What electronics does a VH45De NEED to run?

[defrag010]

I've been reading around here for a while, because I bought a wrecked Q45 as a donor swap car for my rx-7.

I had planned on yanking the engine/transmission/wiring harness/ecu to install in my rx7, but the more I read about all these electronic functions the more I'm getting worried.

Here are a few of the main things that I'm worried about:-Is the Engine/transmission harness separate from the chassis harness?-What exactly does the FPCM do? and is the fuel tank temp sensor important?-Will the ECU trip a code if all of the EGR stuff is gone?

Basically, I'm doing a minimalist install, and I'm trying to figure out the barebones necessities for the engine to run and funciton properly.

Also, how hard would it be to convert the fuel injetors to top-feed style?A few of the ones in my motor are bad, and are they rebuildable?

Is there anyone that makes a OBD-1 datalogging interface so I can scan codes?

[RobertsnewQ]

I've been reading around here for a while, because I bought a wrecked Q45 as a donor swap car for my rx-7.

I had planned on yanking the engine/transmission/wiring harness/ecu to install in my rx7, but the more I read about all these electronic functions the more I'm getting worried.

Here are a few of the main things that I'm worried about:-Is the Engine/transmission harness separate from the chassis harness?-What exactly does the FPCM do? and is the fuel tank temp sensor important?-Will the ECU trip a code if all of the EGR stuff is gone?

Basically, I'm doing a minimalist install, and I'm trying to figure out the barebones necessities for the engine to run and funciton properly.

Also, how hard would it be to convert the fuel injetors to top-feed style?

Is there anyone that makes a OBD-1 datalogging interface so I can scan codes?

Starting from the beginning:1. The engine/ECU harness is "somewhat" separate. You can take them apart but there are shared connectors.

2. The FPCM controls the fuel pump speed. There are three steps: Hi, Med, Lo. You can run the fuel pump off the ECU's fuel pump relay output with no problems. The FPCM mainly reduces fuel pump noise at cruise, and increases fuel pump life.

3. If the ECU is from a Federal (non CA) car, it will not trip a code. If it is CA, it may trip one.

4. Injectors you're on your own - I don't think anyone has done it. Call RC engineering in CA and ask them for advice.

5. There are a number of Consult interfaces (Nissan's name for the OBD interface) available, including one that I make.

If you are using the Q engine in a different chassis, some people (including myself) can reprogram your ECU to ignore the EGR, carbon canister, FPCM and anything else you want. Email me if you're interested.

[chinaonnitrous]

Starting from the beginning:1. The engine/ECU harness is "somewhat" separate. You can take them apart but there are shared connectors.

2. The FPCM controls the fuel pump speed. There are three steps: Hi, Med, Lo. You can run the fuel pump off the ECU's fuel pump relay output with no problems. The FPCM mainly reduces fuel pump noise at cruise, and increases fuel pump life.

3. If the ECU is from a Federal (non CA) car, it will not trip a code. If it is CA, it may trip one.

4. Injectors you're on your own - I don't think anyone has done it. Call RC engineering in CA and ask them for advice.

5. There are a number of Consult interfaces (Nissan's name for the OBD interface) available, including one that I make.

If you are using the Q engine in a different chassis, some people (including myself) can reprogram your ECU to ignore the EGR, carbon canister, FPCM and anything else you want. Email me if you're interested.

Exactly what this guy said!

[MinisterofDOOM]

This is a very interesting idea!

I'm curious:I'm not too directly familiar with street legality of modern engine swaps. Seeing as this is OBDI and you're in OK, I'd assume there's a way to register the car, still. But I'm curious as to your plans (and the possibilities) there.

[defrag010]

Thanks for the quick responses!

I'm actually in Arkansas right now, so there are no emissions or motor swap regulations. If I was in California, the car would have to be smog legal, pass emissions, and the engine would have to be the same year or newer than the chassis (my car's a 1991, and the engine's a 1991, so no problem there)..... but I'm not, so it's all good.

-fuel pump, I was planning on running a walbro 255pump because I'll be spraying the motor too. I was worried that the FPCM controlled the pump voltage to regulate pressure like a returnless system, but I was mainly worried about the ECU flipping out. I'll be using an aeromotive FPR with return, so pressure regulation isn't a problem.

robertsnewQ, I do have a few questions to ask you about the OBD interface. Also, about chip burning. I'm familiar with 27C256 chip editing and burning (plus using romulators) in DSM ecus, but I don't know how to decompile the Q45's eprom layout and identify the parameters from hex. I tried to open a .bin file from a JWT chip in live edit, but it was just scrambled up. What's your email? I appreciate you helping out with advice!

Oh, one last thing before I go to bed...

I have tried to find info on here for months about sooping up the RE4R03A transmission for nitrous use, but the only thing I can find in stone is the transgo shift correction kit and the 700$ PCS programmable TCU.Is anyone familiar with valve body mods that will raise line pressure and reduce shift overlap without hanging in gear and having no kickdown? I tuned my 240's line pressure by putting a pot on the TPS feed to the ECU and adjusting the tps to a little higher voltage, but it hung in gear and didn't kickdown right.I can get the converter rebuilt to about a 3000 stall (a litlte below the vh's torque peak), but I've been trying to find info on how to tune-up the transmission's hydraulic system.

Modified by defrag010 at 1:44 AM 1/30/2006

Modified by defrag010 at 1:45 AM 1/30/2006
Modified by defrag010 at 12:38 PM 1/30/2006

[elwesso]

Im sure you know that level 10 does the rebuilds...

I bet that the engine itself woudl run if you justd used the stock wiring harness and ECU..... all you gotta do is give the engine fuel and electricty, and it will go.

[RobertsnewQ]

I have a definition file for Tunerpro that I'm happy to share with anyone that wants it. It covers all the basics.

Beyond that, I've done some fairly extensive disassembly to identify the carbon canister, fuel pump speed and EGR routines, as well as modify the O2 sensor code to use a wideband O2.