For release: Jan. 14, 2008, 12:01 a.m. EST...........................................

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Jan 9, 2008 | 11:25 AM

#31

Z28x

Registered User

Joined: Jan 2000

Posts: 10,285

From: Albany, NY

http://www.thecarconnection.com/scra...rapbookID=1556

Jan 9, 2008 | 12:00 PM

#32

Eric Bryant

Registered User

Joined: Aug 2001

Posts: 2,400

From: Michigan's left coast

Quote:

Originally Posted by SSbaby

Hypereutectic pistons are what the LS7 has... and we all know that its probably a wise choice not to go the power adder route with those pistons.

The problem with supercharging the LS7 isn't the piston material, but rather the combustion ratio. It's terribly unwise to throw any boost on top of an 11:1 compression ratio.

Hypereutectic pistons are plenty strong - they're just not tough enough to handle detonation at high power levels. Modern engine management systems with proper calibration do a great job of preventing detonation, so this isn't a problem if the engine is properly modified and tuned.

Quote:

I wonder how much more the engine is capable of handling, STOCK?

A hell of a lot more, as long as the tuner can figure out how to keep the engine from detonating. Too many folks want to advance the timing until is sounds like someone is beating on a trash can with a hammer, and then pull a couple of degress out.

Jan 9, 2008 | 01:38 PM

#33

Derek M

Registered User

Joined: Dec 1999

Posts: 538

Quote:

Originally Posted by Zigroid

using a gear ratio calculator and a 6500 rpm red line:
1st is good for 35
2nd 59 (boo, 2 gear changes for 0-60)

You could always swap in a power glide!

Jan 9, 2008 | 02:16 PM

#34

Zigroid

Registered User

Joined: Feb 2004

Posts: 948

From: Stroudsburg, PA

Quote:

Originally Posted by Derek M

You could always swap in a power glide!

my 1968 bonneville does 60 mph in 1st gear and only revs to 4500 rpm

Jan 9, 2008 | 06:42 PM

#35

DAKMOR

Registered User

Joined: Dec 2006

Posts: 1,406

From: Philaduhphia

Can I get the ratios for the manual in the auto?

Jan 9, 2008 | 08:02 PM

#36

HAZ-Matt

Registered User

Joined: Mar 2001

Posts: 4,000

From: TX Med Ctr

Quote:

Originally Posted by JakeRobb

Where in the heck are you getting those speeds?

According to my calculations (which are approximate because I had to guess at the tire size and redline), first gear will be good to about 30mph in the automatic version and about 50mph with the manual trans.

Regarding it being useless at WOT... did you not read about Performance Traction Management?

I didn't calculate anything, I exaggerated with what I thought would be an easily identifiable fake number. And I did see the thing about their Performance Traction, but why get more TCS to compensate for overly short gears. Also I did not discuss the rear-end ratio for the manual at all, even though it is the same. Since the manual gear ratios are completely different than those in the auto 3.73s are a more "normal" ratio for that transmission. I still wouldn't be surprised if the auto ended up with 2.73s.

Last edited by HAZ-Matt; Jan 9, 2008 at 08:05 PM.

Jan 9, 2008 | 08:21 PM

#37

96_Camaro_B4C

Registered User

Joined: Aug 2002

Posts: 3,650

From: Indianapolis, IN

Quote:

Originally Posted by HAZ-Matt

I still wouldn't be surprised if the auto ended up with 2.73s.

Same here. Could easily be a typo. Press releases, which are not written by engineers, rather frequently have these types of problems (along with web sites).