BHP Competion

[jamest5r]

My car is going to be custom mapped on HLM's rollers on tuesday, i have no idea what it going to make(all rollers are subjective and can give different results i know), but a little competion for you all..... figure's at the flywheel and wheels please, will give a prize just cant think of one at the moment!!

Spec can be seen in "project manual" thread.

Cheers

Jim

[irf]

330@ wheels

340@flywheel

[jamest5r]

Originally Posted by irf

330@ wheels

340@flywheel

10 bhp difference between fly and wheel,?? got to be 20 to 30%??

[volvokid]

Originally Posted by jamest5r

10 bhp difference between fly and wheel,?? got to be 20 to 30%??

Thats what I thought, could IRF be taking the piss out of a certain rolling road?????

[jamest5r]

Originally Posted by volvokid

Thats what I thought, could IRF be taking the piss out of a certain rolling road?????

Don't want to get into the politics of r/r and tuners, that's why i said all r/r are subjective, just a bit of fun, as long as im happy with how my car runs( i don't give a **** about the figures) i will be happy.

[volvokid]

Originally Posted by jamest5r

Don't want to get into the politics of r/r and tuners, that's why i said all r/r are subjective, just a bit of fun, as long as im happy with how my car runs( i don't give a **** about the figures) i will be happy.

I'm with you there james, just enjoy what you have.

[t5 pete]

290bhp 270whp

[jamest5r]

Originally Posted by t5 pete

290bhp 270whp

Would be happy with that and under 14.5 on the 1/4 mile,it's all about how it drives lol (thread back on track cheers)

[t5 pete]

i would definatly think the 16t with the surporting mods you have done should easily make them numbers

[smithness]

dont know wot my bhp is fitted some new bits ?

[t5_monkey]

230bhp at the wheels at 6000rpm
276lb/ft torque at the wheels from 2000rpm

99.8mph and 15.003 on the 1/4 mile (fluffed the start - 1st attempt at a 1/4)


Don't even go there with 'at the flywheel' (see the whole saga on the BSR thread in the mods section) saw a guy on a Seat Forum who had:

260bhp at the crank (23bhp loss to the wheels) stock

then the company chipped his car and immediately dynoed it again...

305bhp at the crank (43bhp loss at the wheels!)

How the **** does a gearbox suddenly suffer an extra 20bhp loss? he sounded happy on his post not realised the company had 'persuaded him' he had gained 20bhp more than he really had!

From all the reading I've done I've never really seen a chip alone on a regular turbo car give much more than 10% power gain at the wheels.

Most day to day driving is done at lower revs anyway - had a guy try and race me out of a 30 limit after overtaking me in the limit and slowing right down to 20 right in front of me - caught in third due to missing the deristriction sign at under 2000 rpm and reeled him easy by riding the torque. (was a hyundia coupe 2litre or 2.7) that's satisfying driving!

[cameron]

257bhp not sure wether thats fly or wheel tbh.

15.02 for 1/4 mile

Hopefully into the 14's next time.

[turbo-tuner]

Originally Posted by t5_monkey

Don't even go there with 'at the flywheel' (see the whole saga on the BSR thread in the mods section) saw a guy on a Seat Forum who had:

260bhp at the crank (23bhp loss to the wheels) stock

then the company chipped his car and immediately dynoed it again...

305bhp at the crank (43bhp loss at the wheels!)

How the **** does a gearbox suddenly suffer an extra 20bhp loss? he sounded happy on his post not realised the company had 'persuaded him' he had gained 20bhp more than he really had!

That depends on where the peak power is on the graph. The higher the rpm in the gear you are testing in, the greater the drag loss in the tyres, transmission etc. For example, it's quite possible that the 260 hp was at 5500 rpm and the 305 hp was at 6500 rpm. This would give the 305 hp run a higher drag loss at peak power than the 260 hp run. This could therefore be a perfectly genuine result. The actual losses vary from dyno to dyno, but what is common to all dynos is that the higher the rpm in the gear you are testing in, the greater the drag loss. Since drag loss is exponential, this effect is more pronounced the further up you go in the rev range.

[smithy]

i would say 265 to 275 whp that would be around 300 bhp fly but remember with the m59 box and r clutch your car should be pretty dam fast because its all about the power on the road that counts. and james you will batter your time on the strip in your car as they say its all about the driver not just the car and i know you can drive mate

[hamish]

Originally Posted by smithy

i would say 265 to 275 whp that would be around 300 bhp fly but remember with the m59 box and r clutch your car should be pretty dam fast because its all about the power on the road that counts. and james you will batter your time on the strip in your car as they say its all about the driver not just the car and i know you can drive mate

He's OK upto 56mph after that his nose starts to bleed!

[t5_monkey]

Originally Posted by turbo-tuner

That depends on where the peak power is on the graph. The higher the rpm in the gear you are testing in, the greater the drag loss in the tyres, transmission etc. For example, it's quite possible that the 260 hp was at 5500 rpm and the 305 hp was at 6500 rpm. This would give the 305 hp run a higher drag loss at peak power than the 260 hp run. This could therefore be a perfectly genuine result. The actual losses vary from dyno to dyno, but what is common to all dynos is that the higher the rpm in the gear you are testing in, the greater the drag loss. Since drag loss is exponential, this effect is more pronounced the further up you go in the rev range.

That's Cool, and may account for the diff - but I'm almost certain it was pretty much the same rpm for both peak power readouts

[smithy]

Originally Posted by hamish

He's OK upto 56mph after that his nose starts to bleed!

how true you are hamish lol