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Large bhp or torque?
#211946
11/10/2006 20:59
11/10/2006 20:59
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Anonymous
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Anonymous
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After a run in with a nissan nevaro that easily out accelerated my 20v n/a It has 170bhp with 408nm of torque 2ton 20v n/a has 147 bhp and 186nm of torque 1.2ton Is it better having large torque over larger bhp? Cheers TC
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Re: Large bhp or torque?
#211947
11/10/2006 21:04
11/10/2006 21:04
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Well, quite simply - BHP is a function of torque and RPM. There is a formula I can provide if you wish... If you're not a lazy driver then its always beneficial to have more bhp - because you'll make sure your high revving and peaky car is in the correct gear to make the best of it. BHP is a way of expressing the amount of work being done by the engine at that time.
You probably left your car in too high a gear, ya? If you'd down shifted and made better use of your superior power/weight ratio you'd have seen him off. His torque to weight is vastly better however, so if you were to slug it out at low rpm in a high gear he'd trounce you.
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Re: Large bhp or torque?
#211948
11/10/2006 21:09
11/10/2006 21:09
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Anonymous
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Anonymous
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Only real way to beat the 4x4 brigade is more power? I think Fiat did a turbo version of the Coupe..memory serves they were 220Hp as standard?
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Re: Large bhp or torque?
#211949
11/10/2006 21:11
11/10/2006 21:11
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Quote:
Only real way to beat the 4x4 brigade is more power?
I never said that did I?
Oh and don't you mean 'For throwing money into' in your sig?
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Re: Large bhp or torque?
#211950
11/10/2006 21:13
11/10/2006 21:13
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Cheers for that Matt I was quite surprised at how well the nissan pulled away, I was in third and quite low down the rev range saw what was coming and put the foot to the floor expecting to see his nose start retreating. (It normally does in my 16VT so I expected similar in my 20v N/A) only for him to carry on past with ease! Thanks for the explanation, is that why the golf gti diesels are quick due to low reving engines and high torque outputs? Cheers TC
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Re: Large bhp or torque?
#211951
11/10/2006 21:26
11/10/2006 21:26
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Anonymous
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Humerous I was being. English confuses me: in most languages object pronouns come before the verb....
I liked my na lots. 2000 VIS with a bit more power, but I learned that it wasn't great for burning off 4x4's or much else. Overtake yes, but not that quickly with 154Hp and 1.3t. 118Hp/ton? and it was game on & pretty equal with most hot hatches.
NA is a great car but rocket assisted it ain't.
(Ducks the flying bricks from the n/a owners association).
Last edited by Skodaman; 11/10/2006 21:27.
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Re: Large bhp or torque?
#211952
11/10/2006 21:43
11/10/2006 21:43
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Joined: Jan 2006
Posts: 5,988 Sunny Darlo
Wishy
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Sunny Darlo
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Loved my n/a to bits so no bricks coming from my direction. Yes it would struggle getting rid of a modern TD but so what! It was still the same great looking car and still great fun to drive. Just didn't have one of those turbo thingies attached.
Up yours Photobucket.
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Re: Large bhp or torque?
#211956
12/10/2006 02:17
12/10/2006 02:17
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Joined: Dec 2005
Posts: 5,405 Castle Combe
Flea
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Quote:
I don't get it, my dad's diesel has the same torque as a standard coop and weighs the same, yet takes 9 secs to 60. So obviously it isn't torque that dictates the acceleration.
Torque is the turning force applied by the engine whereas bhp is a factor of this turning force multiplied by rpms. BHP = Torque x RPM / 5252. Therefore, up to a certain point a diesel can be as fast or faster than petrol car i.e. in gear short blasts, but the ultimately due to the short rev range it will loose out on the upshift.
Diesels cannot rev beyond 4000-5000rpm therefore they have to be geared accordingly. If they could go beyond this point then they would surpass petrol cars but alas this is not physically possible. Think of an F1 car which produces circa 250-300lbs/ft a relatively modest amount of torque. The difference exists when they can produce this torque at 15000+rpms and therefore adopt suitable gearing i.e. long and low ratios, for extreme acceleration and response.
When people talk of having a nice torquey car over bhp this means low down and mid-range ability. If you had the same torque at the top end then there would be no compromise i.e. you would have the "bhp" also, but unfortunately with forced induction it is very hard to have your cake and eat it
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Re: Large bhp or torque?
#211958
12/10/2006 02:34
12/10/2006 02:34
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Anonymous
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What you want is a good amount of torque over a large range of revs.
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Re: Large bhp or torque?
#211960
12/10/2006 03:16
12/10/2006 03:16
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Joined: Jan 2006
Posts: 5,748 Pistonheads
Brewster
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Quote:
Electric engines! Peak torque at stall
Neil
And none at speed!
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Re: Large bhp or torque?
#211962
12/10/2006 15:29
12/10/2006 15:29
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Anonymous
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Seem to remember Rover tried that with the P9 back in the 60's but couldn't get it to work...Modern version would be best with a small, high power aviation turbine but the cost, heat & engineering problems would be high.
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