Acceleration Factors?
Re: Acceleration Factors?
Originally Posted by 2005crossfire6speed
Ok how do factors such as temperature, elevation, and humidity affect acceleration, and quarter mile time?
High barometric pressure, sea level at 40 degrees F would give you the best engine performance. But that cold would hamper tire performace so unless it was at the end of a warm day you would lose some power transfer to the ground to hard tires on cold pavement.
NA's are less suseptable to variances than an SRT because the SC compresses the air, amplifying the overall effect. Again cool dry, dense air matters as it increases the ratio of compression by amplification. The more dense the air, the more you can force into the cylinders. The heat of explosion is the same so more air is a bigger bang. Dryer air means a more complete explosion. Again bigger bang.
Sea level has more air per cubic foot that high altitude. Again, bigger bang.
Bigger bang, more HP and torque.
Hope that helps.
roadster with a stick
Last edited by Franc Rauscher; 08-27-2009 at 12:39 AM.
Re: Acceleration Factors?
Originally Posted by Franc Rauscher
In english, higher temps, higher humidity and higher elevation will give you lower acceleration.
High barometric pressure, sea level at 40 degrees F would give you the best engine performance. But that cold would hamper tire performace so unless it was at the end of a warm day you would lose some power transfer to the ground to hard tires on cold pavement.
NA's are less suseptable to variances than an SRT because the SC compresses the air, amplifying the overall effect. Again cool dry, dense air matters as it increases the ratio of compression by amplification. The more dense the air, the more you can force into the cylinders. The heat of explosion is the same so more air is a bigger bang. Dryer air means a more complete explosion. Again bigger bang.
Sea level has more air per cubic foot that high altitude. Again, bigger bang.
Bigger bang, more HP and torque.
Hope that helps.
roadster with a stick
High barometric pressure, sea level at 40 degrees F would give you the best engine performance. But that cold would hamper tire performace so unless it was at the end of a warm day you would lose some power transfer to the ground to hard tires on cold pavement.
NA's are less suseptable to variances than an SRT because the SC compresses the air, amplifying the overall effect. Again cool dry, dense air matters as it increases the ratio of compression by amplification. The more dense the air, the more you can force into the cylinders. The heat of explosion is the same so more air is a bigger bang. Dryer air means a more complete explosion. Again bigger bang.
Sea level has more air per cubic foot that high altitude. Again, bigger bang.
Bigger bang, more HP and torque.
Hope that helps.
roadster with a stick
A little moisture is good, cars and bikes run better with a little moisture in the air. Water injection adds hp as well if I remember correctly.
Re: Acceleration Factors?
so, 2005crossfire6speed, wait till it rains in Death Valley during say winter when it's cool and I guess you'll get the best times.
Actually there is a huge difference between humid air and water injection. One makes the combustion chambers cool the other does not. Humid air does not cool the chamber. Humid air does not reduce pre-ignition knock. Humid air does not fire like water/meth. The moisture in humid air is already expanded (its vapor) unlike raw water, so the steam conversion is negligible. Then there is the matter of the compressor. On SC engines the water vapor doesn't like to compress and takes up room that could be usable O2. Humid air is bad. Period.
http://en.wikipedia.org/wiki/Water_injection_(engines)
I believe guys who actually go to the track will back this up. If not, I'll bow to their experience.
roadster with a stick
Actually there is a huge difference between humid air and water injection. One makes the combustion chambers cool the other does not. Humid air does not cool the chamber. Humid air does not reduce pre-ignition knock. Humid air does not fire like water/meth. The moisture in humid air is already expanded (its vapor) unlike raw water, so the steam conversion is negligible. Then there is the matter of the compressor. On SC engines the water vapor doesn't like to compress and takes up room that could be usable O2. Humid air is bad. Period.
http://en.wikipedia.org/wiki/Water_injection_(engines)
I believe guys who actually go to the track will back this up. If not, I'll bow to their experience.
roadster with a stick
Last edited by Franc Rauscher; 08-29-2009 at 09:54 PM.
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Re: Acceleration Factors?
Originally Posted by itsky
My XF runs SOOO much better at lower altitudes.
https://kb.osu.edu/dspace/bitstream/...28_i02_013.pdf
franc
Last edited by Franc Rauscher; 08-30-2009 at 01:45 AM.
Re: Acceleration Factors?
Originally Posted by 2005crossfire6speed
Well if humidity is bad then im in trouble. im in mississippi and it is so humid here, i cant stand it. Dont know about elevation though
Last edited by itsky; 08-30-2009 at 10:42 AM.
Re: Acceleration Factors?
Elevation will effect a NA motor 3% for every 1000ft. Elevation does not effect forced induction vehicles nearly as bad. have been told that a turbo engine is almost uneffected by elevation, something to do with the wastegate acounting for the loss of pressure and not opening until adequate pressure is obtained.
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