Quote:
Originally Posted by 130FeetDeep
Timing pulls from the DME occur because it detects knock and this is a safety reaction. Beyond the safety, timing drops equal horsepower drops. Generally knock will occur if IAT get too hot or back pressure causes high combustion temps. I am pretty sure he can log IAT off the JB4. That said, I am willing to bet the stock downpipes are a big, big contributor. If he logs after he installs the pipes, we can safely assume that was a big part of the problem.
Either way, we can 100% tell if that timing drop was knock by increasing the octane with a few gallons of MS109 or running a few gallons of ethanol. The higher octane is more resistant to knock, so we would be sure. My guess is that 22 psi is too much with an otherwise stock vehicle. You may need downpipes to run that much boost.
|
I follow that, makes good sense. The HP tuners software that I used on a C6 Corvette had something in the log that measured or counted the signals from the knock sensors if I remember correctly. I wonder if some SUNOCO 94 would be worth a try.