A/F ration at idle

[87we410877]

Ratio** What sould my A/F be at ide? I was thinking about 15. Is that right? Set ups in my sig. Its a FAST. Thanks.

 

[TurboDave]

Ratio** What sould my A/F be at ide? I was thinking about 15. Is that right? Set ups in my sig. Its a FAST. Thanks.

Well, ideally it would be 14.7:1, possibly a bit richer for smooth idle, say about 14:1-13.8:1

 

[JCotton]

I usually end up around 11.5 in park or neutral, 13.5 in drive.

 

[ChrisCairns]

See what your particular engine likes by making it rich, then lean, then settling somewhere in the middle but toward the lean end.

On mine I have it at 12.9 at idle. And cruising around 60 mph I have it at 15 to 1 with timing of 41 degrees.

 

[2QUIK6]

Also, it will probably needs to be a little rich when its cold, mines at 10.1 or so at cold start up and then gradually climbs to 14.7 or so when hot.

 

[87we410877]

Thanks alot.

 

[Super6]

I usually end up around 11.5 in park or neutral, 13.5 in drive.

this is what my car likes best. Bob

 

[V6POWER]

For those without wide bands, should we adjust idle to 128 blm's or go leaner?

 

[2QUIK6]

For those without wide bands, should we adjust idle to 128 blm's or go leaner?

No matter what you end up with for a BLM, the AF will be the same if using a stock style chip as it meets the programmed AFR by adding or removing fuel based on the BLM number.

The original poster is using a FAST system where it is fully programmable...this is not possible with a stock style ECM/chip without a wb and some coding change.

 

[V6POWER]

Thanks for explaination.

 

[2QUIK6]

Thanks for explaination.

But to answer your question, try to get most of your BLM cells close to 128 for best throttle response (and of course your IAC counts to be around 10-50 at idle). It's been my experience, that if you are cruising and the current BLM cell is at say 125, then you depress the pedal quickly and that BLM cell contains say 142, then there a bit of a hesitation for a second..if all of the BLM cells are close to 128, then there less of a fueling compensation difference that has to be met when you jump to different cells. Also keeps the lower and upper boundaries of the same cell close so the BLM# is not varying greatly in the same cell.

But...usually in order to get to this point requires some manipulation of the MAF table in the chip, which very few chip burners do on a car to car basis as every car is a little different.

 

[d0n_3d]

I notice with my Innovate LC1 and Translator Pro setup, my A/F at idle when I first start it up is around 10.4 - 10.8 and then climbs slowly to around 11.2 or so when warmed up. Is this too rich? It kinda smells rich but it starts and runs REALLY well. This is in Park.

 

[2QUIK6]

I notice with my Innovate LC1 and Translator Pro setup, my A/F at idle when I first start it up is around 10.4 - 10.8 and then climbs slowly to around 11.2 or so when warmed up. Is this too rich? It kinda smells rich but it starts and runs REALLY well. This is in Park.

11.2 at idle is rich, mine starts out at about the same as yours cold, but once warm its sits around 14.1 or so. With the TPro, can't it control fueling at 0 load / idle..so you can program it leaner at idle only and it doesn't affect how it drives then off idle?? I have the Gen2 so I'm not sure, but I thought the TPro could.

 

[d0n_3d]

I'm not sure. There is an update version of the TPRO program (version 4.80) in which I haven't updated yet but will very soon. It's supposed to control the A/F ratio at idle and part throttle (basically telling the ECM to go into open loop permanently and letting the LC1 take over the fuel correction). Right now it only corrects at WOT without the update. Apparently the Extender Pro chip has the BLM locked at 128 at all times and the INT still adjusts at idle and part throttle (again without the update). So maybe that is why my car runs so rich right now because it's not essentially being controlled by the LC1 like I originally thought.