Quote:
Originally Posted by Isaac Zackary
So yes, it seems like this carburetor is better suited for one AFR across the board. Most VW guys usually jet these to run 13:1 or rich across the board. A few ecomodding types can get them to run around 16.5:1 to 17:1 at low throttle and then enrich to 13:1 or so at high throttle. What I'd like to know is if I can get it to run 17:1 to 18:1 across the board and use something other than extra fuel to control high EGRs and detonation at high load.
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You can certainly run 17:1 across the board, you'll have a lot less power but it'll work and not burn valves. (maybe hook up an aftermarket methanol/water injection kit to mist the engine with extra gasoline at full throttle?) At high rpm you'll have a lot of problems though since it'll probably lean out even more and lean mixes do not burn well at all.
Perhaps you could try shaving the heads to raise the compression ratio even more.