Need Help With MAFT Gen II Settings

[essentialDSM]

After searching the forums and scouring the web, checking fullthrottletech.com forums, and looking unsuccessfully for a phone number to get support on this product, I turn to DSMTuners, where I should have probably began in the first place.

I have the MAFT Gen 2, the one with all the digital settings, but not the MAFT Pro. I am just trying to get my car to a point where I can drive it down the road and have some fun. I have invested literally thousands of dollars in an ugly car (check the profile) that can only sit and idle. I am at my wits end. At this point, all I want is a relatively stock setup - the internals are beefed up and ready for high boost as soon as I can afford larger injectors and get this DAMN THING TUNED PROPERLY.

Setup:

Stock injectors (390cc, automatic car)
Stock MAF (I have a GM MAF installed in the UICP, not connected)
16G
Walbro 255
8.8:1 Arias pistons
ARP Studs throughout (head, mains, conrods)
Cometic head gasket
Ported head
1mm Oversized valves (3-angled)
Stock cams
Megan AFPR (set to stock, 48lbs)

...hope I have haven't overlooked anything.

 

[essentialDSM]

...I forgot to finish the post!

Wrapping up, here's my deal: a broke college student has been working on a car for nearly three years. Lots of money dropped, and I wear the scars that working on this car has earned me PROUDLY. My blood is in its oil, so to speak. This ONE thing is standing in the way of me and turbo-spooling nirvana.

Please, DSMTuners members, I've been here a while. Everyone is great here. This is what I need:
Is there a spreadsheet out there somewhere I can enter in values and get settings for the MAFT Gen II? I found one for the APEX'i SAFC, but not my product. Has anyone tried to do what I am doing? Is there somewhere listed on the web the correct settings to just make the car run right, like baseline settings? Is the fact that the MAF I am using is a GM part off an Isusu trooper the reason it won't work with the GM MAF, and I have to use the stock MAS?

I have zeroed out all the available settings in the MAF Translator, and it has not helped. The A/F guage sweeps, so I know I am in closed loop, and switching setting on the Translator does affect the car, (remember, it just sits and idles, and falls on its face every once in a while when I change settings in the Translator) so I know it's connected/wired in correctly.

What can I do? Can anyone using the Gen II MAF Translator kinda gravitate to this post and tell me what has, and has not, worked for them? Better yet, if there are any DSMers in the Omaha/Lincoln area, or the whole state of Nebraska, I'd buy the beer if you'd come and help me out!

This is driving me mad! What a long post...

 

[essentialDSM]

It is also probably worth mentioning that I also have MAF off of a 2002 Chevy Silverado with the 5.3L motor just sitting around. I could put that on, if needs be. Is there any kind of test routine I can do to ensure that the stock MAS, or the 3" MAF off the Isuzu, or the 3.5" one off the pickup are working properly? I will answer any question anyone has that can help me.

Thank you all in advance.

 

[kingjust]

Use the 3" maf, your not boosting high, and the 3" is just fine. First thing is to get the car idleing properly, better yet to start. When you initially turn it on, and if spliced right, it will ask for defaults like what MAF you are using, what liter is your car, etc. etc. (the GEN II) When that's done, turn on the car and see if it starts. When you get to that point, come back on, because there are so many other things you can do. And read the manual, it will help, trust me!!! And get a wide band! but for an over view. With the fuel low is for idle (at the specific RPM's with in the GEN II), mid is basically medium throttle usage, and high is WOT. Cruise is going to be controled from the ECU since during cruise you are actually in vac. So from rpms 400 - 1200 adjust fuel for idle, then adjust those settings based on your driving habits. You'll understand when you start F-ing with it. It's a good piece, but get a wideband because if not, and you keep messing with it, this will happen...
I think it was because I was trying to tune be feel (yeah i'm a dumbass, but that was a year ago, i'm smarter and wiser now ) and I think one of my manifold to turbo bolts back out and cold air got sucked in some how and poof, bye bye valve... sexy aint it? OL But most definitly get a wideband, you'll thank me later, and it's easier to tune with the GEN II.

 

[essentialDSM]

Thank you, Kingjust, I appreciate it. I never realized that the ECU would handle idle and down low running, that's a duh on my part. The suggestion to get a wideband seems more like an insurance policy, from the look of that valve. Thanks for the reality check.

Here's what I don't get: the motor will idle with the Gen II plugged in, but won't rev, and the A/F gauge sweeps, indicating closed loop operation. Unplugged, it won't idle, but will rev, and it'll limp from place to place if I have to move the car. It just runs rich as hell without the Gen II plugged in, and ungodly rich unplugged. Is there any way to know what values to plug into what setting? The manual is vague, and honestly, I don't understand it.

I will try tuning with the GM MAF plugged in, though. There is every chance that the factory MAS is faulty, considering its age.

 

[kingjust]

Thank you, Kingjust, I appreciate it. I never realized that the ECU would handle idle and down low running, that's a duh on my part. The suggestion to get a wideband seems more like an insurance policy, from the look of that valve. Thanks for the reality check.

Here's what I don't get: the motor will idle with the Gen II plugged in, but won't rev, and the A/F gauge sweeps, indicating closed loop operation. Unplugged, it won't idle, but will rev, and it'll limp from place to place if I have to move the car. It just runs rich as hell without the Gen II plugged in, and ungodly rich unplugged. Is there any way to know what values to plug into what setting? The manual is vague, and honestly, I don't understand it.

I will try tuning with the GM MAF plugged in, though. There is every chance that the factory MAS is faulty, considering its age.

Ok, I kinda getting the picture now. Did you get the plug adapter that plugs into the GM MAF from the factory maf connection? Because it could be your default settings. Honestly, the MAF T is primarily used with a blow thru setup. Let me know all that you did, maybe I can narrow down the problem. Later!

