LS6 upgrades on 2000 C
Thread Starter
Instructor
Joined: Aug 2009
Posts: 103
Likes: 4
From: Galt CA
LS6 upgrades on 2000 C
Hi my name is Rick my wife and I just bought a 2000 C5 six speed wiht Z51 supension. We love the car but I can`t leave anything alone. I have been racing for years but I am not sure about what I can do on this car. I live in California so I am limited on what I can get away with....Ok finaly the question I have decided to upgrade to LS6 heads...Already bought a brand new set and LS6 intake and I am going to install a new cam about 224 to 228 duration on a 114 lobe center and about 550 lift cold air intake and exhaust. What I am not sure about is will a LS6 throttle body plug in and work on a 2000 and do I need it also will a 2001 to 2004 LS6 Mass Aif Flow work on a 2000 Don`t know if the conection is different or the computer in the car will work with it. I have tryed to look this up and can`t find it I am also going to have the car tuned after I am done any help would be apreciated thanks....Rick
Last edited by R CRYSIS; Aug 21, 2009 at 06:33 PM.
Racer
Joined: Oct 2007
Posts: 380
Likes: 0
From: Knoxville Tennessee
The MAF will work if you buy the harness adapter (like $10 from Ebay) and the TB should bolt right up, no changes needed.
I wouldn't change your TB though, I don't think they are any different from a 2000. I would do the MAF though cause it's a little bigger at 85mm. You'll have to be sure the cold air intake you get is for a 2001+ though, and then you'll have to drill a hole in your cold air intake for the air temp sensor (I'm going though the same thing right now with my 2000 with an LS3/L92 swapped car.)
I wouldn't change your TB though, I don't think they are any different from a 2000. I would do the MAF though cause it's a little bigger at 85mm. You'll have to be sure the cold air intake you get is for a 2001+ though, and then you'll have to drill a hole in your cold air intake for the air temp sensor (I'm going though the same thing right now with my 2000 with an LS3/L92 swapped car.)
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The MAF will work if you buy the harness adapter (like $10 from Ebay) and the TB should bolt right up, no changes needed.
I wouldn't change your TB though, I don't think they are any different from a 2000. I would do the MAF though cause it's a little bigger at 85mm. You'll have to be sure the cold air intake you get is for a 2001+ though, and then you'll have to drill a hole in your cold air intake for the air temp sensor (I'm going though the same thing right now with my 2000 with an LS3/L92 swapped car.)
I wouldn't change your TB though, I don't think they are any different from a 2000. I would do the MAF though cause it's a little bigger at 85mm. You'll have to be sure the cold air intake you get is for a 2001+ though, and then you'll have to drill a hole in your cold air intake for the air temp sensor (I'm going though the same thing right now with my 2000 with an LS3/L92 swapped car.)
And as far a the TB is concerned just P/P and youwill think you picked up 25 hp (seat of the pants)
really about 5 to 8 hp-Good luck
Instructor
Joined: Sep 2006
Posts: 124
Likes: 0
From: Chesapeake VA
There is no difference between the LS6 and LS1 throttle bodies, don't waste your money here. The LS6 MAF is an 85mm and does not have a screen so it flows a little better. It also has the temp sensor integral to the MAF so you will need a wiring harness adapter. PACE sells them. Your air box and coupler will also need to be upgraded to 2001 units or aftermarket to fit the 85mm MAF. You will need to have your PCM tuned to use it as your car will not run properly with the different MAF and the 78mm MAF tables in your PCM. Since you are installing heads and a cam, adding the 85mm MAF is a good option. You may have to trailer the car to the tuner though. I had my tuner install mine as he did not recommend driving it with the 85mm MAF.
Thread Starter
Instructor
Joined: Aug 2009
Posts: 103
Likes: 4
From: Galt CA
Thanks for the info. I will get a harness and just have my throttle body polished. I also had a question about the fuell injectors do I need to replace them? And if so will LS6 injectors be enough or should I go to aftermarket injectors. Also I have seen alot of crossover pipes for the car but when I looked under the car it allready has one from the factory do the aftermarket ones even help? Also I can`t run long tube headers here and I would like to help it breath a little better they make C.A.R.B certified shorty headers for the car I know they would help a little but not much. I was wondering if the ZO6 exhaust manifolds would make much of a difference I know the smog tubes are different not even sure if I could make them work. I apreciate you guys giving me input I am sure you have gone over all of this before I just can`t find it and I am sure I will have more questions.....Thanks Rick:
Drifting
Joined: Apr 2008
Posts: 1,510
Likes: 15
From: Ga
Rick,
Sent you a PM.
Sent you a PM.
Thanks for the info. I will get a harness and just have my throttle body polished. I also had a question about the fuell injectors do I need to replace them? And if so will LS6 injectors be enough or should I go to aftermarket injectors. Also I have seen alot of crossover pipes for the car but when I looked under the car it allready has one from the factory do the aftermarket ones even help? Also I can`t run long tube headers here and I would like to help it breath a little better they make C.A.R.B certified shorty headers for the car I know they would help a little but not much. I was wondering if the ZO6 exhaust manifolds would make much of a difference I know the smog tubes are different not even sure if I could make them work. I apreciate you guys giving me input I am sure you have gone over all of this before I just can`t find it and I am sure I will have more questions.....Thanks Rick:
Instructor
Joined: Sep 2006
Posts: 124
Likes: 0
From: Chesapeake VA
The ZO6 exhaust manifolds will flow better than the 2000 ones, probably comparable to shorty headers. Your stock H pipe has the pup cats and main cats, so an after market X pipe with high flow cats will help, but these are designed to go with long tube headers, so you will have to modify your H pipe if you want to use one, which may cause you problems passing a smog check. If you are sticking with stock exhaust manifolds I would get some ZO6 manifolds and stay with what you have downstream. The 26# injectors will probably limit you and be near their max cycle time. 28# may be enough, but I recommend you go 30# or discuss with your tuner
Drifting
Joined: Apr 2008
Posts: 1,510
Likes: 15
From: Ga
ZO6 Manifolds are not that much different than the stock 2000's. I thought of that route but went with the shorties. they were lighter, flowed better, and looked much better under the hood. 
The ZO6 exhaust manifolds will flow better than the 2000 ones, probably comparable to shorty headers. Your stock H pipe has the pup cats and main cats, so an after market X pipe with high flow cats will help, but these are designed to go with long tube headers, so you will have to modify your H pipe if you want to use one, which may cause you problems passing a smog check. If you are sticking with stock exhaust manifolds I would get some ZO6 manifolds and stay with what you have downstream. The 26# injectors will probably limit you and be near their max cycle time. 28# may be enough, but I recommend you go 30# or discuss with your tuner
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