E8 (and E11?) decel cut settings
 

I used to get some noticable bucking when I turned the decel cut on, and it was easy to replicate when decel at the 2,000RPM set point I had it on.

I looked at the default parameters and decided to basically "zero them out", since the E6K had such faultless decel cut with no fancy parameters.
My default map had like 8-degrees retard, 0.5 second delay, etc., and I basically set them all to "0".
This got rid of the bucking, so this little trick worked.

Anyone else mess with these parameters?

I also found out my diff mount is almost dead, so this made the bucking even more noisy...


-Ted

I set the decel cut rpm at 3500 with 1 second delay, temp to 170, decel cut enrich to max ( might change this one), and retard to 0, fuel return to 1900.

I mostly use decel cut to zero my innovative 02 sensor down long hills. Recently I put in a kill switch that cuts power to the grey wire, so I don't really need that anymore. Its much more effective to zero while moving with the throttle open all the way and the ecu off so it can't inject fuel.

3500 sounds awfully high.
I've been trying to get the gas mileage up, since all city driving rewards me with solid 10.5 mpg. :P
I've got my cut set at 1800.
I've tried lower, but the idle wasn't stable for some odd reason.
1500 was just not possible - it would always die on decel, even though my idle is hard set at 1200 right now (too lazy to readjust the throttle stop).

I had added 3% for decel enrich, but this just caused a "hiccup" at 1800 everytime the fuel map kicked back in.
I jacked it back down to "0".

What proggie version are you using?
I think I'm still on the old v1.64.
Your version sounds more updated - I don't have separate RPM engage and disengage parameters.

Thanx for the reply!


-Ted

I'm using 1.71, I think your version cuts on decel regardless of rpm providing its not below the decel cut rpm after the delay. I had the same experience as you with the lowering the RPM, that is it would die, I was getting bog at and below the cut rpm with the decel cut enrich set to 0, and if I went wide open right as it hit that point it would die, turning up the fuel helped some.

are you using a BAC or stepper motor? If so then those settings could certainly come into play as it hits the idle RPM.

I don't think this will have much effect on your gas mileage unless you drive in the hills allot, or do allot of stops from high speed, but it certainly wouldn't hurt.

I had some good results using negative split in the high to moderate vaccum ranges. 1.71 also has a feature where it does target afr for closed loop o2 by a map instead of just one number for idle and one for above idle. With either negative split or 0 split it cruises fine at 18:1 anywhere above 3Krpm (stock ports) might be higher with more overlap. I am running open loop up to 35% throttle from 700-5000 rpm with the target afr map on a steady rise 12.5 at idle to stoic at 3200k to 18:1 3500 and up to 5K. This is in high to moderate vaccuum, as it creeps tword 0 it comes back to 13:1 and above 0 it is 12.5 and under. It won't really be active in these ranges much (if at all) because of the throttle % limit.

I get better than stock mileage in the city and much better on the HWY.

Do you guys Have any more info on this?

I saw I am running rich with lm1 on decel. and have not enabled this yet.

Found any stable settings?