FrontEngineDragsters.Org Forum
Technical => Dan Dishon's Transmission Den => Topic started by: Ezhopper on August 17, 2017, 11:58:02 AM
-
Just wondering what everyone is adjusting there PG bands at - I have heard from 2 1/2 to 4.
-
for years i've done 72" lbs then 3 1/2 back
-
Been doing 3 1/2 for years too
-
this is for when you are building a pg, not a maintenance situation or is it? if so, how often etc.
ty
dean
-
I do mine about every 3 races, or 25 laps.
-
72 inch pounds then out 3 1/2 turns. If it's a new build using a new band, I like to re-adjust after 3 to 5 runs. If its a freshen-up where the band was re-used, or a relined band, I say once at 50 passes, then you should be good for the season. We do a lot of bracket racing and put around 300 passes on a year. I can say at the end of the season the band is still spot on. The key to long band life is running a good dual ring servo. One with a lip seal, or 2 steel rings work the best.
-
thanks for the input, i had to youtube it as never had a pg before. does it matter if its kevlar band or not? mine has kevlar and two ring servo.
dean
-
No the adjustment is the same for all band materials.
-
72 inch pounds then out 3 1/2 turns. If it's a new build using a new band, I like to re-adjust after 3 to 5 runs.
new trans, after you check 3 to 5 runs then when to check next? 20?
ty
dean
-
if your car "rocks" after transbrake is applied I have found that a slightly tighter band adjustment helps this
-
Once the band "settles" in it will be good.
When a car "rocks" be it forward or back, adjusting the band can cure this to a point. When the brake is applied low fluid pressure is sent to reverse causing a drop in pressure to the band. The idea is to have low and reverse to apply simultaneously. If the rings on the servo become worn this can cause a "rock back" as reverse hits first, the same can happen as the seals on the reverse piston wear, this would cause a rock forward. Adjusting the can help with the apply timing to stop these issues. Getting your revese clutch clearance is very important to tight or loose will also cause these issues. No 2 combo's are the same and some Tweeking is sometimes needed, the 72 inch pounds 3 1/2 out is a base line the works most of the time, and it is always the starting spot.