KJ

 

[essentialDSM]

there are 2 signal wires going from the stock mas to ecu. which one do i tap the gm maf to? i have never been sure.

 

[kingjust]

there are 2 signal wires going from the stock mas to ecu. which one do i tap the gm maf to? i have never been sure.

Whoa Whoa... stop right there. The gen II shouldn't have you tapping anything near the MAF. Are you sure you have the Gen II? Because all you need is an adapter, that fullthrottle sells, that connects the factory maf connection to the GM. Then everything else is spliced at the ECU. Take some pics of what you have and I'll take some pics of mine!

KJ

 

[blair6389]

there are 2 signal wires going from the stock mas to ecu. which one do i tap the gm maf to? i have never been sure.

Yea whoever made that manual is a complete retard. That is the most god damn confusing thing I have ever read. After loads of research I found out that all the wires go to the ecu and not some to the stock MAF harness. And searching threads is the biggest pain in the ass. You can never find exactly what your looking for. It's all beating around the bush. And people wonder why theres a million threads on similar topics. If you need help keep asking questions, I'll gladly help you.

 

[kingjust]

Yea whoever made that manual is a complete retard. That is the most god damn confusing thing I have ever read. After loads of research I found out that all the wires go to the ecu and not some to the stock MAF harness. And searching threads is the biggest pain in the ass. You can never find exactly what your looking for. It's all beating around the bush. And people wonder why theres a million threads on similar topics. If you need help keep asking questions, I'll gladly help you.

Same here, if you gotta question, let'er rip... But blair, which maf t do you have? The gen 1 or 2. I never had to splice anything with the gen ii, I think that is what the OP has if he splicing into the factory maf wiring. If that's the case, i'm out the loop, I only know gen ii. Bummer! Either way, ask'em if you got'em... questions that is! 4life

 

[blair6389]

I have the Gen II. I haven't installed it yet but I have done the research to find out how to install it. I also have this harness that converts the stock MAF harness to the GM MAF plug in:


I am pretty sure its you plug that harness in with the GM MAF then tap the selected wires from the Gen II control module to the ECU. And that should be it I think.

 

[Buzzb87]

I'm going through this process as well, and it is very frustrating. I did get my car running, but now am having hesitiation under boost that I am trying to figure out. Anyways, you do need the adapter cable pictured in the previous response for the MAF itself, and also need to use the splices that came with your maft gen 2 to splice into the ecu, which is underneath the radio in the center console. Use the wiring diagram to know which pins to splice. See this link from steve for the pinout and to fix a problem I ran into, which is that the pinout is as viewed from the wire side, not the pin side.
http://www.dsmtuners.com/forums/showthread.php?t=246467&highlight=ecu+pin+out
Also, after setting up your default information, you will need to adjust your main scale (base line) fuel percentage if you have bigger injectors. I have 680's, so set the main scale to subtract what percentage larger your injectors are from the stock 450's. You can then adjust this value until the car idles it's best, using a logger to view your trims, timing, o2. Hopefully this helps.

 

[LTUDSM]

when i bought a Maft genII i got a good manual,no bulls*it was in there,connected the wires to ECU,plug the Adapter from stock Mas to GM Maf sensor.Made adjustments in Maft unit,and good to go ) took me like 3 hours to make it work.

 

[kingjust]

I have the Gen II. I haven't installed it yet but I have done the research to find out how to install it. I also have this harness that converts the stock MAF harness to the GM MAF plug in:


I am pretty sure its you plug that harness in with the GM MAF then tap the selected wires from the Gen II control module to the ECU. And that should be it I think.

You have it exactly right! I'll take some pics and show you all how I have it mounted to give you guys ideas!

KJ

 

[essentialDSM]

Sorry I've been gone so long, and thank you all for the information. I had no idea that I needed that cable, the adapter from the stock plug to the GM MAF plug. The image above is exactly what I have, but that cable was not included - it must be extra, I guess. Everything is on hold until I have that cable, right? Unless there is another way? I wonder how I might make my own cable...or if that's possible.

 

[blair6389]

Sorry I've been gone so long, and thank you all for the information. I had no idea that I needed that cable, the adapter from the stock plug to the GM MAF plug. The image above is exactly what I have, but that cable was not included - it must be extra, I guess. Everything is on hold until I have that cable, right? Unless there is another way? I wonder how I might make my own cable...or if that's possible.

Nah just buy the cable. Don't be so cheap. It's the only logical way.

 

[blair6389]

You have it exactly right! I'll take some pics and show you all how I have it mounted to give you guys ideas!

KJ

Yea I was wondering where/how to mount this thing. Got them pics?

 

[kingjust]

Yea I was wondering where/how to mount this thing. Got them pics?

I'll get them up today while i'm at work!

 

[essentialDSM]

once that cable is bought and installed, my issue (other than the bodywork) is still the tuning. What do you set the settings to in the MAFT? It's nice to know that I only have to worry about the mid and high settings, though. I never thought of that...do you have to lean it out or enrich the A/F mixture? As it is, the car runs and drives, but uses about a quarter tank every 10 miles or so. Should I turn the fuel pressure up or down? It falls on its face until 4000rpm and then runs like hell, even at 16 psi. Maybe upping the boost to 19 psi will burn off the excess fuel...is there a guide out there somewhere? I've gone so far as to study the compressor maps for the small 16g - it seems to reach its maximum efficiency at ~20-22psi and 7000rpm.

 

[anchew02]

i noticed you said you have you fpr set at 48psi that could be causing your rediculous rich condition too. 38 1g and 42 2g right guys?

 

[beendenied]

2g=43.5 psi