please interpret my dyno chart : V-Twin Forum: Harley Davidson Forums

thecatkicker · 06-11-2005, 12:02 PM

I started with a stock '05 Deluxe and added a Python staggered exhaust myself.

I then took it and had the dealer install the SE A/C and a PCIIIusb and do a custom map (no stage 1 flash)

This is the chart of what the dyno was before and after.

chart

Why was there no real improvement made?

Also, If I am cruising at 50-55 mph in 5th gear and hit WOT to pass, it is as if nothing happens. The sound gets real deep but no real accelleration for several seconds and then only slowly. Is there anything I can do to improve this?

Also here is the map they made

deluxe.djm

csoday · 06-12-2005, 12:58 AM

Something is strange about your A/F before and after. I've never seen a stock A/F that rich, especialy after a Stage 1 with no flash. It looks like all he did was lean it out.

thecatkicker · 06-12-2005, 06:14 PM

Is it ok the way it is now?

Vetteman · 06-12-2005, 06:23 PM

Take your bike back to the Dyno Shop and have them make it right for you. They want your business and want you to be happy.

Frank

thecatkicker · 06-12-2005, 11:09 PM

What exactly do they need to fix?

Road Bag · 06-13-2005, 01:27 AM

Hi Mr cat booter. I have some good news and some bad news. Your peak HP numbers are pretty normal. Your torque is a bit weak and peaks late. Peak torque on stockers (pipes+AC) is usualy about 74-76ft around 3600 to 3800 RPM, same as a Briggs and Stratton. I think your a bit lean in the mid range for best torque numbers. Your pipes may not be part of the best tune up either? As far as the 5th gear roll on goes, thats all you get with 70 ft pounds of torque. Downshift or spend more money.But your tune ups not terrible, just a touch lean. Ride the crap out of it!

thecatkicker · 06-13-2005, 04:41 AM

Thanks Road Bag.

Anything I can do to the PC map to fix the midrange problem?

Road Bag · 06-13-2005, 07:23 PM

With your PC3 you have the ability to adjust your AF everywhere. I'm not sure I would describe your AF line as a problem, your still, as a wiseman said, "in the box". Remember also, this AF line is from one cylinder at one throttle position. You have 99 other throttle positions and another half of an engine to consider. With out a wide band 02 sensor I'm not so sure I would go shootin in the dark to extensively. But if you just have to, find out wich cylinder was probed and add 10% from 2-3000 RPM and 5% from 35-4000 at 100% TP. If your tuning itch continues. Go to www.tuneyourengine.com and buy an LM1. Your friends and family won't see you for about a month, but you will be able to dial your EFI in perfectly.
RB

thecatkicker · 06-14-2005, 03:38 PM

ok,

how do I add 10%?

Sorry, I am PCIII illiterate

StryderKC · 06-14-2005, 05:24 PM

I'm not going to blow smoke up your ass man, those numbers suck. The mapping they did made it worse, at least in regards to a flat mixture. It's way too lean at some parts and on others it's only marginally safe. The point at 3500 RPM is the only good spot. You paid for it, it sucks, bring it back and have them do it right. You should not have to tell them what to do, nor should you have to figure out how to tune it if you paid for a map.

By way of reference, my '03 FLHPi with SE AC and Wild Pigs did 70/80 roughly.

Lucifer Hammer · 06-15-2005, 11:08 PM

The dyno tech should recheck all partial throttle mapping, and fix the a/f at wot to 13.4/1 it should improve hp/tq. How many hours were you charged for your map? Sometimes it takes a while and can get spendy to get it near perfect, but it can be done!!!

StryderKC · 06-16-2005, 08:11 AM

Quote:

Originally Posted by Lucifer Hammer

Sometimes it takes a while and can get spendy to get it near perfect, but it can be done!!!

No, a guy that knows what he's doing should be able to do this in no time. As a matter of fact, the DynoJet dynos have software to develop a map damn near automatically.

Vetteman · 06-16-2005, 12:51 PM

Guys,

I'm glad you see things as I do on this. I would'nt let this bike roll out of my shop for a customer with my name on it. period. dot. com!

Frank

thecatkicker · 06-16-2005, 02:42 PM

Here is the response from Dynojet:

The air/fuel graph could be better, but it won't hurt anything. You want it between 13 and 13.5:1, and yours fluctuates a little and is as high as about 14.2. It won't make best power at 14.2:1, but it certainly won't hurt it.

From the chart, it is apparent you have significant gains in the peak area. I'm not seeing the flat spot, the whole chart is WOT, as dyno runs are done at full throttle. In the high revs, the bike is much better than before as it was too rich.

Thanks,

Technical and Race Support
Dynojet Research
www.dynojet.com
800-992-4993

I have yet to hear back from the service department at the shop that did the work.

Road Bag · 06-18-2005, 02:49 PM

I have seen tune ups way worse than yours that people paid for. If you paid good money for a custom map, I have to aggree with the rest, you did not get your moneys worth. I still don't think your tune up is terrible. Just not as good as it could be.
RB