LS2 throttle body in a C5??? Hook ups same or different?
Thread Starter
Burning Brakes
Joined: Mar 2010
Posts: 1,189
Likes: 4
From: Freeport, FL
LS2 throttle body in a C5??? Hook ups same or different?
Simple question, are the plugs for the LS1 and LS2 TB's the same? I may look into using an LS2 TB.
Don't worry guys, I know the difference in the bore sizes, etc. Just curious if the harness in my car will plug right into the LS2 TB.
Thanks in advance
Don't worry guys, I know the difference in the bore sizes, etc. Just curious if the harness in my car will plug right into the LS2 TB.
Thanks in advance
Thread Starter
Burning Brakes
Joined: Mar 2010
Posts: 1,189
Likes: 4
From: Freeport, FL
Pro
Joined: Feb 2003
Posts: 623
Likes: 11
From: Ankeny IA
Yup. I'm running an LS2 TB with a wiring adapter right now. I did remove the LS1 connectors and soldered the wires to make it cleaner, but you certainly don't have to.
Hinson sells one:
http://www.hinsonsupercars.com/p-934...r-harness.aspx
Hinson sells one:
http://www.hinsonsupercars.com/p-934...r-harness.aspx
Race Director
Joined: Sep 2005
Posts: 11,060
Likes: 291
From: Pasco WA
You "know about the bore sizes, etc." so I assume you know the LS2 TB doesn't fit a LS6 intake manifold?
Thread Starter
Burning Brakes
Joined: Mar 2010
Posts: 1,189
Likes: 4
From: Freeport, FL
VETTENUTS - I have eliminated the PCV system so no biggie there.
ZEEVETTE - I don't have the LS6 intake anymore. But, I do realize that in addition to larger bore size, the LS2 is also a 4 bolt mount whereas the LS1 is a 3 bolt. I have the means to emlarge the opening of my intake and make an adapter and then it would be a simple bolt-on part.
Thanks guys, I think I have all the info. I am playing with this idea and also the thought of boring the stock TB to 85mm. I'm not trying to be cheap, I'm just playing and seeing what can be done.
ZEEVETTE - I don't have the LS6 intake anymore. But, I do realize that in addition to larger bore size, the LS2 is also a 4 bolt mount whereas the LS1 is a 3 bolt. I have the means to emlarge the opening of my intake and make an adapter and then it would be a simple bolt-on part.
Thanks guys, I think I have all the info. I am playing with this idea and also the thought of boring the stock TB to 85mm. I'm not trying to be cheap, I'm just playing and seeing what can be done.
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Thread Starter
Burning Brakes
Joined: Mar 2010
Posts: 1,189
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From: Freeport, FL
Tech Contributor
Joined: Dec 1999
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
I seriously doubt that you will be able to bore out that LS1 TB. Your probably going to hit a coolant passage or casting void before you ge to 85MM. Just my guess..
LS2 TB is a MUCH better design and has much more flexability.
BC
LS2 TB is a MUCH better design and has much more flexability.
BC
Thread Starter
Burning Brakes
Joined: Mar 2010
Posts: 1,189
Likes: 4
From: Freeport, FL
That's what I'm thinking too, and why I'm exploring both routes. I will try both and report results, be they good or bad.
I would like to bore the stock TB if possible and keep a stock look, for the most part. I am not worried about the coolant passage and if I hit a void I will make use of JB Weld
If I keep the stock TB anyways, I will be "porting" myself (actually just smoothingit out like everyone else, and calling it ported
) and going a step further and filling in that "notch" that allows air for the PCV system and drilling a small hole in its place, and also blending the back side so it matches my manifold, kinda creating a venturi type thingy-bobber 
Pro
Joined: Feb 2003
Posts: 623
Likes: 11
From: Ankeny IA
That's what I'm thinking too, and why I'm exploring both routes. I will try both and report results, be they good or bad.
