[Z06] REAL HP Difference between 2001 & 2002 LS6 ?
Thread Starter
Race Director
Joined: Apr 2005
Posts: 11,138
Likes: 11
From: Fremont CA
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20
NCM Sinkhole Donor
REAL HP Difference between 2001 & 2002 LS6 ?
Ok, I know that GM claimed a 20 HP gain on the LS6 in 2002. However, I also know that they do their engine Dyno with a complete intake, exhaust, and accessories on the engine. Lastly, I know that GM claims the following for 2002...
1. LS6 exhaust back pressure was reduced by 16%
2. Airflow over the LS6 MAF sensor was increased by removing grid work
3. MAF software was re calibrated
4. LS6 air cleaner housing had a larger intake.
5. 2004 introduced a new fuel system which carries over into the new C6.
So the big question is, what is the REAL HP difference between the two engines? Stated another way: If I used a 2001 engine, but made all the above listed changes, what would the true output be? A friend claims that there is really only a 7 HP real world difference in the base longblock - which seems about right to me.
1. LS6 exhaust back pressure was reduced by 16%
2. Airflow over the LS6 MAF sensor was increased by removing grid work
3. MAF software was re calibrated
4. LS6 air cleaner housing had a larger intake.
5. 2004 introduced a new fuel system which carries over into the new C6.
So the big question is, what is the REAL HP difference between the two engines? Stated another way: If I used a 2001 engine, but made all the above listed changes, what would the true output be? A friend claims that there is really only a 7 HP real world difference in the base longblock - which seems about right to me.
Thread Starter
Race Director
Joined: Apr 2005
Posts: 11,138
Likes: 11
From: Fremont CA
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20
NCM Sinkhole Donor
I understand that. I was listing the external components that are part of the equation. I know that if I changed EVERYTHING the. They would be identical. I'm just asking if I'm dropping a stock '01 motor into an '02 and using all the accessories / manifolds / etc from the '02, what is the real world difference in power?
Melting Slicks
Joined: Jul 2010
Posts: 3,355
Likes: 113
From: Los Angeles
I understand that. I was listing the external components that are part of the equation. I know that if I changed EVERYTHING the. They would be identical. I'm just asking if I'm dropping a stock '01 motor into an '02 and using all the accessories / manifolds / etc from the '02, what is the real world difference in power?
Safety Car
Joined: Oct 2004
Posts: 4,816
Likes: 132
From: Plano TX
Here is an interesting comparison article between the 2001 and 2002 LS6.. Very informative and good reading.. 2002 model LS 6 had a revised piston ring to eliminate piston slap as well as the oil burning issue too.. http://www.gmhightechperformance.com...e/viewall.html
Drifting
Joined: Oct 2009
Posts: 1,438
Likes: 4
From: Always in my lane.
I would like to chime in on a real world test. When I bought my 01Z, I took it out to the local dragstrip to see what it could do considering that it was a new car with a lotof hype attached. Low and behold, there was a fella there with an 02 model Z. Both of us couldnt resist trying to see what the differences were btwn the two cars. The condition of the track was excellent, temps were in the high 60 degree range, and both cars were bone stock. Both Zs left the line strong, the 02 edged out in front by about a car length. At the finish the 02 was in front by the same one car length. On run 2, we both came in the finish at the same time. Personally the 02 is a slightly stronger car, but its not much faster over the 01. Like I said,from my OWN PERSONAL EXPERIENCE. I bought the 01 and havent looked back since.
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Instructor
Joined: Jun 2010
Posts: 248
Likes: 1
From: TX
Another real world reference, on a close course I ran my 01'z with identical mods (full exhuast same size headers, cai, tune, & sticky tires) to a 02z and we were dead even each time. I do realize there could be variables ie. driver, the brand difference of his parts to mine but I truely was surprise of the outcome.
Safety Car
Joined: Oct 2004
Posts: 4,816
Likes: 132
From: Plano TX
Not true at all.. If you click on the link I posted above,, the story is there straight out of horses mouth and GM engineers worked hard to find a cam profile that made the same or more torque down at the bottom end as the 2001 cam, actually the 2002 cam made slightly more torque between 1200 and 1500 rpms and then its about even until 3500 rpm, where the 2002 cam takes off.. Here is a post of the dyno results
Last edited by David426; Feb 17, 2012 at 12:01 AM.
Drifting
Joined: Sep 2006
Posts: 1,335
Likes: 167
From: Truckee CA
I stand corrected.
But seat of the pants told us when Autocrossing and sharing cars (his an 02) we both thought that my 01 pulled harder on the bottom end, an his 02 on the top end of the RPM range. Both cars set up the same (SS SCCA rules).
Mark
But seat of the pants told us when Autocrossing and sharing cars (his an 02) we both thought that my 01 pulled harder on the bottom end, an his 02 on the top end of the RPM range. Both cars set up the same (SS SCCA rules).
Mark
Drifting
Joined: Oct 2006
Posts: 1,554
Likes: 13
From: Romeoville IL
You are always going to have car to car differences. Every engine off the assembly line isn't going to put out the exact same peak hp with the exact same dyno graph. You might just have a very solid '01, his air filter might have been dirtier, a mouse crawled into the muffler, who knows. :-)
Melting Slicks
Joined: Jul 2010
Posts: 3,355
Likes: 113
From: Los Angeles
Many people seem to be missing the point. The OP is only interested in the power difference between the 01 and 02 long block. Although there's a 20 hp difference in the factory rating, a good chunk of that comes from changes in the air intake system and exhaust manifolds, which are external bolt-ons and therefore irrelevant to this conversation.
Melting Slicks
Joined: Apr 2007
Posts: 2,107
Likes: 4
From: Northern VA
Then i would agree it's very minor after exhaust/intake changes. Cam profiles were different. With bolt-ons it's still going to be a tenth(10hp abouts) or so slower at the track so with most drivers it's negligible.
Drifting
Joined: Oct 2011
Posts: 1,980
Likes: 10
From: Crook County
I personally think the biggest thing is the air intake system... I tossed on a CAI and did some Borla Straight pipes and made 367/364 and that was with the car running 210* right after a 08 C6Z with a CAI and CB made 438RWHP, The guy who says 367 is the owner of the C6Z... The car has seen 12.1 @ 118 on street tires and 11.8 @ 116 on DR's... Everything else is stock on the car.... So really not a difference imo, If it came down to it and a 01Z were to run against a 02-04Z it would come down to the driver 99% of the time because thats how close they are in a real world environment...
Last edited by Breze84; Feb 19, 2012 at 04:51 PM.
