hp gain w/AEM cold air intake for g35 coupe
#1
12-06-2009, 03:43 PM
Join Date: Apr 2009
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#2
12-07-2009, 12:44 PM
Simple engineering calculations!
Each 11F air temp drop increases density by 1%, so measure the air flow temperature before and after a change to se how much you gained.
Air flow restiction can be easily measured with a manometer attached just in front of MAF. The absolute aymospheric pressure is 407 inches of water column at sealevel [29.92" HG].
Normal oem intake and air filter have ~~ 6-7" H2O of restriction as measured in front of MAF. So measure before and after. So a 4" improvement at peak rpm [4/27.7 = 0.1444 x 0.68 = ~ 1% improvement].
3 HP maximum improvement +- any temperature change improvement.
Most after market system actually increase temperature [measured at highway speed] so measuring temp is a must.
Each 11F air temp drop increases density by 1%, so measure the air flow temperature before and after a change to se how much you gained.
Air flow restiction can be easily measured with a manometer attached just in front of MAF. The absolute aymospheric pressure is 407 inches of water column at sealevel [29.92" HG].
Normal oem intake and air filter have ~~ 6-7" H2O of restriction as measured in front of MAF. So measure before and after. So a 4" improvement at peak rpm [4/27.7 = 0.1444 x 0.68 = ~ 1% improvement].
3 HP maximum improvement +- any temperature change improvement.
Most after market system actually increase temperature [measured at highway speed] so measuring temp is a must.
#3
12-07-2009, 02:26 PM
About 0hp, maybe a little less, especially when the car is at a stop ingesting all the hot stagnent air from the bumper area just as Q45Tech stated. Research is your friend on this site. You could have saved yourself a few hundred bucks and gone with mods that actually make the power advertized.
#4
12-07-2009, 02:44 PM
Simple engineering calculations!
Each 11F air temp drop increases density by 1%, so measure the air flow temperature before and after a change to se how much you gained.
Air flow restiction can be easily measured with a manometer attached just in front of MAF. The absolute aymospheric pressure is 407 inches of water column at sealevel [29.92" HG].
Normal oem intake and air filter have ~~ 6-7" H2O of restriction as measured in front of MAF. So measure before and after. So a 4" improvement at peak rpm [4/27.7 = 0.1444 x 0.68 = ~ 1% improvement].
3 HP maximum improvement +- any temperature change improvement.
Most after market system actually increase temperature [measured at highway speed] so measuring temp is a must.
Each 11F air temp drop increases density by 1%, so measure the air flow temperature before and after a change to se how much you gained.
Air flow restiction can be easily measured with a manometer attached just in front of MAF. The absolute aymospheric pressure is 407 inches of water column at sealevel [29.92" HG].
Normal oem intake and air filter have ~~ 6-7" H2O of restriction as measured in front of MAF. So measure before and after. So a 4" improvement at peak rpm [4/27.7 = 0.1444 x 0.68 = ~ 1% improvement].
3 HP maximum improvement +- any temperature change improvement.
Most after market system actually increase temperature [measured at highway speed] so measuring temp is a must.
#5
12-07-2009, 05:13 PM
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#7
12-07-2009, 05:58 PM
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