I would like to bore the stock TB if possible and keep a stock look, for the most part. I am not worried about the coolant passage and if I hit a void I will make use of JB Weld
If I keep the stock TB anyways, I will be "porting" myself (actually just smoothingit out like everyone else, and calling it ported ) and going a step further and filling in that "notch" that allows air for the PCV system and drilling a small hole in its place, and also blending the back side so it matches my manifold, kinda creating a venturi type thingy-bobber
I would like to bore the stock TB if possible and keep a stock look, for the most part. I am not worried about the coolant passage and if I hit a void I will make use of JB Weld
If I keep the stock TB anyways, I will be "porting" myself (actually just smoothingit out like everyone else, and calling it ported
) and going a step further and filling in that "notch" that allows air for the PCV system and drilling a small hole in its place, and also blending the back side so it matches my manifold, kinda creating a venturi type thingy-bobber Honestly an LS2 with a matching intake is your best bet. If you can't swing that, then you would be better off ascertaining how far you can bore the intake and then fashion an adapter to affix the LS2 TB to. It will be much easier tune for and allow you to grow into a better intake in the future.
Thread Starter
Burning Brakes
Joined: Mar 2010
Posts: 1,189
Likes: 4
From: Freeport, FL
Keep in mind that even if you can bore out the TB to the size you want, you'll have to size the throttle blade just right. Excess air leakage can be a bear tune, too much and you may not be able to get it tuned to your satisfaction.
Honestly an LS2 with a matching intake is your best bet. If you can't swing that, then you would be better off ascertaining how far you can bore the intake and then fashion an adapter to affix the LS2 TB to. It will be much easier tune for and allow you to grow into a better intake in the future.
Honestly an LS2 with a matching intake is your best bet. If you can't swing that, then you would be better off ascertaining how far you can bore the intake and then fashion an adapter to affix the LS2 TB to. It will be much easier tune for and allow you to grow into a better intake in the future.
I have found an adapter but would probably machine my own.
My intake would support the machining to match up to the 90mm if I go with the LS2, but again, I'm just kinda playing around.
I do like the looks of the LS2, it really seems to be a much nicer design form the start.
Race Director
Joined: Sep 2005
Posts: 11,060
Likes: 291
From: Pasco WA
There's a company that makes a LS6 manifold with a LS2 snout refitted. That'd be a simple way to do it, but really, a FAST, ported, is a much better performer. Why make it more difficult, and almost as expensive?
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
That's what I'm thinking too, and why I'm exploring both routes. I will try both and report results, be they good or bad.
I would like to bore the stock TB if possible and keep a stock look, for the most part. I am not worried about the coolant passage and if I hit a void I will make use of JB Weld
If I keep the stock TB anyways, I will be "porting" myself (actually just smoothingit out like everyone else, and calling it ported ) and going a step further and filling in that "notch" that allows air for the PCV system and drilling a small hole in its place, and also blending the back side so it matches my manifold, kinda creating a venturi type thingy-bobber
I would like to bore the stock TB if possible and keep a stock look, for the most part. I am not worried about the coolant passage and if I hit a void I will make use of JB Weld
If I keep the stock TB anyways, I will be "porting" myself (actually just smoothingit out like everyone else, and calling it ported
) and going a step further and filling in that "notch" that allows air for the PCV system and drilling a small hole in its place, and also blending the back side so it matches my manifold, kinda creating a venturi type thingy-bobber 
For the PCV Vent, obtain a brass tube the same size as the vent line and and neck down one end and insert it into the vent line opening i the TB void. Then put your JB Weld in the void and around the metal pipe. Once it cured, just grind /machine the JB Weld and tube and it will blend into the TB opening on an angle like it was made that way. It looks a LOT better than a hole drilled into the epoxy that may chip and crack later down the line.
Take some pictures. Sounds like a cool project. Heres a LS1 TB that I did some light SHAPING and polishing to:
Heres the LS2 TB that I ported for my C6 Coupe:
BC
Thread Starter
Burning Brakes
Joined: Mar 2010
Posts: 1,189
Likes: 4
From: Freeport, FL
ZEEVETTE - I don't look at it as making it harder, but rather as a way to bond with my baby. Sometimes I feel she doesn't realize just how much I love her and it's when I take those few extra moments to show her just how special she is that I know she understands just how special she really is to me 
BILL - I was thinking about using a piece of tubing, but I will most likely not even have a port for the PCV system. That is, if I go the ported LS1 TB route.
It'll be a few weeks at least before I even have a TB to mutilate. I imagine I will try to port the LS1 TB either way. I'll post results, good or bad. lol
BILL - I was thinking about using a piece of tubing, but I will most likely not even have a port for the PCV system. That is, if I go the ported LS1 TB route.
It'll be a few weeks at least before I even have a TB to mutilate. I imagine I will try to port the LS1 TB either way. I'll post results, good or bad. lol
