Sent it from the wrong account so it bounced. Great feedback Mitch. It is really just a packaging issue and maximizing > frontal area on the car. I cannot fit a decent air to air coooler up there > due to the curve of the bumper fascia and the existing bumper. > > I will likely add another smaller water cooler in parallel in front of the > right front wheel, from an M4 or M5. > > Only two differences I can think of from the Cruze. One is boost. I will > be running up to 3 bar of boost, like 45 psi. That is a lot more heat than > 19psi, assuming similar motor displacement and rpm. My setup will require > up to 80lb/min at full trot, which I do not plan to explore very often, but > I keep thinking that going up the grapevine when it is 90 degrees out with > kids and wife and a car full of luggage and the AC on might want a lot of > intercooler. That is pretty much my worst case scenario in terms of heat > dissipation, unless I take it out on a road course, which would be a lot of > fun and is sort of my gold standard for performance. > > There are more variables to chase with air to water. Namely the water flow > and the pressure/flow curve on the fluid pump. Most of the pumps used are > low pressure, high flow. The heat exchangers become the bottleneck, mostly > the radiator. So you need a good higher pressure pump like a Pierburg 50 or > 100 series to make the required flow happen at 1 bar or whatever. I think > some of the higher end mercs use them, and BMW also. This is only if you > want it to keep up with the heat input at high sustained power output. > Otherwise, for short bursts of power, a big tank of water does the trick > with a crappy pump. > > I plan to fully instrument the thing. Unfortunately I have to add the > whole setup to the car, as none of the required sensors are in place, e.g. > TPS, IAT, ambient temp, pre/post intercooler water and air temps. And the > turbo rpms to see where it is running on its map. I should be able to > calculate cooler and turbo compressor efficiencies for both turbos. > > Thanks again for the graph. Cool Cruze! (but no diesel? What kind of motor > does it have?) > > > > On Wed, Dec 26, 2018, 4:04 AM Mitch Haley via Mercedes < > mercedes@okiebenz.com wrote: > >> >> > On December 25, 2018 at 7:55 PM Karl Wittnebel via Mercedes < >> mercedes@okiebenz.com> wrote: >> > >> > >> > Switching to air/water. Not stock. Maybe people have some input on heat >> > exchangers... >> > >> > https://youtu.be/kjTc9UYTlFk >> > >> >> I find it hard to get excited about water/air. >> If I had a rear or mid engine car it might be necessary. >> >> Attached is a screenshot of a 8 second full throttle hillclimb in a 195hp >> gasser at 19psi boost with a factory A-A intercooler smaller than the one >> that came with the 1999 E300. >> Pic of cooler: https://www.gmoutletparts.com/oem-parts/gm-cooler-39116550 >> I can measure the cooler if you want. >> >> Ambient temp was 30-32 degrees F, manifold temp actually dropped from 43 >> to 39 during the run as the car accelerated to 70mph. Water temp stayed >> pretty constant at 181-183. >> If manifold temps with that little A-A are about 10 degrees above >> ambient, I don't think you're going to beat that with W-A unless you're >> towing heavy loads at low speed and have a lot of room up front for coolers. >> >> With an unladen car, you simply can't keep your foot in it for long >> without airspeed reaching 'wow, look at that >> cooling'._______________________________________ >> http://www.okiebenz.com >> >> To search list archives http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> >> _______________________________________ http://www.okiebenz.com
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