Saab Turbo B-motor Timing control / distributor question

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DeLorean
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Saab Turbo B-motor Timing control / distributor question

Postby DeLorean » Wed May 08, 2013 10:15 am

All my 78 99 turbos have advance only on their distributors, I have a B-motor distributor, I THINK from an 80 900-Turbo, that has boost retard rather than just advance. Aside from obviously the base timing being very different between the 2, why did they switch? does anyone think it would be beneficial to add the vacuum retard function to the 78 99-t?

The one will tend to ping a bit once you have been at full throttle for over 30 seconds.
Less brake more gas!

nutcase
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Re: Saab Turbo B-motor Timing control / distributor question

Postby nutcase » Wed May 08, 2013 11:40 am

79- 99T's have the boost retard as well. I retrofitted mine. Didn't notice anything much :)

DeLorean
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Re: Saab Turbo B-motor Timing control / distributor question

Postby DeLorean » Wed May 08, 2013 8:12 pm

Well I stuck one on there, base timing 20 degrees @ 2000 RPM, with vac line un hooked & plugged.

Sound right? I know the UK spec cars say 23 degrees, but I still have working lambda control on this car... Woo hoo, 27 MPG highway ;)
Less brake more gas!

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Jordan
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Re: Saab Turbo B-motor Timing control / distributor question

Postby Jordan » Wed May 08, 2013 9:02 pm

Did they have centrifugal advance as well?

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Re: Saab Turbo B-motor Timing control / distributor question

Postby DeLorean » Thu May 09, 2013 12:17 am

Not sure if it does or not, but replacing it with the boost retard unit, and re-timing it fixed all pinging issues. Can now hold full throttle on the highway for as long as you wish! Now... needs water injection and more boost!
Less brake more gas!


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