Advanced Induction 416 ci, HR, L92, Vic Jr - 714hp *NA*
12-30-2011, 10:20 AM
#41
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David,
You may be right about this issue being ignition. On most of those passes I had the limiter set at 7800 to 8k and I wasn't near that rpm limit. The timing is on the low end (very low on the strap before the turn).
I didn't really change anything with the carb from the dyno. It was identical jetting and tuning. My only variables were the input fuel pressure and/or volume compared to the dyno cell.
After measuring the vacuum at idle, I found that my powervalve in the carb was too big (4.5) and Prosystems recommended I remove it and square jet the carb. I haven't had a chance to test this setting yet. I've got a ton of testing to do and plan to take it to the dyno to iron these issues out. I plan to try some ignition changes while I'm on the dyno.
What kind of max timing are you running with your setup?
-Sean
You may be right about this issue being ignition. On most of those passes I had the limiter set at 7800 to 8k and I wasn't near that rpm limit. The timing is on the low end (very low on the strap before the turn).
I didn't really change anything with the carb from the dyno. It was identical jetting and tuning. My only variables were the input fuel pressure and/or volume compared to the dyno cell.
After measuring the vacuum at idle, I found that my powervalve in the carb was too big (4.5) and Prosystems recommended I remove it and square jet the carb. I haven't had a chance to test this setting yet. I've got a ton of testing to do and plan to take it to the dyno to iron these issues out. I plan to try some ignition changes while I'm on the dyno.
What kind of max timing are you running with your setup?
-Sean
