Maxed out load points of DFA

[courier33]

I brought a 1995 series 1.5 R33 GTS-T Skyline a few months ago, was pretty happy with the performance but got excited and did the following mods:

Jasma 3.5" Cat back exhaust

Split front/dump pipe

Ball spring type boost controller running 11.5 psi

K&N pod filter

Iridium plugs gapped to 0.8mm

Got the car dyno tuned a few weeks ago and it made 178 kw at the wheels.

When it was making full power the air/fuel ratio was down around 9.5 to 10

which seems a bit too rich.

To fix this problem I brought the Jaycar Digital Fuel Adjuster and a Dick Smith Digital Air/Fuel Ratio meter. Calibrated the a/f meter for a 1v signal and the Fuel Adjuster for a 5v signal, which I believe is the maximum voltage for the stock O2 sensor and AFM of this car.

Took it for a run tonight and noticed that in a 3rd gear pull the air/fuel ratio started at 14.7 and climbed to 16.5 at redline :confused:

When I did another run I watched the Fuel Adjuster's load points in Run Mode and it hit load point 128 (maxed out) at around 5500.

Is the maximum voltage of the AFM 5.0v which I calibrated to? & is the Digital Fuel Adjuster cutting the output voltege to 5.0v which is causing it to max out and run lean???

Would be a bit suspect of believing a $60 A/F meter :crazy:

but the reading from the DFA has got me wondering what to do next.