39MPG, got it today!! |
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39MPG, got it today!! |
toon1 |
Mar 8 2015, 10:19 PM
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#1
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Senior Member Group: Members Posts: 1,849 Joined: 29-October 05 From: tracy,ca Member No.: 5,022 |
I've been working with Megasquirt with timing and Fueling. The car has been responding well to the changes.
I had to take a trip to the foothills today and decided to take the 914 and really test the changes. Most of the driving I had been doing had been around town so I wasn't sure how the car would respond to a long freeway trip. while cruising up hwy 5 the cht's were 340.....I pulled up Tuner studios and leaned out the area around cruise a bit. Suprisingly the CHT's dropped about 5 * and were stable. I kept the setting there and was wondering how this would be when I started climbing hills, again I was suprised how good the head temps were. nothing over 370(which was for a very short time) on the long climbs. I don't have my 02 sensor connected yet so I can't say what the AFR is. At the end of the trip, I drove 176miles and it took 4.5 gallons to refill....39.1mpg......NICE!!! |
a few loose screws |
Mar 9 2015, 03:03 PM
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#2
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Member Group: Members Posts: 168 Joined: 8-August 14 From: canada Member No.: 17,754 Region Association: None |
Your timing was likely the reason you didn't have any issues with detonation. May not want to advance it more until you can monitor AFR.
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gereed75 |
Mar 9 2015, 04:08 PM
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#3
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Senior Member Group: Members Posts: 1,250 Joined: 19-March 13 From: Pittsburgh PA Member No.: 15,674 Region Association: North East States |
The reason CHT goes down running LOP is that the internal combustion pressure drop significantly. ICP is highest near peak EGT. Again do some research in the aviation world. They run engines in labs and measure all parameters, including ICP The situation is not exactly comparable because airplane engines sit a drone away for hours at a constant speed and load. An auto engine is more critical since throttle settings constantly move, but the theory is the same A short period of intense detonation can ruin your whole day |
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