MoTeC Global Forum

Hi all

Had a play at setting up the DBW motor. How does this look?




Thanks in advance

How does it sound? Is it quiet or is there constant hunting? Your Delay constant seems large to me.

What actuator or DBW throttle do you have? Where are the throttle position sensors mounted (motor, or throttle blade, or both)?

What does the Control Feed Forward table look like?

David Ferguson wrote:How does it sound? Is it quiet or is there constant hunting? Your Delay constant seems large to me.

What actuator or DBW throttle do you have? Where are the throttle position sensors mounted (motor, or throttle blade, or both)?

What does the Control Feed Forward table look like?

Sounds pretty steady. I got the Delay constant (and the starting figures) from the Jenvey website, where the motor came from (an ETA2).

Being a V6 I put one sensor on one bank of throttle bodies and the other on the other bank.

Just looking at the numbers I think the feed forward table is a bit light at the lower end -

0% = 0
1% = 8
100% = 21

Averaging out the number between their 4 cylinder and 8 cylinder characterisations, I think the 1% value should be around 13 which might help out the dip below target when lifting off the throttle in the test.

A little video I took -

https://youtu.be/zEU2UdK7LB4

I've got my Radical SR8 running with dual Jenvey ETA2s, one per bank. I used the exact values in their (Jenvey's) datasheet. I've not ever seen improvement by changing anything...

I don't think the average between the 4 and 8 cylinder specs are far out. I did a bit (3 hours) of tweeking on a really boring family boxing day zoom call and think it's safe enough for road use until I can it to a pro to review.

Might email Jenvey and see if they have a 6 cylinder example to crib, ready for when the parts arrive to improve the crank wheel angles, and the battery has finished recharging again.

PS. Very jealous that you have an SR8. Had to race my old Corolla with some SR3's a couple of times, their closing speed was horrific! My current build will put up a bit more of a fight

I think you should fix your linkage angles with a dual DBW setup. Then I'll have somebody else in the same boat as me.

parsonsj wrote:I think you should fix your linkage angles with a dual DBW setup. Then I'll have somebody else in the same boat as me.

Thanks...but no thanks...got enough headaches as it is.