4l60E trans psi's.... anyone make sense of whats going on here?
09-27-2010, 10:06 PM
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4l60E trans psi's.... anyone make sense of whats going on here?
its a 2008 chev 1500 with a 4l60e trans.
put a vette servo, transgo hd2 kit (couldnt do boost valve on this trans), billet 4th gear servo.
im not 100% sure on the accuracy of my gauge i used but it should still show whats going on. with fluid at around 170-180F... the P,N,D positions all show around 63-65 psi. reverse doesnt go up much around 90 psi. but if you jerk the throttle a little bit the psi spikes all the way to 250 psi some times. ( i wish i could have installed the new boost valve... doesnt seem a like a completed kit without it)
1st and 2nd gear at wot are at 160 psi to 175 psi.
now with it in 1st gear... if i do a light brake torque to say 1600-1700 rpm the psi will rise to 225 psi and moves with throttle position. as soon as you release brake with WOT the psi drops to that 160-175 psi range.
in 2nd gear with brake torque to same rpm psi jumps up to 210-215 then drops in psi as the brake is released and maintaing WOT.
cruising down the highway at 70 mph or so in overdrive at 1900-2000 rpm psi holds around 150 psi.
if i stop on the highway with it in drive just pin it psi doesnt go to 200+ like i thought it should. it only goes to that 175 or so maybe a little less. so im not sure if the computer is not commanded more line psi or what.
i had the tcm reprogrammed for more line psi at WOT and to remove torque management.
also in overdrive as i move the throttle i can see the psi rise and fall with throttle movement.
trans seems to shift fine and doesnt feel like its slipping at all. so just throwing this up to see if this normal with these new trans or what?
thanks.
put a vette servo, transgo hd2 kit (couldnt do boost valve on this trans), billet 4th gear servo.
im not 100% sure on the accuracy of my gauge i used but it should still show whats going on. with fluid at around 170-180F... the P,N,D positions all show around 63-65 psi. reverse doesnt go up much around 90 psi. but if you jerk the throttle a little bit the psi spikes all the way to 250 psi some times. ( i wish i could have installed the new boost valve... doesnt seem a like a completed kit without it)
1st and 2nd gear at wot are at 160 psi to 175 psi.
now with it in 1st gear... if i do a light brake torque to say 1600-1700 rpm the psi will rise to 225 psi and moves with throttle position. as soon as you release brake with WOT the psi drops to that 160-175 psi range.
in 2nd gear with brake torque to same rpm psi jumps up to 210-215 then drops in psi as the brake is released and maintaing WOT.
cruising down the highway at 70 mph or so in overdrive at 1900-2000 rpm psi holds around 150 psi.
if i stop on the highway with it in drive just pin it psi doesnt go to 200+ like i thought it should. it only goes to that 175 or so maybe a little less. so im not sure if the computer is not commanded more line psi or what.
i had the tcm reprogrammed for more line psi at WOT and to remove torque management.
also in overdrive as i move the throttle i can see the psi rise and fall with throttle movement.
trans seems to shift fine and doesnt feel like its slipping at all. so just throwing this up to see if this normal with these new trans or what?
thanks.
10-11-2010, 10:22 PM
#4
LOL, I saw your post in the other thread...you're really hung up on chirping second gear huh? 
It depends on a lot of things...how the shift kit is set up, what kind of converter is in the trans, throttle angle, how good the tires are, etc. A transgo HD2 in your average 5.3 rcsb with 2 washers in it and the factory torque converter will usually break the tires loose pretty decently at WOT during the 1-2 shift.
It depends on a lot of things...how the shift kit is set up, what kind of converter is in the trans, throttle angle, how good the tires are, etc. A transgo HD2 in your average 5.3 rcsb with 2 washers in it and the factory torque converter will usually break the tires loose pretty decently at WOT during the 1-2 shift.
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