I have had some concerns over the power and torque of my car for a while.
But had to sort out the petrol pump in the main tank first before doing the dyno tuning.
Secondly, the Lexus is argued by many to be sub-optimal for most 44 applications.
But whatever you believe an engine should ideally be able to do in terms of torque and power, and at a given engine rev level, the figures below is what matter.
Note, that I use the original ZD30 airfilter, which is not ideal for a big breathing engine.
Power from the flywheel:
IF (a big word), the air filter is disconnected, and having adjusted for altitude (pretending we are at sea level), then the power reached at 5,000 revs, is 190Kw (232HP) - off the fly wheel - which is what the engine is spec'ed to do.
Power from the wheels:
The impact off the air filter is about 16kw (reading off the flywheel is thus down to 174KW). But the airfilter only seems to have an effect at revs above 4000, so for most applications this is not a concern, in itself.
Measuring the power off the 33" tyres the reading is way down to 116 KW (about 155HP)/b]
Torque from the flywheel:
This is the interesting part, the torque from the beginning (seen on the chart from 1000 revs) is 373 NM (off the fly wheel) and remains at exactly that level and only starts to creep down after 4400 revs.
As with the power, the level of 373 NM is apparently what the engine is spec'ed to do.
Torque from the wheels:
Without the air filter, it the torque level of 373 NM starts creeping downwards at 50000 revs, but again, the application at that rev level is only of use on dunes.
Measuring the torque off the 33" tyres the reading is way down to 250NM.
So in summary, it is not as great as I had hoped it would be.
But an important thing I learned is that that there is not such thing as "poor low down" torque in this engine. As least not relative to the high end torque. It is all the same at all rev ranges at 373 NM (measured from the flywheel) and 250 NM (measured from 33" tyres).
Attached are the figures, comments are welcome.