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The Moparts online calculator matches up pretty closely to the engine dyno HP I got from PRH's dyno, even though it, just like the Moroso tool, is said to calculate RWHP.

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Whats this Moparts calculator of which you speak?

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The Moparts online calculator matches up pretty closely to the engine dyno HP I got from PRH's dyno, even though it, just like the Moroso tool, is said to calculate RWHP.

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Whats this Moparts calculator of which you speak?

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http://www.moparts.org/Tech/tech/index.html
734 rwhp for me
134mph/3900lbs

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Interesting. The Moparts online calculator says it's RWHP. I think it still looks a bit optimistic, but I haven't been on a dyno with this configuration to have anything to compare it to.

128 mph @ 4195# = 686rwhp?

What kind of actual flywheel hp number should this speed/weight combo be rated at?

(46RE trans thru 9.25" locker w/3.92s)

The theoretical "breaking point" for the Magnum 360 block is supposed to be 500 "flywheel" hp? All of this info doesn't jive.

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From the online calculator at IROC-Z.com you should be at 687 rwhp and 824 fwhp your way over the safe limit HA HA!!

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1968 Pontiac GTO NHRA F/S (stick car).
400 Pontiac, Q-jet, .420 lift hyd cam, stock intake, stock heads.
3620 race weight.

470hp on the SF-901 engine dyno.
410hp on the Dyno-Jet chassis dyno.

set the record with that combo 10/2005......10.97 and like 122mph.

same motor in a 68 Firebird, same weight, same class.....set the record again last year, 10.79 @ 123.

shows around 500hp on the Moroso calc.

who really thinks that motor combo will make 500 "RWHP" ?

just had a customer try out a new motor in his car last week.
2700lbs, ran 8.53 @ 163......made 766RWHP.
i think it shows like 850+ on the Moroso calc.

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i rest my case.
i didn't mean to offend anyone on purpose, i'm just trying to prove a point. if anyone feels better about their combo because some slide rule says it makes tons more power than it actually does, well, i guess that's their right. it just makes guys like me feel better (and look better) when our 600 HP combo stomps the supposed slide rule 700 HP combo.

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That Moparts calculator says my car is 3 tenths too fast lol..

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I think that is a sign of a well sorted chassis.
Dwayne's super stocker is another good example where the car "seems" to run better than it should. In a street car the ET numbers you see with the moroso calculator seem overly optimistic in an unsorted chassis. It's all about how well the chassis applies the power to the track.

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I have engine dynoed my motor and chassis dynoed at rear wheels,at the crank it made 832 hp , at the rear wheels it made 652hp.The car weighs 3,600 lbs with me in it.It ran 9.63 at 138.8 mph.I run the car on pump gas 93 octane only and it was dynoed both at the crank and rear wheels with 93 octane.According to moroso speed calculator the hp should be 738 hp.This is almost smack in the middle of both readings ,go figure.I too have been trying to figure out for a long time if the moroso speed calculator is at the crank or rear wheel hp.I guess its another good tuning tool in the quest for faster times and mph.

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I have called Moroso on this several times and they
say its RWHP every time

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I heard from other people its NET!

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I've studied and compared some engine dyno, "Power Calculator" and RWHP numbers on a few combinations and have come to this conclusion: All three are different, but correlate well (i.e. engine dyno highest, RWHP lowest, and Speed Calculator in the middle)

The engine dyno is gross corrected flywheel HP.

The Moroso Calculator is actual net flywheel HP. and,

Chassis dyno is corrected RWHP.

If you run your car when the DA is 0, have no accessories running off the engine and same engine dyno exhaust system, The Morroso HP will match closely the engine dyno results (assuming it's not happy).

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this makes sense to me

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I have called Moroso on this several times and they
say its RWHP every time

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I heard from other people its NET!

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I've come to the conclusion that its fly wheel HP,
I had my car on a chassis dyno and it showed 565 hp
at the tire (but I really dont believe a chassis dyno
with a loose conv)... by rights the pulls should
have had reasonable numbers from 6000 to 8200