I have an 87 TR with a FAST B2B. Knock sensor's working, ESC is set to 20deg max retard, all the normal good stuff. Strange thing is that, while tuning the car, we saw a bunch of KR on a couple of pulls (14deg), and then the ignition cut out entirely. Totally reproducible: KR climbs up to a threshhold, ignition cuts. If the KR stays under the threshhold, everything runs peachy.
So, the working theory is that, because we have the FAST reference timing set at 6deg, the 14deg is actually acting like 20deg and, when it tries to pull more than that, something throws a fit and shuts down spark.
Anyone know what's going on here definitively? Does the stock GM spark module flip out if you try to pull more than 20deg of timing out of it? Does the FAST B2B box have some safety strategy related to timing that could be causing it?
Thanks for any insights!
So, the working theory is that, because we have the FAST reference timing set at 6deg, the 14deg is actually acting like 20deg and, when it tries to pull more than that, something throws a fit and shuts down spark.
Anyone know what's going on here definitively? Does the stock GM spark module flip out if you try to pull more than 20deg of timing out of it? Does the FAST B2B box have some safety strategy related to timing that could be causing it?
Thanks for any insights!