When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I wanted to come back and update this thread after having done this mod for a few months. When i first do it, after a drive my reservoir would become empty after i parked it over night, it went empty twice and on the third time of refilling the reservoir, it hasn't been draining again. Makes me think i had little air in my system and since it's been drawing the coolant back, it's filled those pockets. My IATs hover around 110-120 on an 85f day, after a few pulls it would stay the same, it only climb to 160+ when it's bumper to bumper traffic, but as soon as the car moves again then temps go back down quick.
I am a bit confused. The creator of this thread says this mod removes or removed all air from his system and kept it out. Others here have stated it wont do that.. so whats the verdict?
I don't think it will remove air that's already in the system. You will have to have it vacuum bled as before. What it does do is prevent the system from sucking air back in. I've watched the fluid level in my reservoir. It never varies by more than maybe 1/4" or so, but it does vary.
This modification definitely bleeds the entire system but it takes time. It will take multiple heat cycles to expand the air in the intercooler system which gets pushed out through the wilwood reservoir. When the system cools back down it draws the liquid back in. I have been running this system for years now and every time I take off the intercooler radiator cap it is 100% full of coolant. Before adding the reservoir there was always a bit of air under the cap, I always fought with getting the system bled.
This modification definitely bleeds the entire system but it takes time. It will take multiple heat cycles to expand the air in the intercooler system which gets pushed out through the wilwood reservoir. When the system cools back down it draws the liquid back in. I have been running this system for years now and every time I take off the intercooler radiator cap it is 100% full of coolant. Before adding the reservoir there was always a bit of air under the cap, I always fought with getting the system bled.
This modification definitely bleeds the entire system but it takes time. It will take multiple heat cycles to expand the air in the intercooler system which gets pushed out through the wilwood reservoir. When the system cools back down it draws the liquid back in. I have been running this system for years now and every time I take off the intercooler radiator cap it is 100% full of coolant. Before adding the reservoir there was always a bit of air under the cap, I always fought with getting the system bled.
I believe you’re right. I recently had to open up the low temp circuit and drain most of it. I did what I could to fill it up afterward, but doubt I got it totally bled. I removed the cores from the bleed fittings and ran hoses from them to the filler neck, and used DAS to turn on the pump for several minutes. Anyway, the system has been fine, it sucked in a few ounces from the reservoir I added last year and is completely full. The intercoolers are just slightly warm after engine shutdown. It’s a win.
This modification definitely bleeds the entire system but it takes time. It will take multiple heat cycles to expand the air in the intercooler system which gets pushed out through the wilwood reservoir. When the system cools back down it draws the liquid back in. I have been running this system for years now and every time I take off the intercooler radiator cap it is 100% full of coolant. Before adding the reservoir there was always a bit of air under the cap, I always fought with getting the system bled.
The newer v12tt cars have a very similar set up.
Best of luck to all.
This is great news!!! Now I don't have to build that vacuum rig!!!
TerranceSl65: I just PMd you: Would you kindly share the list of parts you used to accomplish your reservoir build, please?
just do the update the factory ended up doing for the M279 revision. It fits and looks like OEM and it keeps the system free of air. The list of parts you’ll need is listed below:M275 IC reservoir upgrade
A2792000185 Tank
A2790980891 pipe to tank
A2790980283 rubber hose Ends up looking like this.
just do the update the factory ended up doing for the M279 revision. It fits and looks like OEM and it keeps the system free of air. The list of parts you’ll need is listed below:M275 IC reservoir upgrade
A2792000185 Tank
A2790980891 pipe to tank
A2790980283 rubber hose Ends up looking like this.
Any suggestions on vendors that sell these parts? I tried looking it up and only found 1 source from Europe?
Hello, new 2007 SL65 owner here, thanks for this find. Looks like it’s about $224 for all three. My question is I assume a cooler running system, are there other benefits to performance? My car is stock but thinking of doing kleemann ecu tune, downpipes BMc air filters to start. Thanks. Darrick
Hello, new 2007 SL65 owner here, thanks for this find. Looks like it’s about $224 for all three. My question is I assume a cooler running system, are there other benefits to performance? My car is stock but thinking of doing kleemann ecu tune, downpipes BMc air filters to start. Thanks. Darrick
I have tested all possible
all you mentioned is perfect
then in terms of cooling, start with the Weistec water/meth kit. you might skip the cooling after you see the result
just insane
Hello, new 2007 SL65 owner here, thanks for this find. Looks like it’s about $224 for all three. My question is I assume a cooler running system, are there other benefits to performance? My car is stock but thinking of doing kleemann ecu tune, downpipes BMc air filters to start. Thanks. Darrick
Darrick,
Adding the new expansion tank for the low temp circuit won't make any difference in your temperatures, assuming you don't have air in your low temp (intercooler) circuit to begin with. It does nothing to change the way that system works. All it will do is keep the system from sucking in air. If that happens, you will soon find your low temp circuit partially empty, and your IAT will suffer because the intercoolers won't get enough water circulating. In a perfect world, this wouldn't be an issue -- the low temp circuit won't get hot enough for the coolant to expand and vent from the fill cap. Well, we don't always live in a perfect world, which Mercedes seems to have eventually figured out.
Hello, new 2007 SL65 owner here, thanks for this find. Looks like it’s about $224 for all three. My question is I assume a cooler running system, are there other benefits to performance? My car is stock but thinking of doing kleemann ecu tune, downpipes BMc air filters to start. Thanks. Darrick
no, it’s not really about adding performance per say as it is more about keeping the performance you’re supposed to always have as intended from factory.
If you read on this forum enough about these cars, you will soon find out that the original design as you have in your car right now is flawed. The flaw is the lack of an expansion tank to allow water to expand to somewhere as it heats up during operation. The original design (again, as it sits in your car right now) does not allow for this and what happens instead is that the water expands and lifts the relief valve on the cap between the two intercoolers and escapes. Later as the system cools down, air replaces this coolant that escaped. This air, forms air pockets which prevent efficient and at times, even blocks proper circulation. This in turn, leads to heat soaking and high intake air charge temperatures which in turn, force the engine ecu to retard timing and add fuel in order to keep the engine from detonating.
This all means that original performance is reduced by not having this update. AMG introduced this update in 2014 when the engine was revised and re-named M279. My opinion is that this is a must do in order to make the car more reliable before one starts adding tunes and other mods. Unless you’re doing something completely mind-blowing like @pmercury , you’re more than likely stuck using the stock intercoolers so... do this mod/update and upgrade the circulation pump and you’ll be at a good starting point.
Good luck on your build and start reading through this forum!!! Knowledge is power....Horsepower!!!!
Hi,
A quick one as I could not find details in the manual as to how much MB coolant to use in the interecooler circuit....., any idea in Litres ?
Also do I use the MB unmixed coolant for this, or 50/50 with filtered water ?
Regards,
Grant.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
