Revving in neutral?

[Tacoma2TRX]

Ok, so there are a few long, almost tunnel-like overpasses in San Diego and certainly other tunnels in places I like to travel…..I noticed once on my drive back from Georgetown KY and then again last night in one of these long overpasses….that if I throw it in neutral and give it some revs, I may get a half a rev on the first pedal pump, but the second one the engine will not rev. Is there some control in place that prevents revving while rolling in neutral?

*yes I’m that guy who loves to hear his 700hp muscle truck. This may wear off, but for now It makes me smile.

 

[Boosted]

Yes, rev limiter kicking in so you don’t blow your chit up!

 

[Tacoma2TRX]

Yes, rev limiter kicking in so you don’t blow your chit up!

Always gotta be some enginerd ruining my fun. Jk fellow nerds, don’t get all butt hurt.

But seriously, why would revving blow the engine? If you stomp on it from a stop light it definitely red lines….that’s all the revving I’d like to do in neutral and for a very brief second….not peg it like a sport bike.

 

[Eighty]

Revving while rolling in neutral is electronically limited. It’s referenced in the user manual - do a search for “anti-douche limiter”

 

[Eighty]

There is a way to overcome the limiter, though. It requires tow mirrors to be flipped up, and the vehicle must be moving at least 50 mph with the parking sensors detecting another vehicle within 10’ of the front bumper.

 

[Louk]

Always gotta be some enginerd ruining my fun. Jk fellow nerds, don’t get all butt hurt.

But seriously, why would revving blow the engine? If you stomp on it from a stop light it definitely red lines….that’s all the revving I’d like to do in neutral and for a very brief second….not peg it like a sport bike.

I was under the impression that free revving the engine is bad but an engine when under load is ok. Not sure if there is any truth to it, but I have heard it more than once.

 

[That Guy]

I was under the impression that free revving the engine is bad but an engine when under load is ok. Not sure if there is any truth to it, but I have heard it more than once.

It's not gonna hurt anything but it always reminds me of someone who's never been around performance vehicles

 

[Fifty]

It’s literally an epa thing….

Because people reving their motor is a waste of gas according to a pencil pushing piece of shit.

 

[TReX-RAM]

Previous thread:

Rev limiter in Park or Neutral

When you're in P or N, I think it limits you to 4,000 or 4,500 RPM while revving. Does anybody know how to override this and give it all the beans?

www.ram-trx.com

 

[El Jefe]

There is a way to overcome the limiter, though. It requires tow mirrors to be flipped up, and the vehicle must be moving at least 50 mph with the parking sensors detecting another vehicle within 10’ of the front bumper.

. . .and your blinker fluid at 50% capacity or greater.

 

[JumpSquadAuto]

Sometimes when I am in the Boston tunnel, I prefer to downshift to about 5k rpms and build up enough room in front of me to just floor it. Don't have to worry about rev limiters and sounds epic.

 

[PapaPaka]

Ok, so there are a few long, almost tunnel-like overpasses in San Diego and certainly other tunnels in places I like to travel…..I noticed once on my drive back from Georgetown KY and then again last night in one of these long overpasses….that if I throw it in neutral and give it some revs, I may get a half a rev on the first pedal pump, but the second one the engine will not rev. Is there some control in place that prevents revving while rolling in neutral?

*yes I’m that guy who loves to hear his 700hp muscle truck. This may wear off, but for now It makes me smile.

It's times like this I kind of wish the truck was a 6-speed manual. I used to push my clutch in on my Scatty and do this under bridges all the time. Like, all...the...time. To a point where my wife would comment when I didn't do it. LOL

So with that being said, maybe the rev limiter is more to protect the tranny vs the motor? Unless it's a Hellcat thing. I have never owned a Hellcat before, let alone one with a manual tranny.

The C8 lets you pull both paddles in and rev it while rolling. Just saying, that's kind of freaking cool. Little jeally we can't do the same in the Rex.

 

[Yreka_Kid]

Sometimes when I am in the Boston tunnel, I prefer to downshift to about 5k rpms and build up enough room in front of me to just floor it. Don't have to worry about rev limiters and sounds epic.

this is the way!
My tunnel:

 

[AZDinoPwr]

Free revving can hurt engines in multiple ways depending on the engine design. Not sure if the hellcat motor is susceptible to any specific mode of failure.

Specifically free revving can float a valve or rev past the intended redline and damage valve train components depending on how the spark is controlled. This is due to change in angular momentum at a much higher than intended rate and sensor refresh rate not high enough to control spark and fuel to keep from over revving.

More likely and common is that free revving has much lower cylinder pressures which prevents the rings from seating properly so you end up burning oil and building up more carbon.

 

[EMS1231]

Free revving can hurt engines in multiple ways depending on the engine design. Not sure if the hellcat motor is susceptible to any specific mode of failure.

Specifically free revving can float a valve or rev past the intended redline and damage valve train components depending on how the spark is controlled. This is due to change in angular momentum at a much higher than intended rate and sensor refresh rate not high enough to control spark and fuel to keep from over revving.

More likely and common is that free revving has much lower cylinder pressures which prevents the rings from seating properly so you end up burning oil and building up more carbon.

Holy shit! That is so informative. That’s what all of these TRX owners were hoping to hear!

 

[That Guy]

Free revving can hurt engines in multiple ways depending on the engine design. Not sure if the hellcat motor is susceptible to any specific mode of failure.

Specifically free revving can float a valve or rev past the intended redline and damage valve train components depending on how the spark is controlled. This is due to change in angular momentum at a much higher than intended rate and sensor refresh rate not high enough to control spark and fuel to keep from over revving.

More likely and common is that free revving has much lower cylinder pressures which prevents the rings from seating properly so you end up burning oil and building up more carbon.

Lets agree it's not a smart thing to do

 

[AZDinoPwr]

Lets agree it's not a smart thing to do

Neither smart nor appealing.

 

[PapaPaka]

I never claimed to be smart......or appealing.

 

[Jesse56]

they did it so no one would squat these trucks and bounce the rev limiter while jumping in the bed of the truck and swinging there arms. we should be thanking the engineers

 

[ChazJ]

It's not gonna hurt anything but it always reminds me of someone who's never been around performance vehicles

Wait so revving a performance motor reminds you of someone never having been around them??? I cant wait! I got tell all the guys at the shop they're wrong!