GT Redline

[Norm Peterson]

So, what's the point with everyone wanting to hit close to 7000 when you shift?? I don't get it.

If you're autocrossing, running up a few more rpms can save you from making a time-wasting upshift (followed by an even more time-costly downshift).

It's similar on a road course where you'd really prefer to not need an upshift gear only for the last couple hundred feet before your brake marker.

For the drag racer, it's also going to be about not being forced into an extra upshift just before the finish line.

On the street, 7000 is pointless once you've found out what happens when the revs get up there.


Norm

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[Todd15Fastback]

 

[fionic]

absolutely nothing wrong with redlining the engine. it's within the specified parameters. it's not like people are just cruising around at redline...

 

[Grimace427]

That is actually part of my regular maintenance plan for my 2011 Coyote.

 

[Grintch]

My fuel cuts off at around 6800... Not once has it gotten anywhere near 7k. I think maybe those stats are backwards. 6750 fuel cutoff with a 7k redline for an overrev indication.

Jimmy, the 6500 is more of a soft "redline" meaning the engine isn't making much more usable power beyond that. More or less a recommendation to shift. It is the ideal shift point for a Stock coyote.

Well I haven't seen any dyno curves, but Ford claims the engine makes max power at 6500, so it is very difficult to believe that the engine stops making power at 6501. In general, for most cars the optimum shift point occurs 500 to 1000 rpm after peak power. And more the latter unless the engine is peaky, which ours is not.

This has bothered me from day 1. As has the 160mph speedo in a car that will do 165 stock. (and the useless vacume gauge)

 

[DivineStrike]

Redline refers to the maximum engine speed at which an internal combustion engine or traction motor and its components are designed to operate without causing damage to the components themselves or other parts of the engine.[1] The redline of an engine depends on various factors such as stroke, mass of the components, displacement, composition of components, and balance of components.

The excerpt from wiki for those of you that didn't want to look into it further btw.

Also from Dictionary.com
noun 7. Automotive.

1. the maximum rotational speed, or angular velocity, of the engine crankshaft that is considered safe: often measured in rpm.
2. a red line or boundary of a red area that delineates such a value, as on a tachometer.

Oxford:

noun

The maximum number of revolutions per minute for a car engine.

here's an old web article about it....

http://www.cartalk.com/content/how-do-engine-manufacturers-determine-redline-engine


So, yes there is a redline on your tach, however it doesn't necessarily mean it is the redline of the engine. We have talked about a safety margin, that is what the limiter is for, so you don't exceed the engine parameters. It seems the redline on our tach is really just telling us "hey you are revving really high right now...shift!"

The coyote is a well built engine and it's engine redline is pretty high, so there isn't much to worry about unless you do a mechanical overrev of the limiter, then I'm not sure how tuning and such effect an occurrence like that.

Grintch, power falls off pretty quick after peak power in the GT. Here is my dyno for reference

 

[Katastrophe]

Here you go guys. I can't see anyone running a 5.0 this high on a daily...

[ame]

Also, an FYI for some who appear to be confused. The rev-limiter has no bearing on what an engine can physically rev to. It is only there as a safety net. Most manufacturers set them just after peak power is made...there isn't a whole lot of purpose to running a gear past peak power, unless you are too close to the next braking zone/finish line to upshift.

 

[JimmyTwoTimes]

Well I haven't seen any dyno curves, but Ford claims the engine makes max power at 6500, so it is very difficult to believe that the engine stops making power at 6501. In general, for most cars the optimum shift point occurs 500 to 1000 rpm after peak power. And more the latter unless the engine is peaky, which ours is not.

This has bothered me from day 1. As has the 160mph speedo in a car that will do 165 stock. (and the useless vacume gauge)

Vacuum gauge is helpful in hyper-miling.

 

[Todd15Fastback]

absolutely nothing wrong with redlining the engine. it's within the specified parameters. it's not like people are just cruising around at redline...

Yep. You are preaching to the choir. I redline my daily and multiple times depending on how much driving I am doing and where.

Have done the same with all my other V8 powered Mustangs (9+) and not one engine issue ever. This includes custom tunes, etc.

 

[Todd15Fastback]

There are no parameters at 7000! That's it...fuel cut off. Maxed out. Do what you like...those of us who know what has been designed by Ford for this engine are helping those that don't know much. Other's that want to max out RPM to the fuel cut off point...have at it. Your car. Wear it out as you please.

Never said that revving that high is not possible, nor will it hurt the engine...ONLY if it's done repeatedly over time...you are not doing it any favors....and again...it's a waste IF you are wanting the quickest response out of your engine...for street driving.

I'm done playing in your red line sandbox. it's been well explained here. You all have fun fumbling with your red lines!

You know what was designed? Are you some Ford engineer?

 

[Grimace427]

So, WHEN does the engine stop makin hp???

When it hits the rev limiter, which can be set to wherever the tuner wants to set it.

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