Thanks for all of the replies. Your info made = me think this through further. The consensus seems to be that my FI should = not be leaning out at WOT as it is. How about this: the stock fuel = pressure regulator is vacuum controlled. Should work with stock vacuum levels. Our WBX has a K&N air filter, S&S header, big VW = 16Valve converter and a 2.5" straight through muffler after that. Have I = changed engine fuel demand and vacuum enough that while it worked as stock, now = is doesn't?

----- Original Message -----

From: Darrell Boehler

Sent: Tuesday, November 14, = 2000 7:43 AM

Subject: Re: Digifant = performance stuff.

If your o2 sensor voltage is running 0.0 volts at full throttle I feel you could have a problem with fuel delivery. I would check = the fuel pressure or just change the fuel filter. You = should run 30 psi normally and 36 under full load conditions. Your and Marks = statements that the injectors are open nearly all the time at high rpm = is true but there seems to be enough duration for a proper = mixture. My O2 sensor voltage runs around 0.75 volts at full throttle, = even when wound up tight. The digifant system will go out of = closed loop when at full throttle or the full throttle switch is transferred. = Listee Kay Fremgen from Orlando, who is turing South America at the present = (hope he and Valeria voted) has a push button on his parking brake cover that = is in parrallel with the full throttle switch. He can force open = loop with the push of a button. = <= /FONT>

I have on accident = (forgot I had listee Bill Dummitt's ecu with an oz chip) pulled my van = up to near 6 k rpm. Never noticed it gasping for fuel or air. Luckily the = rods are still attached to the = crank. &= nbsp;

----- Original Message -----

From: Gary Stearns

Sent: Monday, November 13, = 2000 7:18 PM

Subject: Digifant performance = stuff.

, I saw that on a high speed uphill with = foot on the floor the voltmeter dropped to 0.00; mixture drastically leaning = out. Got home still pondering this, checked e-mail and found = that Mark had written me about his finding that at wide open throttle = (WOT) the standard fuel pressure regulator can't keep up with what = the engine needs