MAF translator results

[BJM]

I put in my new translator with a 3" LT-1 MAF. Actually that MAF fits almost all GM vehicles.

The translator works fine but I had to switch MAF Base to rich to get my BLM numbers down across the board. Now my idle value seems similar to what my stock MAF was but at the high flow end the BLM number is 146 where it used to be 130-134. Is this typical. I am guessing the new one is possibly more linear. It seems like the computer is still in control but I am close to the limit within the chip.

Chip was unchanged through all of this. I have even increased fuel by 2 psi to push the BLMs down a bit.

Anyone else have his experience. Is that why the MAF WOT knob is there, to help with these things?

 

[blackbuick87]

Dont mess with the WOT setting, it should be on zero unless you have an extender chip.
Also my car ran like crap on MAF Base 3, which is the setting for 3"LT1 MAF. Try putting it on zero, makes the car idle much better, with no off idle stumble

 

[Eric Stage I]

Because a normal chip is limited to an airflow of 255, the WOT setting won't do a whole lot. However, it does seem to affect AF numbers under 255, even without the Extender chip. For example, I had some trouble getting the AF to 255. I was getting about 240. I adjusted the WOT setting richer in the Translator and then it would peg 255, it also affected BLM's in cell 15 (before it locked to 128). I would assume that when the Translator modifies the WOT airflow numbers, it probably rescales the whole range, affecting AF numbers further down the scale. (I don't know for certain.)

So, to sum up, you might try adding fuel to the WOT setting and see if your BLM comes down in the higher airflow range.

Eric

 

[blackbuick87]

Maybe it was due to my Thrasher, but when I tried richening my WOT settings my car had an off idle stumble, could not do a burnout to save my life, and had a "flat spot" around 10-12psi of boost. It was a disaster. WOT was unchanged

 

[Eric Stage I]

Exactly Bob, thats what I mean. Your WOT will be unaffected because you cannot go over an airflow reading of 255 (and your Thrasher was already reading 255). However, at 10-12psi, you must have been too rich because the "midrange" airflow readings were affected by the Translator's WOT setting. In your case, for the worse .

Eric

 

[BJM]

I wondered if the 3.5MAF numbers would be similar. They must be if setting 0 works okay. I am using 4 right now. If I reset the computer while on 3 the INT would peg at 150 until the engine warmed up enough to start learning. 4 worked way better for open loop and while too cold to learn. Anyone using the 85mm MAF setting for anything?

I have not tried the MAF WOT yet but I don't see why an extender chip would be needed if its just scaling airflow values. I have not attached the ignition connector yet, where are those wires best accessed?

I will have to try the 3.5MAF settings.

I know our OEM MAFS put out frequency pulses. What do the new ones do, analogue voltage changes?

 

[crazygn]

sorry to jump in on this but where can i get this lt1 maf and what ever else i need to run this.

 

[GN ERGY]

Get the maf from GM parts direct and the translator from Ramchargers. Nobody will beat GM parts direct price, I got mine there. Tarey D.

 

[ijames]

I know our OEM MAFS put out frequency pulses. What do the new ones do, analogue voltage changes?

No, it's still a variable frequency triangle wave but instead of about 20 to 150 Hz (I said about; I'm too lazy to go look up the exact numbers, sigh ) the new ones are about 1,000 to 15,000 Hz.

 

[TurboDave]

Sounds like a project for me this winter when the GN's are laid up

I've got one with the LS1 MAF and one with the stock setup. Just happen to have a nice dual trace O-Scope sitting out on the garage bench looking for something to do