Competition Pressure drop across stock intercooler at 40, 50, 60, 70 psi?

[GOT-Torque]

I posted this in the 24V forum and didn't get any reponses.



Anyone have any idea how much pressure drop you would see across the intercooler at these total boost pressures (measured at the intake horn). 40 psi, 50 psi, 60 psi, 70 psi. .



For example at 60 psi total boost seen at the intake horn, do I have around 62 to 65 entering the intercooler or between 70 and 80 entering the intercooler?



Anyone?

 

[fest3er]

Too many variables for anyone to provide a definite answer.

One variable is engine RPM. If the engine were at idle with the turbo(s) generating 50 PSI boost, there wouldn't be much pressure drop across the cooler, because not much air is being drawn into the engine. However, at 4000 RPM, I would expect there to be measureable pressure drop, because the flow from the tube into the cooler and out into the next tube is restricted to some degree, and the engine is drawing a lot more air.

Another variable is heat removal. When more heat is extracted from the charge air, the resulting pressure will be lower.

Another variable is the compressor's map. If the turbo is operating within its map, charge air heating will be ... 'reasonable'; the resulting pressure drop from cooling the charge air will be typical. If the turbo is operating outside its map, the turbo will most likely be heating the air far more than compressing it; the resulting pressure drop from cooling will be much greater.

The pressure drops will vary depending on: turbo(s) used, turbo RPM, fan used, ambient air temp, intercooler efficiency, engine RPM, engine load and probably a few other things I haven't thought of.

But if you were asking about static bench test results, forget I said anything.

 

[NoSeeUm]

I did no where near high performance level testing, but I generally saw a 1-4 psi drop across the IC.

 

[Highfinance97]

I use to run 2 boost gauges and I generally saw about a 5 PSI differance,sometimes less but no more than 5 PSI







Michael

 

[GOT-Torque]

I know there are plenty of variables that affect the drop across it, just looking for some typical numbers. Sounds like the pressure drop is pretty minor. Thanks!

 

[NoSeeUm]

I did no where near high performance level testing, but I generally saw a 1-4 psi drop across the IC.

I really should clarify. I need to include the pressure drop across the intake manifold in what I said.



So my statement it would be compressor pressure vs manifold pressure vice compressor pressure vs IC outlet pressure.



Jim

 

[NoSeeUm]

I know there are plenty of variables that affect the drop across it, just looking for some typical numbers. Sounds like the pressure drop is pretty minor. Thanks!

The major variables would be flow and temperature. More cfm, more pressure drop. Hotter air, less pressure drop.



Jim

 

[Jim Fulmer]

I posted this in the 24V forum and didn't get any reponses.



Anyone have any idea how much pressure drop you would see across the intercooler at these total boost pressures (measured at the intake horn). 40 psi, 50 psi, 60 psi, 70 psi. .



For example at 60 psi total boost seen at the intake horn, do I have around 62 to 65 entering the intercooler or between 70 and 80 entering the intercooler?



Anyone?

60 at the intake horn will be close to 70 before the intercooler, that's about what I was seeing with a stock intercooler... ... . light years ago. With the PDR cooler it was a 4 psi drop and I dropped 55 degrees air temp and the horn over the stocker.



Jim