Jelikož tady někdo zminoval náporové sání pro mr2,tak zde jsou jeho výsledky

opravdu skvělá "investice". Zkopírováno z webu tte. The Ram Air Effect
Many people assume the direct ram air effect will give an engine more power by forcing air into the engine. This is not true for direct ram air (ie: not using high pressure area's from the car's bodywork) since these thermodynamic calculations prove it.
Operating Conditions
* Temperature = Tair = 20C = 293K
* Atmospheric pressure = Pair = 14.7PSIA (at sea level)
* Cpair = 1005J/KgK (constant for air)
* K = 1.4 (constant for air)
Case 1 @ 100Kmh (62Mph) = 27.78m/s
Calculating temperature of the ram air
* Tramair = ((Vcar^2/2gc)/cp) + Tair
* Tramair = (((27.78m/s)^2/2(1kgm/Ns^2)/1005J/kg) + 293K
* Tramair = 293.4K
The temperature increased by 0.4K or 0.4C.
* Pram = Pair (Tram/Tair)^(k/(k-1))
* Pram = 14.7PSIA (293.4K/293K)^(1.4/(1.4-1))
* Pram = 14.75PSIA - 14.7PSIA
* Pram = 0.05PSIG (gauge pressure)
So as you can see driving 100kmh will only have a gain of 0.05 psi. Now lets try for 200kmh.
Case 2 @ 200Kmh (124Mph) = 55.5m/s
Calculating temperature of the ram air
* Tramair = ((Vcar^2/2gc)/cp) + Tair
* Tramair = (((55.5m/s)^2/2(1kgm/Ns^2)/1005J/kg) + 293K
* Tramair = 294.5K
The temperature increased by 1.5K or 1.5C.
* Pram = Pair (Tram/Tair)^(k/(k-1))
* Pram = 14.7PSIA (294.5K/293K)^(1.4/(1.4-1))
* Pram = 14.97PSIA - 14.7PSIA
* Pram = 0.27PSIG (gauge pressure)
So by seeing how the velocity of the car increases the ram air effect...it is barely anything. So in reality ram air doesn't benefit Hp gains by actually building up pressure but by the fact that the engine is getting cool atmosphere air.

...prezidentův poradce... měl z astrofyziky 3-
"Prezidentovi poradci se mýlí,já ne!"
válcová zkušebna 4x4 do 1200hp