The 85mm maf fits inside the 98mm lid. we have a coupler for use with the slp lid. a smooth bellow does fit on the other en and will fit over a 92mm tb iirc. if not we have a 30* elbow for that also.

 

MAF inside lid and siliconeintakes 30* bend in 3.75'' or 4'' cant remember

 

Never even noticed my maf went missing other than having less tables to tune

 

Everyone that goes SD says good things. May need to go that way too when I upgrade the intake.

 

Sd has its purpose but there are issues with it.
Every American automaker use mafs now. Even dodge. There is a good reason for that. If they could make an os without it and use 1 less sensor, you know they would.

 

Overall drivability and efficiency usually improves with a MAF system. It's the difference between the ECM KNOWING exactly how much air is going in and closely ESTIMATING it and working off a VE table. Over-simplified, but basically true.
I just read all thru Greg Banish's book "Engine Management Advanced Tuning". A LOT to be learned there. Even though it's 10 years old, the principles therein still hold.

 

I know for a street car my tuner prefers a maf, ( he tunes a butt load of cars, owns his own dyno, ) told me he would do a sd for me but likes to do those for a mostly strip/ serious street car.

 

Which MAF should I run?

Half the forum responds with "Go SD"


Guy is looking for help on which to use and how to connect them. I'm sure he's thrilled that this is now a thread about SD.

 

SD is only most effective in a narrow-scope situation like racing where just following a VE table is all that is needed. Street driving is better served by a MAF setup due to its inherent flexibility and ability to respond in real time.

 

Run a smaller tb on a wide opening intake like a 92mm tb on a fast 102 and watch an sd tune lose it's mind.
The table resolution is lost also. Esp on 2bar/3bar systems.

 

This is true. A MAF is superior in steady state airflow, think cruising. And in low emissions vehicles they even run stock widebands.......why? Simple, accuracy for.......wait for it.......fuel mileage. If the pcm can dial in a lean cruise with a maf and stock wideband there IS fuel mpg to be gained. But as far as driver perceived driveability, you will not notice not running a maf. Some even say throttle response is better with SD but I have not witnessed that.

I couldn't imagine this being a big deal to an experienced tuner. Why do you suppose this is such an issue?

 

Someone else besides me said that first (trying to find quote). I have seen it as an issue also but I have not perosnally tuned any like that. Tuning cannot change the way airflow transitions inside the manifold.
The lower resolution i quoted earlier is part of the issue. Esp on 2 and 3 bar os.

 

Maf vs sd is a zombie horse argument. Everyone has their own experience and ideas and theories on it. Now youll find a "tuner" in nearly any town. And the internet is full of em too. Good tuners are hard to find though. I am not saying i belong to either group.

You want a good maf thats straight forward use the truck/z06 85mm maf with harness adapter. We sell a ton and all of the customers we recommend them to have great outcomes and are happy.

 

SD and a good tuner

 

MAF readings are more accurate above 5000 RPMs. So, the MAF tables are set to supercede the MAP readings above 5000 or so. Manifold absolute pressure (MAP) gets very high as the air roars into the motor at high RPMs. The MAP reading then in turn causes the ECM to increase the fuel rate to more than the motor actually needs.


Since the MAF measures air by flow instead of density, its a more accurate measure at higher RPMs. The MAP readings are sufficient from idle to about 5000 to operate the motor efficiently. That's why SD tuned motors idle well. Beyond 5000, the MAF tables supercede the MAP readings and allow the fuel rate to lean out.


For race cars, as in a trailed car where MPGs are unimportant, SD tunes are OK. The OEMs use MAFs on street cars to increase MPGs, to meet emissions, and for drivability.


Also, a good MAF will not choke the motor. The throttle body will if it is too small. The throttle blade is the greatest restriction to air until it is in the WOT position.

 

Map stops at 4k.

But you are right about the ve. At a certain point itll repopulate the same cells but they could be different situations and if you are choking an engine and the map starts to fall th base fuel will be off also.

Most gen4 comps dont even use map per se. They do in virtual ve but some tuners turn ve completely off and run solely off maf.

 

I am not familiar with Gen IV or V systems. Have to wait for the 5th and 6th gens to age more and the parts become more available. Just an old hot rodder. I still like gen 1s :-


You are also correct, the stock configuration sets the tipping point where SD kicks in at 4000.

 

My $.02 on MAFs....
https://ls1tech.com/forums/pcm-diagnostics-tuning/1875217-tutorial-maf-scaling-high-horsepower-setups.html

 

reread his post. The MAP stops at 4k in a stock tune....not the MAF. Above 4k stock tune, only the MAF sensor is looked at....which has nothing to do with fuel mileage haha.

 

But it DOES have to do with more accurate fuel metering...