Does the Viper come with a REV Limiter?

[Devin 97 Blue GTS]

Does the Viper come with a REV Limiter?

 

[Marv S]

yes

 

[MES]

Yes fuel cut-off is 6,200

 

[Afy]

And... the first time you hit it while driving will scare the daylights out of you..

 

[GR8_ASP]

Steve are you sure the rev limiter does not work when in neutral? My guess is you are thinking about a missed shift like hitting 2nd instead of 4th or 1st instead of 3rd. I do not believe the PCM knows what gear you are in.

Ron

 

[toddt]

A rev limiter that did not work in neutral would be illogical. (and not likely)

 

[Marv S]

The motor revs pretty quick if in neutral or clutch is pressed in. It does not have the resistance of moving the car like when in gear. I think the huge momentum the motor has when it zings past 6200 rpm in neutral and then fuel cuts off could easily carry it past safe rpm levels.

 

[KenH]

Having hit my rev limiter for the first time while playing with an F40 this weekend, I can attest to the 'Oh Sh*t' factor!

--- Ken
'01 GTS

 

[Backdoc7]

I just hit the rev limiter 20 minutes ago.. I can now say, it takes about 10 minutes for your heart get back to normal..


Bill

 

[CitySnake]

Alright gentlemen...I'll be the one to ask. When the fuel cuts off (engine stall), exactly what happens. Rear wheel lock up?

 

[Joe Dozzo]

My 98 definitely has 6200 rpm limit, neutral or no. However, force the transmission into 2nd from some high speed - to help slow down / setup for next turn / or just miss a gear (BAD) downshifting - and the rev limiter can't stop the mechanical rotation beyond 6200.

 

[GR8_ASP]

Lil Red you are fairly close. I was trying to be kind when I indicated that the pcm does not know the gear and that if overspeed occurs it is because of a missed shift. An overspeed for that reason is very dangerous to the engine. The ability to synchronize in a missed shift is definitely a possibility with the Viper and most other transmissions. Unfortunately I can attest to the fact on the Viper. In that case it is just about like locking the tires as they slow down quite rapidly, given the rotating inertia of the Viper power train. I believe the 2-1 downshift when intending to upshift is the world's fastest way to change direction.

Someone earlier indicated that the engine will race by the fuel shut-off if in neutral. Not so. The forcing function for the engine to accelerate (or continue to increase in engine speed) ceases immediately when fuel flow is disrupted. No combustion, no force, no speed increase. The inertia that exists works heavily against a change in speed, up or down. However, the rapid on-off-on cycle can loosen most kidney stones.

Not much science to the current system. More sophisticated systems can limit engine output, preventing engine overspeed without completely shutting off fuel, and the rapid hot/cool cycles and positive/negative torque aspects, that single phase fuel shut-off systems create.

 

[Paolo Castellano]

Originally posted by KenH:
Having hit my rev limiter for the first time while playing with an F40 this weekend, I can attest to the 'Oh Sh*t' factor!

--- Ken
'01 GTS

Ken, how did you do against the F-40? Inquiring minds want to know! Paolo

 

[KenH]

Paolo,
We were on some back streets, so couldn't do much more than pull through about 1st. It was during one of those 0 to second gear sprints when I hit the rev limiter.

As far as I could tell, he was full on it and I kept up with him, but it's tough to tell just how hard those Ferrari's are being pushed. They always sound like they are at full throttle when doing anything more than idling. Gotta love the sound of those things. This guy owns an F40, F50 and a stable of other ferrari's. Tough life I guess. Now if we could just get that acrylic engine cover look so I didn't have to keep opening my hood to show people the engine.....


--- Ken
'01 GTS