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How's your trans?
Posted by derf (more from derf) on Sat, 13 Mar 2010 12:26:27
In Reply to: Re: 300Hp!! hardl;y, Chris9k
[Profile/Gallery]
, Fri, 12 Mar 2010 20:56:34
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I've gone thru 3 arguably 4
But my current car is only set at 20 psi.. under 'good' conditions.
More.. than enough for it's Chassis etc.
Hardly even close to your boost levels though. Although I have in the past run a previous 9K up to 25.. see the burst trans bit above.
Before .. the new found / recent 'resurgence' of DIY Saab Perf activities, the accepted ( proven ?) rule of thumb was 5 to 6 Hp per PSI above stock boost. (why? cuz the Head design and the cam timings and the induction/ex system is errr.. Poor... for performance purposes) So 20 psi equaled, arguably, 7 of 'extra' boost .. so 5 x 7 = 35 OR if optimistic 6 x 7 = 42 'additional' hp, certainly a nice result, but hardly massive.
Saab engines were designed/setup for smooth power using turbo boost, these are NOT Hi Perf motors by ANY yradstick, not surprisingly, as they were never intended/designed to be.
HP ratings are always 'suspicious' numbers. Notably v few are low guesses.. Human nature :-) But don't get me started on those horrid Dyno-Jet gizmos and their typical 15/20% error factor. They are for charging large being openly sold as "profit centres" .
Witness how a silly Civic engine manages 300 hp on 10 psi.. while a Saab requires serious effort and costs to do similar.
Not a criticism .. just an observation.
posted by 207.6.237...
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