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mark houghton's Avatar
 
Join Date: Jul 2008
Location: Central Washington State
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What's that gauge??

Just wasting my evening, lurking about on YouTube, and came across this one video of some dude running hsi 930 hard on a track...and I noticed this gauge (in the stock clock location) with two indicator needles swinging in conjunction with each other. What is it....a combination boost/AFR gauge? Never seen one before. Any ideas, and where can I get one. Even if you're not going fast, all the needles swinging around get your adrenalin pumping.
http://www.youtube.com/watch?v=0NEH5di4Yds

Old 01-18-2009, 06:47 PM
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Answer

This is his boost gage. The needle that is stationary is either how high the boost has been or a marker for him to know not to go further than he should.
Old 01-18-2009, 06:50 PM
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I think he has one needle that lags behind the other one. Likely it is reading boost, both before and after the throttle plate. The lagging one being after the throttle plate or in the intake manifold and the other before the throttle like in the intercooler somewhere.
You can see them reach the same value at wide open throttle which makes sense.
My engineering guess.
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Old 01-18-2009, 07:20 PM
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That is one sick car and some serious driving by the way.
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 01-18-2009, 07:21 PM
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That's a neat video. He is making some real time on the straights and not bad in the corners either.
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Old 01-18-2009, 08:00 PM
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That 930 is retardedly quick FWIW
Old 01-18-2009, 08:10 PM
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That's Jim2's car...I think. Pretty impressive DIY story!!!! Very impressive car!

His build:
930 EFI Conversion in process

About the gauge:

Quote:
Originally Posted by Jim2 View Post
Jeff, it's a twin engine aircraft gausge. It was discussed a couple pages back. In the video it's hooked up above and below the butterfly. It works good for measuing pressure loss across the I/C and throttle body. Gauge limit is too low for reading fuel press.
and

Quote:
Originally Posted by Jim2 View Post
Hi guys, the gauge belongs to a friend, though it's on long term loan and now resides in my clock opening. Same diameter as the clock!

I was told it's a WWII bomber gauge. This one is a twin indicator as Cliff noted, for a two engine plane.

Apparently the WWII bombers ran some pretty high boost numbers. Gauges went up to about 90".

Source? I have no idea, but I did find some on ebay which needed rebuilding. Also was told there are some aviation instrumentation shops which carry antique gauges. Perhaps a web search and some phone calls will put you onto a supplier.

I like the absolute format for accurate actual boost indication. In this case having twin indicators has allowed me to do some interesting testing regarding restriction of the throttle body, as well as the intercooler (yet to be done). You can do this with conventional gauges, but this gauge is more accurate. This one was calibrated several years ago so should it should remain accurate.

Jim

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back in the saddle: '95 993 - just another black C2
*SOLD*: '87 930 GP White - heroin would have been a cheaper addiction...
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Last edited by sand_man; 01-19-2009 at 08:37 AM..
Old 01-19-2009, 07:04 AM
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