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Intake Manifolds

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Marc W

Well-Known Member
Joined
Mar 31, 2017
Messages
1,234
Location
Colorado
I ran across an interesting article on Sonerai.net. The author described a mod to the GPAS intake manifolds that he claimed improved idle and gained him 25-50 RPM at WOT. What he did was remove the divider inside the manifolds that separates the front and rear intake ports. He has a slide valve carb so he doesn't know how it would work with the Zenith. I have a Zenith but I might give it a try. Mine doesn't idle as smooth as I would like when its cold but it idles decent when it is hot. I wouldn't do it just to improve idle. The additional 25-50 RPM at WOT throttle has my attention though. I would do it for 25-50 RPM!

The article is at: https://cloud-data.nyc3.cdn.digitaloceanspaces.com/sonerai/data/articles/vw_tips_part 1.pdf
 
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