924Board.org

[Fasteddie313]

80 931..

I'm going to the speed shop in about 2 hours to get my timing set up/confirmed because they have the tools and I don't.. I want to make sure my timing is correct before I start raising boost..

Should I run my timing a bit retarded if I'm planning on raising boost above stock levels for a safety net? How much?

If no one answers before I go I'll just set to factory spec.. Any advice?
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80 Turbo - Slightly Modified

[ideola]

I have run up to 15 psi of boost on my "941" using factory ignition system. The car is not exactly stock (8.3:1 CR diamond pistons with Crower long rods, ported head, and water-meth injection for intercooling). I typically leave the boost controller set to 11-12 psi, but on really cold or wet days have turned it up to 15 psi with no ill effects or audible pinging.

I firmly believe the car would benefit from additional ignition tuning, but the stock system has been rock solid with almost two full seasons of driving.

YMMV.
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erstwhile owner of just about every 924 variant ever made

[Fasteddie313]

So do I do what haynes says or what?

haynes says...

"turbo models"

"20 deg btdc @ 2000 +- 50 with vac lines attached"

"Timing mark -20"


and..

3-9 deg btdc at 900 idle.. lines connected..

and..

250 mbar Vacuum applied to connection 1 of disributor (or link both ports to intake vacuum?)..

idle should raise and advance should be 32-38 deg btdc..



Or the 924board way of doing it??

remove and plug vac lines..

10 deg btdc at idle?

Is haynes correct and I can just do it that way + the control tests or what?

Very confusing..

Haynes is correct that the "timing mark" is -20 deg or 20 deg btdc?
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80 Turbo - Slightly Modified

[ideola]

Pretty certain I have my 80s all set to 20 deg btdc as per the instructions on the decal on the fender. I suspect that Haynes' instructions are a reasonable fascimile thereof.

If you're missing the decal, have a look at this thread:
http://www.924board.org/viewtopic.php?t=22954

I can't point you to the correct post in that thread because my company's firewall filters out most of the images, but pretty sure there is an S1 931 decal in there somewhere. That's what I would rely on rather than Haynes or some random posting on the forum.

Which leads to this question: where are you getting the 10 deg as "the 924board way" of doing it?
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erstwhile owner of just about every 924 variant ever made

[ideola]

Actually, my own post on the second page shows the correct procedure. The photo is actually from the 941 before I converted it to 944 expansion tank.
http://www.924board.org/viewtopic.php?p=249514#249514

From 941 (originally a 1980 931).




So notice the instruction column. You should remove and plug the vac lines BEFORE checking timing. On a fully warmed up car, set to 20 degrees BTDC +/- 1 degree at 2000 RPM. Then reconnect the vac lines.

The additional tests in Haynes are to confirm that the advance/retard is functioning correctly.
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erstwhile owner of just about every 924 variant ever made

[Fasteddie313]

[Fasteddie313]

Actually haynes says to remove and plug the lines on ALL models BUT turbo models in the specifications section..
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80 Turbo - Slightly Modified

[ideola]

Haynes is near-useless for turbo-specific instruction.

Use the instructions I posted above from the sticker. It's easy. Don't over-complicate things. Warm up the car. Turn it off. Remove the fact lines to the dizzy and plug them. Start the car. Bring up to 2000 RPM. Set timing to 20 BTDC. Turn car off. Reconnect vac lines.

Done.
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erstwhile owner of just about every 924 variant ever made

[Cedric]

To set this straight I here give you the Porsche factory service manual with all the info you need to have!

http://www.equipedic.se/docs/924/assembly/Porsche%20924%20Turbo%20Assembly%20and%20Adjusting%20Instructions%201980%20MY.pdf

from page 35.

Have a nice day and I hope you can turn the boost up soon
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1980 924 Turbo
www.instagram.com/garagecedric/

[Fasteddie313]

That was a total fail...

I guess I have to buy a timing light, if I want something done right I have to do it myself.. Like usual.. No changes were made...
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80 Turbo - Slightly Modified

[ideola]

[Fasteddie313]

[Fasteddie313]

[ideola]

I think the advance/retard is either going to work or not. If you plug the lines together as suggested in FSM, and you get the racing idle, there's a really good chance everything is working fine. About the only thing to fail is the vac diaphragm attached to the dizzy, and if it leaks, you won't get advance/retard. Honestly, I've never bothered (or found a need) to check the advance retard on any of my S1 cars. In my experience, the system is pretty foolproof. Set the timing to 20 BTDC and call it a day.
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erstwhile owner of just about every 924 variant ever made

[Fasteddie313]

I like your answer, less expensive/easier to find timing light, and less work for me..

Thanks again
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80 Turbo - Slightly Modified