LASTLS1

iTrader: (7)

We'll know pretty soon. I think it can be done. My power was made with a smaller cam than yours! My cam was all done at 6500 rpm.

black_z

iTrader: (4)

On Lou's Dyno......

Phil99vette

iTrader: (11)

T T T

The Juggernaut

iTrader: (7)

Nono, your cam is alot bigger than mine.

Quickin

Already done.
And if you want 700 RWHP on motor, they will upgrade it to do so.

http://www.moreperformanceinc.com/ls6_427_race.php

LASTLS1

iTrader: (7)

The 700 they adv. is flywheel hp?

JakeFusion

iTrader: (7)

Well, I don't know if you've seen this thread on Corvette Forum http://forums.corvetteforum.com/showthread.php?t=955037

But the Vette Doctors put together a C5R that put down 663 RWHP and 535 RWTQ (SAE corrected) with a 12.6 AFR and through a M6 and 4.10 gears. If you back off the compression some with a setup like that, you might be able to get 600-620. Even the graph shows 400rwtq at 3k... it pulls all the way to about 7900

So, maybe with high compression AFR 225s and radical hydraulic cam, with 1-7/8" headers and FAST 90, I think you can approach 600rwhp. Especially if you do 455cid...

11 Bravo

iTrader: (3)

The 725 hp 427 is at the flywheel. But they have some killer 427's for, gulp, $28,000:

http://www.moreperformanceinc.com/cu...dy_98-03_1.php

FEAR THE LS1

iTrader: (1)

Ouch! My 408 is about 730 FWHP and it cost less than 1/2 of that 427.

Getting back to the topic, 625+ RWHP out of a LS1 isn't too hard, of course that is with a 6 speed. To achieve 625 with an automatic NA is a horse of another color.

Here's some specs on my motor:
Stock 6.0L iron block + Callies Crank = 408 ci
Eagle Rods
Diamon 14.5 CR Pistons
BIG FMS Cam has over .790+ lift
A set of badass FMS LS6 Heads with 2.08/ 1.60 valves
An awesome valve train
Using a LSX 90mm intake and TB
Kooks Headers 1-7/8" to 2" Stepped, 3-1/2" collector

Very simple little motor. I have a TH400 with a loose unlocked converter, Steel drive shaft, 12 bolt with 4.56 gears and 30" slicks...not the most dyno# friendly drivetrain the car put down 577 RWHP. Put my motor in a 6 speed car and your in the 625+ range.

Now if you went more CID you could achieve the same number with less compression and a little smaller cam. I'm a nut and wanted to see what the stock 6.0 block could do...needless to say I'm impressed.

Lee

Beast96Z

iTrader: (21)

FWIW, comps XE-R lobes stop at 248 degrees. I tried to get a bigger lobe on a XE-R and they would not grind it. I'd call Cam Motion, but better yet, let Futral do it all.

Quickin

He asked for a 625 RWHP motor. The existing 725 FWHP 427 that MORE sells will give him that. For a little extra cash they will build that motor to put down 700 RWHP.

VINCE

iTrader: (1)

People confuse advertising with actual fact. I personally think it is going to take a lot of compression and a HUGE cam to make that kind of power out of a 42x motor. I dont care what anyone said they have done or what #'s they claim. There is always more to the story. Unless YOU personally put that motor together and had EVERYTHING spec'd out and not told to you. You have no clue what is under the hood. A friend of mine has a ZR1 and his old motor put out 605rwhp NA. It was a 415ci motor with over 13 to 1 compression. I would like to think the LT5 is a pretty stout motor compared to our LS1 based engines.

My thoughts are you will need over 12.5:1 compression, HUGE cam, and 340 plus flowing heads. Tuning will have to be dead on and you will NOT accomplish this on pump gas.

If anyone says they can build a NA motor to put out 600rwhp plus with less than 12.5:1 compression on pump gas I think if they are so confident they should allow the engine to be inspected by an independent vendor. I sat down and played with flow #'s one boring night and that would take some serious CFM and not just to .600 lift. I am talking about flowing to .800 lift to get the full potential of that power. Now with compression and a HUGE SR cam you could do accomplish this easily.

Now all of this IMO and I have much respect and admiration for all the vendors and all of their hard work, but they will tell you as well 600rwhp plus NA on pump gas is not going to be easy.

racer7088

Putting out 625 RWHP is a major feat with pump gas! I know what it takes to make 680 RWHP with race gas and 625 RWHP on pump gas at low compression is not gonna happen soon unless it's BIG C5R stuff. I think we aren't far off making 600 RWHP with regular LSx parts if we could do our big stuff witha SOLID roller but we've made around 565 RWHP with a hydraulic roller so far with a 434 and the FAST 90mm intake and there's more there. It takes very good heads and a very good shortblock and a very good intake and headers combo to get up there and some rpm too!

