[NASTY99Z28]

Originally Posted by hotlapZL1

It does drop below 6250, resets the clock and then rev's right back into the "over rev" zone of 6250 to 8250 rpm. This feature is an acknowledgement that going beyond 6250 rpm is not a desirable thing and the duration there needs to be limited. If you bounce in and out of the "over rev" zone splitting your time there, will the engine last.?. Do you know how the warranty is worded?

It needs to drop below 5000rpm in order to reset if not it'll limit it to 6250. Or 15secs below 6000rpm. I think it's a way for Ford to sidestep warranty problems.

[ChefBorOzzy]

Originally Posted by ztwentypoop

That's funny, in the two Continental races it's been a part of, to-date, I don't recall there being any mechanical issues with the engine. How can it perform so well in an actual track environment and be expected to perform worse in the hands of private owners?

I get a lot of the GM fanboys don't want the GT350 to be successful, let alone beat the z/28 around a track, but it seems there is a lot of speculation on what the cars can and cannot do versus any real evidence. Here's a novel idea, why don't we wait until the cars are in owners and magazines hands and see what the real world shows us about the car!

Wait for what? What is written by Ford is definitely questioning the motor. It's unfair to question how this will work when they are limiting RPM use? Go tell them to wait on all their Camaro weight speculation, how expensive it will be, how shitty it will be, etc.

[rayhawk]

8 seconds seems strange to me. If this were a long term durability issue, why not allow 20 or 30 seconds above 6250 rpm? That would be more than long enough to avoid running into this limitation and would prevent someone from driving for extended times at 8000 rpm and causing excessive wear. I realize it is cumulative wear that they are concerned with, but 8 seconds seems awfully restrictive.

I also find it interesting that they call it an overrev condition, trying to make it sound like they are giving you something extra by allowing you to go above 6250 for a short while. If this is really the way they are looking at it, the motor should be rated at max. normal operating rpm, with the additional power listed as a bonus for a short time.

[ChefBorOzzy]

It's probably 8 seconds consecutively in the zone. If you shift, won't it drop below 6,250 for even a brief period?

[hotlap]

Originally Posted by NASTY99Z28

It needs to drop below 5000rpm in order to reset if not it'll limit it to 6250. Or 15secs below 6000rpm. I think it's a way for Ford to sidestep warranty problems.

It only needs to drop below 5000 rpm if the 8 seconds in the "over rev" rpm zone is exceeded. I took the shift rpms provided by khell86 to be the rpm you drop to if shifting to the next gear at 8250. So if you shift frequently to not dwell in the "over rev" zone of 6250 - 8250 rpm, the computer won't shut you down.

I agree that Ford is sidestepping the warranty because it appears to be unusable as a track car as delivered

[NASTY99Z28]

Originally Posted by hotlapZL1

It only needs to drop below 5000 rpm if the 8 seconds in the "over rev" rpm zone is exceeded. I took the shift rpms provided by khell86 to be the rpm you drop to if shifting to the next gear at 8250. So if you shift frequently to not dwell in the "over rev" zone of 6250 - 8250 rpm, the computer won't shut you down.

I agree that Ford is sidestepping the warranty because it appears to be unusable as a track car as delivered

Ah ok that makes sense. Now the problem is it's been stated that because of the broad power band you spend alot of time in 3rd or 4th would leave me to believe you could spend a good chunk of time in one gear over 6250 in tighter parts of a track. So you have to be cautious on how you drive the car or it'll basically go into a glorified limp home mode. And to think people bash the zl1 or z06 for heat soak yet defedn this!!! That's the sign of a true fanboy.

I think the motor itself will have no problem and guys will tune this out but that'll cost you a warranty. That imo is the biggest reason for this feature. Any car maker that's builds a hipo track car knows how they will be driven and has to do something to cover themselves.

[NASTY99Z28]

And it means that these cars won't be a contender at any roll race events if you choice to do so since it'll pull rpm's way before you finish.

[ULTRAZLS1]

3 radiators = band aid

limiting rpms after 8 seconds= I love it?

It doesn't get any more hypocritical than that.

This is the exact definition of a band aid. Doubt it will be a huge issue. But it is what it is.
Ford does not have confidence in the durability of this motor... Simple as that. Put a band aid on it.

[hotlap]

Originally Posted by NASTY99Z28

I think the motor itself will have no problem and guys will tune this out but that'll cost you a warranty. That imo is the biggest reason for this feature. Any car maker that's builds a hipo track car knows how they will be driven and has to do something to cover themselves.

IMO that is why the ZL1 had such a conservative tune (8 psi boost, no CAI, etc). It is easy to get 650 HP out of a LSA but GM went with a mild configuration but stands behind it at the track. That is also why the LS7 and LS9 were hand built and used titanium rods.

Given that flat plane crank engines are vibration prone, this "over rev" feature is scary.

[hotlap]

Originally Posted by ztwentypoop

That's funny, in the two Continental races it's been a part of, to-date, I don't recall there being any mechanical issues with the engine. How can it perform so well in an actual track environment and be expected to perform worse in the hands of private owners?

I get a lot of the GM fanboys don't want the GT350 to be successful, let alone beat the z/28 around a track, but it seems there is a lot of speculation on what the cars can and cannot do versus any real evidence. Here's a novel idea, why don't we wait until the cars are in owners and magazines hands and see what the real world shows us about the car!

Such passion for the GT350 but barely a peep about the 2015 Z/28 "you" owned

[thefappingbearcutler]

Overrev has been debunked on the "other" site. Must have been a thought at some point though.

Are there other NA engines that use this type of thing? I thought FI would use this type of setup to prevent grenading in unfavorable conditions? Why would NA need this?

[Bhobbs]

Originally Posted by thefappingbearcutler

Overrev has been debunked on the "other" site. Must have been a thought at some point though.

Are there other NA engines that use this type of thing? I thought FI would use this type of setup to prevent grenading in unfavorable conditions? Why would NA need this?

Who was the guy that made the posts? How do we know he knows anything?


I read that early 5.2 Voodoos were vibrating themselves to pieces at higher RPM. This may have been considered to protect the engine until they worked out the vibration issue.

[thefappingbearcutler]

Originally Posted by Bhobbs

Who was the guy that made the posts? How do we know he knows anything?

He is an insider of sorts, just like some folks are on here for this site. I mean, he could be wrong but he has been correct in the past about information. Knowing Ford, they probably outsourced that technical writing to an outside company and did very little proof reading. If you read the doc, you will notice that there are many things that are incorrect.

Being a lurker of both sites, you tend to pick up on who the ones are in the know and who doesn't. Unfortunately, due to being a family man and living in the most corrupt tax happy county in the US, I will be relagated to the Olds beater until my children (or wife lol) are out of the house. Maybe one day I can have my American made sports car!

[SuperSound]

Originally Posted by thefappingbearcutler

He is an insider of sorts, just like some folks are on here for this site. I mean, he could be wrong but he has been correct in the past about information. Knowing Ford, they probably outsourced that technical writing to an outside company and did very little proof reading. If you read the doc, you will notice that there are many things that are incorrect.

Being a lurker of both sites, you tend to pick up on who the ones are in the know and who doesn't. Unfortunately, due to being a family man and living in the most corrupt tax happy county in the US, I will be relagated to the Olds beater until my children (or wife lol) are out of the house. Maybe one day I can have my American made sports car!

Exactly what is incorrect? I'm not seeing improper grammar or misspelled words. Unless the information is flat out wrong, not seeing how this is bad translation or proof reading. It would be easier to say the information is not official from Ford.

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