Temperature of Intake Air?
 

Anyone know how hot the charged air before the intercooler generally is on say the stock twins or asingle boosting >15psi max and what the max temperature it might reach right after the turbo?

It depends on several inputs.

Here's an example:

Compressor inlet temp: 90F
Vacuum at compressor inlet: 1 inHg
Manifold boost pressure: 15 psig
Pressure drop in IC+pipes: 2 psi
Turbo compressor efficiency: 70%

Compressor outlet temp: 288F

I attached a spreadsheet if you want to play with the numbers.

-Max

Well you should be more specific on which turbo you want info on and with what intercooler and where the intercooler is and what type of driving.

I remember mine intake temps after the intercooler being 19C at lowest on highway very cold nights and 25-30 normally. I think I saw somewhere in the 40s in traffic or boosting for minutes at a time but I dont remember for sure. Greddy 3 row fm with t66

stock twin intake temps at 15pounds would be dangerous on the stock ic

i have a quick question about your spreadsheet.


on your Temp at compressor inlet, its at 90f then you calculated 550k. im confused on this. does this mean the temp went in at 90f and then transfered to 550k?

also wouldnt it be easier to keep the unit the same? just use F, much easier to calculate:)

Well on an FC with stock turbo and ic, in about 70F weather, in traffic I saw temps around 100F, during regular driving, no boost, it was about 100-110. Under boost, .5 bar, I saw 137F.

- Steiner

K indicates 'Kelvin', the units for absolute temp in the metric system (Kelvin = degrees C + 273). In the US units system, absolute temp is measured in Rankine, where Rankine = degreesF + 460.

The calculations performed in the spreadsheet use absolute temperature in Rankine, so the jump from 90 to 550 is simply a units change (90 + 460), not an increase in temperature. It is mislabelled as K, when it should be R, although the calculations seem to be consistent - nice little calculator!

renns is right, its the same temp in different units. However, it sounds like I got the units wrong. :)

You have to convert to an absolute temp scale for part of the calculation, so I just did it in plain view.

Here's a fixed version of the spreadsheet. The numbers will be exactly the same, but I fixed the label on the absolute temp.

If you want to get technical than its actually 273.15

- Steiner

Anyone know what the turbo outlet temps would be on a large single (gt42, t88) of something similar. Since these larger turbos would be more efficiant at 15psi, would'nt the outlet temps be much lower than 288f?