Wire harness thru firewall ideas ?? - Page 3 - Lateral-g Forums

HWYSTR455 · #21 12-12-2007, 10:16 AM

Garage Dog 65 - I'll take you up on that! I have a complete pinout of the FAST XFi box, and have done considerable amount of background on that. I know that a number of the leads in my case will not be used, and personally, I would prefer to use the smallest connector needed. REGARDLESS, I would be happy to use one that accounts for all the leads, just out of convenience.

The best scenario would be to use a 'mixed' connector, that accounts for the correct number of leads for the correct gauge wire. THAT will take going down the schematic and counting the gauge/pin/lead thing and recording. Not particularly difficult, just needs to be done. It may not be feasible to do in one connector.

As for which ECU, let me say this. All have a basic number of required sensors and drivers, correct? Like TPS, Water, IAC, ATS, Crank trigger, Cam trigger, etc. One could account for these and create a pass-through config that would generally account for most, if not all ECUs. One's that require more, like trans or whatever, could use an additional bulkhead. Just a thought...

When I get home I'll post the pinout on the FAST. Garage Dog 65, I'll be more than willing to help in any way I can, though I'm sure some have already done what we're talking about, would be nice if they anti-up, wouldn't it?

HWYSTR455 · #22 12-13-2007, 05:31 AM

Ok, here's the main harness & injector harness schematics. There are a number of options that can be used as well, which require more leads, but this is the basic. To get a better understanding, download the CComp software from FAST and install it. It creates a directory that contains ALL the schematics, including all options. The schematics are in PDF, and as a jpg, larger that I can post here, which is why I suggest the download. Hope this helps some!

Garage Dog 65 · #23 12-13-2007, 06:14 AM

Here are the PCM pinouts for my 2002 LS1 PCM from a vette. 2 connectors with 80 slots each - but many aren't used.

I don't have a harness yet - so I left the gauge column open for later. I asterisked the items I felt should be in the bulkhead connectors. Looks like we could easily get 2 bulkhead connectors with enough capacity - even if we break them into power/servo and sensor.

Jim

HWYSTR455 · #24 12-13-2007, 06:42 AM

Excellent! Ok, I think if one or two bulkhead connectors were identified and a source for them, all could use them as they choose. Maybe three would be the way to go, since some may want to use only one total bulkhead for all the leads. I think a 48-pin for a total would work, but would have to look again to be sure.

I looked at some of the connectors yesterday, there were ones that were waterproof, and oil/fuel proof that had enough pins.

**V8TV** · #25 12-19-2007, 09:23 PM

How about these weatherpack bulkheads?

http://rjminjectiontech.com/?p=12

bigtyme1 · #26 12-19-2007, 10:28 PM

Quote:

Originally Posted by V8TV

How about these weatherpack bulkheads?

http://rjminjectiontech.com/?p=12

I like this one, but is enough pins?

HWYSTR455 · #27 12-20-2007, 05:19 AM

Nope, would probably have to do 3 of them, and don't think they're RF insulated within the connector....

dhutton · #28 12-20-2007, 06:01 AM

Quote:

Originally Posted by HWYSTR455

Nope, would probably have to do 3 of them, and don't think they're RF insulated within the connector....

OK, why do you need RF shielding within the connector if all the rest of the cable in the harness is not RF shielded? I don't think this is necessary and it doesn't gain you anything.

Don

HWYSTR455 · #29 12-20-2007, 06:46 AM

Some do have shielding, and there's also a dependance on the resistance of the conductor as well. I don't recall off the top of my head which, but once I revisit this area I can post. I just kept a mental note that it was required, though it's possible I could be wrong on that. Certainly two I know of are crank & cam sensors. Guess that might be only an issue if you mount the CD box inside...

dhutton · #30 12-20-2007, 07:09 AM

Quote:

Originally Posted by HWYSTR455

Some do have shielding, and there's also a dependance on the resistance of the conductor as well. I don't recall off the top of my head which, but once I revisit this area I can post. I just kept a mental note that it was required, though it's possible I could be wrong on that. Certainly two I know of are crank & cam sensors. Guess that might be only an issue if you mount the CD box inside...

I agree that some connectors do have shielding. I just don't think it does anything since all the wires in the harness are not shielded. Any interference or RFI etc will happen in the harness regardless of what you do with the connector. I think you would need to use shielded wires in the harness before a shielded connector would have any significant impact on performance.

Don