Registry 8x Series V8 Swaps

[wiynwiyn]

What engine fan are you using?

I'm using a derale dual fans which push out like 4000 cfm. Coolant tempt never pass beyond 200 F when it's on. The AC compressor was making some loud noises before it blows warm air. I think it's wise to flush out the ac lines to remove the metal debris.

 

[tmxmotorsports]

I'm using a derale dual fans which push out like 4000 cfm. Coolant tempt never pass beyond 200 F when it's on. The AC compressor was making some loud noises before it blows warm air. I think it's wise to flush out the ac lines to remove the metal debris.

OK the psi harness once again sucks you will need to repin the ecm for ac button to trigger the fans to come on or the head pressure will be sky high and damage your compressor ac will not work without air moving across the condenser. Do your fans turn on and off properly do you have low and high speed?

 

[wiynwiyn]

I would switch them out it could be something else this is the easiest thing to do.

yeah good idea. I decided to just get the psi tac pedal harness just to make sure it's the correct one with the truck pedal I used.
And, the harness I got was used on ebay, not sure if it's defective.

 

[tmxmotorsports]

OK the psi harness once again sucks you will need to repin the ecm for ac button to trigger the fans to come on or the head pressure will be sky high and damage your compressor ac will not work without air moving across the condenser. Do your fans turn on and off properly do you have low and high speed?

There is alot to making this set up work proper

 

[NeverFinis]

I use a Toyota A/C fan, from a Supra, that mounts perfectly. Toyota still sells the fan...but people sell mounting kits for generic fans.

The fan is powered via relay to the unused pins on the Toyota A/C pressure switch, which means it comes on when the A/C pressures reach a minimum PSI. There is a thread here on how to do it, and I think I posted it in my build thread.

 

[tmxmotorsports]

I use a Toyota A/C fan, from a Supra, that mounts perfectly. Toyota still sells the fan...but people sell mounting kits for generic fans.

The fan is powered via relay to the unused pins on the Toyota A/C pressure switch, which means it comes on when the A/C pressures reach a minimum PSI. There is a thread here on how to do it, and I think I posted it in my build thread.

This is for just an ac aux fan? Not using the engine fans as ac fan I can see using it as im stuck in traffic need colder ac.

 

[tmxmotorsports]

I use a Toyota A/C fan, from a Supra, that mounts perfectly. Toyota still sells the fan...but people sell mounting kits for generic fans.

The fan is powered via relay to the unused pins on the Toyota A/C pressure switch, which means it comes on when the A/C pressures reach a minimum PSI. There is a thread here on how to do it, and I think I posted it in my build thread.

I wull be doing this on the swap I have in the shop right now in conjunction with a mechanical fan with fan shroud should be tits on hot days.

 

[wiynwiyn]

OK the psi harness once again sucks you will need to repin the ecm for ac button to trigger the fans to come on or the head pressure will be sky high and damage your compressor ac will not work without air moving across the condenser. Do your fans turn on and off properly do you have low and high speed?

I wish they are more detailed in the installation. My fan comes on at 195 F and turns off below that. I wired the dual fans to come on at 195 F, thinking it cools the engine better. I think you are right. I damaged the ac compressor because their is no signal switch to activate.

 

[NeverFinis]

This is for just an ac aux fan? Not using the engine fans as ac fan I can see using it as im stuck in traffic need colder ac.

Yep, AC aux fan. Bolts right up and looks stock. I bought a spare new one because my current one is from a 1987 Toyota Supra...

Wired into the A/C Relay position in the Toyota Fuse Box. This is normally unpopulated in the US market.

Relay is ground activated via unused pins on the Toyota A/C pressure switch. Someone has posted the Toyota part numbers for the two pigtails needed and Lutz sells a relay kit.

I wull be doing this on the swap I have in the shop right now in conjunction with a mechanical fan with fan shroud should be tits on hot days.

Mechanical Fan is the way to go...

This is my post on my build: https://forum.ih8mud.com/threads/lx450-rex-build.1254004/page-12#post-16126450

 

[tmxmotorsports]

Yep, AC aux fan. Bolts right up and looks stock. I bought a spare new one because my current one is from a 1987 Toyota Supra...

View attachment 4161256

Wired into the A/C Relay position in the Toyota Fuse Box. This is normally unpopulated in the US market.

View attachment 4161257

Relay is ground activated via unused pins on the Toyota A/C pressure switch. Someone has posted the Toyota part numbers for the two pigtails needed and Lutz sells a relay kit.



Mechanical Fan is the way to go...

