I want to compare my intake charge temps with others. What type of intake air temps are you guys seeing?

For example, I let my truck idle for 10-15 minutes yesterday in 74° weather. The air temp at the intake was 122°, the air after the blower was 155°, and the the air entering the engine was 130°.
I have a friend and his stock 2003 which idled for the same amount of time in the same weather his intake air temp was 99° and the secondary intake air temp was 129°...

I did the same on the freeway for approximately 10 minutes each run.
70mph
2200 rpm
72° outside air temp
70° intake air temp
180° blower exit air temp
108° secondary intake air temp

80 mph
2600 rpm
73° outside air temp
70° intake air temp
200° blower exit air temp
110° secondary intake air temp

90mph
3000 rpm
73° outside air temp
70° intake air temp
210° blower exit air temp
112° secondary intake air temp

The temp would really rise when I got on the boost. I could be pushing 275° blower exit air temps and the secondary air intake temps would rise quickly to 150°+.

These runs were with a 3.16:1 blower pulley ratio.
2200 rpm=6952
2600 rpm=8216
3000 rpm=9480
KB blower and some intercooler mods.

 

What the fock is that on the back of your truck?

 

I like it Easter it gives your truck that "sleeper" look!!!

 

So how do you store your topper when not in use?

 

do you have an aftermarket heat exchanger?

 

Which one?
Lately I've been having to tie them down with ropes so they don't blow out of the yard. I did the same thing to my trailer and it beat the tornados earlier this week.

 

I have a JDM heat exchanger, stock heat exchanger, and coolant fluid routed through the heater heat exchanger. The stock heat exchanger under the blower is still in place. I did grind the bumps from the inside of the adapter which fits to that heat exchanger.

 

did you ever take temps with the stock heat exchanger and then with the JDM unit to compare? and then with the heater core re-routed? do you have your "heat" on while taking the temps? I hope someone else with temp sensors chimes in to see any differences.

 

easter, thanks for the data! Very few people take the time to actually measure what they are doing. You are to be commended.

From your measurements, I calculate intercooler effectiveness ("efficiency" is not the correct term) for your 70/80/90 MPH runs at 65/69/70%. These numbers seem about right for a typical air-to-water intercooler, but much lower than reported by others. As I previously observed in my Web site in response to Holdener's article in MM&FF:

"At 20.6 PSIG, the air leaving the Kenne Bell was reported as 307°. The air exiting the intercooler was 107°. Assume a 75° day. (307°-107°)/(307°-75°)= 84% effectiveness. Assume a 95° day and the effectiveness jumps to 94%. Even assuming a 55° day, the effectiveness is still 79%.

These kinds of numbers seem extremely unlikely for an air-to-water intercooler."

I have some questions regarding the reliability of your data, as well as the accuracy of the comparison with your friend's truck. What were you using to acquire this data? If you were using a digital thermometer for one and the stock OBDII sensors for another, I would throw that data out the window. I would only use temp data from known accurate probes. Just a few degrees can make a real difference in these calcs.

No matter what, however, running through the stock intercooler, your KB should be making cooler boost than the stock S/C--both before and after the intercooler core.

I suspect that you may already know some or all of the above, so please do not take offense to my jumping in with more questions rather than answers. Thanks again!

 

I don't have any before and after.

 

Tim, we used an autotap on both trucks. I also have autometer temp probes before and after the intercooler to measure the blower exit temp and the air to engine temperature. I have noticed the one I have located in the runner to the #4 cylinder is off by maybe 5° from the OBDII sensor which is in the #2 runner.

The 307° at 20psi is probably accurate. I was getting some temps in that area during testing yesterday. I have enough pullies to get to 20-22psi boost at around 5500rpm. Since the boost and blower exit temps are from the autometer gauges and are analog it is difficult to remember exactly what the #'s are.

I'm going to try and install a lever where I can control the water flow and see if more flow would be beneficial.

 

thats where you ran off to my little batch!! Dallas eh... no call no nothing. my SO forgot to pay our phone bill withc was ermm. ..a little steep after pokeing us good in tha corn shoot. no phone call or nothing,Better bet your **** I'm sending this by email too!

 

Here are some more test results. About 5 minutes at each speed. The blower exit temps are more of approximation than any thing. I have an autometer gauge which may be inaccurate. Comparing the sensor for the secondary air temps with autotap and the autotap probe temps, I get 5° lower readings with the autometer gauge. So, I added 5° to the autometer gauge reading. The gauge also is difficult to read while driving. It reads to the nearest 10°.

80 mph
55° first intake
92° second intake
145° blower exit
outside temp 60°
efficiency=59%


70mph
55° first intake
86° second intake
140° blower exit
outside temp 60°
efficiency=64%

60mph
55° first intake
91° second intake
130° blower exit
outside temp 60°
efficiency=52%


50 mph
55° first intake
96° second intake
123° blower exit
outside temp 60°
efficiency=40%


70mph
57° first intake
87° second intake
133° blower exit
outside temp 62°
efficiency=61%


80mph
57° first intake
90° second intake
140° blower exit
outside temp 63°
efficiency=60%


Basically I think what I am seeing is the intercooler is more efficient when more air is forced through it. Sooner or later I'll find out at what temperature is the most effective and when the system starts to go down hill. I wish they would have designed our intercooler so the water would only pass through once instead of twice...

 

where is the second air charge temp measurement being taken? Is it after the blower or before? The lowest I got was 129 degrees at the second air charge temp location...

here is the thread, it's long... last post from me has the SAC measurements...

http://www.nhtoc.com/forum/showthrea...5&pagenumber=2

Ken

 

1. mph is taken from autotap because my speedometer is off by almost 5 mph at 70 mph...
2. first intake is taken from autotap. It is the temp sensor which is at the air box, or in my case in the filter.
3. second intake is taken from autotap. It is the sensor in the runner for the #2 or #3 cylinder.
4. blower exit is taken from an autmeter probe located in the rear of intake between the blower and the heat exchanger.
5. outside temp is the temperature shown on my overhead console.
6. efficiency is figured by this formula

(blower exit temp-temp of air entering cylinder)/(blower exit temp-temp of air entering the intake)