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Partial throttle tuning help needed please
Posted:
Sat Aug 07, 2021 3:12 amby 69BBSS
Car is a pump gas 10.5:1 565 BBC with a pro systems 1150 Dominator. The problem I’m having is that it wants to go crazy rich in part throttle cruise (10.5-11.5) and at WOT it’s a bit lean at 14.3. Do I need to take some out of the primaries and add to the main jets? Or do I need to mess with the dreaded emulsion tubes? Any help is very very much appreciated. Thank you.
Re: Partial throttle tuning help needed please
Posted:
Tue Aug 17, 2021 12:27 pmby Carb.Designer
For part throttle tuning, make sure the LSABs are clean of debris. The IFRs control the amount of fuel going to the transfer slots. As far as being lean at WOT, I would enlarge the PVCRs if the main jets are already tuned.
Re: Partial throttle tuning help needed please
Posted:
Tue Aug 17, 2021 3:24 pmby jmarkaudio
Unfortunately it souds like a lot of calibration help is needed. Do you have the spec sheet on it?
Re: Partial throttle tuning help needed please
Posted:
Fri Oct 28, 2022 9:11 pmby TMP Carbs
The carb is likely still in the off-idles at cruise so may not involve the main jets or power valve. How many turns out are the mixture screws?