Yes an egt probe is sort of a given with any added fuel. I may do a boost controller to the alda pressure to regulate how and when it adds fuel.
With adequate intercooling, adding air (increasing AFR) cools the egt, so maintaining 17:1 or higher is the goal to prevent excessive smoke. It would run a bit cooler at 18:1. On Thu, Dec 27, 2018, 6:43 AM MG via Mercedes <mercedes@okiebenz.com wrote: > Make sure you have EGT. 45psi is way up there > beyond piston melting range. might need > water/methanol injection also. > > Karl Wittnebel via Mercedes wrote: > > 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 > > > > 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 > > 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 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
