How much power ?
Discussion
v8nrg said:
Yes, yes I know I’ve knocked over that can of worms and their wriggling all over this thread now.
But I’d like to know some of the AT THE WHEEL figures that people have got. Not the TVR claimed Blackpool pony power.
my car 4.0 got about 175bhp and 185lbft, how does this compare to others ?
my 4litre gets 170 @ the wheels standardish....and 215 @ the flywheel
Austec measured my std 4ltr Chim at:
Power: 165bhp @ Wheels (205bhp @ Fly)
Torque: 215lbft @ Wheels (263lbft @ Fly)
They seemed to think that it was down on power a bit as the engine had been running lean for a while and 'coked up' so they thought it should recover some power after a while of running properly and having an engine cleaner additive run through it.
Alex
Power: 165bhp @ Wheels (205bhp @ Fly)
Torque: 215lbft @ Wheels (263lbft @ Fly)
They seemed to think that it was down on power a bit as the engine had been running lean for a while and 'coked up' so they thought it should recover some power after a while of running properly and having an engine cleaner additive run through it.
Alex
AlexB said:
Austec measured my std 4ltr Chim at:
Power: 165bhp @ Wheels (205bhp @ Fly)
Torque: 215lbft @ Wheels (263lbft @ Fly)
They seemed to think that it was down on power a bit as the engine had been running lean for a while and 'coked up' so they thought it should recover some power after a while of running properly and having an engine cleaner additive run through it.
Alex
That is 18.5% transmission losses - seems very high.
And below (Kim)is 22.7% increas over the rwhp numbers!
At the PH rolling road day in January, my breathed on 4.0 showed 231 bhp and 250 ft/lbs at the fly - which equates to 181 and 205 respectively at the wheels.
My TR has 218 rwhp (on a good day) if I added 22.7% ontop that I'd get 267.5bhp - which is cloud cookoo land. (Different older gearbox, so 'should be higher'). I recon 16% is about right (253bhp) - no way is it more.
An LS6 is supposed to make 360ish rwhp if I added 22.7% I'd have 442bhp - No Way.
Never have really trusted these flywheel calculated rollers.
stackmonkey said:
If it helps at all, my Chim 500 Taraka was measured at 257bhp and 271lbft at the wheels at Holeshot, bradford less thana couple of weeks ago. TVR Power gave transmission losses at approx 20% (it's a late 95N car) giving engine figures of 320bhp and 340lb ft.
Big difference with my P reg 500 taraka at surrey rolling road - 225 at wheels and calculated 286 at the fly, and of all the modded TVRs that day mine recorded the highest score -- but only by the infamous knats bit. Did you get Taraka extras?
jellison said:
Austec measured my std 4ltr Chim at:
Power: 165bhp @ Wheels (205bhp @ Fly)
Torque: 215lbft @ Wheels (263lbft @ Fly)
They seemed to think that it was down on power a bit as the engine had been running lean for a while and 'coked up' so they thought it should recover some power after a while of running properly and having an engine cleaner additive run through it.
Alex
That is 18.5% transmission losses - seems very high.some pendant said:
I make it closer to 19.5%
And below (Kim)is 22.7% increas over the rwhp numbers!
At the PH rolling road day in January, my breathed on 4.0 showed 231 bhp and 250 ft/lbs at the fly - which equates to 181 and 205 respectively at the wheels.some pendant also said:
I make that figure (181=231)a 21.6% correction
My TR has 218 rwhp (on a good day) if I added 22.7% ontop that I'd get 267.5bhp - which is cloud cookoo land. (Different older gearbox, so 'should be higher'). I recon 16% is about right (253bhp) - no way is it more.some pendant yet again said:
at 22.7% I would say it equates to 282and at 16% 259.5
An LS6 is supposed to make 360ish rwhp if I added 22.7% I'd have 442bhp - No Way.
some pendant yet again also said:
465.7
Never have really trusted these flywheel calculated rollers.
