Viper Alley - Dodge Viper Forum - View Single Post - RSI 1059 RWHP

SRT Mike · December 4th, 2003, 11:31 PM

There is a limit on how much power you can make vs. displacement, and I personally don't think 1059RWHP is that close to the max limit, although probably not TOO far off it.

It's not just about PSI, it's about how much air. A 1/4" hose at 20psi is flowing less air than a 5-foot duct at 10psi. The reason BS was called before is that if a motor is stock, then the flow doesn't change - so PSI is the only factor. But in a modified motor, flow is very important. A free breathing motor sucking in 16psi could be making a lot more power than a stocker.

If you figure, for example, that a 510cid stroker made 600RWHP, and since ambient is around 14psi, and they are at 16psi, they are putting in 115% more air and the theoretical limit would, I believe, be 115% of what the motor was making without any boost, which would be 1,285RWHP. 1,059RWHP is 82% of the theoretical most they could get... so are they able to squeeze that much out? I don't know how 82% rates for a number, but to me it sounds like it's within the bounds of reason. Furthermore, is it really 16.0PSI? Guages aren't 100% accurate and boost changes with RPM, so maybe it's 16.9 or the guage has a 1.5psi error range... and who knows how well they can build a motor? Maybe they can get a fair bit more than 600RWHP on a stroker? Wasn't LPE around the 700+RWHP range on their big motor package?

However you slice it, 1059RWHP on 16psi on a well tuned stroker is certainly within the bounds of reason, IMO.

December 4th, 2003, 11:31 PM	#14
SRT Mike Senior Member SRT Mike is offline Join Date: Jan 2003 Posts: 3,290 Rep Power: 13	Re: RSI 1059 RWHP - Fact or BS ? There is a limit on how much power you can make vs. displacement, and I personally don't think 1059RWHP is that close to the max limit, although probably not TOO far off it. It's not just about PSI, it's about how much air. A 1/4" hose at 20psi is flowing less air than a 5-foot duct at 10psi. The reason BS was called before is that if a motor is stock, then the flow doesn't change - so PSI is the only factor. But in a modified motor, flow is very important. A free breathing motor sucking in 16psi could be making a lot more power than a stocker. If you figure, for example, that a 510cid stroker made 600RWHP, and since ambient is around 14psi, and they are at 16psi, they are putting in 115% more air and the theoretical limit would, I believe, be 115% of what the motor was making without any boost, which would be 1,285RWHP. 1,059RWHP is 82% of the theoretical most they could get... so are they able to squeeze that much out? I don't know how 82% rates for a number, but to me it sounds like it's within the bounds of reason. Furthermore, is it really 16.0PSI? Guages aren't 100% accurate and boost changes with RPM, so maybe it's 16.9 or the guage has a 1.5psi error range... and who knows how well they can build a motor? Maybe they can get a fair bit more than 600RWHP on a stroker? Wasn't LPE around the 700+RWHP range on their big motor package? However you slice it, 1059RWHP on 16psi on a well tuned stroker is certainly within the bounds of reason, IMO.