"XXX BHP" said the factory...
Discussion
How do factories get away with quoting BHP figures which almost always do not tally up to the cars actual power output.
Example. The 4.5 cerbera is quoted as having 420 bhp. But most owners have about 375 (Some more, but some as little as 340, which is only 80% truthful so to speak)
How is it that they can get away with that, year after year. It would be like saying a griff had a 5 litre engine, when in fact it only had a 4, or claiming that ABS was standard when in fact it was not. I exaggerate, but you see my point.
Another question: Do fezzas, lambos and other exotica actually put out the amount of power their manufacturers claim?
No biggie, just curious
>> Edited by UKBob on Friday 14th October 18:16
Example. The 4.5 cerbera is quoted as having 420 bhp. But most owners have about 375 (Some more, but some as little as 340, which is only 80% truthful so to speak)
How is it that they can get away with that, year after year. It would be like saying a griff had a 5 litre engine, when in fact it only had a 4, or claiming that ABS was standard when in fact it was not. I exaggerate, but you see my point.
Another question: Do fezzas, lambos and other exotica actually put out the amount of power their manufacturers claim?
No biggie, just curious
>> Edited by UKBob on Friday 14th October 18:16
This is a good one!! i can make a tvr 500 produce what tvr claim on our engine dyno! however the actual output is only 280 bhp for a good one confused?? many manufactures use different dyno methods of recording horsepower who is correct you will never no!! the way we dyno an engine is typical of most engine builders, we put maximum load on the engine with wide open throttle and gradually realese the load so the revs rise all the way through to max rpm take the readings, correction factors etc and you have your horsepower, but you can on an engine dyno have the engine running at idle set the load so the engine wont rev past the max bhp limit and suddenly snap the throttle open, the engine goes from idle to 6000 rpm and records a figure of 320 bhp as i say who is right? in the real world a car cannot acheive this, but the formentioned manufactures are not actually lying!!
Do TVR quote SAE or DIN specs. I think that the SAE standard assumes no ancilliaries. The DIN standard assumes all ancilliaries attached. If memory serves The DIN standard says that the engine should be able to achieve 110% of the rated output. Rated output being the maximum continuous power output. Maybe this only applies the diesel's?
vixpy1 said:
Ferrari are usually a bit optimistic, as are BMW M power cars, although run of the mill BMW's tend to be spot on..
VW are always spot on, with their diesels putting out way over quoted.
Porsche are always Spot on as well, as are Ford.
VW diesels are overquoted?, i never knew this, from a couple of Mk4 TDIs ive seen they seem to be pretty spot on too?
Gazboy said:
[quote=YamR1,V64motion]
vixpy1 said:
Ferrari are usually a bit optimistic, as are BMW M power cars, although run of the mill BMW's tend to be spot on..
VW are always spot on, with their diesels putting out way over quoted.
Porsche are always Spot on as well, as are Ford.
ah ok, i thought he may have meant by a bigger margin.
VW diesels are overquoted?, i never knew this, from a couple of Mk4 TDIs ive seen they seem to be pretty spot on too?
He means that if VAG quote 130hp, they come out at 137hp (for example).[/quote]
Most VW TDIs Ive seen the RR result from are over the std 130/150bhp spec as are the 1.8T petrol engines. Some 225bhp engines are easily putting out 240ishbp as std.
Tiv outputs are somewhat suspect from what Ive seen, but as per the 450 thread in the chim section mine is only 30bhp and 10lb torque off so called std.
I think any non recent AJP engined tiv may suffer power/reality ratio sydrome................just doesn't sound as nice
Tiv outputs are somewhat suspect from what Ive seen, but as per the 450 thread in the chim section mine is only 30bhp and 10lb torque off so called std.
I think any non recent AJP engined tiv may suffer power/reality ratio sydrome................just doesn't sound as nice
225 said:
Most VW TDIs Ive seen the RR result from are over the std 130/150bhp spec as are the 1.8T petrol engines. Some 225bhp engines are easily putting out 240ishbp as std.
Tiv outputs are somewhat suspect from what Ive seen, but as per the 450 thread in the chim section mine is only 30bhp and 10lb torque off so called std.
I think any non recent AJP engined tiv may suffer power/reality ratio sydrome................just doesn't sound as nice
so is the 4 motion an accurae 204?,sorry just curious
225 said:
Couldn't tell you. I used to own a Leon Cupra R with the 225bhp 1.8T and most people when RR'd found the output to be higher (at various RR I might add), same with the derv engines.
its funny you shuld say that, i used to have an A3 1.8T and i drove a Golf Gti that belongedto a friend, same engine but mine felt a bit quickeri guess some engines come out better than others.
225 said:
Wasn't a 150bhp golf and 180bhp Audi by any chance was it
Your right, it depends alot on the first owner as well though. A well run in/looked after engine will have a good 20bhp difference over a cained/ragged to death lump IMO
lol no it was the FF 150bhp Audi not the 180 Quattro, maintenence is crucial to a car i agree, do you think oil can make a difference over a long period? and also the quality of plugs/leads.
>> Edited by YamR1,V64motion on Saturday 15th October 02:05
Do manufacturers do their power testing with the unit actually in a test vehicle, or is it on a test rig with something measuring power straight from the crank?
If it's the latter, I wuld assume all sorts can be done to 'massage' the figures.
(Edited because I can't trype thos mroaning....)
>> Edited by MarkoTVR on Saturday 15th October 08:34
If it's the latter, I wuld assume all sorts can be done to 'massage' the figures.
(Edited because I can't trype thos mroaning....)
>> Edited by MarkoTVR on Saturday 15th October 08:34
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