I ran my DS on Little Sahara Sandsports new dyno over the weekend. The results were very interesing.

'01 DS650.

Motor : Bone stock
Exhause : Big Gun Race Series, full pipe.
CDI : stock.
Fuel : 87 octane, pump gas.
Air box : ran both lid on and lid off, K&N filter, Outerwears cover.
Air tubes : run on outside of frame
Hose clamps on intake tube.
Carb : stock, Dynojet kit, 180 jet, needle in bottom (closest to sharp end) groove.

Results of first run, 180 jet, lid ON

Conditions,

temp: 77.8 degrees
Humidity: 20%
Bero: 28.23 in-Hg

Max HP - 39.38
Torque - 34.89
Air Fuel - 15.5 and higher above 3500 RPM

Lid off

Max HP - 38.87
Torque - 34.75
Air fuel - 16.3 and higher above 3500 RPM

Results of Second run, 185 jet, lid ON

Max HP - 40.83
Torque - 35.38
Air fuel - 15.1 and higher above 3500 RPM

Better HP with lid on!!!!
STILL to lean on top end. Need to go up to 190 jet.

I'll run it again the next trip and post the results with the 190 jet.
The needle setting apeared to be right on!

Thought you guys would be interesed in this! Any suprizes here?
Your thoughts?
Carl.

 

not bad, did they have street tires? im going to do it on easter.

 

Right on Carl

you can see that the air fuel #s gets richer with the lid off inturn the air is not comming in as fast as w/ the lid on!
what elivation was this taken apx.

thanks for the post!!

EDIT __"MY bad ignore this"[img]i/expressions/face-icon-small-blush.gif[/img]

 

I havent been thier in Months[img]i/expressions/face-icon-small-sad.gif[/img]

How much do they charge for a pull?






bigger.

 

Sam,
Actually it got LEANER with the lid off, more air less fuel.
I thik the elevation is around 1500 ft.

Shmee,
Kind of, they were not flat track, thye did have tread on them, but they were very soft!

biggerisbetter,
It is $35 for 3 runs, they were slow so they let me re-jet on the dyno.

The dyno is very new to Little Sahara (Oklahoma version) It is located at what used to be the "Oasis". It is now gone, it is now Little Sahara Sandsports. The dyno is kept there in a trailer. It got many runns over the weekend!
My DS created QUITE a croud! It was fun! People were like "HOLY SH*&T" when the numbers came up! There could not believe it was stock!

 

Hmmm. well I hope they still sell gas and food thier??? I will put my DS954 on that dyno when I get it done.




Bigger.

 

Oh yeah, they still sell gas there. There is now a restaurant next door. They are open for breakfast, lunch and dinner, also sell BEER! If you want food like snacks and stuff you will have to go up to the Ampride.

 

Of course it did [img]i/expressions/face-icon-small-wink.gif[/img]

You were lean to start out with then took the lid off and got more air and lost power [img]i/expressions/face-icon-small-confused.gif[/img] You get too lean and you will lose power. Has nothing to do with having a lid or not having a lid. Ideal is 12.7 to 1 (Air to fuel - that means for every 12.7 parts air you have 1 part fuel. For combustion, there is an ideal mixture - I'll let the pros get more into this but, understand just adding a pipe, removing the air box lid or putting a direct mount air filter on will NOT change your HP. Doing these items AND tuning the bike correctly will increase your HP.

This dyno is telling you with your lid off you get more air (because your A/F went up to 16:1) so, if you jet up for more fuel to get an A/F of 13:1 you will see more power.

The dyno is telling you to take the lid off and throw it in the fire. . . it gives you more air. . . now all you have to do is figure out which jetting / needle settings you need to tune it.

If you want even more power put the direct mount filter on before you tune it - don't tune it for in the box then put the direct mount on and expect your tuning to be on. Everytime you change things you should tune again.

 

You got better HP between the "lid on" runs just uping the jet size. Obviously your to lean to begin with. What did you expect would happen with the lid off? Get the Air/fuel mix right on the "lid off" run and you will see better HP than with lid on.

 

You guys are right, that is why I did the test both ways. There has been a lot of talk and discussion doing it both ways. That was my argument. I'm going to jet it with the lid off, it "breaths" better. There will not be a dramtic increase in HP by lowering the air fuel ratio (more fuel for the volume of air) but it will run cooler and more efficently. The perfect air/fuel ratio is 14.7 to 1 not 12.7 to 1, it's called "Stoichiometric"
I'll re-jet before re-running. I started with the 180, went to the 185 and was still lean. I think the 190 will do it.