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VRP Secondary Exchanger Installed, Pics.

 
Old 10-06-2018, 09:51 PM
  #26  
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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.

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Old 10-06-2018, 09:55 PM
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Question: if you are in slow stop and go traffic anyways, whatís benefit of 10-20 degrees lower IATís?
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Old 10-06-2018, 09:56 PM
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Originally Posted by lseguy View Post
Question: if you are in slow stop and go traffic anyways, whatís benefit of 10-20 degrees lower IATís?
so that when someone challenges you, your ready for full power!!!
Fair point
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Old 10-06-2018, 10:18 PM
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Originally Posted by PieRat View Post
so that when someone challenges you, your ready for full power!!!
Fair point
when your stuck in stop and go I noticed when traffic opens up itís still fairly high IATís. Doesnít drop down to were you were before hitting traffic almost a run away effect. I noticed it was getting as high as 120-125 IATís in stop and go and would just kill power. Even after coming out of traffic it was a slow process getting these IATís to decent levels where itís not killing so much power.

I live in Cali and in summer months where itís 100+ degrees you can forget it. I noticed just with my superflow pump as long as I hit no traffic it was able to keep IATís even at those temps 12-15 above ambient. Once in traffic and you come out of it, it would struggle to get it back down and things start falling apart.

Itís almost as if there is a threshold and it does fine if not pushed to extreme heat but once stuck in traffic in 100+ degrees even the superflow pump just is not going to cut it. Granted no one is expecting miracles here with a 2nd heat exchanger and when it gets hot itís hot. Fact is unless you have a killer chiller itís not going to be anything drastic but again in my case Iím very happy with the results.

For what I paid for the heat exchanger I wasnít expecting miracles, Iím not paid to write some great review about it or got anything free or discounted I just know for a fact after looking at my IATís for weeks itís made an improvement in recovery and in stop and go traffic. I would sit there and literally cringe watching the temps climb. Now itís harder for it to climb so quickly and recovers quickly. Is it amazing and made wonders, NO. Did it make a difference in my case, YES.
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Old 10-07-2018, 12:26 PM
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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.
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Old 10-07-2018, 09:29 PM
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If the iat threshold was at 130 stage 1 ,no one would be having these posts and wasting money and time on a 2 nd he or really watching there ait like a hawk .. major issues here small intercooler and to early of a threshold being pulled ..
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Old 10-07-2018, 09:42 PM
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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?
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Old 10-07-2018, 09:59 PM
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Single pass will only help recovery ,but not actual iat rising on wot .The more cooling you do this will be the outcome .You must make the cooler larger and throw a monster pump for it to drop iat wot .In the end everyone is chasing 7 iat which will not win your miracles
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Old 04-15-2019, 01:58 PM
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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.
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Old 04-15-2019, 07:29 PM
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Originally Posted by Tech-Tune View Post
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.
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Old 04-15-2019, 08:04 PM
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I was also wondering that. The single pass mod with a secondary exchanger would probably provide most of the benefit.
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Old 04-16-2019, 08:08 AM
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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.

Last edited by Tech-Tune; 04-16-2019 at 08:10 AM.
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Old 04-16-2019, 06:24 PM
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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..
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Old 04-20-2019, 08:17 AM
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Originally Posted by PieRat View Post
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.
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Old 04-20-2019, 09:04 AM
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Originally Posted by PieRat View Post
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..
i did mine separately all by itself and I will say I believe it did help a good amount with the recovery times
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Old 04-21-2019, 02:15 AM
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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.

Last edited by trabots; 04-21-2019 at 02:29 AM.
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Old 04-21-2019, 02:18 AM
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