How high can MAT go?

For discussing MicroSquirt (TM) configuration and tuning of fuel parameters (including idle valves, etc.).
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turbosl2
MegaSquirt Newbie
Posts: 27
Joined: Tue Jul 19, 2005 7:40 pm

Post by turbosl2 »

with no intercooler the charge temps can def be in the 200s since they are not going through a heat exchanger.
snillet
Helpful Squirter
Posts: 48
Joined: Tue Dec 06, 2005 12:43 pm
Location: Sweden / Kungälv

Not only overcharged

Post by snillet »

Not just overcharged engines that goes high on MAT sometimes :lol:

On my Peugeot the airfilter is placed just about 20cm above the exhaust manifold (with a so called heat deflector inbetween) and when i in daily driving get stuck in traffic lines when i drive to work the temp is pending between 75 and 85 degrees C i think 85 degrees C is about 190 degrees F or something like that ?

But i´m ditching that setup soon for an open filter closer to the front of the car instead.

I know that older turbocharged engines (had a 1981 Saab900T8 for a while) runs DARN hot on the intake .... after a while of driving using the turbo a lot you couldn´t touch the intake manifold.....
Peugeot/Citroen XU5 BDZ(4cyl 1.6litre) engine with 60-2 VR wheel decoding singel coil and dizzy spark and Magneti Marelli(solex) TBI. Msns-E hi-res 0.08f and E85(Ethanol) in the gastank.
benflynn
MegaSquirt Newbie
Posts: 2
Joined: Mon May 16, 2005 7:38 pm
Location: birmingham al

Post by benflynn »

i have seen a 355 iat on a dyno, and a real crappy intercooler, i don't think it can possibly be correct
85 Volvo MSnS-e 9.8-1cr T3/T4 lc1
3"ex 500cc 3in intercooler
soon to have ms2
2screwed
MegaSquirt Newbie
Posts: 7
Joined: Thu May 06, 2004 10:52 pm
Location: Amal, Sweden

Post by 2screwed »

benflynn wrote:i have seen a 355 iat on a dyno, and a real crappy intercooler, i don't think it can possibly be correct
I have a twin SC 355 and I know that the temperatures can get this high at high pressure ratios. The SC doesn't care if it's boost or vacuum and you'll have high P/R at idle. If you have a by-pass valve that opens at low loads you can decrease the discharge temperatures there alot. I have both by-pass valve(s) and a decent IC and my iat is not normally over 35-40ºC at 15 psi or at idle. You can see the discharge temperatures at different P/R for a twin screw SC here: http://www.opconab.com/www/files/lyshol ... 3300ax.pdf For a roots the temperatures will be higher than this.

Lars
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