i plan to get my car dyno tuned really soon but am not sure if i should get a fuel pressure regulator or not..currently im i have a vafc and skunk cam gears..those being tuning tools..the thing is im told that i would need a fpr to lean or richen and vafc to do the other i forgot which for which..would i be okay with just a vafc..i want to get the best out of the tuning but my situation is im in ca and with either b&m fpr and gauge or aem fpr..id fail visual for sure..any input suggestions thanks

 

No point messing with the actual fuel system parts unless you're changing out injectors that will need a new pump. If you have the stock pump and injectors, keep the rest of the stuff stock.

 

ok because i was told its better the more tuning tools the tuner gets to use..i was told by many that vafc isnt efficient in doing either leaning or richen fuel so id need the fpr to do that other task so thats why i ask

 

The whole point of the VAFC is to adjust the mixture. You don't need to play with fuel pressure for it to be effective.

 

ok i know the exact point of it now..fpr to richen and vafc to lean ..to get the most efficient output from tuning..but your sayin ill be fine wit jus the vafc for tuning?

 

The VAFC is perfectly capable of adjusting the a/f ratio in both directions, through changes to injector duty cycle. You don't need to touch the fuel pressure.

 

There is a severe limit to the amount of fuel that can be added with a piggy-back such as a V-AFC or an Field unit, especially in the upper RPM ranges when the MAP signal is approaching its max value (leaving very little or no room for manipulation via the piggy-back). Most tuners (including one of the most capable on the east coast, employ the method of raising fuel pressure (and thus adding fuel) with an adjustable FPR, then leaning out where necessary using the piggy-back.

 

Right, assuming of course that this motor is actually modified to the point where it needs more fuel in the upper rpm range. The stock ECU program is generally already very rich in that area, and unless he's got some cams (which haven't been mentioned) I see no use for an FPR.

 

i forgot to mention i would have itr cams in by by the time of the dyno tune