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Cowboytutt
| | Posted on Wednesday, August 04, 2010 - 02:59 pm: | 
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'Drive, I just went through this with Vance and Hines Racing, their Fuel Pack, and my Harley.
We ran it on our dealership dyno, and it looked lean at 4k with my pipe/air cleaner combo. I called up V&H and they asked what kind of load we running on it as many older dyno's don't have any way to adjust it. Granted, the drum has some weight, but there is more to it than that my friend.
V&H said they would not even consider providing me with new settings until we ran the bike under AT LEAST a 10% load.
I went back to the mechanic, explained to him what V&H said, asked if he ran the bike under load, and if that particular dyno had the ability to program different loads settings.
He acknowledged he had not run the bike under load but yes, the dyno had the ability to do that.
You have to keep in mind that dyno technology has really improved over the years and they have become more and more sophisticated.
There was some concern about "loading the drum" and its effect on the bike's clutch but everyone seemed in agreement that a 10% increase would not hurt the bike.
In the end, and after considering the many hours of tuning that V&H had put into making the map for my combo, and the expense of more dyno runs, and the condition of the spark plugs which looked fine, I decided it was not worth the effort.
So, thats my dyno story. 
Cheers!
-Tutt |
Vinb
| | Posted on Wednesday, August 04, 2010 - 03:53 pm: |
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I'm new at this dyno stuff now would a 10% load effect the HP reading as in lower or would it be what it is. |
Cowboytutt
| | Posted on Wednesday, August 04, 2010 - 11:26 pm: |
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Vin, I don't know much about dynos either but there seem to be two general types, inertial and, aw heck, I can't remember now what they told me the other type was today. The inertial types is really only an accelerometer. It measures how fast you accelerate the drum and in that sense it does create a load. But they don't lend themselves to steady-state load very well. The only difference it would or should make is with the air fuel ratio. Vance and Hines indicated to me that while it may appear that my bike was lean on the dyno run, during street use the map probably enrichens the mixture. Also, a good map involves part throttle settings, not just WOT as well as ignition timing. Not sure I answered your question. I'm sure there are those who know a lot more about this than me. -Tutt |
D_adams
| | Posted on Thursday, August 05, 2010 - 01:10 am: |
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quote:I'm new at this dyno stuff now would a 10% load effect the HP reading as in lower or would it be what it is.
Yep, it will read a lower number. |
Cowboytutt
| | Posted on Thursday, August 05, 2010 - 01:20 am: |
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Thanks D. That does make sense. -Tutt |
D_adams
| | Posted on Thursday, August 05, 2010 - 02:19 am: |
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I had the dealer do it once at a 25% load, hp came in under 100 on mine where the baseline was about 123 or so.
Way back when, the dyno I used in school had a manual load brake, the drum was water cooled for over 25 hp runs. We did those little YSR 50's made by Yamaha. Stock I think they only hit maybe 6 or 7 hp, I got 19.5 out of the one I modded. Ported, polished, knife edged the transfer ports, bumped compression and race fuel with bean oil. Ahhh, that was some fun stuff there.
We also had some nice Sun 4 gas analyzers for doing the 4 stroke bikes for tuning. I remember one of the instructors had a "portable" unit he'd carry on the bike for load testing on the run. I never did figure out how he did it and see wtf he was doing while riding the bike and trying to tweak it in. |
Jules
| | Posted on Thursday, August 05, 2010 - 04:52 am: |
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We did those little YSR 50's made by Yamaha.
If you're anything like me then just writing that will have given you some nostalgia pain and you'll soon be on eBay looking for a little old 2-stroke to play with.
It's a slippery slope! |
Vinb
| | Posted on Thursday, August 05, 2010 - 05:45 am: |
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Great thanks for the info. |
Puredrive
| | Posted on Friday, August 06, 2010 - 02:32 pm: |
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Dynojet reading are very universal..That is why I prefer it. SAE factor give a good indication of sea level vs high altitude readings.
Specially if I am just trying to get a figure that it's easy to compare.
Dyno Info..Good read.
http://www.kennebell.net/techinfo/general-info/Dyn oTestVariables.pdf
D_adams I had the dealer do it once at a 25% load, hp came in under 100 on mine where the baseline was about 123 or so.
So what was the purpose on putting a 25% load? Just curious |
Zac4mac
| | Posted on Saturday, August 07, 2010 - 08:58 am: |
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You need to load the dyno to tune at steady-state.
The base-line I got a few months ago had a dozen or so A/F readings at different rpm with a 30% load.
This was the day my E.B.R. ECM arrived and is the baseline with OEM ECM- 062 Cal, K&N and Drummer.
I will get a run with the race ECM a week or two after Sturgis insanity calms down.
Zack |
Rt_performance
| | Posted on Monday, August 09, 2010 - 12:34 pm: |
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I had mine on the Dyno first at Ebr (no print out ) then a local bike show had a dyno jet 20 power pull (hot 90 degrees with not much air flow in the trailer)
max hp 128.19 sae was set 1.05
max speed 163.53 (but my rear tire spit out a nail and went flat before he hit redline)
No tq numbers
But was very close to ebr's conversion to the dyno jet was 132 hp |
Rt_performance
| | Posted on Monday, August 09, 2010 - 12:37 pm: |
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thats a 2009 1125r kn,ebr ecm with the Barker tune and barker slip on |
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