GT Redline

[DivineStrike]

So how does one know what this critical point you should not pass is if not for the markings on the tach? The actual line that is red (and most often used to indicate redline in cars) starts at 6500.

I am thoroughly confused at the way this tach is marked up.

Sorry I meant to add more to that statement originally, I edited after your post apparently. With modern cars, most of the time you hit the fuel cutoff/revlimiter long before the redline of the engine. It's a safety measure from manufacturers. Sure some of the tachometers on vehicles might have a "redline" on the tach, but nowadays a manufacturer just isn't going to let you get to the real redline of an engine.

As with the GT having some light hash marks before a darker set, it is probably there for shifting or a "hey don't stay here too long" kind of thing.

Khaboom, there's a test floating around here somewhere, where they installed the Boss 302 intake and only made power to about 7400 or so. It lost quite a bit of midrange. Tester also said they did minimal tuning. So your guess is as good as anyone elses really.

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[Grimace427]

A boss 302 makes peak horse power around 8k on the coyote engine. Ours is limited too 6500 for redline but let's us push too 7k but after 6500 HP goes down. Wonder if using a boss intake manifold and setting to 8k would be OK for these engines since its built a bit better than a regular boss 302 engine?

You are a little confused here. The Boss 302 had forged rods as pistons as well as upgraded valvesprings but the 2015 Coyote does not share the Boss 302's forged pistons.

The Boss 302 definitely does not peak at 8,000rpm either, more like 7,500.

 

[foghat]

Sorry I meant to add more to that statement originally, I edited after your post apparently. With modern cars, most of the time you hit the fuel cutoff/revlimiter long before the redline of the engine. It's a safety measure from manufacturers. Sure some of the tachometers on vehicles might have a "redline" on the tach, but nowadays a manufacturer just isn't going to let you get to the real redline of an engine.

As with the GT having some light hash marks before a darker set, it is probably there for shifting or a "hey don't stay here too long" kind of thing.

Khaboom, there's a test floating around here somewhere, where they installed the Boss 302 intake and only made power to about 7400 or so. It lost quite a bit of midrange. Tester also said they did minimal tuning. So your guess is as good as anyone elses really.

I would have thought the term redline was coined due to the redline placed on the tach...

Regardless, you are using the word redline in a different context (right or wrong) than the majority of us are.

There are 3 different markings on this tach indicating that 6500rpm is something. Then you have the 'light' hashed marks running from 6500 to 7000 - at which point bolded hash marks occur. This suggests to me that you should be able to take things to 7000rpm. But you can't, so why mark things up like that? I dunno.

 

[KArob486]

So when I was merging onto an empty freeway the other night, I thought I'd let the ponies out to play a bit. I can definitely confirm that my GT auto will light up the tach in a very bright red at or close to 6500, but it went a little past that before shifting. 6500 seems to be the "warning" point

 

[thehunterooo]

In sport and WOT my car will shift at about 7000.

 

[Catfish]

You are a little confused here. The Boss 302 had forged rods as pistons as well as upgraded valvesprings but the 2015 Coyote does not share the Boss 302's forged pistons.

The Boss had sinter forged rods, which i believe is near identical to the 2015 coyote rods. The boss did have forged pistons while the new 2015 coyote has a new stronger cast piston over previous years. The boss did have nice CnC'ed heads however the new coyote heads spec nearly the same I believe. My Shelby has the sinter forged crap rods also. Always the weakest link with the Ford mod motors.

2015 coyote engine:
http://www.stangtv.com/news/inside-the-2015-mustangs-5-0l-coyote-and-2-3l-ecoboost-engines/

2012 Boss Roadrunner:
http://mustangsdaily.com/blog/2011/02/15/a-look-inside-the-2012-mustang-boss-302s-444-horsepower-v8/

I'm curious to see how the "charge motion control plates" pan out. Its a cool technology that Ford failed on in the past. I am curious if the aftermarket tuning guys have tuned these out in their tunes or if they are leaving them alone. And if a person wants to run the boss intake, can these just be left off of the engine and tuned around.

 

[mustangfamily03]

I would have thought the term redline was coined due to the redline placed on the tach...

Regardless, you are using the word redline in a different context (right or wrong) than the majority of us are.
.

Bingo!

 

[mustangfamily03]

I'm curious to see how the "charge motion control plates" pan out. Its a cool technology that Ford failed on in the past. I am curious if the aftermarket tuning guys have tuned these out in their tunes or if they are leaving them alone. And if a person wants to run the boss intake, can these just be left off of the engine and tuned around.

Check the Americanmuscle.com website. They used a Boss intake on a 15' to spray giggle juice. They said N/A the 15' intake is better than the Boss. But they had issues with the stock 15' intake when spraying. I don't remember if they mentioned the CMPs

 

[Catfish]

Check the Americanmuscle.com website. They used a Boss intake on a 15' to spray giggle juice. They said N/A the 15' intake is better than the Boss. But they had issues with the stock 15' intake when spraying. I don't remember if they mentioned the CMPs

Thanks for the tip, will do.

 

[DivineStrike]

Check the Americanmuscle.com website. They used a Boss intake on a 15' to spray giggle juice. They said N/A the 15' intake is better than the Boss. But they had issues with the stock 15' intake when spraying. I don't remember if they mentioned the CMPs

Slight correction, they said they didn't think it would be worth it. At least with most drivers. A boss still makes power over stock and is better for drag or track.

 

[adrift]

Duh! - The redline is where the "red line" begins!! Hence the name! :headbonk::lol:

Can't imagine why you'd put the redline after the fuel cutoff - you'd never reach it so what'd be :kickrock:the point!? LOL

 

[DivineStrike]

Because you're not supposed to reach the redline of an engine. Otherwise it's just a pretty hash mark on a tachometer

 

[adrift]

Because you're not supposed to reach the redline of an engine. Otherwise it's just a pretty hash mark on a tachometer

OK, let's just refer to the "knowledge authority", Wikipedia, and I'll quote:

"This device is known as a rev limiter and is usually set to an RPM value at redline or a few hundred RPM above."
https://en.wikipedia.org/wiki/Redline#Rev_limiter_and_implementation

What is said about putting the rev limiter first doesn't make sense because then you'd never hit the redline and so there would be no point in even marking the redline. But you do also want to avoid hitting the rev limiter (might cause you to lose a bet or worse) and so putting the red line first is important.

BTW, the point "you're not supposed to reach the redline" also isn't true, the redline is in some cases just a warning that if you operate in that rpm range you may damage the engine.

 

[foghat]

OK, let's just refer to the "knowledge authority", Wikipedia, and I'll quote:

"This device is known as a rev limiter and is usually set to an RPM value at redline or a few hundred RPM above."
https://en.wikipedia.org/wiki/Redline#Rev_limiter_and_implementation

What is said about putting the rev limiter first doesn't make sense because then you'd never hit the redline and so there would be no point in even marking the redline. But you do also want to avoid hitting the rev limiter (might cause you to lose a bet or worse) and so putting the red line first is important.

BTW, the point "you're not supposed to reach the redline" also isn't true, the redline is in some cases just a warning that if you operate in that rpm range you may damage the engine.

Please see post #46.

Divenstrike has a different definition of redline than most. Would be interested in seeing a source or two for his definition of the real 'redline' of an engine.

 

[fionic]

Because you're not supposed to reach the redline of an engine.

... not true.

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