TH350 Governor/Shift weights

[Tim H]

JP1738 what is the latest on your adventure with TH350 weights and shifting rpm ?

[JP1738]

Originally Posted by Tim H

JP1738 what is the latest on your adventure with TH350 weights and shifting rpm ?

I ordered the B&M shift weight kit a few weeks ago and have it sitting in my shop. I have not had time to work on changing it since then. I left it as is for the national at charlotte as it was very consistent the way it was and I didn't get the kit in until the Wednesday before I left. I'm going to work on changing it and experimenting with shift points next week. I'm taking my bracket car out this weekend to see if I can win a second consecutive 6.0 index race. Might get to change it out Sunday or whenever it finally gets dry around here again. I'll have it dialed in to the shift point I'm looking for before the next time I have it out. I'm going to try to go to the CCRA race at Rockingham in 2 weeks, should have it dialed in by then and I'll update the thread with whatever the process ends up being like.

Thanks for not forgetting about me!!!

[JP1738]

Got it dialed in best I can!

The car started out with a #2 weight+orange spring and stock weight+green spring, which shifted at 6750 rpm.

Then tried to make a big swing to see where that put me, left the stock weight side alone and changed the #2 weight to a #1+purple spring (heaviest spring and weight) to see how much that would change the shift point. It made a huge difference and moved the shift down to 5500 rpm.

It seems counter intuitive but a stiffer spring quickens the shift point, I decided to leave the weight alone this time and go to the lightest spring. #1 weight+red spring. That got me right where I wanted to be at 6200 on the button. In the future I may try a slightly stiffer spring, maybe one step up to bring the shift in just a touch sooner, but I think that's good for now.

Final combo for any who might reference this later:
stock weight+green spring and #1 weight+red spring got me 6200rpm.

Sorry to all my neighbors who heard me making test passes at 11pm Tuesday while testing the shifts. Can only test it at WOT...
Also shoutout to the guy who saw me testing again Thursday who yelled "DO A BURNOUT" which I promptly did. I couldn't resist.

*All testing was done in a closed environment and all safety measures were taken (helmet and seatbelts utilized)

I'll include an image of the weight and spring chart for everyone's reference and I'm going to repost this in my class racer build thread as well.

[Tim H]

@ junior barns post #18 seems to be pretty much bang on with your results.