Mass Air Conversion

[map351]

I see someone finally figured out a way to use a Mass Air meter using a L series computer!

" I have real time data using the VAM, Draw through MAF, Blow through MAF and Speed Density on a 2.3 turbo engine. The data measures 12.5 times in 1 second. I can say from studying the data that Speed Density is the best way, Blow through MAF 2nd, VAM 3rd and Draw through MAF 4th.

Doing a 3rd gear pull between 2500-6000 rpm the blow through maf accelerated 3.5 seconds faster than the VAM. The speed density accelerated 0.1 seconds faster than the blow through maf and had a smoother A/F ratio while doing it."

[Martin0660]

I see someone finally figured out a way to use a Mass Air meter using a L series computer!

I dont think its so much that it works, its just new that it works well ;) Guys have been doing the Mass air (draw through) with both the "P" and "L" series stuff for a while, and some have played around with the MAF as a blow through too. I'm converting to the "L" series simply becasue of the faster processor and possibility of more data points in the transfer table. I have the .bin files for mass air on the P and L series as a draw through right now, and am not going to put any time into trying to make those work. Thats how much I like the blow through set up.

I have all of the parts here now.....several mass air meters, LA3, vam to gut for parts, etc. It will all be mounted up and ready to start testing in the spring. I will have the same datalogging, so we will see. I want that VAM gone. After I get it up and running on mine, we can do it on your your Pinto if you like

Bob Myers

[yeahloh95]

thats great i need to get that vam off my car just how do i do it?

[Martin0660]

just how do i do it?

Two options....Get an EEC Tuner / TwEECer and have at it, or wait for me to get it done, and copy my set-up The way I am doing the blow through is sort of new territory so its got to get done for me to give you any help (If it even works ;) ). I have .bin files for draw through MAF with a 80 mm meter if you want to try it that way, but I'm not even going to try it myself.

Bob Myers

[lib88stang]

Put me in line too, and prob my Dad I'm sure you'll get it workin good Bob

[Martin0660]

I'm sure you'll get it workin good Bob

You have more faith in me than I do right now, my head is about ready to explode from reading all the code and tables involved :o I do think I have it figured out, but I need to drive the car and get some data logs to know if i'm right. On the bright side, once I get it sorted out, it should work as well as the VAM system on just about anyones car with a T3 size turbo as long as we use the same MAF electronics, At a minimum, it will be about as adaptable as the VAM is, and you wont have that huge restriction in the intake tract :D

Bob Myers

[yeahloh95]

do you think i'll be able to use it with the holset hy35 i just got ?

[Martin0660]

do you think i'll be able to use it with the holset hy35 i just got ?

Absolutely not! Send the Holset to me, I can do the R&D and then we can all run them :D kidding of course ;)

I have actually put off doing a larger turbo myself just to get this worked out with a T3 turbo as a baseline, then it can grow from there. It will work with any turbo, but the issue is the amount of air being moved. We will need to develop a different MAF voltage curve based on the Holset air flow.

Keep in mind, this is all about actually measuring airflow. The VAF system has a HUGE limitation in that it was fine for a stock system, but even my mild set-up was maxing out the voltage at 3800 rpm with a T3 on a full boost pass, then it was just a restriction in the intake path. My car was basically running off the WOT Fuel Enrichment table and whatever fuel pressure I had hammered into it at that point. In other words, it has no idea how much air is going in, but it was putting in a chunk of fuel based on a table, nothing more.

This is one of the sweet things about the VAM processors, they can adapt to not measuring air, but its a little hairy. It will runon your holset too, but dont put a wideband on it or you will scare yourself.

My car made a serious jump in power by just getting the injectors swapped so it wasnt at 100% duty cycle. Mike (MAP) can tell you, I took him for a ride. The car would blow off the tires in 2nd and 3rd from a roll after the injectors, before it would only do 2nd. I mean that going along at 3200 rpm in 3rd and nail it, and it would spin them off the car. It also picked up enough torque to drive through the clutch with the new injectors. Just image what will happen when we can get the air fuel ratio actually right.

AFTER THE TABLES ARE BUILT and tuned, all we should have to do for the large turbos is datalog the MAF voltage from 2500 to 6200 on a 3rd gear pull, then set up a new table based on that. Burn it to a chip, and we are in business.

Someone remind me why we mess with these 2.3 again?

Bob Myers

[yeahloh95]

ok great i'm all for it and any help i can add i will.... i will also keep the stock turbo on there for a while ,as i have not reached its full potetial yet .