what is the air tempature inside the engine compar

[qwik219d9]

what is the air tempature inside the engine compartment?

the air temp. of air just before it enters the air box? I'm estimateing it to be around 200 degrees.

1 well respected member here wrote that every 10 degree's of cooler air thought the intake is whorth 1% HP increase

I recently made the ram air hood functional it made a noticable differnce, so I need to know this air temp so I can calculate the increase of HP w/ real ram air.if it was 200 degrees w/ a 500HP motor then I just gained 65HP.

500 HP w/ regular intake air at 200 degrees

my intake air average temp 70 degrees so 130 degree drop =s 13% more power

so on a 500HP engine I gain 65HP w/ a 130 degree air temp. reduction?

65HP=13%X5hp
sound about right? I do understand this increase will flucuate proporsionally w/ ambient temp.
comments

[tatertot91]

i think you're looking at this the wrong way
can see 10hp gain but not 65

[qwik219d9]

I have noticed a major HP increase w/ my functional & sealed ram air.

the air outside the engine compartment must be alot cooler than the air inside the engine compartment.

so I would like to calculate my HP increase.

I have also observed much lower RPMs at cruising speed on the expressway w/ the functional ram air.

about a 400-500RPM decrease at the same speeds.

here's a image of the sealed air box and the ducking I made I have read that w/ this type of intake the air becomes presureized at 60MPH and increases the presure the faster you travel.

[garygnu65]

the F-bodies do not take air from inside engine compartment,but from in front of the radiator.the ram air dose help alot.

[tatertot91]

no offense, but 400-500 RPM drop because of ram air doesn't make sense. Motor has to spin so fast to make the car move at a certain speed, HP has nothing to do with it.

[cammed goat]

I think OP would have to do some datalogging with a laptop and tuning software to find out what the temp going into the airbox would be. I don't think the air would be 200 degrees as the outside air goes directly into the airbox which is directly in front of the engine.

[tatertot91]

I think OP would have to do some datalogging with a laptop and tuning software to find out what the temp going into the airbox would be. I don't think the air would be 200 degrees as the outside air goes directly into the airbox which is directly in front of the engine.

:agree: no way doe the engine suck in 200 degree temps

[qwik219d9]

OK maybe the 200 degree was a tad high so I'll calculate for 150 degrees

still the 500HP engine 150 degrees compared to the 70 degrees (ambient temp) 80 degree temp. reduction =s 8% HP increase so

8X5=40HP

post #6 I'm compareing funcsional ram air to non ram air.

[qwik219d9]

no offense, but 400-500 RPM drop because of ram air doesn't make sense. Motor has to spin so fast to make the car move at a certain speed, HP has nothing to do with it.

I made fog light covers at the same of RA so the RPM drop is a result of both mods, have'nt tested each mod individually.

[tatertot91]

OK maybe the 200 degree was a tad high so I'll calculate for 150 degrees

still the 500HP engine 150 degrees compared to the 70 degrees (ambient temp) 80 degree temp. reduction =s 8% HP increase so

8X5=40HP

post #6 I'm compareing funcsional ram air to non ram air.

I think you should remove your ram air setup and check your IAT temps, then hook it back up and see the difference. My guess is you won't see much cooler temps but increased air flow. Without ram air the air that comes in the motor is still coming from outside, it just isn't being forced into the engine like it would with a good flowing ram air setup.

[Cutlass]

while moving, I bet there is less then a 10 degree difference between your sealed ram air and a stock ram air. They both function as cold air intakes.

[tatertot91]

while moving, I bet there is less then a 10 degree difference between your sealed ram air and a stock ram air. They both function as cold air intakes.

[cammed goat]

Maybe wrap the airbox with insulation?

[tatertot91]

Maybe wrap the airbox with insulation?

lol bag of ice in the air box ftw!

[tatertot91]

I made fog light covers at the same of RA so the RPM drop is a result of both mods, have'nt tested each mod individually

Missed this post but HP and Aerodynamics do not affect what speed you engine has to spin to maintain a constant speed, that's all gearing

[cammed goat]

lol bag of ice in the air box ftw!

[qwik219d9]

I think you should remove your ram air setup and check your IAT temps, this would be a hassle because it's gluded in preamentally then hook it back up and see the difference. My guess is you won't see much cooler temps but increased air flow there is diffenitly increased airflow it's actually presurized at 60MPH ? would explain the major increase in HP. Without ram air the air that comes in the motor is still coming from outside, it just isn't being forced into the engine like it would with a good flowing ram air setup.

while moving, I bet there is less then a 10 degree difference between your sealed ram air and a stock ram air. They both function as cold air intakes.

yes however the stock RA has a 1" opening that will allow hot inside air to mix w/ the outside cooler air.
this 10 degree differnce only =s 5HP acording to my calculations it feels like alot more to me.

I guess the only real test will be at the track to see if I have reduced the 1/4 time

[JRENIGAR]

hp tuners showed a 15 deg reduction at crusing speeds when the fra mod was done to my car.

[qwik219d9]

hp tuners showed a 15 deg reduction at crusing speeds when the fra mod was done to my car.

what type of fra do you have I see a 99 Camaro in the sig.?

is it sealed like mine?

did you're RPMs lower at expressway speeds?

w/ a 15 degree drop in temp. acording to my calculations is a 7.5HP increase

usally w/ a small increase like 7.5 you don't get the seat of the pants feel.

[c5z28]

There is a point of minimal returns. Cold (I mean cold air) will not mix as easily as warm air does with fuel in the chamber resulting in a incomplete combustion. It helps but you figure once the car is moving the turbulent air isn't going to be as hot as if it was sitting around. S/c setups certainly see gains but there intake charge is a lot hotter.