flywheel to wheels on a 2wd saph

 

WELL over 100bhp


You didnt mention anything about your car, so I used Rod Tarry's as an example.


It varies from car to car mate!

 

Im a transmission loss sceptic, cant see it being over 100bhp even on a car of rods power.

Fuck flywheel power anyhow, absolutley no relevance to how the car is on the road.

 

oo ok mate..

well its 2wd..stage 3..t34.48..500 inter cooler..

i had it dyno'd last week..

the dyno sheet says 185.7 killowats which is 250bhp..

and it 367 lbs of torque..

and thats not at full potentiol as it was leaning out..

so basically i was just curious to know if that 250 would be around 330 at the flywheel..if that makes sense

 

Actually I kind of agree with you, based on the "energy cannot be created or destroyed" it means anything going into the box that doesnt come out has to be used up as either heat, noise or destroying the surface of the cogs in the box, and it does seem hard to see an entire 100bhp+ going that way, but none the less that is what happens it would appear.

 

The most you ever hear anyone claim losses at for 2wd is normally 20%, and even that seems high, so I really dont think you have lost 80bhp (almost 25%) out of 330bhp


I dont see how it can be that much torque when its so down on power though, thats a BIG figure for at the wheels, far more than normal for a stage 3!

Have you got the whole plot you can stick up????

 

Lovely topic... and this is what i am writing about for Fast Ford this month.

Ive personally witnessed figures of 35% quoted as transmission losses for a 4wd cossie from one "Specialist" in this country.

 

I have allways x the figure at the rear wheel by 1.34 to get a estimate at the flywheel eg 250x1.34=335 on your case

 

yes mate..

here it is..

it says 185.7 KW which is - 249.03 bhp

499.7 NW which is- 368.55 lbs



as you can see it starts to lean out so it wasnt run to its full potentiol..





i thought that torqur figure seemed very high..thats one reason iv posted this thread

 

Mine gave a flywheel figure of 371.7bhp and a @ wheels figure of 315bhp

This was on a Dyno Dynamics RR.

So i had just under a 57bhp transmission loss.

Steve.

 

perfect timing then stu lol

 

That would give mine a Flywheel figure of 422.1 bhp

Don't think so

Steve.

 

I dont see anywhere on that power graph it could possibly be making 369lfbt of torque, the maths just doenst work!

 

Its all bollocks, you see most the GTR lot quoting 150bhp+ tranny losses and shit.

In Oz, USA, anywhere worth a shit, they ONLY quote wheels, you go quoting flywheel and you will get laughed at.

We should stop all this flywheel bollocks in the UK too IMO.

Wheel power is for driving, flywheel power is for trying to show off when you cant prove it on the road.

 

it says 499.7 NW @ 118 KPH

not sure mate but thats what the graph shows

 

Thats means its at 4200rpm.


But 369lbft @ 4200 rpm = 295bhp



So it CANT be right, its just not possible

 

having a derived engine speed probably doesn't help

 

Personally I would never trust any rolling road operative called "troy" I think thats the real problem here

Seriously though, those graphs and numbers are blatantly less accurate than if you used an etch a sketch

 

lol the actual operative was lee..

im not sure whats happening with the graph then

 

so the problem of global warming is not from the exhaust gases, its from the heat from the drivetrain LOL

 

but than again i remember lee saying when i asked him what it was in bhp..he said around 300.. im well confused now

 

What boost are you running m8 ?

 

I think Lee/Troy/Mrs Bishop (madge to her friends) is most probably smacked off his tits, and confused your rolling road session with a bingo hall, shouting out any numbers he could remember.

 

pmsl

 

erm 23psi mate

 

dam the car its pissing me off

 

It would if you get of your ass and get that 38 fitted Steve..

 

As long as you're happy with the power m8.

 

Hello from New Zealand chaps.

I also have a so called high HP figure for my run of the mill Stage 3, 2WD Sapphire down here.
It definately seems alot higher than some of the similar speced U.K Sapphires which is odd.
I've got a T34 .48 , Greens and a chip from NMS plus all the other stage 3 bits
Anyhow have a look at my Dyno chart and let me know what you make of it
ps. Ignore the Torque in the graph.

Cheers,

Ollie.

For those of you with poor eye sight it basically says , 300 HP at the wheel (225kw) at 26 psi boost.

 

i would be if it made sense..i drove it home and it clocked 10psi as the dump valve was relasing boost ..and it couldnt be run to full potentiol as it was leaning out bad.but by next tune it should be fine as iv replaced the filter..had a new pump and re wiring the fuel pump..

and iv got a spring for the d/v to cope with 25-30psi

 

i would of thougt 300 at atw was resonable as my dads 500 is 343 at the flywheel but just over 300 at the wheels

 

Agree Kev, i always go on how it drives on the road/track etc imo, numbers are numbers and sounds to me that they're wrong half the time anyway..

 

havent had chance to drive it full out yet as the d/v wet so was loosing boost..

 

You don't seem to be having much luck yet fella..

 

when the car was stage 1 ran spot on..

since i decided stage 3..

nothing but headaches

but than i think when its done it will be worth it

well i hope

 

Ditch the dump valve m8.

 

was thinking about it..in 2 minds atm..

also iv got closed loop..that wouldnt affect anything would it

 

I run closed loop with no dump valve m8 .

 

no mate im on about will closed loop afect the graph and power output in anyway..

shouldnt do..but just making sure

 

It could effect the power output if there was a problem with it (although it should be active at all at WOT on boost) but it wont make the machine the graph is from talk absolute bollocks like it has on your run.