[hightower99]

Matra your graph of a WEGO AFR Output does not say that it is for a broadband Lambda sensor. Are you sure that it isn't a narrow band? Another odd thing is that that graph shows linear output but hopefully you know that Lambda sensor outputs are not even close to linear.

Revetec: Thank you very much for your information. To be honest it boggles my mind if this is found to be true and not some faulty reading from one of the many sensors. I believe I have understood the facts so far.

At 2000RPM and WOT your engine is being fed (n) Lbs/min of fuel by a 12ms injector pulse (per intake stroke per cylinder I assume?). The Lambda sensor is showing Lambda 1.00 (14.7:1 A/F ratio). (n) HP and (n) torque is being produced as measured by a dynamometer.

At 4000RPM and WOT your engine is using an injector timing of 7ms which means it is being fed with (n*1.167)Lbs/min of fuel. The Lambda sensor is still showing Lambda 1.00 even though the engine is being fed at Lambda 1.71(25.1:1 A/F ratio). Roughly (n*2) HP and (n) torque is being produced as measured.

Now the problem is that alot of free gas oxygen (ie O2) is going into the engine while only alittle is coming out.

A question:

Are you running a catalytic converter?

(I am guessing that you are not).

You also say that the exhaust temp is low. (Only 280degC on the exhaust manifold close to the head).

My guess is that you need to hook your engine up to an exhaust analyzer. I would wager that your engine is producing alot of NOx. This would explain the Lambda 1.00 readings (as Lambda sensors don't count/can't sense oxygen bound in NOx). This would also help explain the low exhaust temps (NOx production is an endothermic process).

Have you considered this?