Running a 165 ECM along side a 7427 PCM

[Racprops]

I am building a 93 Custom Van a new drive train.

It is a low RPM Torque Monster SBC 383 that thanks to Roards Veritable roller lifters will produce a torque curve from 1000 to 3000RPMs and power curve from 2500 to 4700 RPMs though a 4L80e and a US Gear Dual Range Overdrive.

It is hoped and believe my special engine will with the 5 gears be able to cruse at around 80MPH and 1600RPMs and get 25+ MPG.

It will not run over 5000RPMs.

I am running 193 Swirl Port heads, stock headers.

All of this will be fed by a 87 Camaro TPI system and controlled by a original 165ECM with its full Lean Burn Cruse custom tuned for best operation.

The 4L80e rebuilt with all the upgrades will be controlled by a 93 7427 PCM acting as the transmission only controller.

This is where I am asking for help: how to set these two controllers up.

My plan so far is to mainly hook both systems up at the same time:

The 165ECM gets all the Camaro sensors, VSS, Knock, IAT, MAF, TPS, Engine Temp, Tach. More of less a full Carmaro set up from a coplet wiring hardness from a 87 Camaro.

The 7427 PCM is the problem, as it will only be controlling the transmission, I am unsure what it needed to operate normally. This is not a drag racer but a RV Cruiser. This will be hooked up using the 93 Stock Van's wring.

So what controls shifting??

I think: VSS, RPMs, TPS(?) and MAP as load sensor. I have read Engine Temp is also need, but why?

I plan on having knock, IAT, and fuel injectors turned off by a programmer.

VSS and RPMs is easy to share being a electronic signal. MAP is also easy to plug into the manifold by its self.

The TPS Throttle Position Sensor is a bug-loo, as it is a sensor managed by the PCM I think I cannot run the PCM and the ECM off the same sensor, so the big question is does the 7427 PCM controlling only the transmission need the TPS??

I am hoping it only needs the MAP to judge load and thus respond to throttle changes requiring a down shift or to do a up shift.

Other wise I will need to figure out a way to add TBI TPS to the Throttle Body of my TPI intake.

Rich

[steveo]

i understand your plan and i know you could probably make it work BUT i disagree with your complicated approach.

my thoughts are if you have VSS, TPS, RPM, and MAP, and disable a lot of codes, you can likely get the 7427 to act as a standalone.

connecting the same sensor to two different ECMs can be problematic. they each send their own reference voltage. it can be a wiring nightmare although anything is possible if you understand analog signalling.

so here's a really big question for you

why not just convert the 7427 to batch fire mpi and dump the other ecm, having one ecm controlling everything?

were you aware the 7427 is plenty capable of feeding a TPI rig? it has been done quite a few times

[Fast355]

i understand your plan and i know you could probably make it work BUT i disagree with your complicated approach.

my thoughts are if you have VSS, TPS, RPM, and MAP, and disable a lot of codes, you can likely get the 7427 to act as a standalone.

connecting the same sensor to two different ECMs can be problematic. they each send their own reference voltage. it can be a wiring nightmare although anything is possible if you understand analog signalling.

so here's a really big question for you

why not just convert the 7427 to batch fire mpi and dump the other ecm, having one ecm controlling everything?

were you aware the 7427 is plenty capable of feeding a TPI rig? it has been done quite a few times

Personally I would delete the OBD1 stuff entirely, EFI Connection 24x reluctor behind a Holley vortec timing cover, convert to coil near plug, get an inexpensive LS swap harness and use a DBC 0411 or P59.

The early GM MAFs are garbage and the only 165 I have ever tuned I went to $12P MAP based code in.

USA made swap harness I am about to use to replace the Proflow 4s garbage ECU setup I am currently running.

https://highperformanceinjectors.com...lhi-connectors

[In-Tech]

Personally I would delete the OBD1 stuff entirely, EFI Connection 24x reluctor behind a Holley vortec timing cover, convert to coil near plug, get an inexpensive LS swap harness and use a DBC 0411 or P59.

The early GM MAFs are garbage and the only 165 I have ever tuned I went to $12P MAP based code in.

USA made swap harness I am about to use to replace the Proflow 4s garbage ECU setup I am currently running.

https://highperformanceinjectors.com...lhi-connectors

Hiya's,
My original thought was to just use the '7427 to handle it all. Man, that wiring harness price is great. Using a 24x crank and 1x cam sensor distributor is perfect. Sequential spark and fuel would be super neat on a TPI. I like it :)

[Racprops]

Gentlemen, I am NOT building a Hot Rod, I am building a MPG low RPM 383 its power curve is from 1000 to 3500 and HP to 4500RPMs.

My money went into the engine and dual transmissions.

It is designed to run at 1500RPMs on the highway.

Upgrading to a hotter PCM is not needed and too costly, I might as well just buy a newer van…IF I was made of money that is and want the new crap.

And everything I can find on Sequential fuel injection show almost no change from the 165’s batch firing, in fact it is said laying fuel onto the back of HOT intake valve helps vaporizing the fuel even for a millisecond.

Sequential fuel injection really only helps with pollution control and even then it is very small.

Spark is always Sequential.

You all work on older Trucks you should understand my needs.

The 165 has a programmable Lean Burn Cruse that BY ITS SELF can give 5 to 10 MORE MPG as can the TPI its self can add 20 to 30% more MPG, torque and HP over any carb.

The Highway Mode drops in at a nice cruse and fades out under load smoothly.

The 7427 also has a lot of programming settings for control of the 4L80e and I am told I can get a partial throttle down shift instead of the classic full throttle to the floor downshift, like my 03 Ford Explorer with its 5R55s does.

This is a Stealth RV Van…a road cruiser not a drag racer. I plan on 2 to 6K road trips where a 25+MPG VS the crappie stock 14MPG can really matter and I can feel less cheated with today’s gas prices.

[dave w]

Many gearhead-efi members including myself share ideas and information that come form personal experiences, including the school of hard knocks (waisted time and waisted money)

There is considerable truth to the statement: The More you Know about EFI the Less you Pay for EFI.

I'm sure many gearhead-efi members will agree with the above statement.

4L80E with 16197427 ECM Links below:

http://www.gearhead-efi.com/Fuel-Inj...0E-Controller&

http://mattw.dyndns.org/4L80E/