Yep exactly

 

[wiynwiyn]

I use a Toyota A/C fan, from a Supra, that mounts perfectly. Toyota still sells the fan...but people sell mounting kits for generic fans.

The fan is powered via relay to the unused pins on the Toyota A/C pressure switch, which means it comes on when the A/C pressures reach a minimum PSI. There is a thread here on how to do it, and I think I posted it in my build thread.

Thanks. I will look into this. I mean can just run an ac fan in front of the condenser right with a manual switch. Turn on the switch and LC ac switch when you want ac?

 

[tmxmotorsports]

Thanks. I will look into this. I mean can just run an ac fan in front of the condenser right with a manual switch. Turn on the switch and LC ac switch when you want ac?

Uh not really that little fan is aux fan you need your engine fans to come on too .

 

[wiynwiyn]

Yep, AC aux fan. Bolts right up and looks stock. I bought a spare new one because my current one is from a 1987 Toyota Supra...

View attachment 4161256

Wired into the A/C Relay position in the Toyota Fuse Box. This is normally unpopulated in the US market.

View attachment 4161257

Relay is ground activated via unused pins on the Toyota A/C pressure switch. Someone has posted the Toyota part numbers for the two pigtails needed and Lutz sells a relay kit.



Mechanical Fan is the way to go...

This is my post on my build: https://forum.ih8mud.com/threads/lx450-rex-build.1254004/page-12#post-16126450

Wise to run a condenser fan. Using the radiator fan won't keep the ac cold. I'll install the fan. This explains why I have cold ac when start the car in the morning and warm later.
The AC system works by compressing and cooling refrigerant. This fan cools the condenser so it can successfully convert hot, pressurized refrigerant gas into a cold liquid. Without it, the AC will only blow warm air, or the engine could overheat when you are stopped in traffic.

 

[tmxmotorsports]

Wise to run a condenser fan. Using the radiator fan won't keep the ac cold. I'll install the fan. This explains why I have cold ac when start the car in the morning and warm later.
The AC system works by compressing and cooling refrigerant. This fan cools the condenser so it can successfully convert hot, pressurized refrigerant gas into a cold liquid. Without it, the AC will only blow warm air, or the engine could overheat when you are stopped the

Yes your engine fans will keep the ac cool as long as they are on if they turn off at a certain tepm and the ac is on then your ac will suffer. The ac needs air moving across the condenser once again the little fan is for extra cooling not for cooling.

 

[wiynwiyn]

Thank you for the clarification Tommy. *Edit. The switch I ran was to the trans cooler fan and not for the radiator fan.
Is it possible to run the LC Ac switch, power wire to the 86 12 volts, switch power? This seems easier.

 

[NeverFinis]

Thank you for the clarification Tommy. *Edit. The switch I ran was to the trans cooler fan and not for the radiator fan.
Is it possible to run the LC Ac switch, power wire to the 86 12 volts, switch power? This seems easier.

View attachment 4161269

You probably need to put in your tune to turn on the electric fans when the A/C is called for. This should all be automatically controlled by the GM ECM.

An Aux A/C is just for bonus cooling, mainly for slow/idle speeds...

First YT video that came up on search, so many not be the appropriate one:

Let me add, I am using Cruiser Matts A/C lines, which I opted for the extra trinary port. In that port, I put in a GM A/C sensor, which allows my ECM to see the A/C pressures...

 

[wiynwiyn]

Psi said to use a trinary switch. I got the cold hose trinary switch, but didn't wire it up. This diagram is pretty straight forward.

 

[NeverFinis]

Psi said to use a trinary switch.

View attachment 4161280

I edited my previous post.

I am using a GM a/c pressure sensor, with the optional port on Cruiser Matt's A/C lines.

You might be able to convert the Toyota port/switch for a GM ECM... I didn't look into that because I added the extra port on my lines, so I have both, Toyota trinary switch (for a/c aux fan control) and the GM A/C pressure sensor....

Edited: I used this sensor: https://www.amazon.com/dp/B09DG56T11?tag=ihco-20

This will not work on the Toyota A/C port, unless you convert it to a schrader valve type.

 

[tmxmotorsports]

I've done this with no gm trinary switch... Toyota ac button to gm ecm ecm output to relay turns on compressor and idle up for ac also turns on fans ecm controls high and low speed fans also cuts at wot I faked the gm ecm to thinking there was a trinary switch. Yall remember as kids just say no with the egg in the cast iron pan if wiring isn't your thing that's what your brain will do and all yall with electric fans should pay attention .

 

[wiynwiyn]

The black wires from the trinary switch is misleading, should be Yellow or Red (this is the power wire).
I will try to adapt the LC switch in.