For me, the two go hand in hand. I currently have a Cobb custom tune, but lately I've had problems with them so I'm contemplating an open-source tune. My only holdback is the number difference between the two dynos. How much higher does a Dynojet typically run? What are the pros and cons of an open-source? Thanks for the help.

 

Dyno Jet tends to read about 12-15% higher than a mustang dyno. As far as the tune I would get an AP because its just a good thing to have its very user friendly and easy to use. You can have a few different tunes on the AP lets say 1 for 93 octane gas and 1 for E85 and change them on the fly. Its an overall easy thing to use and you can read ecu codes and in my opinion its a great tool. Hope this helped.

 

~15% as stated above. Difficult to make a direct comparison among dynos unless the power difference due to mods is ~10% or greater. Temperature and humidity also have a significant impact on the read on a given day. I suggest you baseline with VD as well, and use it to compare after mods/tune under very close road and atmospheric conditions. It will give you one more data point.

 

Personally I think the AP is a waste of money, when the money you spend on that could be used for a real tune. So open source all day long for me. Not only that with COBB, you're limited to what mods you can do and to COBB products...which I don't like.

 

What problems are you having? Have you gone in to Cobb - Plano to discuss it with then and find a resolution? Calvin up there is a very good Evo X tuner and I've been impressed with his work on my car. My power and reliability speaks for itself in my book.

The actual process of getting a custom tune with the AccessPort or ECUFlash is nearly identical; any differences will really come down to the quality and proficiency of the tuner himself.

 

Limited on mods? Where did you get this information?

 

Misunderstood the thread, thought he was talking about using the AP only.