Quote:
Originally Posted by xp190
I was wondering if anyone has ever heard of this, I did a search on all forums but it came up empty.
any feedback is appreciated.
xp
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Megasquirt is nothing short of wonderful… if you need it.
My first encounter was in 2001 when I put one on a 1972 GTB4 Daytona coupe Ferrari. Heat soak had warped the 46 mm Webbers (a common fault of V-12 engines in Lambos and Ferraris) . I used the old carbs for the ease of installing EFI injectors, the linkage didn’t need modification, and the air cleaner would still function. I had to add a Motronic speed sensor, crank position sensor, OXY sensor, cyl head temp sensor, and air intake sensor using factory Porsche parts. It took two weeks to dial it in with a 5 gas analyzer, a PC laptop, and a chassis dyno. The first time you do a job is always the hardest, eh?
Four replacement carburetors cost $8,500. The complete parts bill for the Megasquirt was under $2,500. Labor was around $10,000. He still drives it and it has only required normal maintenance. We have converted seven carbureted V-12s so far. Last year we converted a 2008 Lamborghini Murcielago to the Megasquirt system and it was almost too easy. Only the Bosch injectors were replaced with higher flow units.
In 2004 they upgraded their unit to give a more precise control of the injector pulse width, timing control including a retard controlled by knock sensors, and CAN capabilities. This allows the use of much higher flow injectors and still has a livable idle.
I converted my 1978 930 in 2006 and discarded the crap CIS system and dinky camshafts for EFI with 935 MFI cams. Starting with 3.5 liter twin plug, single turbo that put out 340 HP, it turned into a fuel guzzling 460 HP.
Several years ago I built a SBC bored and stroked (to 408 CI) with a single Holley 850 double pumper. It put out 538 HP with 530 lbs of torque. With the Megasquirt conversion it put out 640 HP and 580 lbs of torque. It idles @1200 RPM and sounds like a B gasser but it’s very smooth to drive. 6-8 MPG
Within the next year I will install a similar SBC in my 1976 930. With a total curb weight of 2,550 pounds, it should be a fun car.
The new offering from Megasquirt is even more advanced and seems to aim at late model factory computer controlled cars.
I found a little trick that may be useful to those of us concerned with fuel economy. My 1986 911 3.2 liter twin plug gets 16-18 MPG city and 20-22 MPG highway. When I short the barometric cell, the engine thinks it is at high altitude and leans the mix. On the way to Vegas I get 28-30 MPG but with the A/C on, I must keep an eye on the engine heat (oil temp in a Porsche) and the pyrometer.
If you understand how the late model computer controlled cars work, you won’t have too much of a problem using the Megasquirt. I usually commit five different maps to memory and it takes about five minutes to choose and install one.
I have a California smog license and I know just how to use/abuse it .
