93 Octane OK for Stock B5?
#12
Well.. preignition is not the same as detonation.
'Knocking' is detonation and is what your ECU compensates for. Preignition snaps rods and there's nothing your ECU can do.
Best thing is to test lower octane on a hot day under load (up hill at 3/4 throttle, dragging brakes, etc). If you hear it ping, use a higher octane all the time. If not, your ECU can adjust sufficiently and you prolly can go lower. If there's even a hint, stick with premium. For every ping you can hear, there's more cant.
'Knocking' is detonation and is what your ECU compensates for. Preignition snaps rods and there's nothing your ECU can do.
Best thing is to test lower octane on a hot day under load (up hill at 3/4 throttle, dragging brakes, etc). If you hear it ping, use a higher octane all the time. If not, your ECU can adjust sufficiently and you prolly can go lower. If there's even a hint, stick with premium. For every ping you can hear, there's more cant.
Thread
Thread Starter
Forum
Replies
Last Post
GWerks
Archive - Engine/Performance Parts
0
03-17-2011 11:50 PM