Wietse
Well-Known Member
It is downshifting now so there is progress by adjustments, which means IMO there is nothing mechanically wrong or something.
It's just a pressure balancing act between the line pressure (increased by throttle pressure) and the governor.
Transgo knows the spring rates and associated pressures that should come with it, i send them an email with my pressure readings and will see what they reply.
I suspect my governor pressure does not work well with the combination.
My car had originally a 22" radiator, which means it came with a standard rear axle with a 3.23:1 ratio, now i am running a 4.10:1 ratio with a cone-type sure grip. (guess this was pulled from a donor car, incl. the 28" radiator)
My theory is that the governor i have installed is suited for the 3.23 ratio, now with the 4.10 ratio rear axle it provided too much pressure for the speed the car is going due to higher drive shaft rpm's.
And likely for that reason i need to force the throttle linkage to provide a higher pressure also earlier than normal to "counter-act" this behavior to get decent shift points.
This is why the "as-per-the-book" adjustment worked out really bad.
I am not sure about this, as far as i looked i did never find any different part numbers or whatever for different governor "guts" that suit different axle ratio's and nobody seems to know if there are any at all.
Before the overhaul the tranny also always required an extreme long rod setting to get it to shift decent, and even then i was always taking roundabouts in 3rd as it would not downshift until a full stop.
And now if i slow down it goes back to 2nd as well, so coming of a roundabout or tight corner it picks up much better in 2nd instead of being stuck in 3rd and drive like a dog.
It's just a pressure balancing act between the line pressure (increased by throttle pressure) and the governor.
Transgo knows the spring rates and associated pressures that should come with it, i send them an email with my pressure readings and will see what they reply.
I suspect my governor pressure does not work well with the combination.
My car had originally a 22" radiator, which means it came with a standard rear axle with a 3.23:1 ratio, now i am running a 4.10:1 ratio with a cone-type sure grip. (guess this was pulled from a donor car, incl. the 28" radiator)
My theory is that the governor i have installed is suited for the 3.23 ratio, now with the 4.10 ratio rear axle it provided too much pressure for the speed the car is going due to higher drive shaft rpm's.
And likely for that reason i need to force the throttle linkage to provide a higher pressure also earlier than normal to "counter-act" this behavior to get decent shift points.
This is why the "as-per-the-book" adjustment worked out really bad.
I am not sure about this, as far as i looked i did never find any different part numbers or whatever for different governor "guts" that suit different axle ratio's and nobody seems to know if there are any at all.
Before the overhaul the tranny also always required an extreme long rod setting to get it to shift decent, and even then i was always taking roundabouts in 3rd as it would not downshift until a full stop.
And now if i slow down it goes back to 2nd as well, so coming of a roundabout or tight corner it picks up much better in 2nd instead of being stuck in 3rd and drive like a dog.