Dyno questions?

Yamerhaw · 12-04-2008, 01:55 PM

does the weight of the rider and the gearing affect dyno numbers? seems in my uneducated mind that it would have to?

Rsv1000R · 12-04-2008, 04:44 PM

Not really, it effects performance, but not engine output. Now gearing matters with how accurate the dyno's measurement is, but the tach led is suppose to allow the dyno software to account for any gear ratio.

Gas Man · 12-04-2008, 06:19 PM

that is a debated topic of dynojet vs flowjet numbers.

It won't but that is ONE of the many points that makes the above differences.

Cutty72 · 12-05-2008, 04:37 AM

Gearing yes (possibly, depending on if you can get a tach signal)
Rider weight, no. There should be no rider weight on the bike when running on the dyno. Rider should stand straddling the bike.

Dnyce · 12-05-2008, 04:42 AM

Quote:

Originally Posted by Cutty72

Gearing yes (possibly, depending on if you can get a tach signal)
Rider weight, no. There should be no rider weight on the bike when running on the dyno. Rider should stand straddling the bike.

never seen it done like that honestly

Cutty72 · 12-05-2008, 04:47 AM

Quote:

Originally Posted by Dnyce

never seen it done like that honestly

here ya go.

he's straddling it, but not really putting any weight on the seat.

Dnyce · 12-05-2008, 04:51 AM

u know-i was lying, cuz thats your bike, and i watched most of the 1st one i think. oops lol

in person, always feets on the pegs tho-could just be the one side im standing on tho

Cutty72 · 12-05-2008, 04:54 AM

Quote:

Originally Posted by Dnyce

u know-i was lying, cuz thats your bike, and i watched most of the 1st one i think. oops lol

in person, always feets on the pegs tho-could just be the one side im standing on tho

all I've seen have been fully standing.

though one foot on the peg shouldn't affect that much, but it could throw it off.
just like if you put the tire back on the drum it will give a low reading, and forward on the drum will give a high reading. It's gotta be centered to be accurate.

And yup, that's mine. Bitch ran good that night

HRCNICK11 · 12-10-2008, 07:23 PM

Should not matter as long as its the same each time. In other words don't let the fat guy do one pull and the thin guy do the next pull. Always go out of your way to make each run the same. Check and adjust things like tire pressure and engine temperature.

The numbers don't really matter much its the difference from the stock pull to the modified pull. You should not compare dyno umbers with a different dyno.

P.S. I disagree with the standing over the bike as you can not properly work the controls and if needed for some emergency the rear brake would be hard to apply quickly. Not to mention a all gear run would be tough and they can help find a float level or starvation problem.

Mr Lefty · 12-10-2008, 08:37 PM

Quote:

Originally Posted by Dnyce

never seen it done like that honestly

same here... they're always sitting cause they have to shift... and it takes too much coordination apparently to do with out sitting

12-04-2008, 01:55 PM	#1
Yamerhaw Country Boy Join Date: Nov 2008 Location: Hicktown in NC Moto: 07 R1 Posts: 797	Dyno questions? does the weight of the rider and the gearing affect dyno numbers? seems in my uneducated mind that it would have to? __________________ “If trees could scream, would we be so cavalier about cutting them down? We might, if they screamed all the time, for no good reason.” It takes a big man to cry, but it takes a bigger man to laugh at that man.

12-04-2008, 06:19 PM	#3
Gas Man Trip's Assistant Join Date: Feb 2008 Location: Imported from Detroit Moto: 2009 HD Street Classic Posts: 12,149	that is a debated topic of dynojet vs flowjet numbers. It won't but that is ONE of the many points that makes the above differences. __________________ -Chris "Why pay somebody else to fuck up your bike?" Run Amsoil Product

12-05-2008, 04:51 AM	#7
Dnyce flyin high Join Date: Mar 2008 Location: cali Moto: 10speed huffy w/cards in the spokes Posts: 2,318	u know-i was lying, cuz thats your bike, and i watched most of the 1st one i think. oops lol in person, always feets on the pegs tho-could just be the one side im standing on tho __________________ "Racing Is Life, Everything Before and After is Just Waiting" Steve McQueen

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

12-04-2008, 04:44 PM	#2
Rsv1000R WERA White Plate Join Date: Nov 2008 Posts: 1,059	Not really, it effects performance, but not engine output. Now gearing matters with how accurate the dyno's measurement is, but the tach led is suppose to allow the dyno software to account for any gear ratio.

12-10-2008, 07:23 PM	#9
HRCNICK11 Canyon Carver Join Date: Nov 2008 Posts: 429	Should not matter as long as its the same each time. In other words don't let the fat guy do one pull and the thin guy do the next pull. Always go out of your way to make each run the same. Check and adjust things like tire pressure and engine temperature. The numbers don't really matter much its the difference from the stock pull to the modified pull. You should not compare dyno umbers with a different dyno. P.S. I disagree with the standing over the bike as you can not properly work the controls and if needed for some emergency the rear brake would be hard to apply quickly. Not to mention a all gear run would be tough and they can help find a float level or starvation problem.