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MSD 8485 springs best color advance for turbo motor
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58ragman
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Joined: September 29, 2014
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Location: OC to ontario
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PostPosted: Sun Jan 03, 2021 12:41 pm    Post subject: MSD 8485 springs best color advance for turbo motor Reply with quote

looking in the manual it has several springs.Im hedging toward the middle road and it has a light silver and heavy silver spring that is recommended.I also see the light blue may be ok also


any recommendations from the TURBO guys on spring curve color of springs for the MSD with good results
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Ohio Tom
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PostPosted: Sun Jan 03, 2021 1:16 pm    Post subject: Re: MSD 8485 springs best color advance for turbo motor Reply with quote

Many turbo guys just lock the dist at 24-26deg.
It's simple enough and runs fine on/off boost. No issues starting, mid range running is fine too.

Or.....You can map it with an aftermarket setup. A normal aspirated curve that advances at 1500-3500rpm range, then add boost retard with a MAP sensor setup.

While that all sounds great, there is an inherent danger with boost. If something happens you see 28-32deg on boost, things break.

This is why may guys just lock at 24-26 and then you don't worry about a wire falling off or an "oops".


regardless.. With the MSD springs, you want the color spring that starts advancing at 1200-1500rpm.
any lower than that and it will be advancing at idle, thus making a stable idle impossible.
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58ragman
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PostPosted: Sun Jan 03, 2021 1:55 pm    Post subject: Re: MSD 8485 springs best color advance for turbo motor Reply with quote

thanks for the break down Tom
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