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SprintStar
Joined: 26 Aug 2003
Posts: 150
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 Posted: Sat Nov 22, 2003 10:55 pm Post subject: Alternative? |
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| Smoothie wrote: | Actually it's attached to the same line that happens to lead to the brake booster and this works fine. To screw things up you could do something like attach downstream of either of the check valves you see in the picture (the pale blue pieces seen to the right). The connections shown are upstream of all check valves and amount to a direct connection to the intake manifold.  |
I just saw a pic of the DITC box behind the radio. Looks like there's a vaccum line to it. Can we tap from it? After all, it's a lot closer to the center console where the gauges are mounted.
Sprint. |
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SprintStar
Joined: 26 Aug 2003
Posts: 150
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| Posted: Wed Nov 26, 2003 2:44 am Post subject: An idea! |
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| numbbers wrote: | | The best place to measure boost is the port for your overboost pressure switch. |
Hello Numbbers! How about using the link to the DITC unit behind the radio? I believe a line can be tee'ed off from there? Won't that be closest to where the gauge would be?
Just a thought.
Sprint. |
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u000533
Joined: 30 Sep 2003
Posts: 17
Location: Bristol, UK
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| Posted: Wed Nov 26, 2003 4:38 am Post subject: |
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If you want a nice easy install, use the small tube on the side of the throttle housing.
http://www.rockseven.com/porsche_924_turbo/boost.jpg
Cut the tube, insert a t-piece, you can pass the tube from your boost gauge through next to the engine wiring.
Its how I've connected my boost gauge and turbo timer and they both work perfectly.
regards
Mike.
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1981 931 turbo - sadly sold |
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numbbers
Joined: 05 Nov 2002
Posts: 1910
Location: Highlands Ranch, Colorado
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| Posted: Wed Nov 26, 2003 11:18 am Post subject: |
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Sprint, I have an '80 so I don't have the DITC unit. Can't help you there.
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1980 924 Turbo |
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SprintStar
Joined: 26 Aug 2003
Posts: 150
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| Posted: Wed Nov 26, 2003 10:05 pm Post subject: |
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| u000533 wrote: |
Its how I've connected my boost gauge and turbo timer and they both work perfectly.
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Does this affect the turbo timer?
Sprint. |
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SprintStar
Joined: 26 Aug 2003
Posts: 150
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| Posted: Wed Nov 26, 2003 10:05 pm Post subject: |
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| numbbers wrote: | | Sprint, I have an '80 so I don't have the DITC unit. Can't help you there. |
Hehe.. Thanks anyway, Numbbers! You are a great asset to this board! 
Keep it up!
Sprint. |
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u000533
Joined: 30 Sep 2003
Posts: 17
Location: Bristol, UK
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| Posted: Thu Nov 27, 2003 2:47 am Post subject: |
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As far as I'm aware it doesnt affect the turbo timer, as long as it has a pressure signal it calculates run down time for the engine.
It seemed like the easiest place to connect in and get a reading.
regards
Mike.
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1981 931 turbo - sadly sold |
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Smoothie
Joined: 01 Jan 2003
Posts: 8032
Location: DE (the one near MD, PA, NJ)
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| Posted: Thu Nov 27, 2003 2:59 am Post subject: |
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Someone with a hook-up like numbbers has could verify this, but I recall hearing that tapping off a point before the throttle shows boost spikes that occur in the piping between the turbo and the throttle each time the throttle is closed quickly. This would be a different effect you'd get hooking up before instead of after the throttle. If you have just a boost gauge, it could be hooked up either before or after. A combo boost-vacuum gauge would have to be hooked up after the throttle to include the vacuum reading.
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"..it's made in Germany. You know the Germans always make good stuff."
'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox |
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numbbers
Joined: 05 Nov 2002
Posts: 1910
Location: Highlands Ranch, Colorado
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| Posted: Thu Nov 27, 2003 10:49 am Post subject: |
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Yep, I see the boost spikes, they will peg the meter. Also, you are right, I don't see vacuum on my guage, only boost. Of course, since I use the guage to ajust my boost controller, that is what I am interested in.
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1980 924 Turbo |
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SprintStar
Joined: 26 Aug 2003
Posts: 150
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| Posted: Fri Nov 28, 2003 11:07 am Post subject: |
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| u000533 wrote: | As far as I'm aware it doesnt affect the turbo timer, as long as it has a pressure signal it calculates run down time for the engine.
It seemed like the easiest place to connect in and get a reading.
regards
Mike. |
Gosh.. This is advanced! How does the turbo timer decide the run down time? Mine is just a swtich for either 1 or 3 mins. I'm interested in getting one like your so I don't have to bother to crack my head over it....
Thanks.
Sprint. |
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924 FAQ (Technical)
