: ls6 or ls2 cts v?



03cobrarocks
07-15-13, 03:41 PM
Hello all!

I just signed up for this site as I am looking into getting rid of my truck and modded cobra to have one car that is fun and can comfortably fit 3 or 4 people.


I am not really familiar with the lsx world could someone please tell me which one I am better of getting? I can get the 04 with the ls6 considerable cheaper and dont mind doing so if the performance difference is negligible.

I am under the impression that most things are interchangeable between the ls1, ls2, ls3, ls6?


Only other thing is I am really worried about traction in these cars.. It looks like you cant really get a wide tire out back without mini tubbing or getting a wide body.. How is the traction with good tires are this car? Can you get 18x.9.5s to fit on the rear without it poking out too much?

I really dont have big plans for the car right of the bat, defiantly full exhaust, intake and tune. With cam and heads later on but not for awhile.

Any ideas or advice is appreciated

CTS-V_07
07-15-13, 04:27 PM
Traction isn't something I would worry about with these cars it's the wheelhop and the weak diff. There is ways to fix these issues. A 8.8 is almost a must IMO. I like the ls2 that's why I bought a 07 but both engines are great platforms to build off of. I have owned a c6 and two gto and I have to say I love my cts-v.

carlson_mn
07-15-13, 04:48 PM
Both engines are equally fast and respond well to mods. I wouldn't say a replacement diff is a must unless you are into drag racing the car. I drive the car fast from time to time and I don't have any traction issues. You just have to realize it isn't meant for hard launches. Tons of info on this subject just read up.

CTS-V_07
07-15-13, 04:58 PM
I did says it was a almost must lol...

RyRidesMotoX
07-15-13, 05:23 PM
The LS6 is 5.7, LS2 is 6.0, they are both cathedral port heads, LS3 has a rectangular port head and are not interchangeable with the LS1,2,6 motor stuff. The power is basically the same in the 2 motors. The LS6 has slightly different valve train componentry. Both have 243 head castings I believe... But the cam and valves are different in the LS6. All in all the LS is a good motor and has good reliability and longevity unless it has been egregiously beat on or maintenance is lacking.

Note: I am like 6'2 and with how far back I have to put the driver's seat, it would be fairly cramped back there. But the only person that rides in the back is my kid in the baby seat so its not a big deal really. Remember it was competition for the older m3 so its about that size (probably a little bigger actually). Good luck in your search. Check the classifieds on here, there are some being sold at pretty reasonable price levels

03cobrarocks
07-15-13, 07:23 PM
Traction isn't something I would worry about with these cars it's the wheelhop and the weak diff. There is ways to fix these issues. A 8.8 is almost a must IMO. I like the ls2 that's why I bought a 07 but both engines are great platforms to build off of. I have owned a c6 and two gto and I have to say I love my cts-v.

O goody sounds familiar.. I had to swap out my IRS out of my 03 cobra becuase I could not stand the wheel hop... This car wont be taken to the track more then likely, so not sure If I will do that here.

I assume there are braces and bushings that can help protect the differential and help stop wheel hop?

JFensty
07-15-13, 10:55 PM
General consensus is get the red cradle bushings, blue or red diff bushing from revshift and g force axles. Wheel hop issue fixed....
However I didn't do axles just diff and cradle bushings and after a track day and many burnouts, very little hop even in rain.

GM4lyfe
07-16-13, 12:39 AM
Most things are interchangeable. Mod for mod the LS2 will come out ahead because of the extra displacement. Hence the LS2 uses the 01 385hp LS6 cam. The LS2 4.00 inch bore will allow you to use the latest and greatest heads from an L92/LS3. Just depends on your goals. I'm not turn you off of the LS6 its a really good motor.

BigDaddy-V
07-16-13, 01:36 AM
When I was looking to get mine I had originally wanted the LS2 because of it slightly larger but owning the LS6 I am very pleased and like some will tell you a more true race motor vs a "truck" motor!

