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roxanne68 roxanne68 is offline
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Join Date: Aug 2005
Location: New Brighton, Minnesota
Posts: 37
Originally Posted by pdx930 View Post
Shouldn't the boost retard be going to the intake manifold in the engine side of the throttle plate?

At WOT it shouldn't really matter, save for negligible pressure drop across the throttle plate, etc. being tapped at the intercooler, it will see boost sooner then the cylinders (talking milliseconds here) and would therefore pull timing out sooner then at the intake and in theory a little safer, though in practice it shouldn't really matter.

When you take your foot off of the throttle and the plate closes, which means that you would start to build vacuum/loose boost in the manifold, which means that the the timing would be put back in (advanced). if your bypass valve is working correctly, the intercooler will not see much vacuum, but will loose boost, so the result is still the same. if it were tapped to the intake side, it would put the timing in quicker then the intercooler side, but since you are theoretically not under load or boost it wont really matter at that point, again no practical difference.

now if you were looking at the vacuum side of the distributor dash pot (the side that is meant to be engaged at idle/cruise) it most definitely had to be attached to the intake side throttle plate.

If somebody sees a flaw in my thinking, please correct me

'81 Euro SC coupe, 79 3.3 930 engine, 930 transaxle, B&B full dual outlet exhaust, 964 intercooler, 964 cams, CIS injection, K27 7006 turbo. '08 Triumph speedtriple. '06 BMW 330xi
Old 10-30-2011, 05:35 PM
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