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Mr Beau Mr Beau is offline
Registered User
Join Date: Mar 2003
Location: Edmonton
Posts: 550
Hi Nathan,

Your power run actually look a little lean. Typical wisdom is to run 12.5-13.2 for best power. A Dynapak will let you hold basically any RPM you want so you want to use this to your advantage. Pick an RPM (say 3000), go wide open on the throttle, and then start the sweep up to max RPM (~7000 RPM). The goal of this is to minimize the influence of the accelerator shot and have a long enough sample time as the engine accelerates so you have a good idea of the jetting.

Idle may be best around 14:1, and part throttle would be find anywhere from 14 to say 15.5:1.

I'm not a carb expert, but my understanding is that the WOT mixture is mainly the main jet and emulsion tubes, and to a lesser extent the air corrector jets. Part throttle is largely the idle jetting.

And if you change the choke size, your jetting will also be affected as the signal strength changes.
Matt B
'73 911E
Old 02-01-2006, 02:01 PM
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