| Author |
Message |
    
Dmhines
| | Posted on Tuesday, March 11, 2008 - 09:49 pm: | 
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Just had my bike Dyno'd ... It's a 4 Gas dyno .. can anyone explain to me what's it saying? The Dyno Guy said there are some Lean/Rich issues that he could solve for $250 ..
I sent this chart to Al at American Sport Bike also since I got the Map from him. Any input on what specifically the numbers mean would be helpful. Thanks ...
Also ... according to multiple websites ... the EC997a typically dyno's 15%-20% lower than DynoJet #'s ... supposedly more accurate but who knows.
(Message edited by dmhines on March 11, 2008) |
Blake
| | Posted on Tuesday, March 11, 2008 - 10:49 pm: |
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When you ride the bike, how does it feel? If okay, then keep riding and save your $250. |
Dmhines
| | Posted on Tuesday, March 11, 2008 - 10:52 pm: |
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It feels fine ... however ... butt dyno's can't compare to the real thing ....
I'm waiting to hear back from Al over at American Sport Bike and see what he thinks about it ... |
Blake
| | Posted on Wednesday, March 12, 2008 - 12:21 am: |
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"however"...
Then you are wasting your time. If the bike is running fine, then ride it and enjoy.
If you want to pursue higher performance, then that is okay too, but does not relate to any kind of diagnosis of a well running stock motorcycle. Yes? |
Dmhines
| | Posted on Wednesday, March 12, 2008 - 08:39 am: |
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The bike is not stock I should have mentioned that.. 2006 XB12
K&N / 2007 airbox / D&D Pipes / Breather Tube bypass ..
If the 4-Gas EGA is seeing rich and lean areas ... then I would like to correct it.
I just wanted to know if anyone can tell by the numbers listed above exactly where the rich and lean areas are ...
(Message edited by dmhines on March 12, 2008) |
Bombardier
| | Posted on Wednesday, March 12, 2008 - 09:02 am: |
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The really low CO readings would be the lean areas.
Anything below 2 to 2.5 is running on the lean side as this represents the amount of unburnt fuel.
CO is a result of incomplete combustion so where the readings are a lot higher it tells you that this area is running rich. |
Dmhines
| | Posted on Wednesday, March 12, 2008 - 11:54 am: |
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Thanks ... I suppose that is why the dyno operator put Lean Cruise since below 2500 it is running lean. However ... Optimal Cruise on a Buell is between 3K to 4K.
This guy told me he never tuned a Buell but his partner does tune H-D's ..
I'm wondering if the low RPM is lean to prevent Spark Plug fouling. Still waiting to hear back from Al at American Sport Bike. |
Jackbequick
| | Posted on Wednesday, March 12, 2008 - 05:52 pm: |
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Low RPM lean is probably got to do with there being more interest in meeting emission standards than there is in smooth throttle transitions, low speed performance, and happy owners.
That is where all the tubers with CV-40 carbs attained happiess by changing from a #45 to a #48 low speed jet, removing the cover from the mixture adjusting screw, and setting it to 2-1/2 turns.
I don't know if you have a similar level of control over the fuel/air ratios on the EFI or not. I'm still happy with the CV-40.
Jack |
Bombardier
| | Posted on Wednesday, March 12, 2008 - 10:47 pm: |
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Absolutely.
To make the low rpm areas richer you dial in a bigger number.
The numbers in the fuel chart represent milliseconds of injector opening time.
The more milliseconds the more fuel. |
Jackbequick
| | Posted on Thursday, March 13, 2008 - 07:05 pm: |
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Thanks,Bombardier.
Now all they have to do is add a TPS reset button to the EFI equipped Dynas, and I'll consider buying a newer one.
Jack |
Mnbueller
| | Posted on Tuesday, March 18, 2008 - 08:45 am: |
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Just thought I would add this little bit of info. The numbers are based on a car, liquid cooled. i'm not sure if it would differ from an air cooled motorcycle. but:
CO to AFR (air fuel ratio)
%
0.0......14.7 (perfect combustion)
1.0......14.1
2.0......13.7
3.0......13.4 (optimum power modern engine)
4.0......13.0
5.0......12.6 (optimum power older engine)
6.0......12.3
7.0......11.9
8.0......11.5
9.0......11.2
10.......10.8
To determin AFR #'s higher than 14.7 which would be considered lean, need to be figured on O2 and HC emmissions.
My background and education is in automotive engineering and drag racing. It seems your 1500 to 2500 RPM AFR is good. 3000+ does seem rich, but this where I don't know what optimum for an air cooled V-twin is. Hope this info helps you understand it better though.
(Message edited by mnbueller on March 18, 2008) |
Mnbueller
| | Posted on Tuesday, March 18, 2008 - 08:49 am: |
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Dyno information:
Eddy current dyno's do give more 'acurate' hp and torque numbers. if you are looking for bragging rights you should dyno your bike on a dynojet.
In all reality it doesn't matter what dyno you use, as long as you always use the same dyno to compare gains/losses from mod changes.
The only real test to a bikes or cars performance is on the track. 1/4 mile time or lap time. You can have all the power in the world, but if you can't get it to the ground or know how to handle it you will still come in last. |
Bombardier
| | Posted on Wednesday, March 19, 2008 - 12:11 am: |
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There is a company in the US who produce an O2 gauge that can be mounted on the handlebars of your bike to give you realtime readings of your mixture.
www.rbracing-rsr.com
They seem to have a lot of knowledge on harley and other types of motorcycles. |
Blake
| | Posted on Wednesday, March 19, 2008 - 05:28 pm: |
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"Eddy current dyno's do give more 'acurate' hp and torque numbers."
That is not necessarilly true. Both brake and inertial type dynos are accurate for what they are measuring. The intervening calculations are more likely to bias the reported results as is the variation in rigor with which dyno operator(s) seeks to maintain high standards of repeatability in his efforts.
"The only real test to a bike's or car's performance is on the track. 1/4 mile time or lap time. "
Unless you are trying to win a dyno shootout competition. ;) |
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XB12 on a EC997A Eddy Current Dyno - tell me what it means