Dyno Results

Got the z dynoed today. pulled 299.2rwhp/313.6rwltlbs. overall was very happy. was hoping for near 300 to the wheels. what would this be about at the flywheel. it's a little better than the factory ratingof 305/335;) only power mod was a lm catback.

Here is the formula for A4:

RWHP / .85 = FWHP

299.2 / .85 = 352

Here is the formula for M6:

RWHP / .80= FWHP

299.2 / .80 = 374

Nice numbers

SteveC :)

Originally posted by SteveC
Here is the formula for A4:

RWHP / .85 = FWHP

299.2 / .85 = 352

Here is the formula for M6:

RWHP / .80 = FWHP

299.2 / .80 = 374

Nice numbers

SteveC :)

I think you're #'s are a little off. Manual trans (M6) doesn't eat up more power than the autos. I've always gone with 14% loss with M6 and 17% loss with A4. That would give you M6~348hp & A4~360hp at the crank/flywheel.

From what I understand, the beefed up and complex internals of the 4L60E added to the bigger torque converter drag the drivetrain loss to a total of 20-22%. The M6 is 15-18% depending on wear of the clutch assembly.

A4 (20% loss): 299.2/.80 = 374 fwhp

M6 (15% loss): 299.2/.85 = 352 fwhp

forgot to mention mine is a m6 so about 350 fwhp. well thats awesme. does this sound good, bad, or right on for a98 with only a catback...also after i geta new clutch what should iget... i was thinking a mti lid and then some hooker lt's...hows that sound. thanks guys and gals

Good numbers for the mods:)

My question is?
What difference does it make what the rear wheel numbers convert to in flywheel numbers?
You can't take the motor out and drive it down the road.:eek:
All that matters is how much it puts to the wheels and how quick it'll get down the track.
All of this debate over and over again about conversion factors. 14%, 15%, 18%, 20%, 22%, 25% who cares it doesn't correlate to anything in the real world.
299 horsepower to the pavement that's what counts.

It's nice to know how much power the engine alone makes though

:)

i agree that whats at the weels counts...but when i tell mot people that i dynoed at 299/314 they are like "oh i guess its not as fst as you thought" bs so then i haveto do the whole talk about rwhp to fwhp. i just wanted a simple way to tell the ignorant mass. thanks...do my hopefully soon modssound good...

I agree, flywheel horsepower #'s mean nothing since our our cars real power #'s go through the rearwheels. ;) But yeah, a lot of people have no clue what I'm talking about when I say my Z makes 325rwhp & 346rwtq. hehe! Oh well, they find out just how fast it really is as soon as I take them for a ride. :D

As for true drivetrain losses, well there really isn't a clear-cut answer. What people don't understand is that todays drivetrains are much more efficient than those of yesterday(i.e. a long time ago).

Our M6 is probably closer to 11-12% while the A4 is around 15% or so. ;)

Mike

Most "ignorant" people make ignorant statements, and I would not continue the conversation any further. Case in point, this guy was telling me his Cadallac STS was faster than my Camaro because it had 300 horsepower. I asked him if it was FWHP or RWHP, ofcourse he did not know. I then asked him about his RWTQ?, he did not know what I was talking about, so I told him he was right, his car was faster than mine, and drove off.

My 2001 Z28 A4 (lightly modded) - 291 RWHP, 350 RWTQ (3.73's).

Alot of people do not understand that it is NOT the horsepower, as much as the torque that takes you from "Farfegnugen" to "****enmovin :thumb: "

SteveC :)

You can't talk cars without talking to ignorant (or just plain stupid) people. It's part of the hobby, I guess.

i agree, converting is just bench racing....

looks about right for a auto car...You probably pulled somewhere around 290 stock

DAMN those LS1's are strong! 299 rwhp is awsome with only a LM..its looks like the LS1's where underated what 30-40hp?

Some of you amaze me at your quickness to denounce a flywheel conversion.

Since when do you hear of NHRA/IHRA telling the crowd and watchers on TV what the rwhp of their Pro Stock car is? Top Fuel Dragsters?

How about NASCAR. I haven't seen them yet strap one on to a dyno before the race to tell everyone what rwhp it made.

FWHP is just as impressive as RWHP. I make 555 FWHP. How many other people do you run into who can claim they have a street driven, grocery getting, family hauling 550+ hp car?

Yes, I think conversion numbers are just as effective and needed as dyno numbers.

