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Bockscar
Joined: 16 Nov 2010
Posts: 392
Location: Sandy, Oregon
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 Posted: Sat Dec 18, 2010 3:26 pm Post subject: Vacuum advance on distributor? |
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Hey guys,
When I bought my car, it came with a brand spanking new, but incomplete engine. What I mean by incomplete is that the engine itself was bolted in, but none of the electricals and very few of the vacuum hoses were hooked up..
I know that the NA engine has a vacuum advance on the distributor but, does the turbo engine have one? If it does, I need to find one because my engine is missing it  |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Sat Dec 18, 2010 5:16 pm Post subject: |
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Putting the year of your car in your signature (under Profile) will get you more accurate responses.
My 1980 has a vacuum unit with advance (from throttle plate) and retard (from manifold vacuum. . .actually tapped from brake booster line).
If your vacuum sticker is missing I can shoot you a photo of mine.
_________________
Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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Bockscar
Joined: 16 Nov 2010
Posts: 392
Location: Sandy, Oregon
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| Posted: Sun Dec 19, 2010 2:44 am Post subject: |
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| Rasta Monsta wrote: | Putting the year of your car in your signature (under Profile) will get you more accurate responses.
My 1980 has a vacuum unit with advance (from throttle plate) and retard (from manifold vacuum. . .actually tapped from brake booster line).
If your vacuum sticker is missing I can shoot you a photo of mine. |
Whoops! I spaced that.. Fixed it now though!
According to the Haynes manual (albeit, the last 8 pages of it), my particular engine appears to have a 'Direct Ignition Timing Control' system which means it uses a hall sensor on the flywheel instead of a vacuum advance.
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Brian
'79 924 - Restoration In Progress
'81 924 Turbo w/EFI - Scrapped |
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jbwheele
Joined: 09 Jun 2010
Posts: 72
Location: Invercargill New Zealand
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| Posted: Mon Apr 18, 2011 6:39 pm Post subject: thanks |
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Hey I think this just answered my new post Ill tap ma line from manifold vac to the retard side of dizy unit ! 
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Joe
82 932 Stripped bare full rebuild
80 932 GT Lookalike Engine S2 swap |
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Smoothie
Joined: 01 Jan 2003
Posts: 8032
Location: DE (the one near MD, PA, NJ)
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| Posted: Tue Apr 19, 2011 1:30 am Post subject: |
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'81-up 931s with DITC have a vac line to the DITC box that provides vac/boost level info for processing. DITC takes that, and the crank sensor signal, and intake air temp, then figures out how much spark advance or retard...
Not seeing the Vac line to DITC here, but as I recall it originates somewhere near "H" (the CSV) -
<click>
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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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