Drilling Separator Plate Solenoid A/B To 0.040 . Thoughts
06-14-2013, 02:13 AM
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Drilling Separator Plate Solenoid A/B To 0.040 . Thoughts What exactly do they mean increase shift timing ?
Was just browsing and found it and try to do a search I can't find much info on this
I know you have to drill out seperator plate but is this usually done also ? Doesn't seem like it to me
Little clarification would help
http://www.carcraft.com/techarticles.../photo_13.html
Was just browsing and found it and try to do a search I can't find much info on this
I know you have to drill out seperator plate but is this usually done also ? Doesn't seem like it to me
Little clarification would help
http://www.carcraft.com/techarticles.../photo_13.html
06-14-2013, 01:01 PM
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I've experimented quite a bit with drilling the separator plate, but have never tried drilling those holes. I've not heard of anyone wanting/needing to drill them.
With experience builder Jake saying not to, that sounds like good advice.
With experience builder Jake saying not to, that sounds like good advice.
06-14-2013, 02:31 PM
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i wasnt lol just seem odd when reading the article
whats been your experiance drilling seperator plate larger then the recommended size ?
i assume harsher shifts
just trying to learn why i plan on drilling using the recommend guidlines
im about to order some stuff my trans
http://www.700r4l60e.com/store/produ...&cat=62&page=1
i was lucky and when i brought engine drop out trans was rebuilt with only 5,000 miles
i assume harsher shifts
just trying to learn why i plan on drilling using the recommend guidlines
im about to order some stuff my trans
http://www.700r4l60e.com/store/produ...&cat=62&page=1
i was lucky and when i brought engine drop out trans was rebuilt with only 5,000 miles
06-14-2013, 03:09 PM
#6
The solenoid feed holes supply the shift solenoids with oil from the actuator feed circuit.
As short and sweet as possible. The pump makes line pressure that is regulated by the main pressure regulator valve to 200-270 psi on a typical 4L60E.
That is further regulated down by the actuator feed limit valve to around 100 psi.
This is feed through a ~.025" orifice to each solenoid.
The solenoid exhausts the fluid from this supply until it is activated.
When it is activated it seals off a leak, the oil feeds through the solenoid hole, builds pressure on the end of the shift valve, forces it inboard, and shifts the transmission. A bigger hole would in fact make the shift valve activate faster, but the issue is that too much oil through the supply hole cannot be exhausted by the solenoid and will cause uncontrolled movement of the shift valve, possibly partial apply.
All sorts of headaches....
It's a hack method to overcome a worn AFL valve as well.
GM designed it with proper sized orifices to work with ATF at any normal temp and pressure. Stick with what the GM engineers did for this.
I've done quite a bit of testing with how big we could orifice the feed to a shift solenoid. I can safely say that a stock GM solenoid cannot bleed off .040" feed under all conditions.
As short and sweet as possible. The pump makes line pressure that is regulated by the main pressure regulator valve to 200-270 psi on a typical 4L60E.
That is further regulated down by the actuator feed limit valve to around 100 psi.
This is feed through a ~.025" orifice to each solenoid.
The solenoid exhausts the fluid from this supply until it is activated.
When it is activated it seals off a leak, the oil feeds through the solenoid hole, builds pressure on the end of the shift valve, forces it inboard, and shifts the transmission. A bigger hole would in fact make the shift valve activate faster, but the issue is that too much oil through the supply hole cannot be exhausted by the solenoid and will cause uncontrolled movement of the shift valve, possibly partial apply.
All sorts of headaches....
It's a hack method to overcome a worn AFL valve as well.
GM designed it with proper sized orifices to work with ATF at any normal temp and pressure. Stick with what the GM engineers did for this.
I've done quite a bit of testing with how big we could orifice the feed to a shift solenoid. I can safely say that a stock GM solenoid cannot bleed off .040" feed under all conditions.