We've had cars so far that suposedly put out over 450 make 400 on our dyno and some others that supposedly made over 500 make again WAY less so I do not believe some of the numbers I've heard. The 680 RWHP car goes 145 MPH in the 1/4 at 3200 pounds so that is real! With the C5R block and a dry sump I think you might hit 625 at the wheels with pump gas but thats a lot of money.

racer7088

Phil,

That's a very good start and then you'd need some serious heads and a pretty big cam to feed that thing up higher. At 1.3 FT LBS or TQ per inch which is good for BIG motor on pump gas you could see 565 FT LBS of TQ peak from say our 434. At peak power with like an LSX manifold you would probably be around 88% of peak TQ or 495 FT LBS of TQ. If you could make that at 7000 RPM you'd have 660 FWHP and probably around 600 RWHP. If you could hold onto that TQ to 7250 and shift at say 7700 you could probably make 685 FWHP and right on 625 RWHP at least in STD corrected form and maybe a little less in SAE form so you can at least see where you are at.

Now with a dedicated sheet metal you could probably make more TQ up top and hit your HP number but there's another 2500.00 dollars and maybe another hood! It's certainly possible but that would be an accomplishment and you'd need heads that went 350 CFM or so and were good heads along with one big *** hydro-roller with GREAT valve springs or a solid roller most probably.

Futral

iTrader: (1)

Phil,like everybody is saying 600+ rwhp on pump gas is going to be hard. It CAN be done,just has to have killer parts matching and good tuning. Just to give you an example of a few motors I have done.

1. 434ci street solid setup:
-12.5 CR
-our LS6 heads 2.055"\1.60" 238cc volume 320 in\241 ex CFM(radius and no pipe)
-255\264-112 .680" low lash solid.
-Darton wet sleeve block 4.155" bore
-1-7\8" headers with our 3" y-pipe out cutout
-FAST 90mm setup-85mm MAF
-12 bolt w\4.10 gears
-M6 with steel flywheel
-17" wheels with DR's

Dynoed 605\54x SAE on a 50% 93\103 gas mix. Made peak power at 6600 RPM. The cam was NO major advantage,prob actually worse than a hyd,just because it was equal to a 253\261 hyd cam and LESS aggresive. Only reason for running this cam was drivabilty.

2. Vince's C5 408 street setup:
-11.75 CR
-our 6.0l heads 2.055"\1.60" 230cc volume 309 in\238 ex CFM(radius and no pipe)
-6.0l block
-250\257-113 hyd cam-kinda for nitrous
-Kooks 1-7\8" headers out cutouts
-FAST 90mm setup-STOCK MAF
-M6 w\3.42 gears
-heavy ZO6 spin-offs

Dynoed 555\520 and has very good street maners--Vince can comment anything else. I feel that Vince's setup with 12.5 CR,LS6\AFR heads and a little bigger cam can do 580+ RWHP!

3. Gordon's RACE 418 ci:
-14.0 CR
-our LS6 heads 2.055"\1.60" 325 CFM
-big race solid cam
-LS6 intake and ported stock T\B
-12 bolts w\4.30's

Dynoed 612 rwhp at 7300 RPM, Would be like 632 rwhp with the FAST setup.

4. Lee's car of course!

5. Then my little ole 348 550 rwhp but that's different.

VINCE

iTrader: (1)

Yes my car has awesome street manners. I get 24mpg on the highway and NOW with my Z06 Ti exhaust the car sounds like a mild H/C or FMS-9 cam only car. I put down 525rwhp locally thru the Z06 exhaust with 26 degree's of timing. Testing out the nitrous last week on a small shot I put down 642rwhp/796rwtq spraying at 3500rpm and that was rolling into it.

jyeager

You don't mention if you have cost constraints, or if you are willing to use nitrous or pressure to achieve that number...
So far all the comments are assuming NA, but with a power adder it's not a challenge and it would be half the price.

mikey

iTrader: (6)

Phil, are you going to be doing this yourself? Your goal is achievable but like Allan said, it will be tough. We did a pump gas 346 that did 502 rwhp through full exhaust and belts. Independant dyno too. But this is a nasty motor to drive every day.

There are some recent developments in the LS1 world that will make this a little easier to achieve but not cheap.

VINCE

iTrader: (1)

Like Mikey said.. With enough money you can accomplish anything.

777

iTrader: (21)

Well i doubt anything