Greddy EGT Gauge

[Sydneykid]

Hi guys, I need some help, I picked up a used Greddy exhaust gas temperature gauge yesterday. It's the current style with the separate controller and gauge with max reading recall and adjustable preset warning.

As usual, no instructions, so I need help with the wiring. It has 3 wires going to the control box;

1. black (I assume earth)

2. red (I assume switched active)

3. white (I assume switched light for the gauge)

But I am too chicken to connect it up in case I am wrong, too expensive to blow up by getting the polarity around the wrong way.

So does anyone have a manual, wiring diagram or remember when they wired their's up?

[BOOSTD]

Sounds right however Red could be constant otherwise memory would be lost. May have an internal battery. Easy to test. Polarity is definately right.

[GTS-t VSPEC]

Sydneykid, Sounds right to me, but I'm sure the internal circuitry will handle you testing the gauge, it won't blow up if you get it wrong.

[Sydneykid]

Thanks guys, I won't have time to fit it until the weekend after this, too much important racing on this weekend. So I figured I'd just ask around, there must be someone who has fitted one that knows for sure.

[BOOSTD]

It will blow up if you get it wrong!!!!! I am an electronic tech, Trust me don't go connecting wires differently to the above, or you will let the smoke out.

[Steve]

Originally posted by BOOSTD

.....Trust me don't go connecting wires differently to the above, or you will let the smoke out.

[2rismo]

Can you please explain the type of application where an EGT guage might be useful?

Thanks Sydneykid,

Adrian

[Sydneykid]

Hi 2rismo, excessive exhaust gas temperature is a good warning of too lean mixtures. I can tune the car on the dyno with the fast and wide lambda sensor plugged in and know the A/F ratios are OK and what the max exhaust gas temperature it is runing at (say 700 degrees C). I then set the alarm on the EGT for slightly higher than that (say 720 degrees C). If for some reason the car leans out (stuf like fuel pump failure, dicky injector, blocked filter or bad batch of fuel) then the alarm goes off and I save an engine.

There are other uses, but that's my main one.

So anyone got a wiring diagram or personal experience?

[adam 32]

ive got an older series GReddy EGT which has a black ground wire, red power/light wire and 2 sensor input (green and yellow) wires...

but i dont think that helps any great deal

[2rismo]

Ahh... thx Sydneykid. Thought so but wasn't sure. Better indicator than knock sensor in car/pfc? I think it might be less prone to showing false positives for pinging etc...

Thx again,

Adrian

[Sydneykid]

Hi 2rismo, you asked "better indicator than knock sensor in car/pfc?"

Not really better, but definitely a good support, you can get knock without too much excessive EGT and vice versa. Plus the EGT is a good indicator of exhaust valve condition. A "burnt exhaust valve" is really a "burnt" exhaust valve, if you get my meaning. The temperature to "burn" it ended up in the exhaust and the EGT sees that, but there may be no knock.

Hope that makes sense

[2rismo]

Totally. Thanks very much. Just so as I get the most mileage out of picking your brain, is there a general rule of thumb of what, say,My Car should read on an EGT guage?

Thanks again!

Adrian

[T0nyGTSt]

Prob. is EGT is expensive.

Maybe $500 for an Apex'i EL.

Maybe $300 for an Autometer.

The 900-1,500c sensor is expensive.

T.

[Sydneykid]

Hi Guys, I picked up the Greddy for $195, I missed one a couple of weeks ago so they do come up from time to time. Juts have the cash available, be ready and move swiftly, they sell quickly.

As for temperature in your car 2 rismo, you have standard turbo is that right? Then I would recon on not much over 600 degrees C for too long, maybe 700 max.

[Nu2skylines]

I love my Greddy EGT on my turbo integra. I know it's off usually by a hundred or so degrees but it's better than nothing. The reason for this is because the indicator can not take readings as fast as the gases are coming out so you sometimes get a delayed response. I'm not sure which runner in skylines run the hottest but hondas tap into the 3rd runner usually. By the way, a friend had pretty much the same set up as me with an Autometer EGT and it took longer to read. I hooked it up to my car and the same thing happened. Good choice on the Greddy EGT. Good luck hooking it up.

My EGT:

Black = ground

Red = constant

White = light

I think my EGT is about 2 years old though.

Good luck.