Dyno Mite Dyno , Good Or No Good

why u didnt bring the srx vince ??? wish we could have one at that price around here ....
 
I am sure the dyno was off very close to 10hp.....make alot of sence....the 600srx with the motor touched should be close to 130hp....which would be close to adding 10hp to actual number displayed....this also holds true to the SXR700 with bender pipes, motor touched and a few other little mods....which would be close to 144hp..we are hoping the guy calibrates the dyno and lets us know how many hp it was out...this would give us a better indication of what our sleds actually did.
 
dirtjumper895 said:
well all, im gonna be learning how to run and use our dyno tomorrow night. I will comment back on how i like it.
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I am assuming this is a dynomite dyno as well that you will be using.
Let me know on hp calibration...how is it done.
Thanks.
 
Hey Vince the Numbers maybe off but you got the important info!! Now you can clutch for your power band and be confident you have the best set up.. Any idea why the power band on the SRX is so peaky?? Stock pipes on those engines is usually a pretty smooth power curve..
 
Dan / Jabber - I know exactly why my engine has a powerband of 200rpm , i built a srx/yz , all i need is fenders and a set of wheels ...lol ..

you were correct saying , The flow valve was very difficult to operate on this engine , when applying pressure to the engine prior to 7000 rpm the engine would bogg , therefore requiring a decrease in pressure of the flow valve , devils advocate @ that point it would jump to 8600+ , and peak horsepower was not recorded . He finnally got it on the descent from 9000rpm for a split second , but was not able to stay within the peek rpm to build exhaust heat / hp.

im gonna call him today and follow up on the calibration issues !

Well i called Mike today and he says he has it calibrated . Hung a 50lb weight off the dyno arm and plugged in his pc and it said he was negative -14lbs .He does not know how to calibrate it back to zero , and I think he has to pay to get dynomite tech to help him over the phone , therefore he says he figured out how to start the pc at 14hp. ?????????
 
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I'll check to see if we still have our manual for the dynomite. It has the calibration procedure in it. We set ours up when we first got it.. I am very surprised at the peakyness of that engine though.. My 600 has very wild porting and it still had a pretty reasonable power curve developing, that is until it starts trying to self distruct at 9000 rpm's.. LOLs You and Bob going out to Rockies on the weekend?
 
i like wild can i drive her .....lollllll/........

yes we will come and watch you and valin run on sunday , we hope to see you both do well .

i dont mind giving you the specs of the work i have done , i could pm you if you wish .i have 870 trail miles this year and avg. 16.1 mpg last sunday .
 
Hope to have all three of my sleds there. Come on over and check out the 6.. It's been a long project.. Well maybe not as long as Ryans but I'm starting to get frustrated with the wrenching. Time to ride...
 
harness racer said:
Well i called Mike today and he says he has it calibrated . Hung a 50lb weight off the dyno arm and plugged in his pc and it said he was negative -14lbs .He does not know how to calibrate it back to zero , and I think he has to pay to get dynomite tech to help him over the phone , therefore he says he figured out how to start the pc at 14hp. ?????????
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You would add 14lbs of tq, not hp. So with your last dyno run you made 133.2hp at 8700rpm so your tq would be 80~80.5
So 80tq+14= 94tq x 8700rpm / 5252 = 155hp
 
toydoc said:
You would add 14lbs of tq, not hp. So with your last dyno run you made 133.2hp at 8700rpm so your tq would be 80~80.5
So 80tq+14= 94tq x 8700rpm / 5252 = 155hp
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How did you figure 80tq...is it really possible that my SXR700 is making that much power at the crank....If Harness Racer showed 119hp on the dyno with the -14lb what are his HP numbers???
 
I don't know how good the dyno pull was or how true the power is. But I just did the math with all the numbers we have. His hp that was posted was 133.2hp at 8700rpm.
So 80tq x 8700rpm / 5252 = 132.5 hp

I don't know what the 119 would be without rpm. Plus I don't know if any numbers are right. Just if the dyno is -14lbs off, it would go on the tq number not hp. The dyno uses a engine tq number and rpm, then calculates HP base on the two.
TQ x RPM / 5252 = HP
 
well i just ran the sxr on ice and did a 114mph on GPS....I kinda have a band aid clutch set up right now...if i get my clutching worked out i am hoping to hit 116mph in 2000ft...not bad for a non power valve motor.
 
using the formula that doc provided

8450 rpm *74ft/lb tq + 14 /5252 = 141.58 hp

I GOT TO GET ME A CORAL , AND ROUND UP ALL THOSE PONIES , I THINK THEY SNEEK OUT THE EXHAUST PIPE .
 
Yamyrider....

yamyrider said:
well i just ran the sxr on ice and did a 114mph on GPS....I kinda have a band aid clutch set up right now...if i get my clutching worked out i am hoping to hit 116mph in 2000ft...not bad for a non power valve motor.
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Can you share your setup with a fellow non power valved brother?
 
Cajones2,

Its not likely that his setup would work in yours , different pipes , different porting ,etc..

114mph/ 2000ft. is ok but not tip top yet either . 118mph/2000ft. is very acheivable , the sled still has some rolling resistance and minor clutching issues , its set up for the trail until friday night that is , races on sat !!!!
 
"118mph/2000ft. is very acheivable"

Well that is good to hear! I understand our setups are different and I couldn't just bolt it in and go. Just curious to see if we were in the same ballpark.

What kind of gearing do you run to get that kind of top end? This summer I am going to work on the rolling resistance of mine....any pointers? I feel like I should paying tuition with all that i have learned from this site. ;)!
 
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