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Re: 300+ HP on a FWD saab - sure...
Posted by matsuda [Email] (more from matsuda) on Sun, 11 Sep 2005 17:22:25
In Reply to: 300+ HP on a FWD saab?, joshua, Fri, 2 Sep 2005 12:11:32
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You could write multiple books on the subject since it's so broad, but in general it's the TORQUE at middle rpm not the HP that's the limiting factor - low end torque produces the twist that tugs the wheel etc. - the viggen has 230hp, but 250+ lb/ft torque that tries to break loose. The relation between t&hp is:
HP = torque x RPM / 5252
Why does Saab concentrate on Torque? That's what accelerates you most from a stop, but also:
Low end torque produces better mileage than high end rpm - remember that's one of Saabs big advertisements (Turbo acceleration with good mileage - 9-5 is best mileage car in large classification - Getting the turbo to kick in at lower rpm cuts gas consumption and the car accelerates quicker because you get to speed with less engine rotations and let off the gas sooner.
High RPM eats the engine up faster, so the engines that rev less last longer (the japanese have found ways to remove harmonics to mitigate this better than others...)
BUT the limiting factor in fwd power is trying to make the wheels turn and accelerate instead of having the 2 functions seperate on each axle -FWD wants to lift the struts when you punch it, but you're trying to turn, so it creates a pulling feeling. AWD just splits the power of course so the front can concentrate more on turning while the rear helps push but feeds the power better than just RWD - drawback? Friction losses are greater for AWD than for FWD or RWD because of the dual differentials to send power...
SO if the extra HP comes on only at high RPM's then the wheels are moving fast enough to not spin and you can have more than 300, but that makes for a peakier, race like engine -
posted by 68.92.102...
Posts in this Thread:
- 300+ HP on a FWD saab?, joshua, Fri, 2 Sep 2005 12:11:32
- Re: 550 HP 2.0l AWD rally Saab 9-3 - 2.2 sec 0-100k, matsuda, Sun, 11 Sep 2005 17:27:49
- Re: 300+ HP on a FWD saab - sure..., matsuda, Sun, 11 Sep 2005 17:22:25 <-- Viewing This Message
- Hard geared AWD....., Mike Lynch
, Sat, 3 Sep 2005 17:32:51 - Re: 300+ HP on a FWD saab?, AlaskanViggen, Fri, 2 Sep 2005 19:29:49
- Re: 300+ HP on a FWD saab?, Nick-Prov, Fri, 2 Sep 2005 12:54:01
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