Re: Advice on possible LS1 purchase please !!

Dawgz83948 Wed Jan 11, 2012 5:53 pm

My LT1 decision is looking better and better all the time. Wink

Rich L. Wed Jan 11, 2012 7:03 pm

Sounds like a good choice jayman. Same engine I'm running although mine is freshly rebuilt by a local shop. They upgraded the rods and cam like you're talking about and tuned it to 437hp. The pistons, heads and intake are all original LS1 parts, aluminum block too. We'll see how it does once I get the conversion completed.

Rich

jayman1869 Wed Jan 11, 2012 11:15 pm

I wanted to upgrade the rods and pistons to keep the bottom end from blowing.
I think I want to get the motor to around 450hp and keep it there.
With the weight reductions the car should be a screamer.... Laughing

docwyte Thu Jan 12, 2012 8:10 am

I ran an entire race season on my bone stock, (well, I do have a cam) '02 LS1 motor with no issues. There's no reason to get a cast block, the stock one is fine. The stock pistons and rods won't be an issue at 450hp, I'm making 375rwhp now, so pretty close to that with stock internals.

**948** Thu Jan 12, 2012 10:59 am

If the block is in good shape, go for the LS1 they are plenty fast. My wife's bone stock 2002 Camaro SS, with a slush box, does 13.2-13.3's all day long and that is with a 170K on the clock and her at the wheel Shocked

.
If the cylinder walls are out of spec, throw it in the trash; the LS Al blocks can't be over bored more than .010". Pick up an LQ9 block. Your LS1 crank, heads and conrods should swap over IIRC; you will need new pistons. The 6.0L LQ9 blocks can be bought new for ~$700 and can be bored out later if required.

docwyte Thu Jan 12, 2012 11:02 am

Are the LMQ blocks aluminum or iron? What pistons do you use in them? I easily keep up with my friends C5 Z06 (who has shorter gears) on the straights in my car, I suspect my car is a low 12 second car in the 1/4 mile.

**948** Thu Jan 12, 2012 11:27 am

docwyte wrote:Are the ~~LMQ~~ LQ9 blocks aluminum or iron? What pistons do you use in them? I easily keep up with my friends C5 Z06 (who has shorter gears) on the straights in my car, I suspect my car is a low 12 second car in the 1/4 mile.

The LQ9 blocks are iron, 6.0L. (Sorry, I corrected the code error. The other code is from something I am working on Laughing

) The stock pistons are the more common 4.000" bore.

The 2001 Z06s' have 385hp, the 2002 have 20 more. You should be able to pull on a stock C5 Z06, even with gears. Your cam really woke things up, IIRC. A move from 5.7L to 6.0L would also net you some more power.

jayman1869 Thu Jan 12, 2012 11:28 am

docwyte wrote:Are the LMQ blocks aluminum or iron? What pistons do you use in them? I easily keep up with my friends C5 Z06 (who has shorter gears) on the straights in my car, I suspect my car is a low 12 second car in the 1/4 mile.

Low 12's?
What setup are you running with your motor?
Stock internals, heads...etc??
What transaxel are you running and what 5th gear ado you have.

jayman1869 Thu Jan 12, 2012 11:30 am

948 wrote:If the block is in good shape, go for the LS1 they are plenty fast. My wife's bone stock 2002 Camaro SS, with a slush box, does 13.2-13.3's all day long and that is with a 170K on the clock and her at the wheel .
If the cylinder walls are out of spec, throw it in the trash; the LS Al blocks can't be over bored more than .010". Pick up an LQ9 block. Your LS1 crank, heads and conrods should swap over IIRC; you will need new pistons. The 6.0L LQ9 blocks can be bought new for ~$700 and can be bored out later if required.

I thought they could be bored over more if new sleeves were inserted?

docwyte Thu Jan 12, 2012 11:55 am

Stock 2002 SS motor, so it came with 241 heads and the LS6 intake manifold. Then I have S&P headers, dual 2.5" exhaust and an EPS cam. I'm making 375rwhp and am using the stock 944 Turbo S transaxle with a Spec stage 2 clutch and lightweight flywheel.

Like I said, the car is easily a match for my friends C5 Z06 and he has a shorter rear diff vs a stock vette.

Dawgz83948 Thu Jan 12, 2012 11:58 am

docwyte wrote:Stock 2002 SS motor, so it came with 241 heads and the LS6 intake manifold. Then I have S&P headers, dual 2.5" exhaust and an EPS cam. I'm making 375rwhp and am using the stock 944 Turbo S transaxle with a Spec stage 2 clutch and lightweight flywheel.

Like I said, the car is easily a match for my friends C5 Z06 and he has a shorter rear diff vs a stock vette.

Technically the C5 uses a transaxle like you......

jayman1869 Thu Jan 12, 2012 12:00 pm

docwyte wrote:Stock 2002 SS motor, so it came with 241 heads and the LS6 intake manifold. Then I have S&P headers, dual 2.5" exhaust and an EPS cam. I'm making 375rwhp and am using the stock 944 Turbo S transaxle with a Spec stage 2 clutch and lightweight flywheel.

Like I said, the car is easily a match for my friends C5 Z06 and he has a shorter rear diff vs a stock vette.

What flywheel/clutch combo are you using?
I was leaning towards a Fidanza flywheel because I have had success with them in the past, but undecided on the clutch.

docwyte Thu Jan 12, 2012 1:02 pm

I'm using the Spec stage 2 clutch and their lightweight flywheel. They make a clutch specifically for our swap, with the proper Porsche spline pattern.

I wouldn't use one companies clutch disk and and another companies flywheel. That's just inviting trouble. Spec also says that if you use the stock Chevy flywheel that you then need to get it balanced with their clutch setup before you install it.

xschop Thu Jan 12, 2012 1:18 pm

I do know for a fact that the Fidanza flywheel surface sets exactly 0.07" away from the face of the factory pilot bearing/1" LS adapter combo. If you use it you have to ensure your clutch disc hub will not hit it as it wears.

jayman1869 Thu Jan 12, 2012 1:51 pm

to keep thing simple, I will probably just go with the Spec cluth and flywheel kit then, that way I will have a nice matched set.
Thanks for the info.

Mon	Tue	Wed	Thu	Fri	Sat	Sun
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30