2 bar E38 issues

[XLR8NSS]

It's supposed to rain tomorrow pretty hard most of the day so it'll probably be Sunday before I try this. I'll let you know D

[XLR8NSS]

Truck won't even stay started without the MAF hooked up. Here is a log where I tried starting it a few times. It runs for a second or two and then dies.

[MN C5]

We switched to IMac's at home hopefully 7.54 will work well with windows running as boot camp. I've very interested to see whats going on..

[Highlander]

Do you have the part number for the map sensor 2 bar?

Than ks

[arubenstein]

Ok, I recently installed a magnacharger on my '07 GMC Sierra. I installed a 2 bar MAP sensor and properly scaled it in the computer. I also used the 2 bar Virtual VE(VVE) to update the coefficients. The MAF was also left installed.

Just curious --- I recently put a MagnaCharger in a 08 Sub with a L76. Running a 1 bar MAP and the Magna tune, things are running pretty well (scanning reveals over 500 ft-lbs of torque).

Any reason why you want to run the 2 bar MAP? Do you think the Magna tune is no good?

Also, did you end up putting in the MagnaVolt?

[XLR8NSS]

Nah, I just wanted to use the 2 bar map sensor as a "boost gauge". I did not realize that 2 bar and MAF don't get along for some reason.

The Magnacharger 1 bar tune is working just fine now.

I have the magnavolt sitting here but, have not installed it. It'll be installed this weekend probably because I want to get some tuning time in before a track meet on the 16th.

[arubenstein]

I have beed doing dome research on the need for the magnavolt.

As you may be aware, EFILive scanning has the ability to tell you what the Fuel Rail Pressure is. I have been logging that vs. grams/cylinder, and I have found that even under the heaviest loads with PE kicking in, fuel pressure is A-OK and the O2 sensors indicate that things are running rich.

There is further thoery that even if you use the MagnaVolt on vehicles with the FSCM, the FCSM regulates the voltage the fuel pump anyway.

YMMV, but I don't think I will be putting mine in.

Which charger did you get? I had a fitment problem in my 08, so I ended up changing to a more recent version.

I can post some pics if interested.

[Highlander]

why is the 2 bar map not compatible with maf?

[Highlander]

Can anyone confirm 213-796 as a 2bar map sensor?

[XLR8NSS]

why is the 2 bar map not compatible with maf?

DC_Justin explained what was happening with my setup in post #5.