Seems like you did a good job of narrowing it down to the air/electric shift mechanism or internals of the trans.

Which is it air/elec?

When you talk about the 1000 rump jump, you seeing that on a data logger?

 

Shift solenoid is electric.

Since the car was new to me, i wasn't sure about the converter stall. At first i thought maybe it actually was shifting but converter was flashing to rev limiter or something funny like that so I flashed the converter and it stalled at 6000.

Transmission was supposedly just freshened by Wayne Horton by PO.

RPM jump was mentioned by fellow racer, also seen on replay on 450 box, and can be heard on video.

 

It can be seen on the vid:

In Car Vid

 

This link should work...

 

Yea, I hear/see it in the vid. I wonder if the throttle stop could be doing something funny? (like a second stage)

 

To me it looks like it shifts fine and then has issues, which tells me its not a low voltage or electrical problem to the shifter solenoid. Do you have a throttle stop on it or any shift retards wired into the 7al3 ? Im not sure its a electrical issues at all, but maybe more of a trans/conv issue.

 

Actually, check it in this video. The original video was somehow cropped by the software. My buddy sent me this one that isn't cropped. In this version of the video, you can see the shifter. If you watch close, when it hits the shift point, the shifter moves ever so slightly, then after a second finally shifts, but seems to be very slow to shift. Should that not hammer that shift home instantly?

All throttle stop timers are at 0.00. Right now I'm only using it as SLE.

Video Here

 

What kind of shifter is it? Is the shifter new? We had one last year that needed to be lubed where it slid.

I had a similar problem 2 years ago it turned out to be the cable was getting tight.You really couldn't feel the difference but I noticed it on the data logger.It would shift at a different rpm every run,put a new cable in it and all was well.

 

I can see it in that video, but I still dont think thats the solenoid, because it looks to shift fine. Almost looks like a shifter/cable problem like Ken said above, which shifter is it ? Just went through something kinda similar on 2 cars with bad shifter cables or shifters not adjusted correctly.

 

The main question is why does it go past the shift point to the limiter before it shifts. During that run, shift point was set at 6500 rpm, and the car went to 7800 (limiter) before it shifted.

Shifter is a Phantom, with a Biondo electric solenoid. Neither are new. Shifter operation feels smooth but i will lube it.

I unhooked the cable at both ends and its as smooth as silk, not stiff or binding at all. Checked the adjustment from both ends, and all is in order there as well.

I ran it through several shifts just activating the solenoid, and it shifted without hesitation and much faster than it does during the run.

It seems that whatever it is, its only when running under load, as again, it shifts flawlessly on the stands with a fully charged battery.

 

You can hear something sound like its slipping in the video. Have you shifted it by time out of the Mega 450 on a run to see what it does ?

 

Actually yes, same results.

 

Id have that trans out and looked at if it were mine, sounds like something is slipping between first and 2nd causing it to rev.

 

i did take this trans apart and look at for Curtis Boggs i believe. it all looked good put it back together the way it was cut and cleaned the converter make sure fluid is full recheck the band loosen nut turn adjuster all the way in torque 72 in lbs back it out 3 1/2 turns if all else fails shift it manually no box hooked to it see if it shifts instantly or still with a delay?

 

also see the converter is flashing to 6100 then on the shift it drops back to around 5500 which doesn't make sense should drop back no lower than 6100 which could explain what some are hearing and calling a slipping or jump up in rpm almost like maybe sprag is slipping can't remember if it was spragless converter or not

 

Wayne, you are correct, you did look at this tranny/converter. When i spoke to you last fall, you said it was a spragless converter.

On one run it was shifted manually, and shifted fine, but still took the rpm jump at half track.

 

Edit, on the manual shift run there was no in car video and i thought the rpm jump was still there, but just watched another video that was taken from behind the car as it went there did not seem to be any noticeable rpm jump....