LS3 C5 conversion thread
Safety Car
Joined: Apr 2004
Posts: 3,932
Likes: 8
From: Hayward California
Interesting. My buddies with '08 LS3 cars have borrowed my (stock) LS2 throttle body to dyno against their ported stockers to see if there were any gains. There weren't. 
I had to use this wiring harness to hook up my LS2 TB to my ECM:
http://www.casperselectronics.com/st...oducts_id=1087
Maybe the '09 TB is different?
I have gotten the code you mention once, it was because I forgot to plug the TB in. :embarrassed:
I had to use this wiring harness to hook up my LS2 TB to my ECM:
http://www.casperselectronics.com/st...oducts_id=1087
Maybe the '09 TB is different?
I have gotten the code you mention once, it was because I forgot to plug the TB in. :embarrassed:
Btw.. Congrats on getting yours up and running and it seems like, running real well
Last edited by AVB; Apr 19, 2010 at 03:49 PM.
Race Director
Joined: Dec 2004
Posts: 13,760
Likes: 75
From: Haymarket VA
28-30 is good. My first setup I ran 12:1 CR and could only add 24-25 degrees of timing. Lowered to 11:3 and could run 28-30 degrees and picked up about 15-20RWHP IIRC.
Racer
Joined: Dec 2008
Posts: 486
Likes: 0
From: Converse Texas
I notice that you do not have a regulator on the fuel rails. Did you have to change anything in the fuel system, or can you run with no regulator??? I'm switching to a ported ls2 intake as soon as my casper harnesses arrive, and the only thing I am unsure of is the regulator...
Thread Starter
Pro
Joined: Sep 2005
Posts: 593
Likes: 5
From: Murphy TX
I notice that you do not have a regulator on the fuel rails. Did you have to change anything in the fuel system, or can you run with no regulator??? I'm switching to a ported ls2 intake as soon as my casper harnesses arrive, and the only thing I am unsure of is the regulator...
Racer
Joined: Jul 2007
Posts: 384
Likes: 0
From: Suffolk Virginia
Digging up an old thread, do the LS3/7 rails connect in the same location as C5 stuff? Looking to either use LS3 or 7 rails (depending on whats on ebay) for a stock looking setup. Just wondering if they are almost plug and play (other than injector harnesses) with the stock C5 fuel lines.
Thread Starter
Pro
Joined: Sep 2005
Posts: 593
Likes: 5
From: Murphy TX
Digging up an old thread, do the LS3/7 rails connect in the same location as C5 stuff? Looking to either use LS3 or 7 rails (depending on whats on ebay) for a stock looking setup. Just wondering if they are almost plug and play (other than injector harnesses) with the stock C5 fuel lines.
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Drifting
Joined: Jul 2009
Posts: 1,319
Likes: 64
From: Lakeville, MA
St. Jude Donor '10
I have the (as far as I know) correct tables for the LS3 injectors for hptuners for the gen 3 pcm that I'll post when I get a chance, but they're on my PC laptop and I'm surfing on the mac at the time. It's not an obvious translation from one to the other but I used a 2008 C6 tune to derive the tables and driveability is pretty good so I'm pretty confident they're at least close enough to correct to work.
