Fox T-Bird/Cougar Forums

Technical => Engine Tech => Topic started by: 88 Blackbird 5.0 on January 19, 2012, 09:07:02 PM

Title: ECM's Rev Limiter?
Post by: 88 Blackbird 5.0 on January 19, 2012, 09:07:02 PM
I was just reading the "TFS Stage 1 Cam" thread and read Tom's comment about fuel cut out at 6250 RPM's.  I didn't think our ECM's had a rev limiter function.  If they do, does the ECM kill injector pulses so that cylinders are skipped; limiting the RPM's?  I'm just trying to understand how this "fuel cut" function he mentioned works.

Obviously, aftermarket rev limiters skip ignition pulses to limit RPM's.
Title: ECM's Rev Limiter?
Post by: Haystack on January 19, 2012, 09:26:37 PM
Theoredically, the stock computer can only compute up to 6800rpm's, but the cut off is near 6200rpm's. 6250 sounds about right.
Title: ECM's Rev Limiter?
Post by: 88 Blackbird 5.0 on January 19, 2012, 10:07:45 PM
Hmm...  Learn something every day.  I though just like carbed engines will keep on accelerating and blow up if you don't let off the gas pedal, our computer-controlled engines would too.  That's good to know that's not true.