8973 setup help

Just bought a 8973 for my car. Bbc with a 12 amp promag and box. Running a powerglide. Need help with the setup of the wiring. All i reallly want from the box is to be able to pull timing out as and ramp it back in on the start line and down the track. I run a logger so i will be able to activate each setting by time. It seems to me that there is a lot of wires idont need. Do i need the retard steps?

 

And always cycle the trans brake/dark blue wire before setting are checking base timing.

 

Yep, that's a good point ...I was nearly caught out on that one but why does it show a different base timing when it hasnt been triggered?

And then the right base timing afterwards?

Sorry to hijack the post ....

Russ

 

I use the time retard graph with some timing out with the blue wire activated. When i fire the engine, the amount out on the first line will be out when checking the timing. If I cycle the blue wire and let it run through it's timing function, it returns to the correct base timing that the crank trigger is set at.

 

Hi Mike

I have had the same experience as B. Doucet.

There is no rpm curve - no launch curve - just a time curve.

But I think the key is that there is timing out @ 0.0 seconds ....

To explain further - I have 4.0* out @ 0.0 seconds - start my engine and check timing -it shows 22* (not 26*) but cycle the blue wire (run) and it then goes back to 26*.

I figure this is pretty important because I didnt discover this til after having the engine out but I use a crank trigger so I knew it was in the right position and the difference had to be the 8973. If I had changed the timing by 4* I figure I would be buying some new parts

Again, apologies to the original poster for the hijack ....

Russ

 

The new Power Grid does NOTHING when you pull timing out @ 0.00 from launch, it runs straight off the mag/trigger. You have to pull the timing @ 0.01 for it to work. That was a scary few minutes in the pit. lol.

 

My Power Grid pulls it out at 0.00. I pull the same amount out for .25 seconds and then start the ramp so I wonder if that makes a difference. Are you ramping back in right after the launch?

 

It depends on how you have your main timing set I suppose in reference. We just noticed because we wanted to run just straight -3 off the mag the whole lap. So I set the timing at 0.00 -3.0 in the first launch box. Hit the switch when we were warming up and guess what didn't happen when we had the timing light on it. Put it to 0.01 and it yanked it right out.

Since you're ramping back in, your function was different than ours as you had another point for the system to gauge another reference. I just gave it a single point to do something, and it was right at 0.00, so I think it confused it.

Just thought I would share for everyone else's benefit.