370z GTM Stage 2 Supercharger Dyno (Dynopack @Hawaii)

kosstick · 09-27-2011, 09:57 AM

Quote:

Originally Posted by Reality

OP,
Diffferent Dyno #'s should be taken with a grain of salt. I wouldn't get to hung up on a 15whp difference. That could all be attributed to weather conditions for that particular day. Also the fact that you are comparing results from two completely different climate zones.
Well my personal experience tells me your knowledge is lacking and incorrect. I dyno'd my old 35th on both a Dynojet (industry standard) and a Dynapack, within in a week of each other, on almost an identical morning (weather wise). Both results were within 1hp & 1ft/lbs of each other.

MY personal experience and logic would say that a HUB dyno (Dynapack) would get great numbers than a DYNOJET. Great Example is Church Automotive in Los angeles that yields greater numbers than dynojets mainly because it is reading the power from the hub. When you have to spin your wheels for a DYNO to read your HP it will be lower because power is lost when it has to be transferred to the wheels.

Of course the owner of the DYNO could make adjustments to his DYNOPACK to account for the higher HP. Not sure I don't own one just stating what I know from Experience and what logic tells me (power is lost at wheels)

Reality · 09-27-2011, 10:32 AM

Quote:

Originally Posted by kosstick

MY personal experience and logic would say that a HUB dyno (Dynapack) would get great numbers than a DYNOJET. Great Example is Church Automotive in Los angeles that yields greater numbers than dynojets mainly because it is reading the power from the hub. When you have to spin your wheels for a DYNO to read your HP it will be lower because power is lost when it has to be transferred to the wheels.

Of course the owner of the DYNO could make adjustments to his DYNOPACK to account for the higher HP. Not sure I don't own one just stating what I know from Experience and what logic tells me (power is lost at wheels)

So you have dyno'd your own personal vehicle on both types? and with almost all things being equal, have seen the drastic differences?

-Church's automotive, balloon dyno is legendary... and shouldn't be included in this convo.

All load based dyno's can be altered to show fictitious gains, by adding correction factors etc.. which is why most consider the Dynojet to be the defacto standard.

Regardless, dyno #'s should only be used to show increases from baseline. Trap speeds will tell you what you are really putting down.

kosstick · 09-27-2011, 10:35 AM

Quote:

Originally Posted by Reality

So you have dyno'd your own personal vehicle on both types? and with almost all things being equal, have seen the drastic differences?

-Church's automotive, balloon dyno is legendary... and shouldn't be included in this convo.

All load based dyno's can be altered to show fictitious gains, by adding correction factors etc.. which is why most consider the Dynojet to be the defacto standard.

Regardless, dyno #'s should only be used to show increases from baseline. Trap speeds will tell you what you are really putting down.

Yes I have, all dyno numbers in the end are relative, all I am saying HUB dynos should read higher on average because they are technically removing one large variable (wheels/tires - rotational mass).

I get about 350 WHP on a Dynopack and about 320ish on dynojet

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