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NPR performance (data logged and graphed)

Gene_GaTech

Gene_GaTech

Round Fender Spender?
Joined
Apr 22, 2005
Location
Bay Area, California
Hey guys,
Well i've had this NPR in my car for a while and at my job the techs(and sometimes I) use hobo loggers to gather HVAC data from buildings. I grabbed a 4 channel logger, 4 thermistors, and took them home. The response time on the thermistors sucks ( they are for hvac, nothing changes fast) but this would definitely give me a good idea of how decent the NPR works.

I logged it for about half an hour, kept having a hose pop off ( i now have a check engine light, reminding me of my stupidity).

SO, the long awaited QUANTIFIED results


I took 4 readings
intake (inside the airbox)
hotside ( turbo-side of the intercooler)
coldside (engine side of the intercooler)
and i stuck a thermistor by the radiator for ****s and giggles

car specs:
1990 740 Turbo 13c
large NPR
VX cam
mvp throttle body,
3": turbo back 1 cat no mufflers out the side
Fred Chips
m46
14psi

so you can see the intake temp definitely rises with driving time

The engine side of the intercooler is great, steady and cold. The hotside and the rad temp are seem related. The spikes are probably where the intake hose kept blowing off, i had to pull over kill the motor and tighten it back up. This led to the fan not running to cool the car and the intake temps to decrease as the car was not running.

If people are really interested i can redo this under more controlled environment as i learned a lot this time. ALSO if there are people in the DFW are that have other intercooler types (esp stock and 93+ types) and there is interest i would love to log them too.


1airlog.JPG


Average temp difference between intake and engineside of the intercooler
4.8 F

Average amount turbo is heating the air
51 F
 
Last edited:
Nice work with the research. It's always nice to have hard data on a mod, when so many people just mod their cars and don't mention quantifiable results.

It'd be even nicer to know what boost you were running though. On a 13c, that can change the air temps from near ambient to 150*+.
 
psi added (14)
and the ambient temp is the intake temp. Thats the temp the amm was seeing so thats what we care about. The airbox is just blocked off from the heater, but other than that its totally stock.
 
adam_c said:
so what was the ambient air temperature?

are you running a totally stock airbox, or is it modified in any way?

ideally an intercooler should bring the cold side temps close to ambient (obviously the closer, the better), so we need to know how hot it was outside!! :) :)
Click to expand...

His location is in Atlanta. So, going by summertime temps in the Atlanta area which are 90-100 degrees F. The intercooler is cooling the air close to ambient.

Thanks for the testing info Gene. Knowing that the NPR is a low resistance design it's good to know it cools very well, too.
 
^^ Yes indeed. I'm actually in Dallas, TX now. So i need to change that on my profile.
I remember, just by switching IC, i picked up like 6 psi by leaving my mbc where it was. So its a great budget intercooler. And seems like you'd be hard pressed to find something MUCH better.
 
This seems to confirm my suspicions that over time a certain portion of the system can heatsoak. Based on what I'm seeing, the IC is a heat sink! :omg:
 
Oooohhhhhh!!!!!! Never mind what I just said. It looks like I was reading it wrong! :oops:

It would seem that intake temp should remain constant. What's going on here?
 
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