I am about to order a EBL and was wondering if I need a gauge for the WB or if the WUD is responsive enough to show me. I would rather not have a gauge, but if it will not show me accurately enough I will.

Also was wondering about any information on using a 7427 as a tranny controller. Right now that is what is in the vehicle and I am using a 4l60e. But I have been trouble finding how to use it as one. I have searched and only come across people saying it can happen and they have..

One last thing is with the EBL am I going to need a spark control module?? The module that is next to the TB. Because I do not use one of them now and have no wiring for one.

Thanks!!
Adam

 

is will go to the tenth on AFR. I would get an ESC, but I'm sure Rbob will respond to narrow it down
The What's Up is very fast on data transfer/display.

 

Does the newer ECM take care of the responsibilities that the ESC used to control?? Or why did GM stop putting them in the later vehicles? Sorry for all the questions but I want to make sure that this swap will be possible before starting to buy all the stuff. I am not scared of wiring I just do not understand how to combine the two computers and what needs to go were. I know others have done this and any help or pin out diagrams explaining what to use would help so much.

 

This has been done with the '7427 PCM and EBL. As mentioned will need to wire in an external ESC module (knock filter). The PCM has it on the MEMCAL, where the EBL uses the external module. Which I like better anyway as it can be easily changed for another one.

The PCM gets BAT+, IGN+, and ground, then TPS and the tranny signals.

The EBL also gets the TPS, along with everything not connected to the trans (MAP, distributor, IAC, injectors, etc).

The VSS signal from the PCM should have a transistor to buffer it to the EBL ECM. This is nothing more then a 2N3904 and a 10K 1/4W resistor. Just place it in the harness with some heat shrink over it.

For the actual wiring you can make an adaptor harness, or pin in another set of connectors. The adaptor harness type has a set of connectors that plug into the current harness (in place of the PCM). then has the two sets of connectors, one each for the PCM & EBL ECM.

Pinning in another set of connectors is where the connections that only go to the EBL ECM are removed from the PCM connectors and placed into the connectors for the EBL ECM. Then the wires that go to both are spliced with another wire/pin.

Adding an additional SES light for the EBL ECM is recommended.

RBob.

 

For the VSS would the drac unit take care of that??

For the TPS signal do you only need to jumper the signal or does the output voltage need to be jumpered also? I thought I remember reading that a some type of Rpm baseline needs to be brought to the pcm also..? maybe not?

 

The DRAC goes to the PCM, and is also buffered with a 2N3904 and sent to the EBL ECM. The 2N3904 buffer may not be required, but I tend toward the safe side.

The TPS output signal goes to both the PCM & ECM. No need for additional buffering.

I don't believe that the '7427 with the $0D code PCM needs RPM for the trans control. If it does only need to jump the REF+ and REF- between the ECM & PCM.

RBob.

 

Cool, I am going to pick up a couple ECMs 7727s tomorrow and a 7427 and some harnesses. So I can start making a harness without destroying the stock harness. Also want to try and run it first with a 7727 before the EBL to make sure nothing is wrong in my wiring. I am a bit etchy on the ESC stuff still and what all goes were but I think I can figure it all out. Will I need a different knock sensor then?

Thanks for all the help.
Come spring this could the first EBL in a rx7...

 

Please note that the EBL uses the '7747 ECM. Or any of the others listed below.

1226868 CRS, '85 MonteCarlo?
1227429 ARW/ASB, S10 2.8l, '86-'88
1227746
1227747 Many Trucks & Vans
1228062 Blazer
1228063 Camaro, Firebird: '88
1228746 Camaro, Firebird, Caprice: '89-'92
1228747 Truck
1228838 ATYM, Lumina, '90, 3.1l
16136965 Caprice, Roadmaster wagon: '91-'94?
16144288 Blazer, AULR
16146299 Truck
16149405 AUSP, TRANS SPORT, SILHOUETTE, LUMINA: APV, '93 3.1l
16196391 BJBF, Lumina, Trans Sport, '94-'95, 3.1l
16196396 94-95 trucks, MT

RBob.

 

Sorry, that is what I meant. But thanks for listing that just in case.

 

Well I made the adapter harness. The engine runs and responds well with just a stock 7747 ecm. But the tranny is still not right. I have bat+ ignition+ and ground. Also have all the tranny connections on still connected, and finally TPS signal and tps ground. It feels like the PCM can not see the TPS signal because it feels like there is no line pressure build up. It takes a lot of rpms to get moving. I only moved it about 10 feet. Do I need to jumper the 5 volt reference from the pcm to the ecm also?? It makes sense to me but maybe not. If somebody that has done this could chime in that would be great!!

 

Don't jumper the +5 V references together between the ECM & PCM. The TPS signal from the harness should be jumpered to both ECM & PCM. Use one or the other to power up the TPS & MAP sensors. You have a PM.

RBob.

 

I got it figured out. I went through some more posts and found out that you need to jumper ICM high and low reference. Did that and it shifts and drives like a dream.

Any one know if the ostrich is possible of emulating the 7427. It has the big blue box with the built in knock filter for a memcal. I want to play with tranny shift points and lock up. Right now it is all from TBIChips and it is horrible.