bronxbomba63

Ok, so I'm trying to calculate my rwhp since I was told that the numbers may be higher being this was on a dynocom (load bearing) dyno. Going off a site I found, hp is calculated: Hp = Tq * 5252/RPM. What I'm wondering is, should I go off of the Tq's RPM (4600), or the Hp's RPM (5550)? Going by 4600, I'm at 465rwhp....5550 has me at 386. The dyno had me at 403/408 rwhp/tq.

bronxbomba63

Forgot to mention, my mods are MMR's 1000hp kit, stage 2 comp cams, KB's 2.8LC kit 14# pulley on this dyno run, BBK long tubes and catted h pipe, borla exhaust, 300 Lph fuel pump, 60# injectors, accel cops, 3.73 gears, frpp driveshaft, and trick flow heads.

VTX1800N1

HP and torque are curves, hence the different values at different RPM.

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bronxbomba63

Yeah, but what I'm not sure about is which RPM value should I be using in the equation...HP or TQ. The equation I found doesn't specify which is used to find HP.

VTX1800N1

Torque is measured. HP is calculated from torque.

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bronxbomba63

Ok thanks! So my HP is actually 465 rather than 403?

VTX1800N1

It depends on the RPM. Both HP and torque are going to vary by RPM.

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VTX1800N1

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bronxbomba63

Right, but what I'm trying to get is what my HP would possibly read on a dyno that isn't a load bearing dyno like the DynoCom one my car was on or a Mustang Dyno. Since those dynos notoriously read low, I looked for the equation that would show what my HP should be. Going off of the 4600 RPM's that the dyno screen shot shows and the equation I found, it looks like at a 14# pulley, I would have been at 465 on that run. But like I said, that seems low to me with the mods listed.