Go Back   Tahoe Forum - Chevy Tahoe Forum > 2007 + Chevrolet Tahoe / GMC Yukon / Cadillac Escalade Year Models > General Tahoe/Yukon/Escalade Discussion Forum

Register to remove these ads.
General Tahoe/Yukon/Escalade Discussion Forum General Discussion Forum



Reply
 
Thread Tools Display Modes
Old 10-12-2008, 12:33 AM   #1
quikag
Full Access Member
 
Join Date: Oct 2008
Location: Dallas, TX
Posts: 74
quikag is on a distinguished road
Default What is the 23hp difference between the Denali/Escalade?

I haven't been able to identify the differences in the two 6.2L motors to provide 403hp in the Escalade and 380hp in the '07/'08 Denali. Anyone know definitively?
quikag is offline   Reply With Quote
Old 10-12-2008, 02:32 AM   #2
Black Dog
Full Access Member
 
Black Dog's Avatar
 
Join Date: Feb 2008
Posts: 827
Black Dog is on a distinguished road
Default

It's mostly higher compression ratio, and maybe a few complimentary tuning adjustments. But more compression makes more power.
Black Dog is offline   Reply With Quote
Old 10-12-2008, 02:34 AM   #3
Black Dog
Full Access Member
 
Black Dog's Avatar
 
Join Date: Feb 2008
Posts: 827
Black Dog is on a distinguished road
Default

They feel that a Cadillac owner should get a little something extra and changing the CR is easy to do just by altering the piston profile so I doubt if there is any real difference in the heads themselves toward altering it.
Black Dog is offline   Reply With Quote
Old 10-12-2008, 12:43 PM   #4
quikag
Full Access Member
 
Join Date: Oct 2008
Location: Dallas, TX
Posts: 74
quikag is on a distinguished road
Default

So the Escalade has different pistons that increase the CR. That, plus a few tuning tweaks gives it the extra 23hp? I find it interesting that they give the Sierra Denali 400hp, but only gave the Yukon Denali 380hp. For '09 the Yukon Denali is supposed to have the full 403hp.

Oh well, guess I'm stuck with my measly 380hp. I really thought it was just marketing hype that rated the 403 vs. 380 and rwhp was basically identical. I guess not.
quikag is offline   Reply With Quote
Old 10-12-2008, 12:47 PM   #5
ibobby
Full Access Member
 
Join Date: May 2008
Posts: 224
ibobby is on a distinguished road
Default

doesn't the Caddy weight a little more?

You also have to look at torque when talking horse power and speed.
ibobby is offline   Reply With Quote
Old 10-12-2008, 02:09 PM   #6
Vrrooom
Full Access Member
 
Join Date: Jan 2008
Location: Germantown, MD
Posts: 88
Vrrooom is on a distinguished road
Default

It could also just be under-rated... GM likes to do that. Especially since they have to put their flagship model on the pedestal. A GMC the same as a Cadillac? Impossible.
Vrrooom is offline   Reply With Quote
Old 10-12-2008, 05:12 PM   #7
quikag
Full Access Member
 
Join Date: Oct 2008
Location: Dallas, TX
Posts: 74
quikag is on a distinguished road
Default

Oh, I have a 2WD Yukon Denali and it's plenty fast for a daily driver truck. If I need speed I have my 480hp C6. That said, I thought it was odd that there is a true 23hp difference between the Slade and Yukon Denali. I thought it was just BS marketing and the power output was identical in reality.

It seems like a lot of work to have different pistons for the Yukon Denali and then use 'special' pistons for the Sierra Denali and Escalade.
quikag is offline   Reply With Quote
Old 10-12-2008, 05:55 PM   #8
Grounded
Tahoeforum Apprentice Member
 
Join Date: Oct 2007
Posts: 26
Grounded is on a distinguished road
Default

I was told that the engine's are one in the same. Just different tunes.....
Grounded is offline   Reply With Quote
Old 10-12-2008, 06:25 PM   #9
quikag
Full Access Member
 
Join Date: Oct 2008
Location: Dallas, TX
Posts: 74
quikag is on a distinguished road
Default

Quote:
Originally Posted by Grounded View Post
I was told that the engine's are one in the same. Just different tunes.....

That would make a lot more sense than use different engine internals...I was searching on google for an SAE tech article to explain the differences, but I could never find one on the 6.2L truck motors.
quikag is offline   Reply With Quote
Old 10-12-2008, 10:36 PM   #10
Black Dog
Full Access Member
 
Black Dog's Avatar
 
Join Date: Feb 2008
Posts: 827
Black Dog is on a distinguished road
Default

Whatever, but pretty sure I'm right...

Such as, there are 2 different 6.0L motors from a couple of years back, the LQ4 and LQ9, I think. The LQ4 has dished pistons, 9.4:1 Compression Ratio, and 300 HP. The LQ9 has flat-top pistons, 10:1 CR, and 345 HP. Maybe the rods are beefier or something but that's the jist of it. So this is GM's modus operandi.

I don't make this kind of stuff up anymore than GM would just take 2 identical motors and then give them each a different tune. Not without at least a different camshaft, etc. They don't usually just push the envelope like that; rather they try to optimize a set of parts with a set of criteria.

The muscle cars of the '60s just disappeared to weak-as-can-be smog motors in 1974. Why did they lose power? It wasn't the smog equipment, there were smaller carbs, but it was all about lowered compression ratio. Engines went from like 10.5:1 down to like 8:1, albeit gradually from 71-74.

While a timing advancing tune may require higher octane too, it is the case with the Caddy engines that they need higher octane because of the higher compression ratio. More compression= more heat= quicker pre-ignition.

Any more questions?

Last edited by Black Dog; 10-12-2008 at 11:43 PM.
Black Dog is offline   Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



 
Advertisement

Other Sponsors






All times are GMT -4. The time now is 01:51 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
All rights reserved and copyrighted
Fully Driven Auto Network
GM Truck Forum
Ford Raptor Forum
Dodge Ram Forum
Chevy Cobalt Forum
Chevy Camaro Forum
FJ Cruiser Forum
Ford Truck Forum
88-98 GM Truck Forum
73-87 Gm Truck Forum
Ford Expedition Forum
Chevy Equinox Forum
Chevy Cruze Forum
Jeep Liberty Forum
Jeep Forum
Dodge Ram SRT10 Forum
Chrysler 200 Forum
Scion xD Forum
Scion xB Forum
Dodge Challenger Forum
SRT Forum
Nissan Titan Forum
Buick Enclave Forum
Cadillac Forum
Cadillac XTS Forum
TRD Forum
Central US Mopars
Southeast Mopars
Cadillac CTS Forum
Oklahoma Dodge Ram Club
Softball Forum