39MPG, got it today!! |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
39MPG, got it today!! |
toon1 |
Mar 8 2015, 10:19 PM
Post
#1
|
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!!! |
toon1 |
Mar 9 2015, 12:35 PM
Post
#2
|
Senior Member Group: Members Posts: 1,849 Joined: 29-October 05 From: tracy,ca Member No.: 5,022 |
Where's Jake???
I remember him mentioning a while back that it's possible to lean these engines out more than people think. |
gereed75 |
Mar 9 2015, 01:18 PM
Post
#3
|
Senior Member Group: Members Posts: 1,260 Joined: 19-March 13 From: Pittsburgh PA Member No.: 15,674 Region Association: North East States |
There is tons of info in the aviation world about running air-cooled flat fours - Lycoming IO 360 - in the lean of peak ranges (LOP) for EGT. Google LOP Lycoming IO 360 or go to the Van airforce webpage and you will find volumes. The bottom line is that EGT's around 30 - 100 F LOP will reduce CHT's with a small reduction in peak power. Detonation is an issue and monitoring CHT is a pretty indirect way to see it. It works but be careful. |
toon1 |
Mar 9 2015, 01:50 PM
Post
#4
|
Senior Member Group: Members Posts: 1,849 Joined: 29-October 05 From: tracy,ca Member No.: 5,022 |
There is tons of info in the aviation world about running air-cooled flat fours - Lycoming IO 360 - in the lean of peak ranges (LOP) for EGT. Google LOP Lycoming IO 360 or go to the Van airforce webpage and you will find volumes. The bottom line is that EGT's around 30 - 100 F LOP will reduce CHT's with a small reduction in peak power. Detonation is an issue and monitoring CHT is a pretty indirect way to see it. It works but be careful. Detonation?? Are you and wndsfr referring to engine failure??? If so, This is not the case here. I think that I "may" be in the area of 15:1 AFR, if that. My 02 sensor should be done this w/e. I'm going to leave the settings where they are and check it. From what I recall Jake saying a few years back was, 15:1 is more than doable with these engines. |
Lo-Fi Version | Time is now: 10th June 2024 - 06:08 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |