Rated HP vs. Dyno HP???
#12
Re: Rated HP vs. Dyno HP???
Hmmm well there is a reason that we think alike... 89' 357 SR1
Although it has aftermarket Fuel injection with MPI. Not too many other perf mods. It does have a new interior, dash and gages.
This gave me 4 MPH on GPS...of course I did not have gps before the gage changes...hahaha
Although it has aftermarket Fuel injection with MPI. Not too many other perf mods. It does have a new interior, dash and gages.
This gave me 4 MPH on GPS...of course I did not have gps before the gage changes...hahaha
#13
Platinum Member
Platinum Member
Re: Rated HP vs. Dyno HP???
i have always heard that merc motors exceed their rating's,a good example is the efi 525,they say it is really close in speed to a 575. As far as dyno operators trying to make good print and sell their services in a magazine article,i don't trust their before #'s,it looks ALOT better to say all their mods gave someone 80 hp than 50 or 60,just my .02,Smitty
#14
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Join Date: Feb 2003
Location: Traverse City, Mi
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Re: Rated HP vs. Dyno HP???
Formula 377
Gotta love bolt on hp. That interior looks choice. Like the white out. Did you remove the windshield and regel coat the dash? I really updates the boat!
I freshened up the 420's in my 86' 357 kamma I thinks the cams added somewhere around 15-20 hp will see if I can break the 60 mph barrier. Maybe with some interior mods I can really turn some speed(haha)
Anyway nice looking boat.
Josh
Gotta love bolt on hp. That interior looks choice. Like the white out. Did you remove the windshield and regel coat the dash? I really updates the boat!
I freshened up the 420's in my 86' 357 kamma I thinks the cams added somewhere around 15-20 hp will see if I can break the 60 mph barrier. Maybe with some interior mods I can really turn some speed(haha)
Anyway nice looking boat.
Josh
#16
Re: Rated HP vs. Dyno HP???
Originally Posted by Perfectmix
Formula 377
Gotta love bolt on hp. That interior looks choice. Like the white out. Did you remove the windshield and regel coat the dash? I really updates the boat!
I freshened up the 420's in my 86' 357 kamma I thinks the cams added somewhere around 15-20 hp will see if I can break the 60 mph barrier. Maybe with some interior mods I can really turn some speed(haha)
Anyway nice looking boat.
Josh
Gotta love bolt on hp. That interior looks choice. Like the white out. Did you remove the windshield and regel coat the dash? I really updates the boat!
I freshened up the 420's in my 86' 357 kamma I thinks the cams added somewhere around 15-20 hp will see if I can break the 60 mph barrier. Maybe with some interior mods I can really turn some speed(haha)
Anyway nice looking boat.
Josh
Ok Just explain the "Kamma" to me??? and yes I removed the winsheild along with every nut bolt gage and even found a bikini under the dash too! Thanks for the comments, even after all the time it took to do it I know it was worth it, but always nice to hear it too. Got any shots of your 357?
Marc
#17
Platinum Member
Platinum Member
Re: Rated HP vs. Dyno HP???
JBonz,
Torque is measured on a dyno.
RPM is measured on a calibrated tachometer.
HP is torque multiplied by engine speed.
So if you got a good tach and are bolted to a dyno, you CAN accurately measure HP on it.
NOW, each dyno is located at a different altitude.
Ambient temperatures, cooling capacity of the system, and steady state response time can also vary from dyno to dyno.
All dynos have the capability to approximate what the HP would be if "corrected" to sea level altitude, a set temperature, and humidity of the intake/ambient air.
Hydraulic BRAKE dynos can measure STEADY STATE power which is more accurate than the INERTIAL dynos that measure the acceleration of a weighted roller (these are usually used on wheel-driven machines: the DYNOJET dyno is an example of an inertial dyno).
Bottom line is that most dynos vary a bit from each other as far as the results you'll get, but if operated with care, a brake dyno is considered to be fairly consistent.
Torque is measured on a dyno.
RPM is measured on a calibrated tachometer.
HP is torque multiplied by engine speed.
So if you got a good tach and are bolted to a dyno, you CAN accurately measure HP on it.
NOW, each dyno is located at a different altitude.
Ambient temperatures, cooling capacity of the system, and steady state response time can also vary from dyno to dyno.
All dynos have the capability to approximate what the HP would be if "corrected" to sea level altitude, a set temperature, and humidity of the intake/ambient air.
Hydraulic BRAKE dynos can measure STEADY STATE power which is more accurate than the INERTIAL dynos that measure the acceleration of a weighted roller (these are usually used on wheel-driven machines: the DYNOJET dyno is an example of an inertial dyno).
Bottom line is that most dynos vary a bit from each other as far as the results you'll get, but if operated with care, a brake dyno is considered to be fairly consistent.