Dyno necessary Stage 1?
The dealer is offering a SERT and full dyno tune for $700 plus tax so I dropped the bike off this afternoon.
IMO, if you can afford it, you should have it professionally tuned. Face it you won't be satisfied until you do.
hth,
Dave
PS. I'll provide some feedback once I get the bike back tomorrow or Thursday.
Last edited by EastSideBikerTrash; Jan 19, 2010 at 06:51 PM. Reason: spelling
Cooler, smoother and more power sound like something a fuel company would put on a gas pump to encourage you to buy their fuel. There is nothing in any of those words that mean anything at all.
Anyone who has had their stage 1 dynoed wants / needs to beleive that they didnt waste their money, so psychologically they are biased and can not be relied upon.
Look at the science. Minor changes in AFR and timing result in minor changes in tq, and when the tq produced is minor (eg stage 1) then the overall impact is negligible.
Cooler, smoother and more power sound like something a fuel company would put on a gas pump to encourage you to buy their fuel. There is nothing in any of those words that mean anything at all.
Anyone who has had their stage 1 dynoed wants / needs to beleive that they didnt waste their money, so psychologically they are biased and can not be relied upon.
Look at the science. Minor changes in AFR and timing result in minor changes in tq, and when the tq produced is minor (eg stage 1) then the overall impact is negligible.

That's the difference between the dealer download and the dyno tune. What the chart doesn't show is how much better and cooler the bike ran. The difference at 3500rpm was substantial, as you can see.
Edited to add- And before anyone starts whining about the different components, the fact of the matter is that the bike made far more power after the tune, and ran far, far smoother and cooler. Tell me I'm psychologically biased, and I'll tell you you don't have a clue how well your bike could run if you'd crack open your wallet for a tune.
Last edited by '05Train; Jan 19, 2010 at 08:23 PM.
Edited to add- And before anyone starts whining about the different components, the fact of the matter is that the bike made far more power after the tune, and ran far, far smoother and cooler. Tell me I'm psychologically biased, and I'll tell you you don't have a clue how well your bike could run if you'd crack open your wallet for a tune.
You changed components. This proves nothing. The fact that the AFR charts are missing further raises suspicions.
BTW my bike has been dynoed by 1 guy and it made a huge difference. But my bike is like Stage 8 or whatever in Stealin Eagle wankspeak. My canned map was for a bike running a S&S teardrop air cleaner and staggered shorties. I always knew a dyno would be necessary for my engine running the HB and power duals.
My point is that if you have a canned map for a stage 1 96 with a heavy breather and monster ovals (for example) and your bike has a HB and MOs then you aint gonna change the earth by dynoing and you would be better off saving the dyno money and putting it towards cams, beer or *****. Fact.
Just an option.
I could get behind saving money for beer & *****
The Best of Harley-Davidson for Lifelong Riders
You changed components. This proves nothing. The fact that the AFR charts are missing further raises suspicions.
BTW my bike has been dynoed by 1 guy and it made a huge difference. But my bike is like Stage 8 or whatever in Stealin Eagle wankspeak. My canned map was for a bike running a S&S teardrop air cleaner and staggered shorties. I always knew a dyno would be necessary for my engine running the HB and power duals.
My point is that if you have a canned map for a stage 1 96 with a heavy breather and monster ovals (for example) and your bike has a HB and MOs then you aint gonna change the earth by dynoing and you would be better off saving the dyno money and putting it towards cams, beer or *****. Fact.
Anyone who's had a bike dynoed by a competent tuner can testify that the tune makes the bike run cooler and smoother. Oftentimes there's a substantial power gain below the peaks. If all you care about are peak numbers, then a tune (at Stage 1) isn't going to make a huge difference. If you care about how your bike runs, and about getting everything out of the components you've paid for, then a tune is worth every penny.



