Trans wiring to activate relays? 4L60e/4L80e
10-10-2016, 04:37 PM
#1
Restricted User
Thread Starter
Trans wiring to activate relays? 4L60e/4L80e I'm not sure if I'm going to describe this accurately, but I can't find much info on google. I guess maybe I'm not specific enough to find what I'm looking for.
The schematics don't give me a ton of info, since I'm not sure what each wire going to the trans actually does, and when.
I was wondering if a different wire is sent to the trans for each gear. For example, power is sent down wire A to force the trans to shift into 1st gear, wire B to force it to shift into 2nd gear, etc. I'm looking for a good boost-by-gear solution and if I can use the trans wires to somehow activate relays, I could easily solve a few issues I'm having.
My main concern is first gear. Is there a specific wire that sees power/ground when shifting into first?
The schematics don't give me a ton of info, since I'm not sure what each wire going to the trans actually does, and when.
I was wondering if a different wire is sent to the trans for each gear. For example, power is sent down wire A to force the trans to shift into 1st gear, wire B to force it to shift into 2nd gear, etc. I'm looking for a good boost-by-gear solution and if I can use the trans wires to somehow activate relays, I could easily solve a few issues I'm having.
My main concern is first gear. Is there a specific wire that sees power/ground when shifting into first?
10-10-2016, 07:06 PM
#2
Moderator
No, there are two shift solenoids. When both have power (ON/ON) you are in 1st gear, when both are OFF/OFF, you are in 3rd gear and the ON/OFF and OFF/ON combos give you 2nd and 4th.
Don't know what your electronic fabrication skill level is, but a couple of dirt cheap TTL digital logic chips (e.g. a 7400 and 7406) could produce a unique signal for each gear. (Need a few resistors to reduce the +12V to +5V for the chips and probably need drivers todrive a relay.) You could do the same with eight SPDT relays, preferably solid-state.
This diagram might give you more info:
http://www.msgpio.com/manuals/mshift/wiring.html
The megasquirt/megashift is an open-source project for building very flexible engine and transmission controllers. Kits and complete units are also available. For example, it can add paddle shifters to the 4L60E.
Don't know what your electronic fabrication skill level is, but a couple of dirt cheap TTL digital logic chips (e.g. a 7400 and 7406) could produce a unique signal for each gear. (Need a few resistors to reduce the +12V to +5V for the chips and probably need drivers todrive a relay.) You could do the same with eight SPDT relays, preferably solid-state.
This diagram might give you more info:
http://www.msgpio.com/manuals/mshift/wiring.html
The megasquirt/megashift is an open-source project for building very flexible engine and transmission controllers. Kits and complete units are also available. For example, it can add paddle shifters to the 4L60E.
10-11-2016, 09:09 AM
#3
Restricted User
Thread Starter
I have megasquirt on my Corvette. Stock ECU on my Nova.
The problem is 24 PSI in first gear on a 275 Pro in the Nova. It just doesn't hook, even on a well prepped track. If I don't hit the tires hard on the line, they spin as soon as boost hits.
These two shift solenoids, do they each have a wire coming from the stock ECU? If so, I could produce a unique power circuit for the first 3 gears with just a pair of cheap 5-pin relays ($2/each) by tapping into these wires. Each power circuit would be hooked to something that determined how much boost that particular circuit received.
If I wanted just lower boost for 1st gear, I could do this easily with a cheap dual stage boost controller from ebay and have it controlled by the shift solenoids so I wouldn't have to use a toggle switch. I'm having trouble finding an affordable solution that works, but it looks like a pair of these cheap ebay controllers would actually allow me to control boost by gear for every gear. I would be $110 into having boost by gear on the stock ECU. If I can find something with 3 boost settings that isn't PWM controlled for less than $110, I could cut costs even further.
The problem is 24 PSI in first gear on a 275 Pro in the Nova. It just doesn't hook, even on a well prepped track. If I don't hit the tires hard on the line, they spin as soon as boost hits.
These two shift solenoids, do they each have a wire coming from the stock ECU? If so, I could produce a unique power circuit for the first 3 gears with just a pair of cheap 5-pin relays ($2/each) by tapping into these wires. Each power circuit would be hooked to something that determined how much boost that particular circuit received.
If I wanted just lower boost for 1st gear, I could do this easily with a cheap dual stage boost controller from ebay and have it controlled by the shift solenoids so I wouldn't have to use a toggle switch. I'm having trouble finding an affordable solution that works, but it looks like a pair of these cheap ebay controllers would actually allow me to control boost by gear for every gear. I would be $110 into having boost by gear on the stock ECU. If I can find something with 3 boost settings that isn't PWM controlled for less than $110, I could cut costs even further.