Someone had to say it! HEHEHE

BDV

H-town_V
07-16-13, 01:51 AM
The ls6 is a more rev happy motor and most enthusiast also want it because its more exclusive. Plus the ls2 has it's flaws, it lacks the sodium filled valves and it's TB is considered the worst that GM makes.

RyRidesMotoX
07-16-13, 03:07 AM
O goody sounds familiar.. I had to swap out my IRS out of my 03 cobra becuase I could not stand the wheel hop... This car wont be taken to the track more then likely, so not sure If I will do that here.

I assume there are braces and bushings that can help protect the differential and help stop wheel hop?

That 8.8 retains the independent rear setup... Its from a Lincoln mark vii or a t-bird. The V was made for a road course... If you end up getting one, give it a spin, you'll be glad you did. Oh and go on YouTube and look up the videos of the cammed Vs with long tubes and stuff. It doesn't sound any different than a vette or a camaro or any other LS motor... bbbuuuttt its coming from a CADILLAC... That makes it so much note worth it right there.

PISNUOFF
07-16-13, 07:39 AM
The ls6 is a more rev happy motor and most enthusiast also want it because its more exclusive. Plus the ls2 has it's flaws, it lacks the sodium filled valves and it's TB is considered the worst that GM makes.

Well......not so much more 'rev happy'. Having driven and tuned both with varying mods I can say there isn't much difference in the upper rpms. The LS2 does have more torque in the lower rpms that is noticeable.

The throttle body on the LS2 is electronic versus the drive by wire LS6. It is also 90mm vs the 76mm LS6 and flows more air.

I think you were meaning to say the intake manifold is arguably the worst GM ever released for production. This is true but it's not an order of magnitude worse.

Basically it's a wash between the two motors in the V. If you go with heads and cam in the future then it's really going to depend on what you want to use. Yes, you can't use the stock casting LS3 heads on anything less than a 4.00" bore but there are plenty of heads that make power for the LS6. If you're bent on going with LS3 heads to save money you have to consider that you'll need a rectangular port intake manifold that will suck up any savings you made on the heads. Just buy whatever V you find with the best deal, you'll be happy....after you install GeForce axels at a minimum.

HAMSTAR
07-16-13, 08:18 AM
If I had to do this all over again, I'd get a low mileage 04, swap in an 8.8 and go twin turbo. Be at the same total cost a an 06-07 and FI doesn't care about displacement.

H-town_V
07-16-13, 03:23 PM
Well......not so much more 'rev happy'. Having driven and tuned both with varying mods I can say there isn't much difference in the upper rpms. The LS2 does have more torque in the lower rpms that is noticeable.

The throttle body on the LS2 is electronic versus the drive by wire LS6. It is also 90mm vs the 76mm LS6 and flows more air.

I think you were meaning to say the intake manifold is arguably the worst GM ever released for production. This is true but it's not an order of magnitude worse.

Basically it's a wash between the two motors in the V. If you go with heads and cam in the future then it's really going to depend on what you want to use. Yes, you can't use the stock casting LS3 heads on anything less than a 4.00" bore but there are plenty of heads that make power for the LS6. If you're bent on going with LS3 heads to save money you have to consider that you'll need a rectangular port intake manifold that will suck up any savings you made on the heads. Just buy whatever V you find with the best deal, you'll be happy....after you install GeForce axels at a minimum.

So... Is a ls2 TB a good upgrade over the ls6. Will it add power? or is it pointless without a fast intake.

03cobrarocks
07-16-13, 06:18 PM
If I had to do this all over again, I'd get a low mileage 04, swap in an 8.8 and go twin turbo. Be at the same total cost a an 06-07 and FI doesn't care about displacement.

Heck yea! Love me some turbos!

PISNUOFF
07-16-13, 06:52 PM
So... Is a ls2 TB a good upgrade over the ls6. Will it add power? or is it pointless without a fast intake.

The 76mm flows enough for heads/cam/intake/exhaust. Once you start getting into larger displacement then you'd need to consider a larger TB.

