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[Hawgrider]

Bike went into the local dealer on Thursday morning and picked it up Saturday at noon.
They checked the bike over and found no glaring problem.
They took it for a test ride and it preformed just as I told them.
Put it on the dyno and started to tune it.
After being tuned in 2011 torque was 101.46, base line was now 90.34. After tune in 2011 power was 86.19, base line was now 80.45. Major drop in both.
New tune is power 90.76 and torque 106.01.
Only thing done other than re-tune was cleaning out the intake system.
Tech took bike home on Friday night and did a real world test out on the highway test and was happy with it.
I took it out yesterday afternoon and it preformed great.
BFF and I had it out for a few hours last night and again it preformed great.
Shop has a new dyno and the tech who worked on it is a perfectionist, every thing has to be just perfect. The kind of guy you want working on your bike.

[Hawgrider]

Tune from 2011

[Sklywag]

Sounds like you have it corrected now but on a side note, what plugs are you running?

I have found 5 different bikes now that do not like the SE Platinum plugs.  Put in the SE plugs, they ping, put in the standard plug and they run perfect, never a ping.  Could the ping with the SE plugs be tuned out?  Maybe, but all 5 of these bikes had great tunes by respected tuners on this site.

[lilcoot]

Hawgrider

It's good to hear that you have a tech that knows his stuff.  Priceless!  

Now I have a question for the technical folks (Steve Cole, are you out there?).


"Put it on the dyno and started to tune it.
After being tuned in 2011 torque was 101.46, base line was now 90.34. After tune in 2011 power was 86.19, base line was now 80.45. Major drop in both.
New tune is power 90.76 and torque 106.01.
Only thing done other than re-tune was cleaning out the intake system."


Assuming a bike is broken-in before it's tuned, what would cause a drop in performance like this?  Assuming conditions don't change drastically, do dynotunes "deteriorate"?  What Hawgrider describes sounds similar to what my bike has been doing since it was tuned.

[Buckeye_Tuning]

The tunes, them selves, don't deteriorate.  Especially when on the dyno both times.  (pesky AFVs would have been zeroed out for the runs).

How many miles, between runs?
and... Tsani's questions...  (good questions BTW)
Same dyno?
Same operator?

The miles ARE important, as when ring seal, etc start losing its effectiveness, the power will drop some.  2-3000 miles difference, one shouldn't see this.  15-20,000 yes, it can happen.

If you have BOTH sheets, the run conditions can tell the story.  Was one run at 1.01 or .99 SAE correction factor?  Then the next run at like a 1.04 factor?  Makes a difference.

Think of it this way.  You have WORD on your PC.  And the PC has been running well for five years.  Do word documents change themselves in that amount of time?  No?  Same with the tune, for the most part, and the parts that WILL change (meant to do so) will be set back to ZERO if another dyno run is made.

[Hawgrider]

15,000 miles between tunes.
Same type of fuel used, Shell Premium gas with no 0% Ethanol. Biggest change as far as fuel goes is the price, but lets no get started on that.
First tune was done in mid winter, second tune in late spring so there is likely a big change is conditions.
Different dyno, this one has all the bells and whistles.
Don't know about the first operator but the second tuner is building quite a reputation tuning bikes others have been unable too.

The tune itself is just a simple computer program made of 0's and 1's and will not change over time. The work the tech did on the intake system was the first and major part of the fix, then his talent working with the dyno finished it off.

BFF and I had it out this afternoon and performance was great.

[Steve Cole]

Different dyno, this one has all the bells and whistles.

That in and of itself is the biggest reason for different readings. The dyno is a tool and it will show you up is up and down is down but if you try and believe the numbers you will get disappointed time and time again.

[Buckeye_Tuning]

Yup, different dyno cinches it.