But not ones with a T56 they only had 3.42's. Only Autos had 3.23's and 2.73's.

The flywheel numbers are posted above.

-Dustin-

 

You had to know this is what it was going to turn into.

 

ya i meant 3.42's, the iroc has th 3.23's my bad, the dyno tends to dyno 10-15 lower then other dyno's in the area though

 

Then a web search would have been better than a post...

A quick google found 285 HP listed everywhere, and one place listing torque:

http://autos.msn.com/research/vip/Sp...IP&tab=2&sub=0

 

I was under the impression that regular M6 cars came with the 3.23's and the performance axle in the M6 was the 3.42's. The A4 came with 2.73 standard, but bumped it up to the 3.23's with the performance axle. And yeah, 97 Z28 came with 285hp and 325tq

 

Just take a stock 97 z28 to a dyno and get it dyno'ed.

 

The only years you could get 3.23s in a stock M6 LT1 was in 1993.

In 1993, the M28 6-speed tranny came with 2.73s, the M29 6-speed tranny came with 3.23s. In 94+ the T56 came with 3.42s.

 

I believe that everyone is a bit wrong here. It will remain a moot issue, since the only numbers you have to go on are the "factory claimed" numbers. And even those numbers don't explain exactly why there are differences, e.g., why the SS would have 310-315 vs. 285 for the Z.

And you would think, perhaps, that the factory would be concerned about giving misinformation, but when you look at the numbers they claimed for the first LS1s (Zs at 305 and Vettes at 345) you begin to understand that they are not being held accountable for "lying".

 

You need to do a little research. The 97, SS is rated at 305 by the factory not 310-315. The question was on rated hp not actual. The reason the SS is rate higher is because of the CAI and catback exhaust at the minimum.
The same goes for the Corvette, it has better components which raise the hp.
Also Chevrolet has never lied about the hp except to LOW BALL them.
You sure your not a Ford guy???

 

Well, I purchased my 97SS (full dress) in April of 97 and the HP claimed at that time for my car was 310. In some mags they claimed it was 315 and they were supposedly quoting the factory.

As far as GM: How do you account for the LS1 Z dynos running as high as 300+ which if you back into crank power compute to around 353 HP for the M-6, while many of the vettes were dyoed at less than 300 RWHP?

Low Ball/High Ball, what's the difference: If you are claiming that the Vete is making 50 HP more than the Z, when the dyno says differently, I call that "misinformation".

As far as doing research, it would do you good to remember what this site is about: these are the people who actually have these cars, e.g., moi.

 

I wasnt aware of the 93 years having gear options, but it seems logical since it has that beefy lower gearing in the M28. You learn something new...

-Dustin-

 

And...not to beat this thing: my point is you can't rely on the factory for the whole truth. Just my opinion. For instance, in 1996 the factory supposedly made a few SS models with extrude honed manifolds, which would account for the so-called performance exhaust systems which boosted the hp for the SS up to 310. Alas, they (the factory) apparently told SLP to get rid of the performance manifold for the remainder of 96 and 97 SS.

But as far as I could find out, the factory never told anyone about discontinuing the option. And when the LS1s were coming out, the factory claimed around 305-310 (somesthing like that). I believe that many would have opted for the LS1 had they realized that the HP numbers would compute to around 340+. Again...lies,lies,lies. Not that there's anything wrong with that.

 

Ok, lets try this one more time. The factory, that's GM/Chevy, rates all of there car/engine combo's at NET hp. This is an official hp rating. If they rate them high, say 310 and they only get 300 on the dyno, they(the manufacturer) can be sued or forced to recall the cars and fix them. This happened to Ford over the Mustange Cobra. So, in almost all cases the factory will low ball the hp rating, to protect themselves. Magazine normally post the actual hp reading from their dyno tests.
The standard factory hp rating for the 97 SS was/is 305 hp. The LT4's were 335 hp. The problem with this is that the SS could be special ordered from SLP with lots of different high performance option. Many of which increased the hp of the specific car. However this has nothing to do with the official factory hp rating.
When you think about it, this is to your benefit. Because your actually getting more than advertized, and your insurance is cheaper.
When I said research, I ment other sources. There are many good and informative books and magazines, as well as other WEB resources.

 

All true, but in this case the factory is being "force" to lie or get sued. There were a couple of odd things that went on between the factory and SLP.
I think we're on the same page, just never heard anyone complain about getting more hp.

 

What magazines do dyno tests? I've been a subscriber to C&D and R&T for over 20 years and never seen one. Magazines list the specs the manufacturer gives them.