MAX Update No. 28: MPG Heats Up

| 4/29/2009 12:15:17 PM

Tags: MAX, 100 mpg, horsepower, gas mileage, aerodynamics,

I've been on the road for a couple weeks, laptop by my side, weighing the suggestions about pumping up MAX's performance (see Update No. 26 and the numerous comments attached to it).

One that especially sparked my interest was the idea of relocating the turbocharger to the back of the car — the commenter explained the idea in detail and it makes sense. The comment, from Glen2Gs, ended with this:

“… The "Still Born" Top Gear USA television program took a VW Rabbit Diesel (AKA The Sipster) and were able to "tweek" it to 84mpg with a 0-60 time of 7 SECONDS!  

May be time to send the Kubota ... packing.” 

For those unfamiliar with the Sipster project, they took an '81 Volkswagen Rabbit and put in a power plant from an '03 Volkswagen Jetta TDI (diesel). The word “put” is a bit of an oversimplification and waaay out of my skill set, but that's the basic idea. They backed up the engine swap with aerodynamic modifications and got the results quoted above. It's a good story and worth the read, and it got new folks interested in the subject. All in all, I think it's pretty cool.

5/18/2009 8:23:44 AM

Hey great project!! Definitely use the TDI engine. I've also got an '02 Golf that gets great fuel economy. If our heavy, high-drag, box-shaped cars can get 50mpg, then the MAX should be able to get close to 100 easily. Change out the final drive ratio and the 5th gear and you'll really be racking up the MPGs. Also, new ECU tuning and fuel injectors will actually give you more power and economy (if you can keep out of the throttle). There's a 6-speed tranny available from Europe that will also be super-efficient on the top end. If you want to make it rear drive too, I think you should be able use an old Audi as a donor. Check out forums for a great community and wealth of info.

sam strohl
5/16/2009 10:18:08 AM

I totally agree with the heated fuel mileage. I drive truck and have seen this before. One of the major truckstop chains was delivering heated fuel to their truckstops,then this is pumped into trucks already expanded so the trucker got less fuel! A truck can hold between 200 to 300 gallons, Use your math on that! Somewhere between 25-30 gallons at $2-$3 per gallon! The way to solve the overflow problem on trucks was to make it idiot proof. The trucks have round fuel tanks. The filler neck is off to the side of the top of the tank,This leaves about 10% to 12% of air at the top for expansion. Maybe this could help Max,I don't know the shape of your tank.

5/16/2009 4:11:34 AM

I look forward to reading about your progress. You can't imagine how many people are hoping to be able to follow your efforts. You've already succeeded to impress us all in making a fun to drive vehicle that doesn't cost an arm and a leg. What more could we ask. Keep up the good work.

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