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Old March 9th, 2008, 18:05   #1
TDIClub Enthusiast
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Join Date: Aug 2004
Location: South of Boston
Fuel Economy: 50/45/37
Default What's the ideal fuel/air ratio in a TDI?

After my last dyno Jeff looked at the fuel/air graph and said I needed more fuel. I went from PP520s to PP502s and gained significant power. Here's the boost and fuel air table:

The blue line is with the bigger nozzles. As you can see the ratio has dropped throughout the rev range, but it makes me wonder: what's ideal? The car smokes, not a lot, but it's visible at low revs under high load. Can't see it at high revs. But there's got to be a formula for this.
2002 Jetta wagon, 375K, RC3+; 1993 Mercedes-Benz 300D 2.5, 197K; 1997 Passat, 286K; '99.5 Golf, 259K; 2011 335d, 56K; 2015 Golf Sportwagen, 11K. Principal,
Kid's cars: 2002 Golf TDI, 2002 Jetta TDI
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