Nomad final assembly

[chevynut]

You’ve had more than your share of problems .

No shit. I've been so careful with everything that I'm really frustrated with all this stuff. I even told myself after purging the fuel rail to turn the engine over by hand before trying to crank it, just in case, then I forgot. I just bought a new set of Holley injectors this morning. I'm going to try to figure out why that injector seems to be stuck open. They all have common +12V and the ECU grounds them in pairs. So if it was electrical, like #7 ground wire grounded somewhere, I'd expect 2 cylinders to be flooded. I'll check to make sure nothing is grounded.

Maybe the new injectors will fix my pressure bleed down problem too. I just wish they were easier to change.

[Rick_L]

Now would be a good time to scrap that antique obsolete C950 EFI system and get something more modern, like a Holley HP or Terminator X.

[chevynut]

Now would be a good time to scrap that antique obsolete C950 EFI system and get something more modern, like a Holley HP or Terminator X.

I've thought about that several times. In fact, I looked at them recently and I may upgrade in the future. For now, I want to get this thing running. I think I can wire it up using my existing sensors and maybe the existing harness. I've looked at the wiring diagrams for them and they're very similar to the C950. Problem is the size of the ECU and where to put it.

[chevynut]

Now would be a good time to scrap that antique obsolete C950 EFI system and get something more modern, like a Holley HP or Terminator X.

I've compared the HP EFI and the Terminator X and don't know which is really a better choice. Looks like the HP EFI connects to a laptop via USB but the Terminator X doesn't and uses a small display. The latter has a bunch of LEDs that are useless if the unit is buried in the console. Both use the same harness.

You're right now would be a good time to change the engine harness out if I need to. The newer units have 8 separate injector wires, but they still batch fire unless you add a cam sensor which I don't plan to do. The Terminator X also uses Bosch 4.9 O2 sensor versus HP with the Bosch 4.2 or NTK sensor. My current one is a Bosch 226R61 part number which I can't find anywhere, and I assume a 4.2. I read that the 4.9 is a better sensor.

Which do you think is the better choice?

[Rick_L]

Terminator X can use a laptop as well as the small hand-held display. I'd think the hand-held would be pretty useless except for the simplest tasks.

Everything I see is that the Bosch 4.9 is the better sensor. Most of the newer systems use the 4.9 rather than the 4.2, also the newer AFR gauges and meters do too.

I'm going to guess that even if the wiring diagram is the same point to point for some functions, the connectors will be different.

From what I know, the Terminator is less expensive. The HP has more features and is more versatile, but you may not need any of that, probably don't.

It may be easier to wade through the details and make sure you order all the right stuff by working with a dealer rather than direct with Holley. Pricing should be the same or similar.

[chevynut]

[QUOTE=Rick_L;67963] Everything I see is that the Bosch 4.9 is the better sensor. Most of the newer systems use the 4.9 rather than the 4.2, also the newer AFR gauges and meters do too. ='[/quobgte]

Watched a video where a guy said the 4.2 sensors last longer (see below). I think that's what I already have.

https://www.youtube.com/watch?v=jKSDyIwYDD0

I'm going to guess that even if the wiring diagram is the same point to point for some functions, the connectors will be different.

Yes some connectors are different, except on the engine. All of my TPI sensor connectors are the same as their TPI harness. So pretty much everything is the same from the firewall forward. The injector harness connector is different but it doesn't have to be. Coil wiring is the same.

From what I know, the Terminator is less expensive. The HP has more features and is more versatile, but you may not need any of that, probably don't.

Less than half the price. $1600 vs $700 just for the ECU.

One nice thing about it is that I can eliminate my ESC and the WBO2 controller. Knock sensor wires straight into the ECU as does the WBO2. Overall it might be a pretty easy upgrade if I can make the box fit.

[WagonCrazy]

The challenge with building a high end car like your Nomad is that it can only incorporate the technology available at the time of the build. So going forward in time, modern upgrades will eventually cause some aspect of it to be "dated".
I'm with Rick L here...if you are at all frustrated with the C950 efi setup, then it's already considered "dated" by todays standards.
And since you aren't yet driving the car (meaning..its not yet finished), then now's the time. You'll definately not want to do surgery on it later on.
So bite the bullet now and upgrade to today's technology. It won't hurt the value of it later on when its time to sell (vs the C950 system being in it).
And we all know it's a never ending game of upgrades if you try to keep up with it over the years.

I don't have a cat in your game here, so I can easily spend your money with suggestions. But my hunch is that you probably should consider swapping for a new ECU system now, while its accessible. Consider putting the hardware somewhere in the interior under your back seat or in the center console.

Just my 2 cents here.

[Rick_L]

I really doubt that the HP or Terminator X ecu is substantially bigger than the C950. I'd expect the opposite.

[chevynut]

QUOTE=WagonCrazy;67965]if you are at all frustrated with the C950 efi setup, then it's already considered "dated" by todays standards.='[/quote]

It's not so much that I'm frustrated with it. It seems to work fine and hasn't caused any of my problems. However, I only have one old PC that it runs on and it won't run on anything past Windows XP. I also know the self-learning is a big deal.

And since you aren't yet driving the car (meaning..its not yet finished), then now's the time. You'll definately not want to do surgery on it later on.
So bite the bullet now and upgrade to today's technology.

I agree that now is the time since I have to pull the upper intake anyhow. All the wiring is under it. I didn't want to do it before since it was a big step backwards in the project.

I don't have a cat in your game here, so I can easily spend your money with suggestions. But my hunch is that you probably should consider swapping for a new ECU system now, while its accessible. Consider putting the hardware somewhere in the interior under your back seat or in the center console.

It's not really about the cost. It's about the constant re-doing of stuff I've already done that's kept me from doing it. My C950 is under the console box. I want to put the new ECU there but I have to see if it will fit. I'd prefer under the rear seat however the harness isn't that long. They do sell a 15' do it yourself un-terminated harness that should work but it's a lot more work to install it.

[chevynut]

I really doubt that the HP or Terminator X ecu is substantially bigger than the C950. I'd expect the opposite.

The C950 is about 5"x5 1/2"x2" and the HP EFI is 7 1/4"x 5.3" not counting the mounting ears. It's 8.5" long including the ears. The Terminator X is smaller at 4.1"x7.45" The length is the biggest concern. I can modify the console box if needed This is where the C950 is mounted.

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I'm trying to get info on the length of the harness to see if it will reach. I have nowhere to put it further forward.