Dyno Tunning

[TonyM995]

That would be nice. Just talked to the shop. They have to call Dynojet on Wednesday and talk to one of their engineers. Everything has been eliminated short of a tuner issue or possibly the ECM.

This is where data logging of a standalone is superior to a stock ecu. I’d be checking all of the critical sensors to see what signals they are sending vs what the ecu would expect to receive. No way would I agree to pay for a new ecu unless I could determine that the issue isn’t a critical sensor or the wiring to that sensor.

Critical sensors are things like MAF or MAP (not sure what your bike has), cam/crank sync sensors, TPS (adds fuel upon rapid throttle opening), and the O2 sensor (probably the dynojet sniffer).

A dyno tune on a stock ecu generally has two compensation tables- fuel and ignition. So what are they seeing with the dip? Spike or drop in AFR? Is the timing going out of whack?

I’m not sure what’s happening but I’d always go back to basics. If they think the dyno or dyno O2 sensor is a problem it’s easy to strap a different bike on and see if there is an issue or not.

If you didn’t have this issue before the upgrades I’d be checking the critical sensors that the ecu uses as inputs to control the outputs (injectors and coils). Maybe a sensor is bad or a connection is bad.

Data logs would be the best way to see exactly what is happening.

 

[TonyM995]

I do like to tinker but not when it leads to 3+ weeks in a shop. What I did should not have caused this issue. I’m almost certain the ecu is bad but they want to explore other avenues before throwing a 400 dollar part at a guess. If this gets sorted soon I’ll be happy with the results. Suspension and audio have all been addressed. My last path was this cam swap. Who knows. Might just get another bike to have when one is down. Was really hopeful to be riding this weekend but that’s the breaks I suppose.

@michael.

I have the powervision tuner with widebands, that’s one of the reasons the shop is reaching out to dyno jet. Bike goes limp at 3100 and wakes back up at 4k. Biggest thing we see is it will not throw codes no matter what you disconnect or do to it. That at least in the car world would point to a bad ecu.

I had never heard of the powervision product. It looks good.

What happens if they unplug and completely disconnect the powervision?

Hopefully they get it sorted out!

 

[shade]

I highly doubt it's an ecu issue.
Bad tune I'm betting

 

[SSGT_B]

I highly doubt it's an ecu issue.
Bad tune I'm betting

I had never heard of the powervision product. It looks good.

What happens if they unplug and completely disconnect the powervision?

Hopefully they get it sorted out!

When I talked to the shop, they have switched out all primary sensors,( map, tps, cps, ) changed my new injectors to see if they could have been bad. Changed plugs and wires. Removed the powervision and hooked up the techno research diagnostic tools. Flashed 3 separate tunes aside from the one I had in it. Turned off sensors to force codes, and there are no codes. They have ran several logs and sent the tunes and logs back to dynojet. This is a well respected shop in the Harley scene down here. Even my dealer sends bikes to them to get tuned. Last two things to get ruled out are the coil and ecu. Unless there is a wire pinched somewhere. I never noticed the issue prior to this as I never have the bike over 3K rpm. All I do is cruise.

 

[shade]

Interesting. A pinched wire should throw voltages off throwing a code.

 

[SSGT_B]

Talked to Bruce at the shop last night. We ranted on about life events for a few minutes then dropped into the bike topic. He is still at a loss however, he said he is now not charging me additional tech time as he has adopted the bike as “challenge accepted” at this point. I expressed I am not is a rush as it will honestly be a few months before I can ride. We talked about the only other possibility’s we can think of that have not been swapped out. Powervision, Target tune and ECU are about it. Hopefully soon we will have some answers. The bike is definitely not typical. Like me, it’s hard headed lol

 

[SSGT_B]

Update:

Spoke with Bruce at the shop a bit ago. He’s swapped out my target tune and put in a non wide band tune, same issue. So we are down to possibly it being the ecu. It makes logical sense as all else has been swapped out. It’s a 50/50 , 500$ crap shoot. Hopefully next week will be good news. If so, I’ll find someone to deliver it here so I can stare at it.

 

[c10]

Where is it located ?

 

[SSGT_B]

Where is it located ?

Hey Brian, how ya been doing? The bike is at J&B Cycles off 249 near 45.

 

[c10]

When its done can give you a hand getting it home .

 

[CallieWilkinso]

It's hard to guess these numbers but I say it will make more than it did and less than your previous bike....

 

[CallieWilkinso]

It's hard to guess these numbers but I say it will make more than it did and less than your previous bike....

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