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Discussion Starter · #1 ·
I installed my Arrington supercharger kit with the Magnuson supercharger with Cervinis shaker kit and I am impressed with the power but I live in Colorado and I am having major issues with coming down out of altitude. Going up it operates just fine if I drop as little as 1000 feet the car looses power and wont turn over 3000 rpm major loss of power, stumbles and back fires. I have discovered that shutting it off and restarting it wont cure it, removing the battery terminals + &- and re attaching wont cure it I must disconnect the battery for 45 minutes then it works great until I drop again in altitude. This occurs every time and it doesn't matter what altitude I start from. Arrington has been supportive and says they are working on it but I am losing faith. Has anyone experienced this? Arrington stated I am not the only one in Colorado with this issue.
 

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I haven't had any issues with my '09 SRT with a Stage II ProCharger. I live in Aurora and using the same tune I used when in Germany. However, I haven't gone WOT.

Did you install high-flow cats or mess with your O2 sensors? I assume you're in closed loop when experiencing this issue and not rev'ing the motor in a lower gear? Sounds like the PCM is not getting feedback from the O2 sensors. I would also check your MAP sensor.
 

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Discussion Starter · #3 ·
I have not changed anything with the car except the Magnuson, fuel pump, engine control module and the crank sensor. These were all part of the kit. The rest of the car is stock. Its not setting the check engine light but next time ill have my code checker with me and check it anyway. All the connectors seem tight but ill reseat them tonight. I cant rev the engine in this mode as it wont rev past 3K with out losing power and 4k is out of the question. It only occurs dropping in altitude not going up. Brighton to Sterling it acted up Sterling to Denver it was OK. This is only 1300 feet.
 

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thats a little strange, we routinelly go up to Grandfather Mountain and Chimney Rock in NC, both in the 4 to 5k feet elevation, i live in Mountain View which is at 900 feet elevation and have not experience any issues with altitude, on new install we normally drive the cars to Black Mountain during our roadtest, not sure what elevation, but have never had an issue, at least a thousand feet climb and drop
Luke
 

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Discussion Starter · #5 ·
I can duplicate this that's why it frustrating. Runs great when this is not happening. The only common denominator has been dropping in altitude. Thoughts?
 

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I forgot you had to change out the PCM with the '13 since they couldn't modify the tune due to encryption. I thought you had to change out the harness also?

I'm with SRT8Tech, in that it sounds like the PCM is keeping static data and not using the adaptive data. Have you tried to disconnet the battery for 45 minutes at the altitude you're having issues at and then drive around at that altitude? If it runs OK at that altitude but has issues when you descend, then I would say your PCM is not making adjustments to the adaptive data it's receiving (or not receiving).

Also, do you have an wideband sensor installed to measure AFR? If so, what are the AFR readings at the different altitudes?
 

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Discussion Starter · #8 ·
I can reset the computer by disconnecting the battery for 45 minutes and it runs "normal" at any altitude. Then when i drop it does it again. Even as little as 1300 feet. In Colorado this happens quite often. So you are on to something with the adaptive not functioning. All the sensors and harness are stock except the crank sensor. If Arrington's tuner gets back with me ill bring this up. My return calls are not coming as often as i would like.
 

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Yeah, some of the adaptives being turned off is a long shot but its possible. Possibly a bad MAP sensor as well but this sounds weird.
 

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Discussion Starter · #11 ·
Left another message at Arrington....................
 

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Discussion Starter · #12 ·
Left another message with Arrington. This is getting old!!!
 

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Discussion Starter · #13 ·
Finally got a call back From Pete the VP of Arrington I explained the situation as well as the comments here lets see what happens.
 

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change the map sensor......also when it acting up, cycle key and then do wot with it, that should force a recalibration of the baro
Luke
 

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Discussion Starter · #15 ·
Luke,

Ill give that a shot with the MAP sensor. It wont go WOT when this is acting up it plain wont go past 4k even with it to the floor. It runs OK not great up to 3K.
 

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make sure its a 2 bar, when you wot the pedal it should force the baro to reset, our guess is the map is bad and not changing, the reason why it resets after an extended battery disconnect, sorry, never encountered this issue before, i routinely drive up to Grandfather or Chimney Rock, approx 5k+ feet elevation, my home is at 900 feet and have never experience any issues, we also roadtest new supercharger install up to Black Mountain, not sure what the elevation is, except that my ears plug up for about 5 minutes....lol
Luke
 

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Discussion Starter · #17 ·
Luke,

Is the best place to get one of these at the Dealer?
 

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Discussion Starter · #19 ·
Arrington requested my original stock PCM back for a reprogram and said that they have learned a lot since I got the new 2012 one from Arrington. I will install the original reprogramed PCM with the original crank sensor as soon as I get it back and see what happens.
 
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Discussion Starter · #20 ·
Might be fixed

I sent the original 2013 PCM in for a new program. I installed the 2013 crank position sensor with the 2013 PCM Sunday. I warmed it up and then took her out for a spin. Holy cow this is a totally new car. The 2012 PCM with the supercharger definitely made it faster than stock. This 2013 PCM tune tune is EXPLOSIVE. Much more power and a definite sound from supercharger. Unfortunately weather came in so I couldn't test the altitude problem. Arrington assured me that they have learned a lot since I purchased the kit. The Crazy 8 is loaded in the enclosed trailer behind the motorhome for a 11 day trip to South Dakota's Cool Deadwood Nites. I will test the altitude issue there. Thanks everyone with there help and suggestions!
 
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