Dam Air temperature testing

[Vaughn MacKenzie]

This afternoon I borrowed our little high-tech digital thermometer and a probe from work and ran some informal airbox temperature checks.



I recently installed Doug Hofeldt (aka Air Bulldog) Dam Air airdam and thought it would be fun to see how much it affected air temps plumbed up to the airbox.



Here are some results:



Test One

Ambient temp = 98F

Inlet: Dam Air + Fender snorkel

A/C: High

Temp probe in prefilter side of Airbox

Filter: Dirty Amsoil Foam filter





Idling, hot engine, 5 min: 125F

Steady 35mph in town: 100-107F

Stop & Go, heavy traffic: 105-118

Highway 60-70mph: 99-102





Test Two

Inlet: Fender snorkel only (Dam Intake blocked)

All other conditions the same



Idling, hot engine, 5 min: 137F

Steady 35mph town: 107-112

Stop & Go, heavy traffic: 110-122

Highway, 65mph: 105-107



Test Three

Inlet: Fender Snorkel blocked, Dam Inlet only

All other conditions equal



Temps were close to Test One except were elevated 1-2F.



Since I have gotten the Dam Air I haven't noticed a significant decrease in EGTs in normal driving, (maybe 25-50F), however when towing 2 snowmobiles on a flatbed (close to 2000lb) I was able to take pretty steep grades on the highway at 75mph and I maxed out at 1000F. I have an ETH with Piers 35-16. 7 turbo, ATS manifold and 5" exhaust.



http://dpofutah.tripod.com/id39.htm



Vaughn

 

[illflem]

Vaughn, I think you would see much greater drops intake temps on the outlet side of the intercooler with the new hood. It seems to drop exponentially depending on the inlet temp on the outlet side. That's what I've found with a probe in the intake manifold when experimenting with winter fronts, fanless and underhood only intake air.

 

[SlyBones]

Hey illflem, Can you say that again, only a little slower. For slow guys like me.

 

[Steve Campbell]

Illflem...

I think Vaughn only has the "Air Dam" and not the hood. I may be wrong there.



Vaughn, what is the 16. 7 you listed on the Piers Hx35 turbo?

 

[illflem]

Sly, what I'm saying is there isn't a 1 to 1 ratio between pre and post intercooler temps. A 1° drop in the temp at the air filter can result in 5° drop in the temp at the manifold, a 2° drop at the filter can result in a 15° drop at the manifold. See what I'm getting at? It isn't a straight line relationship, it multiplies. Of course the temps at the air filter are always the lowest since the turbo heats the air to 200° plus. If Vaughan took his temps down steam from the turbo he would see that his dam makes a much larger difference than at the filter. I was doing some experiments with LarryB's turbo shield and didn't get very excited about the slight temp drop. When I communicated this to Larry he was stoked with the results. The few degree drop at the filter resulted in a 22% drop in manifold temps.

 

[SlyBones]

illflem, Thanks I see what your getting at.

 

[Vaughn MacKenzie]

Re: Illflem...

Originally posted by Steve Campbell

Vaughn, what is the 16. 7 you listed on the Piers Hx35 turbo?

It's called a "slip of the finger. " #ad




illflem, good point on the temperature change pre and post intercooler. At some point I will stick a probe into the intake horn and read temps there. I thought it would be fun to see how much impact the Dam Air would have on air temps coming into the airbox and obviously it makes a difference.



Vaughn