MAFT Gen 2 - Anyone?

[TurboBob]

Originally Posted by Drweldin

MMCD scales at (from Clint's thread):
"Scaling for AFR input - Changed in 1.6N
Old 0-5V = 10.0 - 20.0 AFR
New 0-5V = 8.0 - 22.0 AFR "
So my LC1 is set for 0-5V = 8.0 - 22.0 to work with the MMCD 1.8G...not
sure what the LC1 is out of the box(?).....is there a scaling feature in Gen2 (almost looks like there is because of a screen called "WB correction"?) or do I need to revert to another version of MMCD, or choose one or the other (MMCD or Gen2)??

The LC1 has 2 analog outputs. You should program the other analog output as a regular LC1 and use it for the Gen-2.

I don't know where Clint got the 8.0 - 22.0 range from. He indicated that it was some sort of standard. But I have not found a single wideband unit that uses this range. If you know of one, let me know.

Bob

[Drweldin]

Originally Posted by TurboBob

The LC1 has 2 analog outputs. You should program the other analog output as a regular LC1 and use it for the Gen-2.

Good idea - I'll try that....

[Drweldin]

Originally Posted by TurboBob

possibly, for the air temp and baro. Not for airflow, that should work without CEL's.

I am running a Gen-2 at the moment on my car, without any CEL's. So you should have none.

Bob

OK - I set the V1 and V2 like you suggested, and now have acceptable values on the logger for Air temp and Barometer.....no CELS at this point....

[Drweldin]

Originally Posted by TurboBob

the load based tuning is usually used when the GEN-2 is being used to compensate for oversized injectors. the MAF based tuning is simpler and works well when tuning with the stock injectors.

Otherwise, use whichever you wish (or both...)

Bob

Bob,

Im still a little confused on these (2) points (and a couple others)...

1) So under "System settings" are all of those parameters for "MAF Tuning"?
They are: "Main Scale", "afterstart", Lo load, Mid Load, etc.....should I zero them all out if using "User Tune" like an AFC?
2) Not understanding how you can use BOTH AFC mode and MAF mode -- can you explain?
3) Under "Config" -- "Load Source" should this be set to TPS for using as AFC, or "MAF/RPM".....? See question #2
4) "MAF Sensor / tune" - I have zero frame of reference on this one....what should the values be here?
5) Spark advance option is not availble / compatable with 3S - correct?

Thanks again,
Aaron

[TurboBob]

Originally Posted by Drweldin

Bob,

Im still a little confused on these (2) points (and a couple others)...

1) So under "System settings" are all of those parameters for "MAF Tuning"?
They are: "Main Scale", "afterstart", Lo load, Mid Load, etc.....should I zero them all out if using "User Tune" like an AFC?
2) Not understanding how you can use BOTH AFC mode and MAF mode -- can you explain?
3) Under "Config" -- "Load Source" should this be set to TPS for using as AFC, or "MAF/RPM".....? See question #2
4) "MAF Sensor / tune" - I have zero frame of reference on this one....what should the values be here?
5) Spark advance option is not availble / compatable with 3S - correct?

Thanks again,
Aaron

1: mainscale shifts the entire tune and is the starting point if you are running oversize injectors. with stock injectors leave it at 0
afterstart is used if you have lean running after you start the engine, most notably when the engine is warm. leave at 0 for now.
leave the load points where they are.

2: there is a value called "UserTune" which is the sum of all your tune settings. If you have a lean spot and you know it always happens at 35 grams/sec airflow, you can add fuel at that point in the MAF page, if you have a rich spot that you know is at 4000 RPM, you can remove fuel there in the tune pages.

3: leave it at MAF/RPM.

4: leave them all at 0 for now

5: not with a Gen-II

[Drweldin]

Originally Posted by TurboBob

1: mainscale shifts the entire tune and is the starting point if you are running oversize injectors. with stock injectors leave it at 0
afterstart is used if you have lean running after you start the engine, most notably when the engine is warm. leave at 0 for now.
leave the load points where they are.

