If your going to keep fuel injection then you will need a sensor that reads crankshaft position. I know they make one, I believe it mounts on the bell housing and reads the flexplate. I'm assuming it's an auto and your wanting to keep the stock ecm.
the gray area between ?to pcm or not to pcm? that is the question!
i guess for gauges you need some of the on board ecu. but can you take out the "re" and swap out with the "46rh"
mopar used to put out a crate motor magnum with carbed intake. cam snout is different for the fuel pump. chain cover from the la blocks! humm?
how involved is this cross bread?
I think trying to keep the pcm and get everything communicating properly, without a crankshaft position sensor will be challenging. Without that signal the pcm won't provide ground for the fuel pump. Someone correct me if there's a way around this. I agree with spun360, going with a rh would be easier, but keep us posted on where this build goes.
Once I realised your using a carbed la... since you will have a mech fuel pump and you won't have to worry about fuel injection, I don't see much reason to keep the pcm.
I doubt the trans would work with out any info from the motor. The pcm also works the gauges. Why do you want to put in a LA to begin with? kinda going backwards in my opinion.
Gotcha. I would want to keep it as well then. Unfortunately I am not sure how you can work around that. I would think that is getting into pcm building territory. If it's even possible to do, get rid of the fuel injection. I am unsure of what the pcm reads for the electric control of the 46re. Probably engine speed, possibly map, so I'm sure there would be a lot to it.
I was thinking if I run all the sensors on the motor it might work. The only think that will not be hooked up is the injectors and the tps. The reason I am doing this is because I just got a 3360la with 450hp given to me cause the quy cant race any more
How are you planning to bypass the injectors and map sensor? I know there is dummy sensors for the 02 sensors. But I'm wondering how your going to get the right info to the pcm
I'm sure there are some guys with 46re knowledge. I'm thinking the other possible input would be the map sensor. Monitoring pressure and engine load. Of course there's the tv cable. maybe someone else will chime in. But let us know how it goes
I think your best bet is to remove the pcm and run a 46RH or 727. The pcm monitors the engine sensors for rpm/load conditions and and adjusts shifts according. With out a crank/cam /tps etc... the pcm doesn't even know the motor is running. I guess you could experiment and put vital input sensors on the motor and see what happens if you got the time.
rh will still require a tps and maybe crank sensor for OD and LU. Operationally, the 2 trans require the same stuff. You can put OD and LU on switches though, and control them manually.
Well forget using the PCM. Drop the motor in, find a hot lead and a run lead from the ignition switch and get going. Use a 518 with the PATC controller for the OD/LU. Done.
And get used to a check engine light. The PCM runs lots of other stuff that make the truck work. AC compressor for a start. When you pull the wires off the 5.2 the check engine light will be all over you.
hate to say it. but your prolly going to repeat yourself for a few of us simple folk till we get you some knowledgeable help.
if the 46re is built to the max: sprags, clutches, bands, drums, & what not, perhaps the loss of the re valve body wouldnt be so bad. i believe patc can turn a re to a rh. just the valve body would be a loss?
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