85 maf tuning(porting)?
Thread Starter
Racer
Joined: Jan 2005
Posts: 476
Likes: 0
From: Tucson, AZ. L98-85 AUTO COUPE: 120k MILES: daily driver. SOUND OFF IF YOU'VE BEEN THERE. Ex-Jumpin' Junky-82nd Airborne-2/505 PIR: 1st ID-1/16th Inf: Recon Marine Retread. GOD BLESS GRUNTS.
85 maf tuning(porting)?
is there a faq on how to port or modify mafs to get the most air flow without reducing sensor response? i've done a search and couldn't find diddlyl. i want to know what to do and how to do it. is that too much to ask?
thanks, frog
thanks, frog
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
this issue has been beaten to death.
some say, "remove the MAF screen"... others say it doesn't matter.
I am not sure.
Generally speaking, the TPI is the real restriction. On a stock L98, modifying that will give you the best results. And really, your best bet isn't so much modifying, it's replacing.
By the time you spend hours honing, machining and such, it's easier and cheaper to upgrade.
Check with Edelbrock, Exotic Muscle, TPiS or LPE. They all have options for upgrading the TPI.
some say, "remove the MAF screen"... others say it doesn't matter.
I am not sure.
Generally speaking, the TPI is the real restriction. On a stock L98, modifying that will give you the best results. And really, your best bet isn't so much modifying, it's replacing.
By the time you spend hours honing, machining and such, it's easier and cheaper to upgrade.
Check with Edelbrock, Exotic Muscle, TPiS or LPE. They all have options for upgrading the TPI.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
If it were me I'd take the money for an aftermarket MAF and either get some AS&M runners, or drop the entire intake system off at a competent porter. I believe Bob@precisionporting is a supporting vendor and I hear he does good work reasonably.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
The first step is to locate the grooves around each end that mark the end caps which hold in the screens.
Then run a sharp knife blade around those grooves quite a few times till you have cut through to the inner neck of the MAF. When that happens you should hear a "snap". Then use a flat blade to pop the end caps free; it may be necessary to do a little more cutting of the groove.
Once the end caps are off, remove the screens and use some sand paper to smooth the ends.
Then cover the two ends of the inner sensor wire tube with duct tape and take a hack saw to the five cooling fins of the heat sink. Use a Dremel to smooth the remnents of the cooling fins a little, wipe out and blow out any Al dust and remove the duct tape from the ends of the sensor tube.
Don't handle the MAF too roughly as the internal sensor wires are small and somewhat sensitive.
Then run a sharp knife blade around those grooves quite a few times till you have cut through to the inner neck of the MAF. When that happens you should hear a "snap". Then use a flat blade to pop the end caps free; it may be necessary to do a little more cutting of the groove.
Once the end caps are off, remove the screens and use some sand paper to smooth the ends.
Then cover the two ends of the inner sensor wire tube with duct tape and take a hack saw to the five cooling fins of the heat sink. Use a Dremel to smooth the remnents of the cooling fins a little, wipe out and blow out any Al dust and remove the duct tape from the ends of the sensor tube.
Don't handle the MAF too roughly as the internal sensor wires are small and somewhat sensitive.
