Rev Limiter - Ford Mustang Forum
 
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post #1 of 5 (permalink) Old 07-02-2013 Thread Starter
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Rev Limiter

Talk about confused - 2013 GT 5.0 some Mods 383 Dyno RWHP

Here is what I have been told by Ford Limiter set at 7K however it starts to limit fuel at 6700 - With a tune limiter set at 7200 but could never get close without starting to lose power. This was at the track - 3.13 Gears which I know are not the best for 1/4 mile but stock tires for now so they are fine . Still managed a 12.90 at 110 hitting the rev limiter in the first three gears - had to shift at about the 1100 ft mark into 4th which sucked - So anyone really know how the limiter works and what are the best shift points - Before I spend a ton of money on more mods need a better baseline

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post #2 of 5 (permalink) Old 07-02-2013
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Shifting into 4th in your GT is like shifting into 3rd in an '05-'10 GT. Both are 1.32:1 ratios. So don't fret about having to do it in the 1/4.
WRT the rev limiter, the ECU starts closing the throttle plates approx. 300-400 rpm before redline to prevent the plates from slamming shut whenever rev limiter acrivates, which in turn reduces drivetrain shock.
Installing a tune will allow the rev limit to be raised as you had mentioned. But the limit may have to be increased a lot to prevent the 3-4 shift before crossing the finish line. And that's not good for the engine life if you do a lot of drag racing.
Suggest shifting at approx. 6800 rpm to avoid hitting the rev limiter, and see if that reduces your e.t., and increases your trap speed. Just remember the DA(ambient temperature, humidity, track altitude), track condition, and your launch prowess have a huge impact on your e.t. and speed.

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post #3 of 5 (permalink) Old 07-02-2013 Thread Starter
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Thanks for the reply - That validates what I have read and heard from other GT drivers. The power really did start go away but my bad I did not watch the RPM when that happened just shifted so I know I lost a lot of time - Friend Video the run and you could hear the car shutting down right as I shifted, Hitting the track again next week with a new set of control arms and hopefully more brain power to pay attention to details.Right now it is hot and humid so will not be great. As for 60ft time like a rookie that I am about 2.2 My goal is running the 12.50 bracket this year and 12.00 next year - of course that will be after intake manifold - headers and some drag radials - New at this sport boy it is getting expensive but a lot of fun - Just a fyi I do have a bam a 93 octane race tune loaded
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post #4 of 5 (permalink) Old 07-02-2013
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You're welcome.

Not hitting the rev limiter should knock some time off your 12.90 e.t.
Add cooler/drier weather and a 2.0 sec. 60' to the mix, and you should easily be in the mid-12's with no additional mods.
Lowering your 60' time will probably require the most practice due to the difficulty of getting consistent launches on street tires. Plus, the Bama 93 race tune can be touchy when trying to keep the revs steady while slipping the clutch during a launch.
But drag racing is a hoot, like you're discovering.

Good luck, and let us know how things progress.
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post #5 of 5 (permalink) Old 07-02-2013 Thread Starter
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Thanks Again - Will post after next track run - In NH at NE Dragway and they just had a big event so the track is really great just damn hot!!!
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