« Previous Entry | MAIN | Next Entry »
June 10, 2005
The obvious answer is a before and after test with a dyno/rolling road, but
there are pitfalls here for the unwary - your car will be stationary rather
than moving through the air, though a blower is usually directed at the
radiator/engine bay. The bonnet will also be open rather than closed, so
airflow into your cold air intake might not be the same. These changes in
operating conditions can all affect the HP, though if you endeavour to keep
the same conditions, you might pick up a difference due to the new intake.
On the other hand, if you don't have access to a dyno, it'll have to be by
testing the acceleration before and after. If you don't have access to a
drag strip with accurate timing, the best way to do it is accelerating in a
single gear over a given speed range, say 40 to 60mph or 50 to 70. Use a
level bit of road and do a few runs in each direction to discount wind
effects. Start accelerating from below your chosen speed and accelerate
through the band starting and stopping your stop watch as you pass the
actual marks on the dial.
Don't forget that you might need to optimise the mixture to take account of
the denser air, but without the dyno and mixture analyser, this is probably
going to be trial and error.
David
"David Jacobs" < mail@... > 37489
Posted on June 10, 2005 01:04 AM
Posted to category(s) Body | Cooling System | Drive Train | Engine (external) | Engine (internal) | Intake System | Tuning
