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SVTPerformance's Chain of Restaurants
The Blower Bistro
how much hp does 1lb of boost add?
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<blockquote data-quote="Taz" data-source="post: 2607068" data-attributes="member: 2127"><p>Are you implying that my simple 7% rule of thumb is invalid? Well, maybe it is. Let's take a look ...</p><p></p><p>I see that you have cited the difference in your DSM's HP increase per psi boost before and after some significant modifications to the motor itself. Okay, take all the boost away. Don't you think the engine HP without ANY boost at all went up a wee bit? I imagine so. So you'd have a new base HP to calculate from, then, wouldn't you? Yep. That having been said, 7% rule of thumb might be valid both before and AFTER your engine mods.</p><p></p><p>Also, what does the phrase "rule of thumb" mean to you? My interpretation of that phrase is "rough estimate." It does not mean "exact gain," since, as you said, there are many factors that will skew that estimate one way or another. I've personally seen cars gain as few as 5% or as much as 9% per psi at the same boost levels, but, again, as a "rule of thumb" seven percent is a good average.</p><p></p><p>Finally, note that this rule of thumb is intended for use ONLY with boost levels up to about 10, maybe 12, psi or less. (At higher boost levels, it's a different ballgame.) If you were pushing significantly more boost with your DSM, which I imagine you were, this particular "rough estimate" most likely wouldn't be applicable.</p><p></p><p></p><p>T-</p></blockquote><p></p>
[QUOTE="Taz, post: 2607068, member: 2127"] Are you implying that my simple 7% rule of thumb is invalid? Well, maybe it is. Let's take a look ... I see that you have cited the difference in your DSM's HP increase per psi boost before and after some significant modifications to the motor itself. Okay, take all the boost away. Don't you think the engine HP without ANY boost at all went up a wee bit? I imagine so. So you'd have a new base HP to calculate from, then, wouldn't you? Yep. That having been said, 7% rule of thumb might be valid both before and AFTER your engine mods. Also, what does the phrase "rule of thumb" mean to you? My interpretation of that phrase is "rough estimate." It does not mean "exact gain," since, as you said, there are many factors that will skew that estimate one way or another. I've personally seen cars gain as few as 5% or as much as 9% per psi at the same boost levels, but, again, as a "rule of thumb" seven percent is a good average. Finally, note that this rule of thumb is intended for use ONLY with boost levels up to about 10, maybe 12, psi or less. (At higher boost levels, it's a different ballgame.) If you were pushing significantly more boost with your DSM, which I imagine you were, this particular "rough estimate" most likely wouldn't be applicable. T- [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Blower Bistro
how much hp does 1lb of boost add?
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