🔧 BUILD PSJ's 1967 LS Turbo Camaro Build

[Turbocharged400sbc]

I have like 20 of the omron/delphi 70 amp, 10ga OEM relay setups in with all my metripack stuffs if you want to fix it right away.

I never find the tyco relays in parts stores.... At least some of them stock the seventy amp OEM relay....75$ each.

If you look up plow parts you can find the solenoid style relays that are constant duty.

 

[Pro Stock John]

Thank you mister, I have new relays here but will keep those in mind.

 

[Turbocharged400sbc]

Also see if he'll set you up with some double redundancy. My critical stuff has backup relays wired in parallel. Fuel pump, dual 40amp omron metripack weatherproof, coolant fans-dual 70amp.

Also packard/delphi are full of s*** when they say that the metripack 150 (1.5 millimeter blades) can handle up to 14 amps.

Even 280s have voltage drop at 14amps.... And I never even tested them at the nearly 200ﾟ under hood temps that they normally see.

All that fan stuff better be using 630 or larger 800s

 

[Pro Stock John]

Fan worked on the test drive I just did.

 

[strtcar]

Also see if he'll set you up with some double redundancy. My critical stuff has backup relays wired in parallel. Fuel pump, dual 40amp omron metripack weatherproof, coolant fans-dual 70amp.

Also packard/delphi are full of s*** when they say that the metripack 150 (1.5 millimeter blades) can handle up to 14 amps.

Even 280s have voltage drop at 14amps.... And I never even tested them at the nearly 200ﾟ under hood temps that they normally see.

All that fan stuff better be using 630 or larger 800s

Not to hijack thread but how do you wire up double redundancy?

 

[LikeABauce302]

Not to hijack thread but how do you wire up double redundancy?

Just wire 2 relays in parallel. I did this for my fuel pump. Just connect the 2 power out wires from the relays to your one power input wire on your fan, fuel pump, electric water pump, or whatever it is you're powering.

Here's a basic auxiliary relay board I made awhile ago. If you look closely, you can see the 2 power out wires from the 2 relays on the right go to one terminal.

 

[Turbocharged400sbc]

Separate fuses separate power wires separate grounds all the way back to the battery with usually an auxiliary ground to the chassie nearby.

I live for finding the oem maxifuse blocks... These things are nearly fusable links in slowness to blow and minimal voltage drop AND you can get self resetting 20'30'40'50 amp Breakers that plug right in.

i chop the harness as far away as I can to get every inch I can of the sweet 10 and 12 gauge goodness of 90s gm Oem wiring When copper was cheap and the bean counters minimal

Bonnie's, park Aves, oh baby I'm clubbing just thinking about it

Ato n minifuses are control side hardware in my book.

An old timer showed me this, he'd wire in a light bulb between the 2 relay outputs so that if one relay died the light bulb would light up Indicating a relay had failed

he made the point that 1 relay is always gonna be a little slower than the other and that relay will probably live a really long life and never have any issues as well as the least voltage drop while the other takes the brunt of the kick before current drops by half upon arrival of the slow guy.


You can do the same thing nowadays with one of thoselights up when blown fuses that you see in the part store. Just get a small 1 amp one that'll pop right away and turn on the little red LED light.

I don't do that, I just clamp on a Current probe And pull each fuse in turn before I go beating on it.

The turbo regal is actually a little stupid as it actually has three relays in parallel for the fuel pumps

Most of this stuff is becoming a moot point nowadays with the centralized power systems and solid state relays they have.

But then I look at how so many cars nowadays. I end up throwing away an entire component because only a small portion of it failed and I really don't like those odds.

I'll stick with hardwired redundancy and electromechanicals

 

[Turbocharged400sbc]

Wiring is easy

 

[Turbocharged400sbc]

Hey john Before I forget do you know whether The alternator is referencing remote voltage or is it just local reference and PCM field control?

I know the Bosh alternators were controlled differently but the Delphi Delco alternators, some you could have the regulator reference voltage remotely (even battery temp) and I recommend running that wire to the power in on the secondary side of your fan relays instead of batt +..... That will let it regulate better under the load transition.

 

[Pro Stock John]

Hey john Before I forget do you know whether The alternator is referencing remote voltage or is it just local reference and PCM field control?

I know the Bosh alternators were controlled differently but the Delphi Delco alternators, some you could have the regulator reference voltage remotely (even batter temp) and I recommend running that wire to the load side of your fan relays instead of batt +..... That will let it regulate better under the load transition.

I don't the answer to the first question.

I can eventually look into your suggestion.

 

[Turbocharged400sbc]

Look at the small wire electrical connector on your alternator and see if it has 1, 2 or 3 Small wires, red, orange and tan or purple possible.

The regulator should have all four pins even if the connector does not

 

[Pro Stock John]

Off memory it's a 1 wire alternator.

 

[Turbocharged400sbc]

Oldschool 12si? On an lsx? Ya shure?

 

[Pro Stock John]

one wire

 

[Pro Stock John]

Oldschool 12si? On an lsx? Ya shure?

I can take a picture if you like lol.

 

[Turbocharged400sbc]

Please do, also a pic of the two terminal recess near the regulator/ one wire connection.
A lot of one wire alternators Have the connections on the regulator To allow remote sensing.

 

[Pro Stock John]

Hope this answers your question, I'm not very knowledgeable about wiring. This setup with my underdrive crank pulley charges good.

 

[Pro Stock John]

Fixed the fan, really just swapped out the relay for a slightly higher rated one. Now I can address the driveline vibration issue.

Oh wait.

I was seeing really low and negative oil pressure readings when I last drove the car, 6 at idle and -2.7 cruising. Tried a new Napa oem sensor (had oem in the car before) and that and a Lowdoller both show up 0 on my dash but engine again sounds fine.

First thing I will do is swap in a new AC Delco reccomended PN sensor, and try that. If it's reading 0 at the dash, then I m going to use a mechanical pressure gauge to check the pressure from the engine, and also use some compressed air aimed into the hole in the sensor to test stuff. A few buddies think it's wiring. I'm not really sure at this point.

On the positive I get to learn some new stuff.

 

[IceCreamAssassin]

Hate that shit, always scary seeing low oil pressure

 

[Pro Stock John]

I'll know by Saturday if it's the engine or the wiring. If it's the engine oh well, it's a $500 LM7 SBE and I have all the parts to build a forged LC9. I hope it's not the engine I'd like to blow it up first with 20 lbs of boost and then swap it.

 

[sktchy]

If it went negative I'd just start chasing that wire down now because it's probably shorted somewhere.

 

[Pro Stock John]

That's encouraging thanks brochacho.

 

[sktchy]

Oil pressure circuit is pretty simple. There's two or three wires. Ones a ground. Another is a 5v reference. You want the 5v wire. 9 times out of ten inspecting the coating on the wire will tell you all you need to know. Look for rub spots in the loom or tight turns, kinks, burns etc. I doubt this issue comes down to needing to break out a scope and pinouts of your pcm.

 

[sktchy]

If it was just a 0 I'd say look at the ground but if it went negative it shorted before it got there.

 

[Pro Stock John]

Well:
1- try one more sensor, gennie AC Delco part
2- it was still 0, will screw in mechanical gauge and run it, It used to make well over 30 at idle, so I'd hope for something like that
3- blow compressed air into the sensor hole, what do you think about that?

That's my plan, step 1 will take 3 minutes.

Wiring might be a little bit of a bish on my car, the oil sensor wiring is part of a holley harness.