Guesstimation of Worth

[stomis]

Remember the GN is in new era net ratings. 355 foot pounds of torque is respectable as was the 13.90s ETs.

😵

What do you mean net ratings? Net is at the wheels. Cars are NEVER advertised with wheel horsepower, ever.

 

[oldtinsmith]

Did a web search (net horsepower verses gross horsepower) looked at the E/How site!
Gross horsepower= Engine running with no peripheral systems (A/C, power steering, alternator, water pump, smog systems, headers without mufflers, etc).
Net horsepower= Engine running with all peripheral systems operating. Net horsepower rating was in effect until 2005. Insurance companies and safety advocates as well as emission standards caused the change to net ratings.
Wheel rating horsepower= Used by most after 2005 (horsepower at the rear wheels).

Doug

 

[pontiacgp]

hp ratings were always played with by the car companies and I don't think they can be relied on. They adjusted it to market the car in some cases and in other adjusted it lower to make the insurance companies happy...

 

[oldtinsmith]

hp ratings were always played with by the car companies and I don't think they can be relied on. They adjusted it to market the car in some cases and in other adjusted it lower to make the insurance companies happy...

That is so true! car manufactures "fudged" the ratings to not only get better insurance rates for buyers but to also slightly top a competitors rating.

Doug

 

[jrm81bu]

is that an open or a posi?.....the ones at the track of course has the pinion and side gears welded so that would shift most of the pressure onto the pinion shaft and axles, we were not permitted to run a spool..the main cause of the splines shredding is idiot who spun into the infield grass would hammer the gas getting back onto the tack and the one wheel hitting pavement would tear up the splines on the axle

Both, but mostly open rears. Having them welded may be able to shift the load onto something else though.

 

[jrm81bu]

What do you mean net ratings? Net is at the wheels. Cars are NEVER advertised with wheel horsepower, ever.

Net does not mean at the wheels.

Did a web search (net horsepower verses gross horsepower) looked at the E/How site!
Gross horsepower= Engine running with no peripheral systems (A/C, power steering, alternator, water pump, smog systems, headers without mufflers, etc).Agreed.
Net horsepower= Engine running with all peripheral systems operating. Net horsepower rating was in effect until 2005. Insurance companies and safety advocates as well as emission standards caused the change to net ratings.Mostly agreed.
Wheel rating horsepower= Used by most after 2005 (horsepower at the rear wheels). No, manufactures still do not use power measuered at the wheels. The newest form is measured at the engine but it must be set-up exactly the same way it will be in the vehicle.

Doug

 

[oldtinsmith]

jrm81bu,

You are absolutely right! I Was wrong stating "at the rear wheels", I should have said as the engine is when installed in the vehicle (as you correctly stated!) 😳 >

Doug

 

[stomis]

What do you mean net ratings? Net is at the wheels. Cars are NEVER advertised with wheel horsepower, ever.

Net does not mean at the wheels.

Did a web search (net horsepower verses gross horsepower) looked at the E/How site!
Gross horsepower= Engine running with no peripheral systems (A/C, power steering, alternator, water pump, smog systems, headers without mufflers, etc).Agreed.
Net horsepower= Engine running with all peripheral systems operating. Net horsepower rating was in effect until 2005. Insurance companies and safety advocates as well as emission standards caused the change to net ratings.Mostly agreed.
Wheel rating horsepower= Used by most after 2005 (horsepower at the rear wheels). No, manufactures still do not use power measuered at the wheels. The newest form is measured at the engine but it must be set-up exactly the same way it will be in the vehicle.

Doug

So Gross is flywheel with nothing but an alternator, IE a typical engine dyno.

Net is flywheel with AC, power steering, accessories etc

And wheel is wheel then?

 

[jrm81bu]

So Gross is flywheel with nothing but an alternator, IE a typical engine dyno. I don't think it is even with an alternator. It may even be with an electric water pump. This one will give you the highest numbers.

Net is flywheel with AC, power steering, accessories etc Pretty much.

And wheel is wheel then? Yep.

And then the latest rating is called something like SAE Net, which is exactly how it will be in the car, but still measured at the flywheel, for the most part this will give you the lowest numbers.
I don't like quoting magazines but in one of them recently they were discussing the Z06 Corvette, with it's SAE Net rating of 505 was more like 540-5 if it was just net.
Then, just my guess only to get some perspective, the gross rating for it would probably be over 600hp.