Tucker
Active Member
It seems there is a misconception on the under hood temps with a cold air intake and dyno testing with the hood up vs hood closed.
99% of all dyno shops do not have fans and HVAC to simulate driving speeds and air flow. Most have a simple fan to blow on the radiator tokeep coolent temps down, but that's about it.
NASCAR shops and bigger places like Arrington have full on dyno cells that will keep temps in the room what ever you want and have fans that simulate the speed the car is moving (or would be moving) that flow over the car.
A dyno run is to measure HP, the HP you would have on the street or track. Basicly in a 1/4 mile WOT run. In a 1/4 mile run your car will reach anywhere from 110-130+ MPH and at those speeds your underhood temps are at or near ambient air temps.
So dynoing with the hood up is only getting ambient or close to ambient temps to the filter, just like it would see while driving and that's an apples to apples test.
Dynoing with the hood closed and a small shop fan will increase IAT temps beyond what they are on the street and give a false reading.
Also, yes, when in traffic and low speed driving your temps will increase, but that's not when you need the power. It's when your NOT in traffic and are moving much faster. Plus with the opn filter the higher temps come down faster too.
We have also tested the stock airbox and it also increases temps at idle and low speed.
This is easy to see for yourself as long as you have a tuner to datalog with.
We did some video to show you exactly what we are talking about. Most of the time the IAT's are 4-10 above ambient, not hotter like you would think.
Video: DYNO TESTING WITH THE HOOD UP EXPLAINED - YouTube
Thanks
Jay
99% of all dyno shops do not have fans and HVAC to simulate driving speeds and air flow. Most have a simple fan to blow on the radiator tokeep coolent temps down, but that's about it.
NASCAR shops and bigger places like Arrington have full on dyno cells that will keep temps in the room what ever you want and have fans that simulate the speed the car is moving (or would be moving) that flow over the car.
A dyno run is to measure HP, the HP you would have on the street or track. Basicly in a 1/4 mile WOT run. In a 1/4 mile run your car will reach anywhere from 110-130+ MPH and at those speeds your underhood temps are at or near ambient air temps.
So dynoing with the hood up is only getting ambient or close to ambient temps to the filter, just like it would see while driving and that's an apples to apples test.
Dynoing with the hood closed and a small shop fan will increase IAT temps beyond what they are on the street and give a false reading.
Also, yes, when in traffic and low speed driving your temps will increase, but that's not when you need the power. It's when your NOT in traffic and are moving much faster. Plus with the opn filter the higher temps come down faster too.
We have also tested the stock airbox and it also increases temps at idle and low speed.
This is easy to see for yourself as long as you have a tuner to datalog with.
We did some video to show you exactly what we are talking about. Most of the time the IAT's are 4-10 above ambient, not hotter like you would think.
Video: DYNO TESTING WITH THE HOOD UP EXPLAINED - YouTube
Thanks
Jay