black smoke for one second as the car hits open loop, then it clears up. I don't have a wideband connected, but the tune I'm running was built for 550 injectors and he was in the high 10's for AFRs...
I know rich is safe (to an extent) but I agree that there is some scaling that needs to be done on the injectors. My confusion is surrounding the temp... If the car was running rich enough to foul the plugs, it would happen at ANY temp, right? Not just 70° and up... This is why I'm so stumped.
Originally Posted by
SparkieSRT6
It would be nice to completely rule out the RCM by swapping with someone for a couple weeks.
Is this failure indicative of a faulty RCM? That would be a quick fix, but I thought the RCM would cause a no-start issue. Car starts fine, it just misfires.
Originally Posted by
Selbyl
What are your intake temps like? I have an N/A and last summer at the drag strip with the stock intake my temps got up to 180 before the car started to act a little sluggish. In Guam it's about 80F everyday and almost 90% humidity.
Intake temps are usually in the "ambient + 35°" range.
We get extremely hot here in TN, summer temps regularly reach 100° F
Last summer I was running the 65mm pulley, stock injectors, stock plugs -- and I could drive in ANY temp, ANY conditions, and not lose power.
Thanks everyone!! Really want to get this sorted.