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fwood
Joined: 26 Apr 2010
Posts: 40
Location: Yadkinville,NC
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 Posted: Tue Feb 10, 2015 12:44 pm Post subject: Boost gauge connection |
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Would it work to connect a Vdo vacuum/boost gauge with a t fitting to the control line to the ditc unit.
Frank |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Wed Feb 11, 2015 3:43 am Post subject: |
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If that control line is manifold vacuum, yes.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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jason c
Joined: 13 Jan 2014
Posts: 1018
Location: Nwi
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| Posted: Wed Feb 11, 2015 6:26 am Post subject: |
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| You can if you have the small gauge. I'm not sure that that line is big enough for the larger 935 style gauge. The DITC control may also have a delayed reaction from the extra line added that it must fill before full pressure reaches it. The dealer installed boost gauge kits tied in to the manifold or upper pressure duct with its own dedicated line. |
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fwood
Joined: 26 Apr 2010
Posts: 40
Location: Yadkinville,NC
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| Posted: Wed Feb 11, 2015 9:55 am Post subject: |
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Thanks for that input. I got a small gauge to go in place of the inoperative clock and thought that putting a T in the cabin next to the ditc would be low impact. I did not want to try to machine another access point on the intake path. Just wanted to see boost in action!
Frank |
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jason c
Joined: 13 Jan 2014
Posts: 1018
Location: Nwi
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| Posted: Wed Feb 11, 2015 10:02 am Post subject: |
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| You can get a longer bolt & put 2 eyelets on it, one for DITC & one for the gauge. No machining needed. |
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fwood
Joined: 26 Apr 2010
Posts: 40
Location: Yadkinville,NC
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| Posted: Wed Feb 11, 2015 10:09 am Post subject: |
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Where do you get those?
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Frank Wood
82 931 |
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fiat22turbo
Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR
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| Posted: Wed Feb 11, 2015 10:30 am Post subject: |
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| fwood wrote: | | Where do you get those? |
Lindsey Racing sells them, but anyplace that carries barbed metric banjo fittings
http://www.lindseyracing.com/LR/Parts/944INTMANMISC.html
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose) |
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jason c
Joined: 13 Jan 2014
Posts: 1018
Location: Nwi
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| Posted: Wed Feb 11, 2015 10:54 am Post subject: |
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| You'll need 3 crush washers too. |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Wed Feb 11, 2015 12:46 pm Post subject: |
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| fwood wrote: | | I got a small gauge to go in place of the inoperative clock and thought that putting a T in the cabin next to the ditc would be low impact. |
Absolutely zero wrong with doing it that way.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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DZGunner
Joined: 18 Nov 2014
Posts: 191
Location: Great white north
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| Posted: Wed Feb 11, 2015 2:13 pm Post subject: |
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| sorry but what does DITC stand for, thanks |
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jason c
Joined: 13 Jan 2014
Posts: 1018
Location: Nwi
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| Posted: Thu Feb 12, 2015 2:17 am Post subject: |
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| DZGunner wrote: | | sorry but what does DITC stand for, thanks |
Digital Ignition Timing Control. Its used on 1981-on 931.
The control unit controls the ignition timing & has the ability to change timing based on boost pressure. There is a pressure switch in the control unit that is fed intake vacuum/pressure via a hose from the intake.
Fwood would like to tap into this line for a boost gauge. |
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DZGunner
Joined: 18 Nov 2014
Posts: 191
Location: Great white north
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| Posted: Thu Feb 12, 2015 3:34 am Post subject: |
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| Oh, makes sense. I have an 80 and am doing the same, it's just I put a T in one of the lines that is before the venturi tube. The big elbow connected Directly to the manifold on the top (the only one) leads right to the one I T'd into so I think it should work. |
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jason c
Joined: 13 Jan 2014
Posts: 1018
Location: Nwi
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| Posted: Thu Feb 12, 2015 4:21 am Post subject: |
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Any line that is connected to the intake & is large enough to supply the gauge will work. The small vdo gauges don't need a large supply line. You will not get a vacuum signal if its before the throttle body though.
The reason I cautioned about tapping into the DITC line is because the line supplies a pressure switch in the DITC that determines the timing advance/retard based on boost pressure. A bleed off from that line may affect the reaction time of the DITC.
Your car does not have this line or DITC. |
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