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Old 07-11-2014, 03:19 PM   #121
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Haven't read this entire thread but $425 isn't bad at all for a DYNO tune. It's crazy for a mail order but not DYNO.

I drove 650miles ONE way and paid $450 for my tune for my supercharged 03 5.4L tune.

But to say it's better isn't exactly true. You can datalog everything the tuner can and send him the log and he can make adjustments off that. Which is basically no different than a dyno tune.

Dynos are used to tune cause it safer to do 100+ MPH on the dyno than street! There has been low 10sec Lightnings tuned this way and never been on the rollers once. The tune will only be as good as the datalog.

And honestly street tuning is better if you ask me because dynos only simulate real world conditions. Simulate being the key word. Nothing can simulate real world load, heat, wind drag, temps, etc as well as real world. Dynos are a tuning tool, driving and logging after a dyno tune should be done to make sure everything is were it should be.

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Last edited by Z7What; 07-11-2014 at 03:26 PM.
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Old 07-12-2014, 11:46 AM   #122
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The thing I've always been concerned about is how many of the people who write these tunes are doing their testing a 5000 feet above sea level? Then again if you tune it for this altitude how will it run if you road trip to the coast.
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Old 07-14-2014, 12:13 PM   #123
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I agree with Z7What, actual Road/Track testing is the very best, but I don't have the time/resources of a Race Team so a few DYNO sessions are the best I can do. Haha. I do plan on road testing and tweaking the tune a bit though.


Larsen- Non of the guys doing the computer tunes can fully take the altitude into account. The computers in our trucks are programmed to maintain a certain Air-Fuel-Ratio. Since this is highly dependent on how much OXYGEN the engine is getting NOT how much air, it would be almost impossible to take into account the lower Oxygen percentage of our air with one of these computer tunes.


Once you start adding CAI's and exhausts, the amount of Air and Also oxygen can start to change outside the boundries of the Stock PCMs limits causing codes to trip.


From what I understand you have to essentially "Trick" the MAF sensor at altitude so it thinks its getting less air (less oxygen) than it actually is to account for the lower Oxygen percentage. Ill let you guys know my results!
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Old 07-15-2014, 05:18 AM   #124
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Quote:
Originally Posted by Corylax18 View Post
I agree with Z7What, actual Road/Track testing is the very best, but I don't have the time/resources of a Race Team so a few DYNO sessions are the best I can do. Haha. I do plan on road testing and tweaking the tune a bit though.


Larsen- Non of the guys doing the computer tunes can fully take the altitude into account. The computers in our trucks are programmed to maintain a certain Air-Fuel-Ratio. Since this is highly dependent on how much OXYGEN the engine is getting NOT how much air, it would be almost impossible to take into account the lower Oxygen percentage of our air with one of these computer tunes.


Once you start adding CAI's and exhausts, the amount of Air and Also oxygen can start to change outside the boundries of the Stock PCMs limits causing codes to trip.


From what I understand you have to essentially "Trick" the MAF sensor at altitude so it thinks its getting less air (less oxygen) than it actually is to account for the lower Oxygen percentage. Ill let you guys know my results!
Yeah, keep us posted. I don't mind paying more if it's a better tune, just a little concerned about the system's ability to adapt to lower altitude if it's set up for our thinner air.
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Old 07-15-2014, 05:18 AM
 
 
 
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