Need advice on a TT408 tune problem..

[Redline Motorsports]

I think I may be on to something.............I believe that the car has a stock 1 bar MAP. If so; if we where to max it out, would it cause the symptoms as noted? Also if we replace it with a true 2 BAR, how do you properly configure the software to read it?

The guy has the car back and is confirming the MAP that's in the car.

[MN C5]

I think I may be on to something.............I believe that the car has a stock 1 bar MAP. If so; if we where to max it out, would it cause the symptoms as noted? Also if we replace it with a true 2 BAR, how do you properly configure the software to read it?

The guy has the car back and is confirming the MAP that's in the car.

I used a GM 2Bar MAP part #213-1631 AC Delco #12580698 GM# snapped right in and it fired right up with the first tune I tried. Basically you'll have to establish 1/2 values for tables using MAP. It only takes 30 minutes or so to get a base tune setup for the 2bar. Then using Auto Tune it won't take long to wrap it up.

[Redline Motorsports]

I just spoke to the guy that owns the car and he has confirmed that the MAP in the car is a stock 1 BAR that came with the LS2 intake. Good news a guess.

Once we installed a 2 BAR is there any parameters that need to be changed to let the PCM know that it has a MAP with twice the range? Or, according to the way you stated "establish 1/2 values" do I just look at the existing header and assume it is half?

Does it sound logical to say that since we now know that the MAP was being maxed that this was a large tuning issue and was causing this scenerio?

The other question I asked was about the FS dashboard; I noticed duing loggings on the dyno that the MAP would read 105 (which I believe is the max MAP reading out of a stock MAP sensor) will this read a higher KPA with the new 2 BAR MAP sensor?