Megasquirt: The ultimate MPG booster!!

[jdbubb at verizon.net (Dan Bubb)]

Take some advice Timbo.
Don't tune it!!!
You tune it and you'll only get the average benefits the rest of us that have Megasquirt, or Haltech, or DTA, or Autronic, or TEC II have been getting.

Also, why don't you install your coolant temp sensor where it'll see the actual engine temp while it's warming up?
Dan

From: "Timbo" <timjmcconnell@gmail.com>
Sent: Monday, May 22, 2006 7:57 AM
Subject: Megasquirt: The ultimate MPG booster!!


Most people upgrade to MS for power reasons. Power is nice, and I
definitely have a lot LOT more of it now. BUT - I got an even better
bonus!!

Remember - this engine just passed 206,100!! It's a JH - 1.8 8v. Still
has the regular vacuum advance distributor.

My baseline MPG was 28.2MPG - doing mixed city/highway. I go really
easy on the car most of the time. I drive in 5th most of the time in
town. It's a 4K transmission.

Well - I'm on my second tank of gas now, clocked in 540 miles so far.

The first tank involved a lot of things like tuning, showing off the
power, seafoaming, and a whole lot of idling, But I still managed
31.5MPG - which is a pretty damn good improvement!! Wouldn't you say?

Driving back from Baltimore from Neptuno's on I-95 however today was
INSANE!!! I got gas in Baltimore... Har har har. Actually - I siphoned
gas from Peter's parts/donor scirocco at Neptuno's house! Free gas!!!
Filled my tank all the way up too! that parts car was a late 84, so it
had the big 12 gallon tank.

My car had more than 3/4 tank after the trip back from Baltimore up to
north Philly here. I filled it up at the gas station to see the
mileage. The trip is 120 miles. Usually I am about 1/3 tank gone at
100miles- but this is highway driving only - average speed I would say
is 75-77 MPH.

So - ~120 miles / 2.8 gallons at the station = 42.1 MPG!!! HOLY CRAP!!

Now - I expected a SMALL mileage increase. BUT THIS IS SICK!! wtf? I
didn't even tune it!!

As far as needed tuning - I need to change my cold start enrichment a
bit - it takes a bit to start in the mornings. Also - sometimes when I
first press the gas - it hesitates a little bit - but only when the
accel_enrich light is on. The o2 sensor goes way rich when that
happens - so I think my acceleration enrichment is too rich for the
car.

The only problem is the megasquirt fuel pump circuit is not working. I
have to do some actual PCB testing on it - but the resistor and the
diode on that circuit are just fine. Weird problem, I think.

-- 
Timbo!
Location: Glenside, PA!
www.vintagewatercooleds.com/tech

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