Intercooler temps huh??
Turbo Mini Forums

Hi Guys,

finally got a temp setup in the intercooler piping (just before the carby and plenum)

Its very odd. I actually get temps inside the intercooler piping COLDER than ambient temps... is that right? Is that possible?

The temp guage controller thingamajiggo is a unit with dual temp sensors. One measures off a little probe (which is inside the intercooler pipework) and the other off the actual unit (which is inside the car)

Today it was 22deg C inside the car and intercooler temps on boost were 19deg C
Last night was very cold here (nothing for you lot) and was 18deg C inside the car and got down to 11deg C inside the intercooler piping.

Only after heat soak (engine sitting idling for a while and then turn it off... then 10min later start the car again) then the intercooler pipe temp is same or a little higher than inside the car.
However as soon as you start driving, the intercooler temps drop.

Thanks,
Peter

PS: The temp guage range is -50deg C --> +80deg C

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The ambient temp gauge is inside the car??

lol, Stick your head out the window.. feel colder??

But anyway, strange that your temps don't rise at least a bit when you get under full boost.. does the intercooler temp rise at all??

You havn't got it in the inlet piping have you?? sensor needs to be between the intercooler and the carb.

Terry

Edited by Turbo Tel on 25th Sep, 2008.

website:- http://www.terryhunt.co.uk

Hey mate, yes its between the intercooler and the carby (its just before the plenum.

Sorry, dont get me wrong, it DOES rise with full boost but really doesnt get hotter than inside the car, I have not had it on full boost for very long though, so it would prolly rise quick.

As a comparison, that was yesterday. Just went to lunch, parked in the sun deliberatly and the temp in the car was 30deg C... and the intercooler temp was 39.1deg C started her up, drove about 200m in the shade (no boost) and then down to work around 5kms and gave it a thrashing... the ambient temp dropped to 26deg C and intercooler temp to 22.3deg C max!
I cant compare properly because the guage unit has a built in temp sensor in the actual unit... so unless the unit is outside it reads inside the car.
Windows are open, and the thing doesnt really seal properly anyway... yes its probably colder outside...

But again, say its reading inside the car... if I work out rough then the intercool is usually the same or colder then outside ambient temps.

I 'thought' that you would ALWAYS see higher temps in the piping/plenum than outside - no matter what... ie/ that the intercooler cant be that efficient. The piping is cold to touch when you stop.

Pete

1132cc Turbo ~120 bananas ATW - Fun Fun Fun

Are you experiencing high humidity at the moment?

It's like licking the back of your hand, then blowing on it. You can feel the effects of the evaporation of the saliva.

It's all about the wet-bulb temperature.



However, you should see a higher temperature on boost, even with a very efficient intercooler.

Are the sensors properly calibrated?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

How much boost?

Temperatures are always going to be warmer than ambient inside the car (unless you've got air con.Lol), So you're not really measuring ambient temps at all?

You'd be best to get a sensor than measures the inlet temps before the turbo.

You could take the temp sensor out leave it for a few mins take a reading then put it back in, and take the car for a drive and compare. That would be more accurate than your current setup and should give an idea on your IC efficiency.

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1/4mile in 13.2sec @ 111 terminal on 15psi

remember it will be colder, stick your hand out the window it cools down from the forced air, as it going onto the intercooler its cooling the charge temp down. it sounds perfectly normal to me

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Could it be that your resistance v temp curve is out and you're actually seeing the effect at the gauge ? There are threads on TM about this.

I've previously posted a Temp v Resistance profile for MPi and SPi sensors if it helps.

How have you loaded the resistances into your system against the temperatures indicated ?

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When you parked the car with a hot engine I would have thought that 39 degrees was a bit low, sun or not the engine bay should be hotter than that, maybe get another temp sensor ( I use an infrared one that you can just point at the pipes) and crosscheck the readings.

Terry

website:- http://www.terryhunt.co.uk

i think it sounds normal to me, as long as no real boost.

Even taking into consideration the wind chill factor I would be very doubtful you could get the temps to read below ambient if you are taking the readings inside the engine bay because of heat soak. I would try comparing the readings of the sensor with another temp sensor like Tel says. Those infrared sensors are damn handy.

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1/4mile in 13.2sec @ 111 terminal on 15psi

have to be careful with those infra red sensor's, emmisitivity (or how the fook you spell it) makes a MASSIVE difference.

We've got a £1k one for work (and thats only really a cheap one compared to most of this technology) and its only used as a rough guide to compare one area to the next.

I have access to the temp meters you talk about, ill do that and see what the temps show.

Yes, it is high humidity at the moment... so my thought was that too... maybe its 'cool' in there.

The temps DO rise on boost, around 5-6deg C usually... so all in all I have my intercooler temp (before carb) roughly the same as the actual ambient temp on the day - not ambient temp direct as that would throw it due to wind chill, etc.

Ill double and triple check with a couple of other meters... just to be sure. I was expecting VERY high temps, so if its even close (within 10deg c I am still happy... that means the intercooler is going its job pretty well.

Pete

1132cc Turbo ~120 bananas ATW - Fun Fun Fun

Hi,
The best way to check I/C efficiency is to use 2 sensors one before and one after the I/C.
A really efficient turbo would put less heat into the charge meaning lower temps post I/C too.
Cheers,
Gavin :)

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