how much ignition advance do chips give?
03-12-2005 | 01:31 AM
#2
Race Car
Joined: May 2003
Posts: 4,045
Likes: 61
From: SoCal
You never really know what you "get" when you buy a performance chip.
Typically, the additional advance should be no more than 3-6 degrees.
Much more and you'll possibly damage the engine the result of detonation.
Even with a small 3 degree additional advance, pinging may occur without
use of a higher octane & possibly be inaudible. The 3-6 degree additional
advance usually results in a noticeable "feeling" to overcome any possible
"buyer's remorse".
I "dumped" the ignition map on a 911 3.2 and found some advance points
in excess of 50 degrees, where the max on a 911 should be less than
36-38 degrees. This performance chip was from a supplier who's been
in business over fifteen years. Not good!
Bottomline: Beware of what performance chips you use. Check out this
web site ( www.andial.com ) on the FAQ page under Question #2, as the
info is most applicable to a 928 with knock sensors.
Typically, the additional advance should be no more than 3-6 degrees.
Much more and you'll possibly damage the engine the result of detonation.
Even with a small 3 degree additional advance, pinging may occur without
use of a higher octane & possibly be inaudible. The 3-6 degree additional
advance usually results in a noticeable "feeling" to overcome any possible
"buyer's remorse".
I "dumped" the ignition map on a 911 3.2 and found some advance points
in excess of 50 degrees, where the max on a 911 should be less than
36-38 degrees. This performance chip was from a supplier who's been
in business over fifteen years. Not good!
Bottomline: Beware of what performance chips you use. Check out this
web site ( www.andial.com ) on the FAQ page under Question #2, as the
info is most applicable to a 928 with knock sensors.
03-12-2005 | 02:07 AM
#3
Thread Starter
Three Wheelin'
Joined: Nov 2003
Posts: 1,577
Likes: 0
From: Los Angeles, CA
somehow I knew you'd be the one to respond with what i was looking for...
Thanks for the info!
Another question... From what I understand, an engine is most likely to ping at the torque peak. Lets say I dialed in 8 degrees of advance at 2500RPM and i could actually hear the engine pinging under load. I lowered that number to 3 degrees and could not hear any pinging (lets say just for the sake of the question that there was NO pinging at all). In general, if my engine doesn't ping at its torque peak with a certain amount of advance, would it be safe to say that I can run that same amount of advance throughout the RPM range (well.. specifically at higher RPMs where it would be useful)?
Thanks for the info!
Another question... From what I understand, an engine is most likely to ping at the torque peak. Lets say I dialed in 8 degrees of advance at 2500RPM and i could actually hear the engine pinging under load. I lowered that number to 3 degrees and could not hear any pinging (lets say just for the sake of the question that there was NO pinging at all). In general, if my engine doesn't ping at its torque peak with a certain amount of advance, would it be safe to say that I can run that same amount of advance throughout the RPM range (well.. specifically at higher RPMs where it would be useful)?
03-12-2005 | 01:09 PM
#4
Race Car
Joined: May 2003
Posts: 4,045
Likes: 61
From: SoCal
"In general, if my engine doesn't ping at its torque peak with a certain amount of advance, would it be safe to say that I can run that same amount of advance throughout the RPM range (well.. specifically at higher RPMs where it would be useful)?"
Not really, the pinging may still exist at other loads & RPMs. The torque peak you
measure using a dyno run occurs at WOT. There still may be other throttle settings
(loads & RPMs) and engine temperatures which may be problematic for the additional
advance. In many cases pinging may not occur until a very hot day combined with
a lower quality fuel than used previously.
Not really, the pinging may still exist at other loads & RPMs. The torque peak you
measure using a dyno run occurs at WOT. There still may be other throttle settings
(loads & RPMs) and engine temperatures which may be problematic for the additional
advance. In many cases pinging may not occur until a very hot day combined with
a lower quality fuel than used previously.
