WKMCD

iTrader: (2)

Shawn @ VA Speed

iTrader: (3)

UPDATE:after a few more dyno pulls we did manage to raise the vacuum reading from .7 to 1.0 in. vacuum.and gained a couple hp but nothing to talk about.We are just fighting a losing battle with this intake restriction.Going to sawp out the cam and see what happens-probably nothing great due to the intake,but we have high hopes

WKMCD

iTrader: (2)

Dude, I thought you were better than that.

No problem, I'm sure it will drive out north of 550/520

(On the DJ)

6.0monsta

iTrader: (7)

Shawn,

What would an LS3 427 with a ported Fast92, TFS235s, 1 7/8 headers put out on your dyno?



Build looks fun.

Richard@WCCH

iTrader: (3)

Nice work to this point Shawn. I'm thankful you're taking the time to flog on Kevin's setup. Your findings are similar to what our LS7 customers are seeing. Steady pressure build up in the intake. This situation is very frustrating but with time and R&D can be worked around to a small degree. Kind of like a Cup style restrictor plate engine. Camshaft accordingly.

Kevin, the torque under the curve is going to be really impressive. In due time I'm sure better intake systems will become available. There's a big market for an intake that uses "outside the box" technology. Hang tight. It'll happen. Meanwhile enjoy your "gentleman's cruiser".

Richard

WKMCD

iTrader: (2)

Thanks Richard,

I didn't get to see the heads but Shawn tells me they are a thing of beauty. I expected nothing less coming out of WCCH. I think at the end of the day, I'm going to be extremely happy with this build.

Kevin

See5

iTrader: (53)

In the end you are seeing a "modest" ~6% increase in displacement. To significantly alter the engine's personality it will take a cam change.
Is that what you want?

WKMCD

iTrader: (2)

We're just making a modest cam change.

hymey

See5 remember these heads work better on the bigger bore and especially 427 so the power gains aren't just from displacement. Looking forward to the progress Kevin. Its good to see you posting up preliminary numbers and being realistic about the gains and mods being planned.

cheers

edcmat-l1

iTrader: (10)

At this point, we're thinking the cam may be part of the problem. It may be too small.

WKMCD

iTrader: (2)

Shawn says he consistently sees about 75hp difference between their engine and chassis dynos. That puts us a 530/515 now. Shawn said a few more pulls on Monday didn't show much improvement. A subtle cam change should net some more and Shawn firmly believes he can make 20-30 more on the engine dyno with the FAST - all of which should make it to the rear wheels. 550/520 on a great driver would be great. As I said, anything over that is a bonus. Nothing being done is at the expense of drivability. That remains the primary priority over peak numbers.

6.0monsta

iTrader: (7)

Did you engine dyno your 402 setup? Just curious for comparisons.

I was thinking it would take 650 to make 550whp? You have an auto or stick...stock gears?

WKMCD

iTrader: (2)

No engine dyno for the 403. All I can go on it what Shawn tells me he sees between the dynos and that's about 75hp on this size build. It will be on the DJ before it's done so we'll all see.

Shawn @ VA Speed

iTrader: (3)

the 75hp is for a z06 drivetrain.everything else is different.everything affects the rwhp-trans,converter,weight of the clutch,gear ratio,type of rear end etc.

6.0monsta

iTrader: (7)

That explains it. For 550 in a stalled/geared car I'd suspect you need 650 or so. My car seems to have a 17% loss since stock. The math comes out on my 416ci as well. I think the motor was around 600 because it put down 500whp.

Shawn @ VA Speed

iTrader: (3)

Joe,i would say your numbers are pretty close-i suspect that are goal on yours will be 650-or higher

Shawn @ VA Speed

iTrader: (3)

UPDATE:new cam in-that is all

WKMCD

iTrader: (2)

Pickup some gas on the way in tomorrow...

allngn_c5

iTrader: (3)

I guess we can expect some more dyno numbers tomorrow afternoon/evening ? Good luck on finding more power without having to sacrifice drivability ...... Thats should be everyones goal that doesn't track there car. Stock like drivability, but can get wild with a stab of the accelerator !! Good luck Kevin !!

veee8

iTrader: (40)

And your camera. , you know why Shawn.........
Awesome buildup Kevin!!! I love the methodical approach you have always taken in this thread.