No. A VAFC can take away fuel. It's not so good at "adding" fuel and on a blown car, this is more likely what needs to be done.

 

A bolt-on Comptech supercharged S2000 will slowly pull on a 01 NSX from a roll. I've done this 3 times.

Satisfied? I recommend you test drive one first. I love my supercharger and couldn't imaging driving the S2000 without one.

 

I agree that its not so good at adding fuel,

But it helps your power and be more in the safety margin. Dyno proven on mine.

 

I am wondering how are you Comptech Supercharger owners check the pressure of FPR? or you just don't care and tweak it to the satisfied A/F ratio you like?

 

In addition to above questions, what is an acceptable A/F ratio under boost. I have the AEM A/F Gauge and under boost I am running about 13.5-14.0. Out of boost I am running 14.6-15.1

Are these acceptable numbers? Vortech stated that with my Mugen header the car might be running leaner, but I haven't see that.

Those with gauges what are your numbers?

Deiger

 

Are you noting the A/F at WOT in the upper rpm range? At WOT, in VTEC, my AEM UEGO is showing 12.2. I think 13.5 is a bit on the lean side for WOT operation (high load).

 

WOT? What does this mean?

Also should the A/F numbers stay the same from 6200rpm to 9k (I have the same gauge as you xviper)?

Finally, anyway to adjust the richness of the engine without an AEM ecu?

Deiger

 

WOT = Wide Open Throttle = "floored"
It should be pretty steady once the throttle plate is wide open even from lower rpms but especially during the upper rpm range.
You have a Vortech, right? You can alter the a/f a bit by upping the fuel pressure. However, the Vortech FMU is not easily adjusted (unlike the Comptech which only requires turning a screw). You have to take it apart and put in the appropriate part inside that will increase the fuel pressure. It's an educated guess at best and you can get the parts from Vortech. I've never had the need to do this. Perhaps someone who has, can post here and tell you what's involved.

 

WOT = Wide open throttle

the AF's on a stock PCM equipped car will vary greatly on a wideband when the PCM is operating in closed loop. You'll see 11-17.1 as a normal range. Once you're in VTEC and at WOT the AF's should stabilize and not vary much. Although with the stock boost Vortech and a header, I'd expect #'s in the 13's

There is no adjustment to the FMU on a Vortech car unless you dis-assemble it and replace the internals to change the rate of fuel pressure increase.

 

Ya took the words outta my mouth.