I know it is a little of topic being a 6cyl. But I noticed my wife's I6 Envoy has no MAF. How the hell does it measure the air intake??

=Dave

 

if it has no maf, then it has a map sensor. it measures the manifold pressure.

 

it must have more than a map sensor taking care of stuff. we have both.

 

I thought they all have map sensors in addition to maf's???

 

We've wired a couple of the I6 engines here. They are set up as speed density fuel control, meaning MAP sensor only; no MAF sensor. I think some of the 4 cylinder GM engines are also this way.

 

Oh ****. That's what dodge uses on 4.7L, 5.9L trucks. Is GM moving backwards with their tecnology?

 

Speed density is a better system for max power. All aftermarket ecm's use them. My accell gen 7 was a breeze to tune with speed density and you can run as much power as you want. You only have to deal with an A/F & V/E map. Simple.

 

Really? Seems the biggest obstacle for a Dodge owner is tuning their trucks. And they all complain that it is because of the speed density sensor setup.

 

lots of guys into big power systems use map sensors. once you get up to so much power on a maf system, you just to have to start guessing for fuel mapping.

 

Interesting.

So, can anyone tune these I6's yet?