How do you get to 750rwhp?
Re: How do you get to 750rwhp? I don't think $20K is enuff to build a 750rwhp motor, much less a C5R one. Figure $6K for the block, $2K for the crank, the heads can run like 10K all done up right? I think you need $30K.
Col, I'm not sure what BeaSSt and Mikey do on a chassis dyno.
Col, I'm not sure what BeaSSt and Mikey do on a chassis dyno.
TECH Fanatic
Joined: Dec 2001
Posts: 1,451
Likes: 0
From: Atlanta
Re: How do you get to 750rwhp? With heads, cam, jessel rocker system, pistons, rods, crank, intake, LS1 edit, tuning, bigger fuel rails, labor etc. figure on $30K. Then add on new clutch, drive shaft and rear end.
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Re: How do you get to 750rwhp? I only wish 750 RWHP could be done for $30K.
I'm telling you folks from experience, $30K will not get you 750 or even 650 RWHP NA with a Gen III engine after parts and labor...and that's not even counting the drivetrain upgrades that are needed.
I'm telling you folks from experience, $30K will not get you 750 or even 650 RWHP NA with a Gen III engine after parts and labor...and that's not even counting the drivetrain upgrades that are needed.
TECH Veteran
Joined: Aug 2002
Posts: 4,055
Likes: 1
From: Hartsdale, NY
Re: How do you get to 750rwhp? Yeh. ...The More Performance 427 engine looks like more of a race piece than street motor to me too...
The graph on this one is weird - Peak FWHP is 725 at 7,500rpm while torque is only 510....
...So if this motor is 725HP at the flywheel, what do you estimate it would make at the wheels? 725FWHP x .85 = 615RWHP????
The graph on this one is weird - Peak FWHP is 725 at 7,500rpm while torque is only 510....
...So if this motor is 725HP at the flywheel, what do you estimate it would make at the wheels? 725FWHP x .85 = 615RWHP????
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Re: How do you get to 750rwhp? It's kinda hard to determine RWHP based on trap speed, IMO. I ran 137 MPH with only ~510-520 RWHP. With 600 RWHP it would probably have been about 144.
Robert, I won't claim that I know exactly how to determine RWHP from FWHP but it would make sense to me that the faster you're spinning the weight the more power will be lost to inertia and friction.
I would think an 8000 RPM engine making 725 at the flywheel would be about 580-590 RWHP through an automatic. Some people might not agree that that much power would be lost but the inertial loses involved in accelerating a drivetrain that quickly are great, IMO.
Robert, I won't claim that I know exactly how to determine RWHP from FWHP but it would make sense to me that the faster you're spinning the weight the more power will be lost to inertia and friction.
I would think an 8000 RPM engine making 725 at the flywheel would be about 580-590 RWHP through an automatic. Some people might not agree that that much power would be lost but the inertial loses involved in accelerating a drivetrain that quickly are great, IMO.
Re: How do you get to 750rwhp? Well the 8.99 line I put on there was discussed with a friend of mine who runs 8.90's in a FI 3.6 SBF. If for example you had a 3300 raceweight, and did 800rwhp you could go 8.80/8.90's, with a 20% loss that's 1000 hp at the crank.
Re: How do you get to 750rwhp?
9.70 @139 @ mph, 3200 raceweight, = 580- 600rwhp
Suzuki Hayabusa, $10,000
Sounds like a bargin to me!
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
11 Second Club
Joined: Nov 2001
Posts: 1,645
Likes: 0
From: Hanover MD
Re: How do you get to 750rwhp? my buddy had kenny dutweiler build his 4.5l turbo 6 for his gn that made 950flhp for around 25k with the fast unit.
he drives it alot and its very drivable on the street.
he drives it alot and its very drivable on the street.
The Bull
Joined: Jun 2002
Posts: 3,578
Likes: 2
From: Grand Rapids, MI
Re: How do you get to 750rwhp? Colonel, ARE posted a while back that the silver Z made something like 650 (close to) NA on a dynojet. (EDIT: I went back and checked, it was 589 approaching 600 in May, read on for the rest of the story). I thought that Madman also said that Pain's motor was in the 600 club as well (non Dynojet).
Queso, I can tell you from some very brutal experience that you are not going to have nearly enough money to get there. Especially if you are not going to upgrade the transmission or rear end. You might as well add those to your list right now. If you plan on never racing it at the track your parts will survive a little longer. It's inevitable that they are going to break, again and again.
You could buy the ARE motor from the Z, it's pretty close to your budget. I'm sure they would even convert it over to a NA setup and you would do well. Not going to say it will be very streetable yet even street legal though.
Don't forget all the little **** it will take though. Ever take a look at the cost of a big fuel pump and some Aeroquip fittings for the fuel system that you'll have to run?
If I were to spend the money on a true street car I definitely would consider a forged bottom end 346 with a forced induction setup. You can get to your numbers easier. Your neighbors won't hate you when you fire the car up at all hours of the night. And it can be done well within your price range.
Queso, I can tell you from some very brutal experience that you are not going to have nearly enough money to get there. Especially if you are not going to upgrade the transmission or rear end. You might as well add those to your list right now. If you plan on never racing it at the track your parts will survive a little longer. It's inevitable that they are going to break, again and again.
You could buy the ARE motor from the Z, it's pretty close to your budget. I'm sure they would even convert it over to a NA setup and you would do well. Not going to say it will be very streetable yet even street legal though.
Don't forget all the little **** it will take though. Ever take a look at the cost of a big fuel pump and some Aeroquip fittings for the fuel system that you'll have to run?
If I were to spend the money on a true street car I definitely would consider a forged bottom end 346 with a forced induction setup. You can get to your numbers easier. Your neighbors won't hate you when you fire the car up at all hours of the night. And it can be done well within your price range.
Re: How do you get to 750rwhp? Merlin is the easy answer. Just forget the gen 3 and go big block. You can get mega cubes that will idle nice and scare the snot out of everyone on the block for alot less money than building an LS1.
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Re: How do you get to 750rwhp? "ARE posted a while back that the silver Z made something like 650 (close to) NA on a dynojet."
Could you see if you can find that post for me? Thanks.
Like you said, Larry's car was not dynoed on a Dynojet. I'm NOT saying that it won't put down 600 RWHP on a dynojet. I don't know, but I kinda doubt it.
Could you see if you can find that post for me? Thanks.
Like you said, Larry's car was not dynoed on a Dynojet. I'm NOT saying that it won't put down 600 RWHP on a dynojet. I don't know, but I kinda doubt it.
The Bull
Joined: Jun 2002
Posts: 3,578
Likes: 2
From: Grand Rapids, MI
Re: How do you get to 750rwhp? "ARE posted a while back that the silver Z made something like 650 (close to) NA on a dynojet."
The original post
