Just read an article on Corvette Blogger that quotes a GM engineer type that says ecm will not let engine reach full potential until it has 500 miles on it to protect it until break in.

 

https://www.corvetteforum.com/forums...-opinions.html

 

This has been suggested but does not seem to be true based on the performance past this mark. In fact the Vette in the Vette vs Viper had 700 miles.
I think whoever made this statement is full of ****.

 

Were you at the race? or are you speculating based on that thread? I thought SO. You probably think you can keep your insurance and your doctor. Have you ridden in the car? have you even seen one? Enough said, JD Great car no matter what you think!!! a ball to drive.

 

Was this response really necessary?

 

I don't really see anything wrong with his response. That was ONE race vs what GM recommends.

The insurance poke was more at Obama and I am fine with that.

 

I would say that this is true only if it is documented as such in the owners manual. Can anybody verify anything about the Z06 ECM in the manual ?

 

From what guys have shown us via scanned pics of their Owner's Manual... GM says rpms should be kept below 4000rpm until 500miles. There are some other recommendations in the OM mentioned.

Unless a current owner can verify that GM's new info is in the OM, I'd say "no", it isn't in there.

I find it interesting that GM's statement was released _after_ cars were on the road. I also find it interesting that these cars on dyno's across the country are seeing 575-580+rwhp with literally 50 miles on them (which I, for one, believe is right in line with the 650hp flywheel rating).

There's not a hot-rodder on this board that wouldn't agree that the drivetrain loosens up some and gets more efficient with some miles. This is related _just as much_ to the trans/diff breaking in as it is with the engine (if not moreso... today's engines seat rings instantly, part of technological advancements certainly over the last 30-40 yrs). So, sure it is going to make a little more power as a by-product once the car has some miles on it. A full-fledged "power limit" self-imposed by the factory PCM? Will a stock car with 600+ miles on it make 600+rwhp stock on the same dyno that it made 580rwhp on when it had 50 miles on it?

Maybe at some point we'll have some quantifiable, real-world, data.

 

Dyno figures we've been seeing from the tuners don't appear to reflect 'break-in restrictions' within the ECU.

 

YES it was!! I am getting pretty tired of people making assumptions based on threads and posts of people that have never seen the car, let alone driven or ridden in one! Not to mention the fact that they, the ones making the assumptions have not seen, driven or rode in the car either. It amazes me that some people can make a buying decision on the opinion of a person or persons on the internet that they have never met. However I continue to be amazed every day at my age, it really is a new world. JD

 

http://www.chevrolet.com/content/dam...14corvette.pdf

See. 9-17. Best that I could find.

 

Thanks Jack... these were exactly the pages I have seen and was referring to in my post above.

I'm going to take dyno charts posted (and others I've seen that are not posted here) as objective, quantifiable data. If owners/potential owners/whoever don't want to use those as accurate to determine power-production of a particular vehicle... then that is your prerogative. I'm sure you realize you would be in the _vast_ minority.

Taking GM at their word, a C7Z (or any other car where they might have programmed a power-limitation from the factory for XXX miles), will dyno noticeably higher AFTER 500+ miles than it would with <500 miles.

 

The race thread showed the z06 getting destroyed 7 times by the Viper....That is conclusive...

GM oversold the car and it isnt meeting the high expectations that they created.....

They hyped the car as being track worthy, but failed to mention that's only for the first 5 minutes.....

They also didnt engineer the car to maintain peak power output for more than a few seconds.....Another fail considering the type of car this is supposed to be....

GM brought this on themselves.....If the sales hurt enough because of this , I can see GM doing some hasty engineering fixes , although it will probably be a year or two before they reach production....

Leaving the first year buyers out in the cold.....


It is , what it is.....

 

Rude and unnecessary!

 

Grow a thicker skin.

 

I didn't say anything rude or unnecessary. I asked a simple question, and I will ask the same of you and others making totally unfounded posts. Have you or they driven, ridden, or even seen the car? I just think that it is funny that so many people with no real basis exept other posts are posting like this info is fact. First, one or two street drag races do not make the car bad or any less than GM has represented. Also there is a lot more to a car than straight line or track performance. No one seems to be interested in the fact!! yes FACT that it is a real fun car to drive. And quite frankly is an engineering master piece. I extend the same invitation to you and anyone else that would like to get in touch with me, to take them out and spend some time in the car. I have had 3 or 4 people take me up on it, and all have gone away very impressed. JD OK, I'm going to give you the last word.

 

And now you are trying to justifying your rudeness.

 

There was absolutely nothing rude about your post. I couldn't have said it better myself...

 

 

The original post that brought so much ire just called into question GM saying the ECM is programmed to unlock more power past 500 miles.

I didn't read where it said anything about the car not being fun to drive, or how cool it is, or how great it is.

The _facts_ also state the car has been tested at 575-580+rwhp in _stock_ form with less than 100 miles on the odometer (numerous times). This is documented fact...nothing subjective about someone liking/loving the car or hating the car. In fact these are owners/shop owners who bought the car ... so they love the car.

Given these _facts_, I fully expect stock cars to be making north of 600rwhp once over 500 miles (based on GM's claim). I don't know whether we'll see that or not... b/c, to date, I'm not sure anyone has dyno'd a car before 500 miles and post-500 miles in _stock_ form. The tuners who have dyno'd them stock are modding them immediately.

So ... we wait and see for more objective facts to arise.