78 to 85 MAF
Thread Starter
Pro
Joined: Sep 2006
Posts: 731
Likes: 9
From: Ivins, Utah
78 to 85 MAF
Hey, what's involved in switching from a 78mm MAF to an 85mm MAF.
I know I need the wiring harness, but other than that is this just a bolt on Mod ?? Does it fit my stock 99 air bridge and Vararam or will I need bigger hose couplers ??
Is there going to be a problem with the fuel air mix or does the 85mm Maf just know how to deal with it ...
I have a pretty much stock 99 C5
Thanks
I know I need the wiring harness, but other than that is this just a bolt on Mod ?? Does it fit my stock 99 air bridge and Vararam or will I need bigger hose couplers ??
Is there going to be a problem with the fuel air mix or does the 85mm Maf just know how to deal with it ...
I have a pretty much stock 99 C5
Thanks
Drifting
Joined: May 2005
Posts: 1,590
Likes: 1
From: Littleton Colorado
I'm pretty sure you need a new bridge, it just won't cover it and stay. Also, you have the old IAT sensor hole that would need to be plugged anyway.
You may also need a bigger coupler from the air box to the MAF. It may work OK, but not sure if it will last.
Lastly, you definately need a new tune. The MAF table is significantly different and will through off your air to fule mixture, it will run badly. There is a howto article on the swap:
http://www.ls1howto.com/index.php?article=25
It says there are 85mm MAFs that are calibrated for the older cars, but not sure how well that works.
BTW its not really going to buy you anything, I'd only do it if you need to do it.
You may also need a bigger coupler from the air box to the MAF. It may work OK, but not sure if it will last.
Lastly, you definately need a new tune. The MAF table is significantly different and will through off your air to fule mixture, it will run badly. There is a howto article on the swap:
http://www.ls1howto.com/index.php?article=25
It says there are 85mm MAFs that are calibrated for the older cars, but not sure how well that works.
BTW its not really going to buy you anything, I'd only do it if you need to do it.
Melting Slicks
Joined: Dec 2003
Posts: 2,857
Likes: 2
From: pawleys island sc
if that's the only mod you're planning I really don't think you'll see any significant gains, at least enough to justifyy the other problems the switch will create.Howevewr, if you want to do it you'll need all the parts mentioned above and a really good tune.
