total vehicle weight , i’m not sure how to get the exact weight of me and my jeep?
Answer:
While weighing on a weigh bridge or scale would yield the most accurate
weight, you can approximate by using the vehicle’s gross weight and
adding any additional weight, i.e., driver, fuel and any additional weight
for equipment not accounted in OEM’s gross weight.
boost adjustment(atmospheric pressure adjustment) , i’m not sure what this is about?
Answer:
Boost is the amount of pressure above atmospheric in the intake
manifold caused by air forced from a turbo or supercharger.
Typical boost is calculated using MAP – Barometer readings. The
barometer reading will vary based upon elevation. For vehicles
which do not return a barometer reading this field can be used
to manually correct. For most vehicles this value should be zero.
A correct boost reading will read near zero at KOEO.
volumetric efficiency , not the foggiest clue what this is?
Answer:
VE is a measure of the efficiency of the air taken into the cylinder.
Most vehicles at WOT should be from 70-85%. Vehicles equipped
with a turbo can compress the intake air to values even higher.
Use 85% when in doubt. (A 4.0L engine with 100% VE will take 4.0L
of air into the engine).
MPG trim adjustment (in case mpg is off) , ????
Answer:
The MPG adjustment is a factor that will allow user
to correct for any reporting differences found in MPG
after using all other means like faster communications
and use more sensors in settings.
and of course the big one is the OBD speed multiplier (for vehicles with different diameter tires then stock) , the stock size for my jeep cherokee is 215/75/15 but i have 235/75/15 tires and i plan on getting 33 inches tires eventually how do i input that?
Answer:
The speed multiplier corrects for any differences by
multiplying…
Displayed Speed = OBD Speed * Speed Factor
where:
Speed Factor = Old Factor * (Measured Speed / Displayed Speed)
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over sized tires
