jacob502

For those runing Weistec or any other M156 superchargers. Summer is at the doors, which means an increase in ambient air temps.

I am from Qatar and already we are seeing temperatures reaching 95-97F. I did notice a slight drop in preformance on my SL63. When I first installed the Supercharger I raced my bro's modded SLS @ 75F and I was pulling away from him hard more than 100 meters. When we raced again to conduct the video (video I posted), tempereature was around 88-89F. I noticed the distance between him and I was shorter. Most recentley, we raced about two day ago where the temp was @ 95F and he was damn close very close and kept pulling.

In a supercharger there is something called compressor discharge temperature (CDT). Which is directley proportional to altitude and ambient air temperature.

Take a look at this graph (taken from wikipedia):


This is an example of a supercharged engine runing on 10 psi boost. You can see how the compressor discharge temperature increases with increasing ambient air temperature and altitude. When this happens, Hot intake air decreases power, and in turn the mass of intake air is decreased, reducing the efficiency and boost level of the supercharger. I understand we have a great intercooler from Weistec, but still, like in my case where the temperature would reach eventually 115-120F, The amount of air being discharged would require furthur cooling to be implemented and thus loss of power.

One other thing, dont drive your supercharged cars too hard in the summer @ high temps as it may cause detonation which will cause damage (unlikely with the Wesitec SC). It is better to run your engines in a smart and safe manner.

I wont drive mine too much this summer

good luck

Sirex63

So true

Temp over her is giving me a headache. It's 95-105F. Actually, air temp is only one of a couple of weather variables that affect a vehicle's performance. In simple terms, the more oxygen that is available in the air, the more potential there is to make power. Temp, humidity and barometric pressure, all have a significant impact on an engine's ability to make more or less power.

Take a look at the temp starting from today all over the week and that's just the beginning !



So I guess our cars will take a nap this summer. I might just drag it @ night since in a drag race, the engine runs for a minute, does a burn out, full throttle for 11 seconds, idles back in line, and is done for several minutes. Drag usually has more stress on the transmission, diff, and the rest of the drivetrain, than it does on the engine itself. Road course racing is 20+ minutes of full throttle 80% of the time, with some partial throttle, feathering, and engine braking. Much more stress and heat on the engine.

Thanks for the useful thread Jacob.

_AMG_

I think some methanol is in order.
Jacob, are you running the water tank in the trunk?

Sirex63

I already got my trunk ice tank from Weistec as well. It will be installed soon so we can figure out it's improvement in our HOT weather.

Sirex63

Temp just now !

_AMG_

Looking forward to the results.

alrasheed1991

Thats last summer loool and it was 8:41 PM imagine i was out in the day time i think my face will melt

jacob502

Nope. Not yet. I need to get it though. Im getting my Oil/Air seperator soon and will order the Ice tank afterwards.

jacob502

I heard temperature got to 60C in kuwait last year. Thats bad man. We shouldnt drive around exposing our engines in these terrible climates around summer.

cptdaz

With all 'em oil money, you guys should just built a climate controlled indoor track.

Guilty

This.

alrasheed1991

Why not those cars are tested in the hardest condition and especially middle east car i think so i dont think we will face any problems especially with a cooler and water tank their is no way we will face a problem (enshallah )

i made a trip with my car from jeddah (West cost ) to Dammam (East cost ) thats nearly 1500 KM with tempurture out side 100F to 110 F and dusty weather didnt had any problem and was driving 200 - 220 KM had no problems

i may do it again but this time to Dubai with blower this time

cbluerock

Possible solution for heat soaked applications -

I had a 2008 Shelby GT 500 with a large 3.4 liter Whipple and living in hot and humid Houston, it loss tons of power when it warmed up. The heat pulled a lot of timing out of the tune as well. We resolved the issue by performing 3 things:

1. Larger Intercooler Pump (biggest win)
2. Larger heat Exchanger
3. Larger reservoir tank to hold more fluid

We pulled 5 dyno pulls at over 106 degrees outside and never loss power....

SLS Qatar

Mine is still naturally aspirated

I would like to see how all of you supercharged guys would perform with my SLS @ +45C temp

Sirex63

Haven't you reached Bangladesh yet ? Haha

SLS Qatar

sorry but i took the wrong terminal

Sirex63

After installing the Trunk Ice Tank and getting a bigger intercooler i will test it with your car in a hot weather. I believe your climate in Qatar is better than ours and you already witnessed lol

Jon2007E63P30

Supercharged engines, now you need to deal with Otto AND Carnot

http://www.grc.nasa.gov/WWW/k-12/airplane/otto.html
http://www.grc.nasa.gov/WWW/k-12/airplane/carnot.html

jacob502

Thanks for your input, but the carnot cycle does not apply here