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Discussion Starter #1
There are about four threads covering the issues people are having with the unit. This is the auto tune unit. From here on out it would be good if we can post all under one thread to see if and when someone finds a solution.


Here's my situation:

I am running the V&H twin slash staggered and LA Choppers XXX air kit. I am having issues with chugging at 20 mph in first and 33 mph in second. I've checked for air leaks on the exhaust and throttle body and didn't find any. I am now waiting on a new unit from Cobra.
 

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Midlife, I have the same issue with the stock air cleaner, stock fuel management, and V&H staggered pipes. 25mph in 1st gear and 35mph in second gear, the engine leans out unless I am accelerating through those zones. Otherwise the bike runs great. I have been following all these threads and the common issue seems to be the V&H pipes.
 

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Could be but the auto tune is supposed to work out any issues you might have and provide optimum performance with any mods so I think it's a bad unit
 

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I am also having the same issue with the chugging. I can even hear and feel it skip once in a while around 55-60 mph.

Cobra pipes and a Hypercharger intake

I talked with Phil at Cobra a while ago about this. He ended up sending me a new unit... needless to say it didn't help it at all.
 

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It's funny... prior to about 3 weeks ago... all you heard was how good these cobra autotuners were... I think lots of people said how good they were BEFORE they actually purchased one... All the good comments is why I bought one. Now I am concerned that when I get home, I will have to shell out a bunch of cash for the Power commander V!!! To say the least I am concerned!
 

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SFCMcGan said:
It's funny... prior to about 3 weeks ago... all you heard was how good these cobra autotuners were... I think lots of people said how good they were BEFORE they actually purchased one... All the good comments is why I bought one. Now I am concerned that when I get home, I will have to shell out a bunch of cash for the Power commander V!!! To say the least I am concerned!
well, with anything i'm sure there can be problems, i have less than 500 miles on mine so far but i also love it so far if that makes sense. I was having most of these issues prior to adding it and they're all gone now. No chugging, more power, taller gears, better gas mileage, really feels like a muscle cruiser now. I am running unleaded plus, that could always be part of the problem, who knows. Sure hope you guys come out ok with this. I know it can be very frustrating.
 

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Curious.............the chugging at low speeds seems like a service problem the dealer "should" investigate. Has anyone approached the dealer techs about this problem?
I don't seem to remember this problem on my scoot. If it wasn't raining I'd go out and do some low speed rides.
 

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Discussion Starter #8
Curious.............the chugging at low speeds seems like a service problem the dealer "should" investigate. Has anyone approached the dealer techs about this problem?
This is my next step if the new unit does not correct the issue.
 

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I have the same problems with chugging and skipping . i called cobra and informed them about there are a few people that have problems with the tuner and asked him to register here and address some of this .
 

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Went for a ride today, and all speeds below 20 mph in first gear the bike chugged. Not all that sure it's not a normal problem.
 

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Discussion Starter #13
Nothing definitive. Just wants to find a solution. We discussed it may have to do with a manufacturing defect and not Cobra. Didn't take this as him looking for an excuse. Just trying to rule out everything.
 

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I took mine out for a ride this evening and found a parking lot to do some low speed tests, no chugging whatsoever, I think it is a manufacturing issue, mine just purrs like a kitten till I make it roar
 

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StrykenShane said:
I took mine out for a ride this evening and found a parking lot to do some low speed tests, no chugging whatsoever, I think it is a manufacturing issue, mine just purrs like a kitten till I make it roar
I did that back in the summer and had the same results.
 

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Discussion Starter #17
Just spoke to Phil and we discussed a couple other variables. We discussed the difference fuel octane may have in this situation. Phil believes you should always run premium in motorcycles and may have something to do with the chugging. I shared a synopsis of the discussion on this forum about fuel and it was his opinion that the higher octane may not improve your performance but its more about maintaining performance. He indicated this is exacerbated when you start adding aftermarket performance parts.

On a different note, he said Cobra is in the process of ordering different aftermarket pipes and big air intakes to run on the dyno with the Stryker to figure out our problems. He said they plan to run multiple combinations to see how the Powerpro responds to different set ups.
 

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Just my 2 cents... Octane measurements pertain to decreased sensitivity to pre-ignition of the fuel... the higher the octane the more compression an engine can have before detonation occurs. It in no way increases fuel economy or enhances horsepower in "stock" engines. That being said... the STRYKER has 9.5:1 compression... well within the 85 octane range... the recommended rating is 89 octane... I have put several tank of each grade of gas through my STRYKER and have found almost no difference in performance between the octane ratings... I have found huge performance differences in fuel companies... I have had the best performance using Shell fuel....if Phil from Cobra is using the Premium octane theory to support any flaws of the autotuner... I am concerned.

I know there will be people out there that will debunk what I have said... but it is true... Octane does not enhance performance in low compression engines.

Read this:

http://www.ftc.gov/bcp/edu/pubs/consumer/autos/aut12.shtm
 

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I buy 99% of my gas from my local Chevron. I saw the thread about using mid-grade fuel before and tried it, my fuel economy immediately went from 38.9 to 40.8, after auto-tune it is 44+ thru 3 tanks. But I still feel there must be a bad batch of the auto-tuners out there, mine works as it is supposed to.
 

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StrykenShane said:
I took mine out for a ride this evening and found a parking lot to do some low speed tests, no chugging whatsoever, I think it is a manufacturing issue, mine just purrs like a kitten till I make it roar
Im with Shane- No problems with the auto tuner, fixed all my previous problems. Stick with low octane 86-87 and I also have the o2 sensor resistor installed! The things is awesome at all speeds.
 
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