Else, we could always pull our engines and throw them on an engine dyno so people don't have to worry about "numbers which are for bench racing" anyways:rolleyes:

so does anybody have insight on what i shoulddo next...i was thinking some sfc, lid, zo6 clutch and hydrolics, and hooker lts

i don't mind flywheel numbers, i just see conversion numbers as accurate as desktop dyno. only for bench racing. as for what the engine is putting out actual, that's only shown on an engine dyno.

Originally posted by Bone Maro
Some of you amaze me at your quickness to denounce a flywheel conversion.
I make 555 FWHP. How many other people do you run into who can claim they have a street driven, grocery getting, family hauling 550+ hp car?


Did you have your engine on an engine dyno? If not then your just guessing about the 555 at the crank. You don't know that for sure. That's what I denounce. "quoting" a number that is just a guess, a it shoulda, kinda, maybe if all else is equal. Like Joe Friday always used to say on Dragnet. Only the facts sir.
Nascar, NHRA, IHRA, and all of the others quote flywheel horsepower because they use engine dynos extensively and they KNOW what the flywheel numbers are.
I will NEVER post that I guess that according to this conversion number that my motor might be making around 350ish horsepower at the flywheel. I will post that it made 314 rwhp on a dynojet.
My 2 cents.

If you wanna get specific about accuracy, then your Dynojet numbers are inaccurate. The program uses a drum and some algorithims to guess on torque, then again guesses on horsepower. The only "true" dyno numbers, or at least more accurate, is a Mustang dyno because of the rotation of inertial mass against a known applied force. Thus, why Mustang dynos usually dyno lower than Dynojets and the like, they're a "true" chassis dyno.

So, I guess unless we're all pulling our engines and putting them on engine dynos, we're all screwed because no one knows the "true" power that we put out.

Or in my case, I tell people that know cars what my rwhp is. I tell other people who are just being nice or passing by at a car show what my fwhp is. That way, there's no confusion between the automotive masses and the regular masses.

But, this is stupid. If you don't like conversion numbers, then you don't. If you do, then you do. No one's right or wrong for converting if they feel the desire.

Originally posted by Bone Maro
Or in my case, I tell people that know cars what my rwhp is. I tell other people who are just being nice or passing by at a car show what my fwhp is. That way, there's no confusion between the automotive masses and the regular masses.

I do the same thing. If you are talking to some guy who has a 220 horsepower Maxima that's not really into cars, he only knows that his car has 220 horsepower. He more than likely has no idea (or cares) what his to the wheel horespower is. So when I tell him I make over 440 horsepower, he knows what's up... :D

Damn Sean, 76 posts?:D

Anyways. WS6Formula00 hangs out with the crowds I do and knows where I'm coming from. All in the eye of the beholder.

i don't tell someone hp to tell them what's up. i want them to think i have less. that's why i race, it makes my point.

how come everytime i post about...anything an arguemnt is started.:mad: i just wanted to see how my #'s were and istart some d@mn arguement. don't post on my tead unless your going to help or have a positive comment. i mus have some sorta curse:confused:

I did post the norm about what your power is to the flywheel, and the conversion factors the average owner uses.

Some people decided to hijack your thread becasue they feel your numbers don't count at the flywheel or you're "bench racing".

You asked, and some of us gave you the input you'd requested. Sorry if it got away from the original topic:cool:

they keep saying that our f-bodies are equivalent to the c5 of its perspective year. Chevy just downsizes the numbers so as to keep them from taking sales away from the vette. 299.2 is impressive for the mods you have done .

I hear you about the conversion numbers too. I live in NY and the new craze is all these lil rice burners. These kids think what the hell they have b/c they take a civic and put on an exhaust and an intake. It gets to the point where it gets annoying. Then they start with the my intake gives me 25 horse and my ehaust another 15 so now I have 150 hp. they have no idea and gets really tiresome tryin to explain what the real numbers mean.

It is fun to let them make noise in front of you and then just fly right by them though :cool:

but anyway good luck with the car and congrats on the numbers

Originally posted by 98 PURPLEHAZE
so does anybody have insight on what i shoulddo next...i was thinking some sfc, lid, zo6 clutch and hydrolics, and hooker lts

ok.. back to your subject..

SFC is good..
Lid is fine.. adds noise.. but power too..
hold off on clutch till you need one, then get the star spec 3 or something good like that..
hooker... hmmm everyone else has them.. why not...

its all a matter of what you want to do with your car and where you want to take it..

research before you buy!

good luck! sorry about your post going haywire! hehe

btw.. I am happy with my numbers.. when i one day get the mega bucks, I will for surely take my engine out and get it dynoed to have an idea of what the percentage loss is.. till then I dont care for speculation.. nice to know the engine power but only when you have had it on an engine dyno..