2: there is a value called "UserTune" which is the sum of all your tune settings. If you have a lean spot and you know it always happens at 35 grams/sec airflow, you can add fuel at that point in the MAF page, if you have a rich spot that you know is at 4000 RPM, you can remove fuel there in the tune pages.

3: leave it at MAF/RPM.

4: leave them all at 0 for now

5: not with a Gen-II

1) Mainscale is relative to what? Is it a correction factor like an AFC? -35% for example, with 550cc injectors? So should the lo / mid / hi values (not the MAF values, but the values with there own pages) be the same as the mainscale? Or are those used to fine tune the mainscale?

2) This implies they are working at the same time....again, I have no reference in my mind for "grams/sec".....is there a link I can study from?

EDIT: do you know the MAF lo/mid/hi values, I may have inadvertantly moved them a little....
Also, I am using 3 1/2" (metal) LS1 MAF, 560cc EVO injectors....

[TurboBob]

Originally Posted by Drweldin

1) Mainscale is relative to what? Is it a correction factor like an AFC? -35% for example, with 550cc injectors? So should the lo / mid / hi values (not the MAF values, but the values with there own pages) be the same as the mainscale? Or are those used to fine tune the mainscale?

2) This implies they are working at the same time....again, I have no reference in my mind for "grams/sec".....is there a link I can study from?

EDIT: do you know the MAF lo/mid/hi values, I may have inadvertantly moved them a little....
Also, I am using 3 1/2" (metal) LS1 MAF, 560cc EVO injectors....

1: yes. -35% is a good starting point for 560's. Set that and see what the trims do at cruise. You want the trims to settle to 80 (removing fuel) and the O2 trim to hang around 80. This may sound "rich", but I have found the best driveability with this method.

In the settings page, there are high, mid, and low "load points", set the low to whatever your load calculates to at idle (look at the sensor monitor page), this will be 25-35 if I remember correctly. This lines up the low load page so it tunes your idle. Set mid to about 100 (this is "zero psi" or close), set high to 140-ish, this is 6-7 psi and sets the high page to adjust from this load and higher.

The Pro takes the mainscale, adds it to the user tune (interpolated between pages), and any other tune adjustments, adds them together (this is the UserTune shown on the sensor monitor page), and adjusts your airflow by this amount.

2: Watch the "airflow" reading on the sensor page to get a feel for it. Idle is 4-8, cruise is 10-30, and accelleration goes up from there. It is almost proportional to Hp.

Are you running draw-thru or blow-thru?

Bob

[Drweldin]

In the settings page, there are high, mid, and low "load points", set the low to whatever your load calculates to at idle (look at the sensor monitor page), this will be 25-35 if I remember correctly. This lines up the low load page so it tunes your idle. Set mid to about 100 (this is "zero psi" or close), set high to 140-ish, this is 6-7 psi and sets the high page to adjust from this load and higher.
What about the indivdual LO / MID / HI pages that appear to function like an AFC? If I leave those at -35 (or whatever) it ADDS this value(on sensor monitor page) to the User Tune and arrives at approx. -70....which doesnt sound right - is it? Or do these change in smaller increments to "fine tune" the "mainscale"? Does that quesiton make sense?

The Pro takes the mainscale, adds it to the user tune (interpolated between pages), and any other tune adjustments, adds them together (this is the UserTune shown on the sensor monitor page), and adjusts your airflow by this amount.See above question....


Are you running draw-thru or blow-thru?
Blow Thru...but waiting for an axle seal so I havent actually driven it yet....

Bob

[TurboBob]

if the tune pages are set to -35 and mainscale is -35, then the effect is -70 as they are added together.

They are the same increment.

The turbulence in a blow thru application can make the car run a little lean. Easy to tune around this, just wanted to mention it.

B

[Drweldin]

Originally Posted by TurboBob

if the tune pages are set to -35 and mainscale is -35, then the effect is -70 as they are added together.

They are the same increment.

The turbulence in a blow thru application can make the car run a little lean. Easy to tune around this, just wanted to mention it.

B

When I set them both to -35, the car won't start.....or run I should say....but I only tried this once. When I set the mainscale OR the tune to -35 it runs fine.....but not both....AFR was too high.....too lean.
Are you saying the -70 is normal, considering 560 injectors??