Look at this Airbox

[HEMI®Dart]

Just the airbox shaved 8 seconds off his timed runs. He timed it twice. Who makes the RamAir III?



http://www.dodge-diesel.org/yabbse/index.php?board=7;action=display;threadid=14970

 

[4 RAM TRACKS]

air box

It's a Scott'y lll. I have one

 

[Prairie Dog]

BullDOg claims a 50H. P. increase but I didn't see it on the dyno.

Maybe his A/C clutch kicked out when he was running the test, His results are hard to believe.

 

[scotty1]

RAM AIR 3

I was surprised to hear/read Bobs results but he is a very thorough guy and did test it a few times. We are currently testing a Modified 3rd gen and will be pulling some weight soon to see what happens.

I know Rod did mention his mid range RPM was MUCH stronger.

 

[mgonske]

My Ram Air III came last Monday (haven't had a chance to call Rod and let him know yet). I finally got a chance to install it Saturday; currently running without the EZ.



Not much chance to evaluate yet, but a couple of observations. There is a slightly different sound in the cab under normal driving conditions; there is an especially noticeable difference in the sound of the exhaust brake After the first test trip, with lot's of WOT and some high speeds, the filter minder was pulled down beyond 65% After resetting, a short trip in fuel-saving (very conservative) driving mode produced no displacement at all (the factory filter produces 35% as a baseline, and had been at 65% before installing the Scotty).

 

[krabman]

8 seconds is pretty hard to believe. Imagine the hp needed or in this case hp that was previously lost to get that increase. It will be interesting to see if this proves out but I cant help but think something got messed up during the tests. I know from my own experiance trying to test stuff by taking objective measurements can be suprisingly difficult.

 

[RSnaith]

Originally posted by mgonske

After the first test trip, with lot's of WOT and some high speeds, the filter minder was pulled down beyond 65% After resetting, a short trip in fuel-saving (very conservative) driving mode produced no displacement at all (the factory filter produces 35% as a baseline, and had been at 65% before installing the Scotty).

Since we put the filter minder in the coupler, we've noticed that it will get pulled down, sometimes as much as 100%. Some research into the problem revealed that the factory filter minder will not work in a high air velocity area (this is why the minder is stuck in a low velocity area of the factory airbox). What happening is that high velocity is pulling past the filter minder, and creating a small vacuum right at the inlet of the minder, and pulling it down. We've been told that there are filter minders intended to be used in high velocity air situations, however we haven't found any yet. Unless we find something fairly soon, we'll simply be doing away with filter minder anyway, as its value is questionable in ram air situations.



On the 8 second run, I've asked Bob to redo his tests, although he did run them a couple times. On a stock truck, during our own unloaded testing, higher RPM power was definitely much stouter than stock levels (50 - 80 mph times were cut by 4 seconds. 50 - 100 mph time cut by 10 seconds, but my HO always seemed to struggle to get to 100 mph with the stock airbox), however when an Edge EZ was put on the truck, this power gain disappeared somewhat. As the modification level goes up, I believe this high RPM power increase will likely disappear. We'll be doing more testing with the stock airbox vs Ram Air III this week and next week, now that the truck has more miles on it.



Why are we seeing the power increase right now? And why did Bully Dog notice such a massive power increase with their system on the dyno? Its the IAT/AP sensor on the truck. During some independent dyno testing, its been discovered that the IAT/AP sensor can significantly influence HP (ie: fueling levels). As your air pressure drops, so do the fueling levels. We suspect this has been done for two reasons:



1) The EPA's new standards are "any elevation" standards. Particulates must now be minimized at more than sea level elevation.



2) Heat at higher altitudes. The HO equipped trucks can get fairly toasty, even at sea level. As altitude goes up, the fueling level gets cut back to help keep things cool.



So Bully's dyno is at 5500 ft. They stuffed the filter on there, and stopped driving the air system into vacuum, bringing up air pressure in the system to where it should have been. Therefore a HP increase. Our Ram Air system, due to the big scoop in front, begins collecting a pile of air at about 30 mph. Bobs testing was done in the 50 - 70 mph range, well into the effective range of ram air. As such, we articifially increased the air pressure in the system, and the ECM responded by adding more fuel.

 

[mgonske]

Originally posted by RSnaith

Since we put the filter minder in the coupler, we've noticed that it will get pulled down, sometimes as much as 100%. Some research into the problem revealed that the factory filter minder will not work in a high air velocity area (this is why the minder is stuck in a low velocity area of the factory airbox). What happening is that high velocity is pulling past the filter minder, and creating a small vacuum right at the inlet of the minder, and pulling it down.

That would be called venturi effect--makes sense.

 

[RSnaith]

Originally posted by mgonske

That would be called venturi effect--makes sense.

Exactly. Given that we're seeing some EGT reductions on stock trucks, and what is fairly siginificant reductions (150F) on mildly enhanced trucks, we're definitely getting the airflow we want. We're waiting for some pressure meter readings to come in from another tester in Texas, and we'll be picking up our own meter for testing later on, as the modification level on the test truck increases.