Doesnt s class come with a second heat exhanger on the intercooler circuit? Maybe 2 stocks are equal to one aftermarket upgraded H/E. It seemed odd to me that cooler water temps in the cooling circuit supposedly dont equal lower IATs even when the charge air is very hot with this stock intercooler..Why does heat transfer stop just because the difference in temp across the heat sink are large as everybody seems to say?

Is it because the total cooling capacity of the intercooler is(for example) 20 degrees and the charge air from the SC just keeps getting hotter and hotter, so of course post intercooler charge air also rises.

 

 

so that when someone challenges you, your ready for full power!!!
Fair point

 

 

I would like to add some information on this subject. I modified my E55 3 years ago. Eurocharged HE, single pass intercooler and pierburg CWA 100 pump. I also made my own 3/4 pipes for the intercooler.
I installed a pump controller and have Zeitronics data logging with N dash. The SFR electronics controller adds a water temp sensor that I installed in the water pipe at the exit of the intercooler. I can add
that the air intake temp is always within 2 degrees of the water temp.

 

 

But old mate just said water temp of the cooling circuit is always 2deg of his post intercool charge air. That would hint at cooling capacity of the original circuit being the problem. BuT he does have single pass design perhaps that makes large difference?

 

 

I installed 4 heat exchangers, converted my IC into a ceramic coated single pass unit with 12an fittings, installed an 8 gallon trunk tank, and run 2 AMG pumps and couldnt be happier with the cooling and recovery. I started paying close attention after I initially installed my PLM and johnson pump. The additional 3 coolers, trunk tank, and single pass IC make a world of difference.
A major perk is after the cars been parked outside for 30 min or more, 30 seconds after initial startup puts IAT's at or just under ambient.

 

I fail to see how your IATs can get "just under ambient" when the cooling medium is at ambient temp.

 

I was also wondering that. The single pass mod with a secondary exchanger would probably provide most of the benefit.

 

I routed the new system like this: Trunk tank > trunk pump > IC > VRP secondary HE > Drivers single pass HE > Passengers single pass HE > PLM dual pass > Front pump > trunk tank.
When everything was upgraded (the additional 3 coolers, trunk tank, single pass IC, 12an hoses, and additional pump) I filled and bled the system with just over 11 gallons of coolant.
Every part of the cooling system (other than the IC and the lines that lead to and away from it) are located outside of the hot engine temps, so they begin to cool down once the engine is turned off.

I get out of work at 2PM and am home 20 min later. If the outside temp is 60 degrees, my IAT's are between 60-62 degrees on startup, and reach 68-70 by the time I get home. I park it on outside and leave for the gym at 3:10 (40 min later). IAT's start at 58-60 and reach 68-70 when I arrive at the gym 30 min later. This is done in light traffic through urban stop and go with an occasional light blast from light to light. Before the upgrades, again on a 60 degree day, I would start at 10-12 degrees above ambient when leaving work and would be 18-20 above ambient when I get home, and 24-26 degrees above ambient when I got back in at 3:10 and would hover between 18-20 by the time I hit the gym.

As for the recovery I'll punch it, it'll climb to 16-18 above ambient under WOT (1st gear to the middle of 3rd), and cool down to 10-12 above ambient by the time I stop at the next light! I am very pleased with this. This same scenario prior to upgrading the cooling, WOT would be 26-30 above ambient, and recovery by the next light would be 22-24 above ambient. If I went for a second or third pull the temps would increase even more, but with the new cooling the car recovers to 10-12 above ambient after every blast.

Hope this helps.

 

Do you know if the single pass was a big factor in this or did you do the cooling mods all at once? Have read mixed reviews on the intercooler single pass mod..

 

Unfortunately I dont know for sure because it was done in conjunction with other mods. I'm sure it helped, not sure how much though.

 

i did mine separately all by itself and I will say I believe it did help a good amount with the recovery times

 

This was taken cruising when the dash read 25C or 77F. The temp is of the water after leaving a K/C. Over 37F BELOW ambient! The Dodge Demon also uses an evaporator as do most of the 9-10sec blown Commodores and Utes running around down under.