tuning question vafc2 plx r-300 a/f ratio
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From: virginia beach, va, usa
tuning question vafc2 plx r-300 a/f ratio
Hello h-t community. I have an issue. My car needs to be tuned. Currently I have a vafc2. I am thinking about buying a plx r-300. Now my major question is do i need a dyno to tune with the vafc2 and the plx r-300. I am just tuning for a/f right now with my basic bolt ons (4-1 header, blox im, intake, 3" custom exhaust, minor port and polish). Do I need to dyno tune? or can i just tune for 14.7 a/f. I have never tuned using the vafc before. I have taken it to someone but now they charge $400 which happens to be the price of the plx r-300. I am good with computers and math so I am fairly confident i can do this on my own. now with the plx r-300 and the vafc2 will i have good success or should i just take it to the dyno. The plx has datalogging so it seems like i could drive and tune later. Another reason why i like this route is because in the winter when the temps drop i could retune based on my wideband readings, basically i could tune based on conditions. if i take it to the dyno and spend 400 for them to tune I would be out 400 and if weather conditions changed i could tune it on my own. Id appreciate any good advice. I am in an obd2 vehicle so im not messing with the timing too much. thanks again h-t.
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From: Mustafar
Re: tuning question vafc2 plx r-300 a/f ratio (madlion)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by madlion »</TD></TR><TR><TD CLASS="quote">do i need a dyno to tune with the vafc2 and the plx r-300.</TD></TR></TABLE>
You don't need one, but it's the only real way to determine whether or not you've achieved the optimal settings for your engine. Tuning for a general A/F range can get you close, but the specific A/F ratio that's ideal for one engine at a given RPM won't necessarily be ideal for another.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by madlion »</TD></TR><TR><TD CLASS="quote">can i just tune for 14.7 a/f</TD></TR></TABLE>
Stoich is too lean under load. Most N/A tuners will generally tune somewhere in area of 13:1 for WOT/high-load conditions, but again, the good ones know that there isn't necessarily a magic A/F ratio that will yield the most power.
You don't need one, but it's the only real way to determine whether or not you've achieved the optimal settings for your engine. Tuning for a general A/F range can get you close, but the specific A/F ratio that's ideal for one engine at a given RPM won't necessarily be ideal for another.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by madlion »</TD></TR><TR><TD CLASS="quote">can i just tune for 14.7 a/f</TD></TR></TABLE>
Stoich is too lean under load. Most N/A tuners will generally tune somewhere in area of 13:1 for WOT/high-load conditions, but again, the good ones know that there isn't necessarily a magic A/F ratio that will yield the most power.
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