On the dyno, the car isn't moving so that wouldn't be an accurate representation of how well an intake performs would it?

Even if there is heatsoak on an intake, when driving at moderate to high speeds, wouldn't the air coming in from the outside be sucked in even before it can get sufficiently warmed up to lose power?

On the dyno, heatsoak causes loss of power because the car is just sitting there and sucking the air from the engine bay.

Just wondering, not trying to prove or say anything.

 

they use large fans to immulate normal driving conditions.

 

case closed!

 

hey cloud, r u still using the orc 409? If so, how is it holding up? (I never installed mine)--running the OS Giken STR for the moment.

as far as the ot, large fan(s) are used, but not all shops have an opening to ambient outside air. Not sure if it makes much of a difference, but I think dyno operators attempt to accomplish real world conditions with whatever equipment they have.

 

I took the 409 out while it was pretty new because I prefer using a street clutch. It was nice and quieter but I didn't like the engagement and being in LA that is definately not the clutch I would use.

i wonder if the fans will simulate the real world conditions properly.

 

They do not simulate it 100%. The fans are for cooling. Air pressure/speed is variable dependant on vehicle speed, a fan is not. It helps eliminat the heat soak, but not the flow of incoming air. Use the Camaro SS as an example: (Forgetting the exact speeds) at below 50 mph the air pressure is not enough to make a difference and at 80+ the pressure is so high it passes right over the induction port. Consider that when thinking of the air hitting an Ingen filter or a stock box with a varis-type duct.


InZomniac (Works in a shop with an in house dyno BTW)

 

precisely what i was getting at. a CAI would suck on the Z/G on the dyno but nobody really knows how well it performs when the car is moving at moderate to high speeds.

 

A lot of it depends on the intake being tested.

Some CAI's are really Hot Air Intakes and breath in hot air from behind the radiator at any speed.

Some actually work at speeds above 30MPH. Stillen and Pop Charger.

The effectiveness of the intake can be measured (in part) by measuring the MAF air intake temperature with a OBDII scanner, techtom or Cipher data logger.

On a 70'F day some intakes will measure temperatures as high as 150'F at any speed. This is because they breath in engine compartment air. And high intake temperatures reduce ~10-15 HP. (I measured this on the dyno)

Some intakes with a good heat shield will breath in nearly ambient temperature air when moving at speed. But they can still draw in hot air once you stop. In this case, it will degrade performance during a launch but will pick back up in about 5-10 seconds.

At least this is what is shown by a data logger.

 

thanks. definately the answer i was looking for. Need to pick up cipher.

 

Cipher is a very cool tool to learn about your engine functions.