New Track Times

[Bell Curve]

Originally Posted by Pete

I never really did a before and after on the UD pullies but i'm sure they help some and i also prefer the rotating wieght savings, they are half the wieght of the stock steel pieces.

Pete

Wish you had because it would be nice to see if it is worth the expense.

[Pete]

Originally Posted by Bell Curve

Wish you had because it would be nice to see if it is worth the expense.

I look at it this way i spend almost $3k for headers & exhaust to gain 20 HP
I spend $250 to save
1.dead wieght
2.rotating weight
3.they are UD pullies
If they make 3-5 HP they were worth every penny if not,
then 2 out of 3 ain't bad for the money.
Also it wasn't a worth while mod to spend $200 for dyno time on an item the costs the same as dyno time.

Pete

Originally Posted by Greybeard ZR1

I removed them. You're right, that SS is quite heavy. I pulled the pass. seat and the spare tire too. It allowed me to get my best ever time of 12.06@117mph.(1.76 -60ft.). Not too shabby for a stock motor 91'. This car used to embarrass C5 ZO6's all the time at my local strip. But I'd like to do the top end, like you have, and go hunting C6 ZO6's

i said before month ago in CF , i post thread saying that ZR1 will embarrass 06z06, but all get angry and hate me .
i know what Zr1 and LT5 is capable of !
listen, why dont you try open headers and see the gain, and ET after that.
i want someone to do that and see what our Zr do in track!

[WB9MCW]

Wonder what we will do to our ZR-1's in order to take the new ZR1 in 2008?

TT?



At 650+ HP it is not going to be easy to beat this new beast!!!

[Pete]

Originally Posted by HADI-ZR1

i said before month ago in CF , i post thread saying that ZR1 will embarrass 06z06, but all get angry and hate me .
i know what Zr1 and LT5 is capable of !
listen, why dont you try open headers and see the gain, and ET after that.
i want someone to do that and see what our Zr do in track!

Hadi, i find it funny how some still think small ports,with exhaust backpressure will make more power. LMAO

I know a 350ci LT5 can make very streetable 500 RWHP.

Pete

[Pete]

Originally Posted by WB9MCW

Wonder what we will do to our ZR-1's in order to take the new ZR1 in 2008?

TT?



At 650+ HP it is not going to be easy to beat this new beast!!!

Bryan nothing, it's a Corvette and a great Corvette at that.
But if you had to, a nice 385ci LT5 should do the trick
Bryan will you be able to make it to Byron on the 20th.
Pete

[WB9MCW]

Sorry Pete out of town that Sunday the 21st for 4 days--

Do not think I can ditch Mama the day b4 w/o paying the piper so have to pass on this one.

I know bring her with to the event -- I'll try but I bet I won't get my way on it.

[Greybeard ZR1]

Originally Posted by HADI-ZR1

i said before month ago in CF , i post thread saying that ZR1 will embarrass 06z06, but all get angry and hate me .
i know what Zr1 and LT5 is capable of !
listen, why dont you try open headers and see the gain, and ET after that.
i want someone to do that and see what our Zr do in track!

Actually, I have done that. After I ran the car with headers, no cats, 3" X pipe, and B&B 3" exhaust with no mufflers, I pulled the exhaust off and left open headers. The result, a reduction in trap speed, (therefore power).
I think it's because the ZR1 headers are relatively short, and also because I think the X pipe is really effective at increasing power.
The stock motor car seemed to run best with headers, no cats, X pipe and 3" exhaust pipes, no mufflers.
And a bonus, the sound was enough to scare the sh*t out of the guys I was running against.

[Greybeard ZR1]

Originally Posted by Bell Curve

Wish you had because it would be nice to see if it is worth the expense.

My guess is that it's minimal. Considering that the rotating weight savings gained by installing a lightweight flywheel is probably ten times the weight savings of all those underdrive pulleys.

Haibeck claims that a light flywheel gains about 15 "dynamic" horsepower, so even when you take the "underdrive" aspect into account I would be surprised if you gained as much as 3 or 4 h.p. with the pulleys.

But those little things add up. Witness all of Pete's efforts tweaking the stock block 350. All those small improvements add up to some *** kicking power, instead of just opening your wallet to buy a whole new bottom end with big bore, and a stroker crank.

That's why it would be great if Pete would put the car on a diet and tweak the suspension to get those 60ft. times down. A ten second stock block ZR1 would be phenominal.

[XfireZ51]

Originally Posted by Greybeard ZR1

...
And a bonus, the sound was enough to scare the sh*t out of the guys I was running against.