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Lean On Part Throttle


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#1 Glun34

Glun34

    Just On Tickover

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Posted 11 August 2019 - 07:51 PM

Looking for some help with a fuelling problem I've got. 

1275 low compression unit running a garrett T3 metro turbo at 7psi with a HIF turbo carb. The cars been setup on a dyno but still isn't running right. Before it went on the dyno it would run very lean, 16-17 on my AFR gauge on boost and on part throttle it would go off the gauge to 22 and cut out completely a few times. This was traced to a faulty fuel pressure regulator and now it runs at around 12 on boost but still lean off boost on part throttle! With part throttle (around 30% id say) it sits anywhere between 14-19 if you move from part throttle to 50% or full throttle to fast it will lean out and go off the gauge. My though is it may need a different dashpot spring or needle? Has anyone got any ideas? im new to turbo minis and carbs in general so though I would ask! 

Cheers for any ideas!






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