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gofastman · 10-05-2006

I was helping my friend tune his car the other night with a 50/50 E85 mixture and we were able to turn the boost up into somewhat uncharted teritory, about 20 or so psi. It was pulling harder than I have ever felt before, but as the car moved to around 4500 RPM there was this strange "chugging" motion, so he let off. I'm thinking it was most likley the clutch (fairly new, stock) or spark blowout, there was only 1 count of raw knock and the IDC's were around 70% if memory serves.
any thoughts?

10-05-2006	#1
gofastman James Bond... James Bond Join Date: Sep 2006 Location: Roseville, MN Drives: 95 Jeep Posts: 303	what could cause studdering/chugging? I was helping my friend tune his car the other night with a 50/50 E85 mixture and we were able to turn the boost up into somewhat uncharted teritory, about 20 or so psi. It was pulling harder than I have ever felt before, but as the car moved to around 4500 RPM there was this strange "chugging" motion, so he let off. I'm thinking it was most likley the clutch (fairly new, stock) or spark blowout, there was only 1 count of raw knock and the IDC's were around 70% if memory serves. any thoughts?