PRM Intake Dyno'ed
#41
04-16-2009, 12:10 AM
Join Date: Oct 2008
Location: Orlando, FL
Posts: 2,373
Nobody is questioning the gains. 7whp is great from an intake. People are concerned about the torque numbers and the gains/losses below 4k.
#42
04-16-2009, 09:58 AM
Assuming this is repeatable, 7hp is a decent peak gain. More than I would have expected from just an intake.
Something I think is obvious but often overlooked, though, is where the gains can be expected. If you look at the hp graph, the lines have very little separation up to 5000 RPM, 2-3hp at most. It's not until 5500 that there starts to be more separation. So the power gains are mainly only in a 1500 RPM band (5500 - 7000). With the Fit's short gearing, especially first and second gears, you zip through that 1500 RPM band pretty quickly. At higher speeds/gears, you spend more time pulling through that 5500-7000 range where the gains are.
7 hp is nothing to sneeze at, but how much of that gain one experiences has a ton to do with the conditions you drive in. Pure city drivers would likely see very little improvement while those having to pass on the highway or doing track days will reap much more of the benefit.
Something I think is obvious but often overlooked, though, is where the gains can be expected. If you look at the hp graph, the lines have very little separation up to 5000 RPM, 2-3hp at most. It's not until 5500 that there starts to be more separation. So the power gains are mainly only in a 1500 RPM band (5500 - 7000). With the Fit's short gearing, especially first and second gears, you zip through that 1500 RPM band pretty quickly. At higher speeds/gears, you spend more time pulling through that 5500-7000 range where the gains are.
7 hp is nothing to sneeze at, but how much of that gain one experiences has a ton to do with the conditions you drive in. Pure city drivers would likely see very little improvement while those having to pass on the highway or doing track days will reap much more of the benefit.
#43
04-16-2009, 09:58 AM
no torque loss!!
Hey guy's,
Its pretty evident that there was no torque loss, look at the graph,
the kit made 1 ft lbs of peak torque after 4500 rpm, the number on the graph is 98 not 90. There is even more gains in torque after 4500 rpms, look at the graph!!!
As far as the graph starting a 4000 rpm's, thats the nature of the beast with a Dyno Jet,especially with a low hp car like the Fit.You have to go through the gears & get those rollers spinning, by the time you get into the gear of choose in this case being 3rd,you have no choose but to start the run with the rpm's were they are,know if you were to slow the rpm's down when your in that gear, you would bog out the motor and have a bad run.
Its kinda like trying to start the car off in third gear instead of first, big time bog!! besides if you try & do a wide open throttle at say 2000 rpm's
the motor would start to ping & kick back, puts alot of strain on this little motor & you don't want to do that.
i hope that answers some of your ???'s
Its pretty evident that there was no torque loss, look at the graph,
the kit made 1 ft lbs of peak torque after 4500 rpm, the number on the graph is 98 not 90. There is even more gains in torque after 4500 rpms, look at the graph!!!
As far as the graph starting a 4000 rpm's, thats the nature of the beast with a Dyno Jet,especially with a low hp car like the Fit.You have to go through the gears & get those rollers spinning, by the time you get into the gear of choose in this case being 3rd,you have no choose but to start the run with the rpm's were they are,know if you were to slow the rpm's down when your in that gear, you would bog out the motor and have a bad run.
Its kinda like trying to start the car off in third gear instead of first, big time bog!! besides if you try & do a wide open throttle at say 2000 rpm's
the motor would start to ping & kick back, puts alot of strain on this little motor & you don't want to do that.
i hope that answers some of your ???'s
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