GM4lyfe
07-17-13, 04:15 AM
The ls6 is a more rev happy motor and most enthusiast also want it because its more exclusive. Plus the ls2 has it's flaws, it lacks the sodium filled valves and it's TB is considered the worst that GM makes.
I know what you mean between rev happy LS6. LS2 is said to be a lazy motor compared to the LS6 and it is true. They make the same peak power but how they get there is two different animals. The hollow stemed valves allowed GM to squeeze the extra two to three hundred rpms on the top end and kept them cooler. Stock solids are fine. Independent testing has proven that the LS2 intake flows a little worse than the LS6. Its just because GM changed their casting process. Its not enough of a henderance to discourage a buyer. Stock LS2 intakes have been ported.

Long story short OP get whatever you want. there is a laundry list of pros and cons to the LS2/LS6, mods, what have you. It depends on how far you gonna go. If you shop for parts right there is not a big price difference between the two. I've modded LS1s, LS6, LS2s, and LSA motors.

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LS3 heads to save money you have to consider that you'll need a rectangular port intake manifold that will suck up any savings you made on the heads.
Depends. Between the Corvette, Camaro, Trucks. There are plenty of people doing or has done heads, cam, intake swaps. You can find parts at a reasonable price. The stock LS3 head will flow more than a stock 243 head and some case ported ones too. And they are fairly inexpensive. A set of brand new complete LS3 heads is less than $1K. Seeing how many folks are going with the 92, 102, ect intakes nowadays.

03cobrarocks
07-17-13, 01:47 PM
Thanks all!

So it seems I should be more concered about getting a low mileage well maintained car than ls2 vs ls6

And if I ever decide to mildly/heavily modify it appears that it wont matter much anyway

RyRidesMotoX
07-17-13, 01:59 PM
Well maintained is the most important part.

mackey
07-17-13, 02:25 PM
Well maintained is the most important part.QFT

even a higher mileage one is fine. if i had to do it all over again, i'd get a higher mileage (picked up an 05 with 27k mi bone stock) one but with the mods i wanted to do already in (bushings, suspension, wheels, etc).

lollygagger8
07-18-13, 10:31 AM
I did heads/cam/102 FAST/TB on my LS6 and it's pretty awesome, but whatever you do you'll just want more. You get to 450HP, you want 550HP. You get to 550, you want 650HP, and so on.

Whatever you get, just fix the wheelhop first. I did a GForce 9" and it rules. But at the very least get their axles.

pato
07-18-13, 10:47 AM
I did heads/cam/102 FAST/TB on my LS6 and it's pretty awesome, but whatever you do you'll just want more. You get to 450HP, you want 550HP. You get to 550, you want 650HP, and so on.

Whatever you get, just fix the wheelhop first. I did a GForce 9" and it rules. But at the very least get their axles.

What did your Mamofied setup get you?

lollygagger8
07-19-13, 10:47 AM
What did your Mamofied setup get you?

Only got road tune and no dyno yet. I'm guessing 450ish since my 9" will rob some HP.

Bewbzout
07-20-13, 12:48 PM
Not to thread jack but how do you put in a 8.8 in a cadillac?

RyRidesMotoX
07-20-13, 01:35 PM
Not to thread jack but how do you put in a 8.8 in a cadillac?

Magic... Like the story about then shoemaker and those elves that filled his shelves one night lololol I kid, I kid

Seriously though: What was happening was that people were turning their differentials into little anti personnel fragmentation mines due to wheel hop. So as is the way with cars, people found a rear end that fit and it was a Ford 8.8 inch. The other advantage to the 8.8 is that you can get it in an independent rear setup already out of a 80s-90s t-bird, Lincoln mark IIV, and a few of the svt mustangs. So as has always been the way with things Ford's rear end is one of the better ones because its cheapish, and its fairly solid and its easily available in a junkyard. So creative steel made mounting gadgetry, spec'd a new driveshaft and new axles (since the lengths of all that changed) and GeForce did all that for the 9" rear end, cuz 9"ers are even better.