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Discussion Starter #1
I just wrote this up again at Supraforums and I though some of you might want the info, so here it is:

If you're converting kg/cm^2 (on the GReddy gauges and other brands as well) here are the factors so that you can do it by sight (from http://xtronics.com/reference/convert.htm):

1.0 kg/cm^2 = 14.223 psi
1.0 psi = 0.070309 kg/cm^2
1.0 bar = 14.508 psi (this means that 1.0 bar != 1.0 kg/cm^2, but is close)

0.8 kg/cm^2 = ~11psi = stock boost on a JZA80
~1.15 kg/cm^2 = 16psi (max boost without detonating on 92 octane on JZA80)
~1.25 kg/cm^2 = 18psi (typical boost people run on 100 octane on JZA80)
 

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Thanks, Chris. I just bought Greddy Boost and Fuel Pressure gauges for the Spearco. Should be here soon! Pretty sure my Blitz EBC is also in metrics, so this will be very helpful.
 

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DOH!!!!

The Spearco Boost guage is going away, huh??????

When Mike Wilkes still had it & I drove it a few times, it was never a gradual buildup of the needle... And I never saw the guage go into the negative/vacuum side... I always thought that seemed rather odd...
 

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The Spearco gauge works fine for me....now. It usually sits at 20-22 inches of vacuum at idle and has been going up to around 6 psi of boost when I get on it. Boost comes on Very fast in this car at 2500 rpms. Last year, Josh Brower and I pulled out a grocery bag full of "extra" wiring from various alarms and stereo installations. The car had all kinds of wiring problems, lights that didn't work, accessories that didn't work Everything works now, cept for the cruise, which I will eventually get figured out.

I wanted matching gauges and I wanted something that was backlit green at night to match up with the stock cluster. I am finally getting around to installing the dual guage pod from Lo-tek. Now I have to figure out where I am going to mount the Blitz EBC.
 

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Discussion Starter #6
Glad this is helpful.

Wade -- where will you be installing your EGT gauge? Everything that I've read is that the best place is in the 6th runner...
 

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quick said:
Glad this is helpful.

Wade -- where will you be installing your EGT gauge? Everything that I've read is that the best place is in the 6th runner...
Yesir, #6 is the one going to be tapped. It would be cool to eliminate the EGR system and use the EGR bypass in the 6th exhaust port. But the manifold should work ok too.
 

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Discussion Starter #8
I was planning on going with an EGT gauge as well, but then I learned that it wasn't really going to give me what I was looking for...

http://www.sdsefi.com/techegt.htm

Basically (not that you asked) I'd suggest nuking the EGT gauge and going with an FJO or something... If you got GReddy gauges you should be able to sell it for a decent price and put the money toward a wideband or something of that nature...

JMO. HTH.

Not trying to tell you what to do -- just trying to understand what you're looking for with such a gauge and determine if you're going to get what you're looking for.
 

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I got my Lambdaboy Wideband O2, Blitz EBC, and Greddy guages in the mail today. Mailman was very popular today.

They made a mistake on my guages. I ordered the Boost and Fuel Pressure guages, they sent me EGT and Boost guages.

I had wavered back and forth whether to purchase an EGT or a fuel pressure guage...so I am wondering if this is a sign???

I have the wide-band O2, so I don't know if I have much use for the EGT. I haven't called them yet to tell them they screwed up. I am leaning towards sending the EGT back.

Any comments?
 

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Discussion Starter #10
Send the EGT back. With a true wideband (not a cheapie A/F sensor and gauge) you don't need an EGT gauge and it won't help you.
 

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My thoughts exactly. I contacted them and I will be exchanging for the Fuel Pressure Gauge. I can't wait to get everything wired in to see how far I can push the boost!!!
 

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Discussion Starter #12
Btw, I think that the fuel pressure gauge is a great idea.

Oil temp and pressure would be good too.
 
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