Hi
My f-type r on P or N is going only to 4k rpm. Is it possible to go to higher revs or rev limiter on park or neutral?

 

No...and for good reason!!!!

 

Why on earth would you want to?

 

All 5.0 are limited to 4K revs.

 

Ok thanks.

 

What is the redline for the 5.0 under load?

 

I've tried reving mine in Park to make exhaust sounds (don't have switchable active exhaust, so it doesn't do much), and it doesn't seem to like it - feels like the engine is out of balance or something.

 

3-4k is the most you'd ever want to free-rev a motor that's not under a load...

 

I've building race engines since '86. Never had an issue with "free rev" -- what exactly is the issue? My V8's turn 8300 rpm+/-. The valve train and crank does not "know" that it's free revving... sigh...

And to the OP's question: no, sadly. *Boring*. I wish they would have allowed more "free revs"

 

At specific engine speeds, destructive harmonics can be established on free revving engines, particularly when there are loose bearing tolerances. Under load, those harmonics are either fully mitigated or substantially damped to a point where it is a non-issue. Race engines are blue-printed, balanced, and built to sufficiently close tolerances that the harmonics are not a concern. Also, racing engines have to be rebuilt with sufficient frequency that the bearing tolerances don't loosen too much.

 

Rev limiting is accomplished by "killing" the igniton spark. So when you hit the rev limit the engine is actually "missing" causing it to run rough if you keep it at the rev limit.

 

Yes, I was wondering why as well. In the performance world, newly-built engines are routinely bench, dyno-tested to measure flywheel hp and torque.

 

Yes, but only revved up to redline under load. That's how they measure the horsepower and torque: by applying a known load to the wheels.

 

If you ever get a chance to see it, there's a documentary on the Audi R8 factory (I think it's Megafactories, or something like that).

They stress test their V10 engines before putting them in the car, and run them for hours at the redline until they are literally red hot. That sort of testing is why the Germans are so renowned for reliability.

 

And maybe why my 2004 Audi A8L and my wife's 2006 BMW 325 xi Wagon both have north of 180,000 miles on them - yes, separately - with very few problems along the way! Both still look fabulous and ride great. That's what I call a resounding endorsement for German engineering...and that's coming from a NY Jew. (Just a little - very little - levity).