www.chirpthird.com: Just installed LS6 in 99 SS but no more power

This is topic Just installed LS6 in 99 SS but no more power - HELP! in forum F-Body: Convertibles at www.chirpthird.com.

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Posted by Ray R (Member # 1956) on :

I just installed a new LS6 405 HP engine in my 99 Camaro SS convertible. Unfortunatly the performance is the same and the Chevy dealership I bought the engine from, as well as two others are lost on what to do. Has anyone ever installed the LS6 and if so, do I need to reprogram the computer or what?? Is something like this covered under warrenty even though an outside agent installed the engine?

Thanks
Ray Rhoe

Posted by Gary 97 WS6 T/A Conv (Member # 1504) on :

Man that SUCKS! I don't know how to help you I'm not up to speed on the LS? platform.

Did you try the LS1.com and LS1tech.com tech sections?

Best of luck to you, sorry I couln't help. [Frown]

Posted by JohnnyBs98WS6Rag (Member # 1028) on :

The latest issue of Hot Rod has an aritcle about putting the crate LS6 into an Chevelle. They said that although you could order a harness and PCM for that installation, the only PCM that was currently available was for a LS1 and that it required a custom flash for it to work properly w/ the LS6. While they were hooking it to a 4L65E trans, I don't know if that was the only reason (all factory LS6 installations have a 6M).

My guess is YES you need a new / reflashed PCM.

Posted by Steve da Wrench (Member # 1301) on :

Yes, you need to reflash your pcm. Then have it tuned by someone who knows LS1 edit as well to make it run its best.

To install that engine and not tune it, is like removing a 2bbl 283 engine in older car, replacing it with a 502, but leaving the 2bbl on it. It just will not work correctly or to its best behavior unless tuned properly. Good luck, I am sure you will love it once you are all done [Smile]

Posted by Z28-SORR (Member # 1565) on :

The 405hp is based on the high flow intake ducts, filters, ect. and the titanium or better exhaust. If you leave the stock Camaro LS1 intake and exhaust on it you'll probably not get the full 405.

Posted by ss_rs_z (Member # 1888) on :

In case missed the other thread here is the addy for you and hope it helps. http://www.chevroletpower.cz28.com/custom3.html

Good Luck [Big Grin]

Posted by JEB (Member # 1962) on :

In 2002 a statement came out of Chevy that the LS-1 engine is a detuned LS-6 engine they are matched. do not believe the 325HP advertisement [Cool]

. The Horsepower of the LS1 is more. The corporate Bigwigs at Chevy would not let the camaro outshine the Corvette. So the corvette always had a little more.. But not that much more. You probablely would not notice the difference between the two motors.....

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