'07 Mustang Rev Limiter Problem

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08-08-2010
Modern Muscle

'07 Mustang Rev Limiter Problem

I'm having one unusual problem with a 2007 Shelby GT (4.6) Mustang. At wide open throttle in 1st and 2nd gear (Manual Trans), it seems like I'm hitting a rev limiter at 5,500 rpms. I have the rev limiter set at 6400 rpms. When looking back threw the scan, it jumps from 5500 to 6500 at the point I'm seeing the problem. Seems like the clutch is slipping. Is this possible cause? In third and forth gear it pulls right to redline with no problem. Didn't have this problem on the dyno either when doing forth gear pull. What else could cause this problem? Specs are as follows: 2007 Shelby GT (4.6), Paxton 1200 Supercharger at about 12 psi max, 60lb injectors, GT500 pumps, stock Maf in larger housing. I'm attaching my tune and scan to this email. Any thoughts will be greatly appreciated.

P.S. Problem occurs in scan at 4:30 to 4:45 Range
08-09-2010
PSYKOSTEVO

Could definitely be a clutch slip. Kind of odd though that it wouldn't slip from a 2,000rpm pull in 4th gear though.
08-10-2010
Modern Muscle

Quote:

Originally Posted by PSYKOSTEVO

Kind of odd though that it wouldn't slip from a 2,000rpm pull in 4th gear though.

Yeah Steve, I'm surprised it doesn't do it in higher gears either. I can see it not doing it down low because the centrifugal Paxton doesn't start making power until high 4K range and makes peak torque between 5,000 and 5,500 rpms. I have the traction control turned off, but could one of those tables still be causing the issue? Or maybe a table base off anticipated acceleration? RTWD, Justin any thoughts?
08-10-2010
PSYKOSTEVO

Which Paxton kit is this? Intercooled or not intercooled? - NEVERMIND just read kit contents-
08-10-2010
Modern Muscle

It has the Vortech style air to water intercooler. I think Vortech calls it the Mondo cooler.
08-11-2010
Witt

I took a look at the log and can't find anything after 5500 rpm other than what it looks like the throttle pedal being lifted. It might be the framerate of the scanner or I'm just losing my mind but I see ETC being shut after 5500 but the rpms jump another almost 1000 during the shift. I know this sounds obvious but are you sure you aren't just outrunning the factory gauges?
08-13-2010
Modern Muscle

It was clutch slip!

New clutch in. Problem seems to be gone :yay: