Just because the car ran fine when it left the shop doesn't mean the tune isn't bad, example:

Buddy of mine has a duel MAP on his VIIIwith both 93 oct and E-85. The car ran like a champ for about 3 weeks and then. . .the 93 MAP started to go haywire. . .so ignoring the issue he switched back to the E-85 MAP and continued to drive. A couple days later he started having AFR issues (the same issue plaguing his 93 oct)...we had a hard time trying to zero in as we looked at the MAF (ensured proper scaling and proper function)
F/R tables (all seemed okay)
among several other things and finally....after letting it bum us out for about a week and a half I told him that it has to be the injectors, even though they were brand new...along with the pump...

Long story short, his injectors wern't scaled correctly and his latencies were off...big time!

So in conclusion...if the tune is bad...it will arise at some point in time, just not always right away.

 

I'm very sorry to hear of your issues, but I've got a few qualms with your statements. First and foremost, your "buddy" is absolutely incorrect about fuel pressure and failing fuel pumps. When a fuel pump is failing idle is typically not affected, rather fuel pressures drop off while in boost which is why we wanted to monitor your fuel pressure on the dyno. Second, this is not our first rodeo. To insinuate that we do not know how to properly scale fuel injectors on a platform that we specialize in is just silly. Modifying vehicles from their factory state can lead to issues, and sometimes the root cause of such issues is very hard to determine without spending a significant amount of time troubleshooting. My service writer advised you that any issues with that tune would be resolved free of charge as we stand behind our work. Any mechanical issues that are unrelated to the work that we performed would be charged at our normal labor rates. Are these stipulations unfair or out of line in some way?

Ultimately, I would love to help you resolve these problems and get you safely back on the road and enjoying your car. My stipulation in doing that, however, would be the need for you to trust us. If you honestly think of my tuner as an idiot that doesn't know how to properly scale fuel injectors than perhaps it would be best for both parties to go our separate ways.

 

As a disinterested outsider, no, those conditions are not out of line. They are completely reasonable.

To the thread-starter: I don't know of any shop near you that is better and more committed to long-term presence (and, therefore, happy customers) than MAP. I urge you to trust them.

 

What everyone else is saying. MAP is very a reputable tuner/parts. If it was some local unnamed shop then I am sure a lot more people would suggest going to a more reputable tuner. I am not ruling out that there could be an issue with the tune but if MAP is saying it is most likely something else I would trust them. It is your car though so you have the end choice.

 

What sensor are you referring to? They drained the tank and filled it with e85.

 

I haven't checked it yet.

 

The map is locked, I wish I could look at the scaling.

It is a dual map. I just have to hold down the cruise on/off switch for a couple seconds to switch.

 

The 91 oct map is made just to get by not for performance. The car runs way different on the 91oct map.

 

Well I never said that the tuner is an idiot, he seems knowledgeable. But when I went in to get my tune touched up he had no interest to look into the tune as being the cause of my problems. I just felt like they were quick to dismiss a tune issue and solely rely on the fact that it has to be a mechanical issue. If it is a bad fuel pump or injectors, I'm not sure what that has to do with the MAF scaling. I would like to know why the MAF sensor maxes out at 255 g/s and 4.4 volts by 4000 rpm and stays there all the way to red line.
I bought a lot of parts from MAP and took my car to get tuned there so I do trust you, I just want to get this issue resolved and if I can do the work myself to save money I'd like to. I just want to confirm that it's not a tune issue so I can narrow the problem down.

 

i am referring to oxygen sensor (or lambda sensor). May have damaged from poor fuel quality.

 

Please shoot me an email and i would be happy to run the MAF sensor issues by my tuner to get his thoughts for you.

 

right but if you're on the 91 map slot with a tank full of e85, it will run weird. Have you disconnected the battery or anything like that when it started to run odd on you? I've seen them default back to the base map slot after the battery is disconnected.

 

Jon use the multi quote option lol.Map performance seems like stand up guys and are willing to look into it for you jon I would take them up on the offer.I buy parts from them they are straight shooters.

 

Oh, I will do some research.

email sent

I've tried the 91oct map and the car won't even idle. It almost dies.

 

Agreed with the statements from everyone regarding MAP. They sent me an upgraded turbo about 2 years ago for my evo 8. I started having issues and they said they would take care of me. I shipped it back, they tore it apart and basically rebuilt the thing free of charge. It ended up there were no issued with the turbo itself, the wastegate was not properly adjusted (which is not their problem).

They even shipped it back to me overnight as I told them the car was my DD.

Trust them! =)