I connected co2 to shifter. Ran at test by dropping launch and output setpoint on stands. Launched at 1500, shifted fine at 2500 into 2nd and 3rd. Seemed to work fine. No issue.

Went to track Sunday, car launched at 2500 (setpoint) and dropped power just before shift and then shifted (6600) and really lit tires and headed to wall. Logger showed it dropped to to 2850 before shift.

I am guessing something is creating a conflict? I used the same shift points as original owner had though 6600 instead of 7200. The only element is I did try to get shift light to work, maybe that created a conflict or overide?

Car is an 85 notchback with a 512 C.I. 460 based motor. 1250 dominator, mech roller cam, 2 1/4" exhaust headers and C4 with 5000 stall TC. 4.10 gear with detroit locker and 28 X 10.5 X slicks. I bought a couple years ago from buddy who succumbed to cancer a year later.

Sorry to sound like rookie, but Ford stuff and Grid are new to me. Would like to get solid pass in then sell off drivetrain and put big SBC in. Got 8 passes in, nothing corrected other than handling at top end.

Any advise/help would be appreciated. I did read output switch may not be best to activate shifter.

Not sure I am following. lost power before shift? Lit the tires so bad you when to wall on shift? Are you pulling timing (power) on shift? If so it looks like the grid is working but your car is not. No car unless its 1500+ hp on really ****ty track should lose traction on shift that bad.

Or you are killing way too much power, unloading suspension and putting all timing back in when unloaded. Either way its not right. What do you mean it dropped back to 2850 before shift.

Did the car launch at prescribed rpm and shift? If so, the grid is fine and you need to figure out what is wrong with suspension causing it to lose traction.

I will try to post the grid recording. My initial thought was timing released. Is nominal 35 dropping to 25 on activation/release of button. I did no setup other than drop shift to 6600 from 7200 though I did try to get shift light to work. On run engine faded out,car was already trying to move around. Then after engine faded, it came back and lit tires and headed straight for wall so I lifted. Think wife was heading toward cardiac event.

It was the last TNT at home track and many issues had happened ahead of me. I have nobody who was involved with car to ask anything. I was told at purchase time handling was a work in progress. first ride on county road had it going everywhere but straight whether on/off gas or brakes. Now handles fine. I also made some suspension adjustments and swapped heavy springs out in rear.

Car had plenty of fuel (110) and nothing amiss other than fade out like a limiter was kicking in.

I would go thru every table and make sure nothing is set that you do not know what its for. Sounds to me like something is setup cutting things out.

If you had it logging you could see if a rev limiter was activated.

Lots of variables.

Even regardless of the grid and car cutting out it should NOT dart around down track that much. So either track or car or combo.

I agree should not dart. I told them let me run single because new to me car. This 1st time went right. I wonder if locker had anything to do with that. Power came back in a big rush. I lifted so no issue.

I am wondering why it died then came back, I was careful to only change shift point though I did mess with shift light setting. Looking at graph, it shows it hit shift point for a bit before dropped off. Then shifted. When tested on stands shift was on time, dropped rpm a little and went into 3rd on time. Shift light had been set at 12000. I set to 6600. Maybe that created conflict in some manner. I printed the manual from MSD and will read carefully. That late, track likely not at its best. Prior Sat night I ran small tire class andlaunched fine a bumped into neutral looking for shifter. That why I connected and tested co2 shifter. Shifter has no real detent to keep out of neutral. Turbo action warns of that. I did that 4 out 8 passes up to that point. It hooked that night then someone took out timing system and we were done. When I did shift right, it went 110mph after spinning to 330'.

converter too tight and track is ****

I assume you are using the yellow wire for your shift point.

If so - when you’re on and off the throttle before the desired shift point the PowerGrid sees this RPM drop and assumes you made a gear change - and it will then bypass the next programmed shift point.

quote:

Originally posted by Rodney Pryor:
I assume you are using the yellow wire for your shift point.

If so - when you’re on and off the throttle before the desired shift point the PowerGrid sees this RPM drop and assumes you made a gear change - and it will then bypass the next programmed shift point.

I honestly am not certain what wire is being used at present. The odd thing Sunday was I stayed in middle of track WFO waiting for shift out of 1st. Then power faded big time then came back and shifted. I had tested at lower RPM and it appeared everything worked. Except at track. Reading MSD setup stuff, they warn that only limited output and use relay for shift. I have to follow wires back and see where/what connected. I did not wire and likely should not try and shortcut using existing setup. If they using output switch to fire shifter, it only fired once from review. The shift light also activated. I had assumed that was what they were doing as lower RPM test had it fire immediately at setpoint twice. Other thing I am wondering, if they used output why did engine fade and come roaring back?

I will need to go through entire setup and verify operation. The shift light was set all the way out. I may have created a conflict that killed power. Reverse engineering a setup is a pain, more so with being unfamiliar. My mistake which I can rectify with time.

Handling issue it had is gone. I can always lift when something unusual happens.

Thanks for the input.

are you famliar with data acquisition function of the grid

Yes. Was able to see limiter, then drop off and shift (both shift light and switch.

As mentioned previous, it almost seemed like timing restored but graph showed steady 25. Nominal timing at 35, 10 pulled on release of button.

First recorded pass on chip looks like soft 2 step launch at 2000 and maybe manual shift. Shakedown pass.

Still looking at some in between runs to try get handle of what goal was.