Redline-Motorsports

iTrader: (3)

We'll I finally got 500 miles on the Z which qualified it as broken in!

Baselined the car this last week and it made 457.1 RWHP and 436 RWFT!! The A/F ratio was 11.5:1 across the boards!

GM has really underated these motors and puts this thing close to 535 at the flywheel based upon a 15% drivetrain loss. I am trying to get to the track and and see what we can squeak out of it on stock tires. The Kooks LT headers just showed up the day after the baseline so that will be the first mod followed by some tuning.

Thanks GM!

Big-DEN

My guess, is kooks + tuning bring you very near to the 490rwhp mark and close to 470rwtq.

Lets say 475-495rwhp and 460-475rwtq with kooks and tuning.

firefighter

I wish I had one.......

Redline-Motorsports

iTrader: (3)

I say 490-500 and torque in the 480's.......

Wesmanw02

iTrader: (4)

Nice numbers man.

The LS7 is an awesome engine

Ojustracing

iTrader: (4)

Howie great to see some good numbers. Now get that thing to the road course. There was 3 c-6 z0-6 at Lime Rock a few weekends ago. Will talk once I get back from the Cannonball One Lap Of America.

John O

Redline-Motorsports

iTrader: (3)

hey john!

Going to Watkins Glen next month for two days! Harness bar and belts are on there way. Have fun at the Cannonball! Say high to blondes in the Lambo!

2xLS1

iTrader: (25)

By your sig, I'm guessing it was on a Dyno Dynamics dyno. Those numbers are almost exactly what I saw on a Dynojet (SAE). See my post here.
https://ls1tech.com/forums/dynamometer-results-comparisons/475141-z06-ls7-before-after-headers.html
Curious if you did any logging while it was on the dyno?

slt200mph

iTrader: (42)

I have had a number of cutomers put their cars on the dyno. They are all making 455-465 RWHP. So your numbers are where they are supposed to be. Hot Rod Magazine did a engine dyno pull on a LS7 crate motor a couple of months ago. Using the stock exhaust manifold without cats or mufflers. they made 546 HP. They figured adrop of 22HP if you used the cats and mufflers. That puts the motor at 524 HP. GM as they always do under rates their engines out put. I would guess that a real HP number at the crank on these engines would fall into the 520-530 HP range. Enjoy your car. You might want to try using some better tires than the sorry run flats that come on the car. You will notice a big improvment in handling and ride if you do...

brad8266

iTrader: (23)

ChucksZ06

iTrader: (9)

When my order comes up with you I will be putting some pilots on mine...blue or black...I have not decieded yet...only thing good about being older is that it is easier to wait for things than when I was 20.

01bird58

iTrader: (9)

truly unbelievable, cant wait for the day when I can get my own

smokey1226

ill second that

blackbird95

GM has always done that. If you remember back in the 60's with the 1967 L-88 Corvette, that was a 427 rated at only 425 HP. But they also had an option of a 427 435 HP. If you pay close attention the L-88 put out a lot more power than 425 HP. They aren't lying, all they did was bump down the rpm instead of the L-88 rating (and this is estimate) 500 HP @5600 RPM they moved it to 425 HP @4800 RPM.

J-Rod

Good numbers. Keep an eye on IAT as that is what kills dyno numbers. YOu can loose 20+RWHP from the loss of timing, from just midly higher IATs. That is what tuning resolves.

No one ever got fired or sued for underating numbers. But Ford got sued for over rating the Cobras if you'll remeber. GM wants to ensure tha tthe worst motor will make 505. Those that come out slighly ahead, are just icing on the cake for the owners.

Also you'll find the loss in the driveline to not be a percentage, but rather a fixed loss. On a C5 its about 50-55HP going from a Superflow to a Dynojet. On the C6Z06 I don't know as there is more mass in the rearend.

Z O SICK

iTrader: (1)

Nice numbers for bone stock!

Tech

iTrader: (1)

You should tune it and put it back on the rollers. THEN, put the headers on and tune it again.

Stang's Bane

iTrader: (22)

L-88's were rated at 430hp @5600 rpm. The actual output was actually closer to 560-580 @6400 rpm. It was said then you could put mufflers on theem and it would blow the cores out in just 2 weeks. L-88 was in the same tune as a ZL-1 just with an iron block.

UnZFeat'd

iTrader: (1)

which year cobras were overrated? when was this?

jRaskell

iTrader: (1)

The 99 Cobras were underpowered, dynoing similar hp as the GTs (with a bit more torque though). There was a Ford recall to remedy the problem, and it was the primary, if not only reason there was no 2000 Cobra (with the exception of the special production Cobra R, which was really a completely different model, stripped down and prepped for racing duty)