I'm fairly new to tuning so please bare with me.

So far, I understand that under most conditions besides WOT(if I am wrong, please explain), BLM's should be in the range of 126-130 since obtaining a perfect 128 is neer impossible. So... if you your BLM's at a given "g/sec" are reading 112, this would mean I am running roughly 12.5% rich at that given flow rate. Am I right when I presume this only accounts for a positive acceleration?


Example:
If "x" is the acceleration...
x is greater than or equal to zero.

This would mean you are not decelerating. So do you simply discard the decelerating BLM values if you are not touching DFCO values? Which BLM value must you look at if they rangle from lets say 112-124 at lets say 18g/sec. If 112 was on decel and 124 was at a constant velocity, which is the "true" BLM you should concern yourself with?


Also, if anyone has an explanation as to why tunerpro will display a timing degree such as a crazy radical number like 27420.22 degrees once every now and then? -that would be helpfull info. (Number looked like that, not exact number)

Can somebody point me in the right direction? -Thanks

 

anyone?

 

When I use BLMs to tune, only the steady state values are of use. No acceleration or decel, just plain steady state. If during acceleration the BLM moves, then AE may need to be adjusted.

If during decel the BLM changes, maybe DE needs to be adjusted.

Or, the driveability is good, the BLMs move around a little, but all is well.

RBob.

 

Thanks for the reply RBob. But how do you know when your in that "steady state?" When looking at the log file in Excel, do you use the value for that rpm which didnt change in the next sample rate?

For example:

sample rpm blm
1 2000 112
2 2000 120
3 2050 128

if all of the above samples flowed at the same g/sec, would you use sample 2? Because the rpm value before it is the same? I wonder if I should make a little macro in excell to delete the values which look like they are accel/decelerating. How would you decipher between the steady state data from the non steady state data?? -Thanks again for the reply.

 

Try to keep the engine in one Block for several seconds, and see what the stabilized BLM is for that block, and use that. May need to foot brake some to do this. Just make sure you don't move the throttle around after you enter a block.

 

I look at delta TPS & delta LV8 (or MAP) from one record to the next. The RPM can be steady but the TPS can be opening. Not sure how to go about that using Excel (I don't use Excel that much).

RBob.