Agree about corrections, I prefer wheel figures to fly, in which case mine at 230/275 is a 16.36% correction acceptable IMHO
. As for what road they were all done on, I think you'll find they are all much as much and differnt every day
. Mine and the first one were on the same RR and the PH day one was different again. A recent cerbie shot out day just manually used 20% across the board, go figure
. HJarry
paddym said:
If it helps at all, my Chim 500 Taraka was measured at 257bhp and 271lbft at the wheels at Holeshot, bradford less thana couple of weeks ago. TVR Power gave transmission losses at approx 20% (it's a late 95N car) giving engine figures of 320bhp and 340lb ft.
Big difference with my P reg 500 taraka at surrey rolling road - 225 at wheels and calculated 286 at the fly, and of all the modded TVRs that day mine recorded the highest score -- but only by the infamous knats bit. Did you get Taraka extras?
Yes, heat baffle plate, ignition coil, half of pre-cats removed, not to mention 8 pistons, oil pump, starter motor plus override, battery, etc etc....
The PH Chimaera day at Surrey RR on 30th April was an eye-opener for me.
About 13 Chims were tested on the same day on the same road. There were some surpises.
My car is a 5.0 with ACT twin carbon-fibre throttle bodies, Crane Cam, coated exhaust and Mark Adams chipped.
I was told by the previous owner it had made 297BHP at the flywheel about 18 months ago at a different rolling road and that that was a good output for one of these engines.
At Surrey RR it showed 220BHP at the wheels, which was interpolated back to 277BHP at the flywheel. I was slightly disappointed, but there may be reasons for the low reading.
Most likely, the Surrey RR reads lower (truer?) than other RR. Also the car hasn't been serviced in a year. Also it was using standard 97 octane fuel (dunno if that would make much difference though).
I was cheered, however, by the fact that is was putting out more power than the other 12 chims (but only just beat a 4.5 and a standard 500 which was running rich.
Also worth noting was that although the torque peaked exactly as expected at 295ftlb at 4200rpm, the mods provided torque of 285ftlb right from 2500rpm.
There was another 500 there, all standard, that had higher torque than mine, but lower peak power.
About 13 Chims were tested on the same day on the same road. There were some surpises.
My car is a 5.0 with ACT twin carbon-fibre throttle bodies, Crane Cam, coated exhaust and Mark Adams chipped.
I was told by the previous owner it had made 297BHP at the flywheel about 18 months ago at a different rolling road and that that was a good output for one of these engines.
At Surrey RR it showed 220BHP at the wheels, which was interpolated back to 277BHP at the flywheel. I was slightly disappointed, but there may be reasons for the low reading.
Most likely, the Surrey RR reads lower (truer?) than other RR. Also the car hasn't been serviced in a year. Also it was using standard 97 octane fuel (dunno if that would make much difference though).
I was cheered, however, by the fact that is was putting out more power than the other 12 chims (but only just beat a 4.5 and a standard 500 which was running rich.
Also worth noting was that although the torque peaked exactly as expected at 295ftlb at 4200rpm, the mods provided torque of 285ftlb right from 2500rpm.
There was another 500 there, all standard, that had higher torque than mine, but lower peak power.
vixpy1 said:
A recent cerbie shot out day just manually used 20% across the board, go figure
No it did'nt Harry, get your facts right before you post things please.
Apologies if thats incorrect. Pretty sure that was the case though.
I did ask around on the day and there seemed to be a level of confusion about what the figures were about, blind leading the blind came to mind, two men and a shed setting out their stall.
Quiet happy to be corrected, not sure what it proved beyond a set of figures on the same day, which in its self is no bad thing, its just he implictions that it is a 'British Standard' by some.
Which is why I asked on another thread what the wheel figures were, to see if there was any recognised value to them before the added correction.
Still not sure of the overall value myself, I've seen open days where a quick 5 minute power run is available at 0 cost let alone 35ukp a pop
, but each to there own. At the end of the day, if people feel there is value in this then they will keep on coming, if they don't so be it.
Harry
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