Extender Chip / MAF X-Lator Flow Numbers

[Nish Limaye]

How does (if any) setting the translator to "lean" or "Rich" affect the Grams per second value I see on my scan tool?

Thanks,
Nish

 

[TurboBob]

Actually, it does.

Reducing the airflow signal seen by the ECM makes the ECM deliver less fuel, which leans the motor out.

so, leaner reduces Grams/sec
Richer increases grams/sec

but, remember, if your car LIKES being leaner it will pull more air which will push the GPS value higher.

Bob

 

[tminer]

Edit: Bob beat me to it!

How does it manage to adjust the fuel? I would assume by modifying the MAF output since to my knowledge one does not need an Extender chip (although without it the 255 gps range is a limiting factor).

Only WOT works on the old style MAF cars (Turbo Regals). The base lean/rich are for the new style MAF cars (LS1, 3800') only.

Tom

 

[JDEstill]

Well, I got beat to it to! But here's my rambling's anyway:

Are you sure? I figured it changed the amount of fuel by adjusting the gm/s reading a bit.

For example, I've been playing with mine a bit. I don't have the Extender, just the Trans+ with a regular chip.

With the T+ on the 3" setting, at 65 mph and a TPS = 0.90 mV I got a 20 gm/s reading, a BLM of 146, and 3.66ms of injector pw.

With the T+ on the 3.5" setting, at 65 mph and a TPS = 0.90 mV I got a 25 gm/s reading, a BLM of 107, and 3.68ms of injector pw.

Same TPS reading with both, same final inj pw (so the actual air flow must have stayed the about the same, since it was in closed loop and maintaining the a/f ratio), but a 20% difference in gm/s reading. The higher gm/s and lower BLM cancel each other out to give ~ the same fueling.

I figured that at WOT, where it's in open loop, changing the gm/s reading by 3% would also therefore change the fuel delivered by that same 3%.

I could be wrong about how they did that though, just my guessing.

John

 

[Nish Limaye]

Bob,
If I am on lean idle, does that reduce ECM airflow signal over entire range including WOT?

If so, can I scale us the GPS value (kind of a correction factor). My setting would be 3" MAF, Lead Idle.

Nish