Driving around in my automobile, The 3.2 giving me about 32 mpg. Flipped HB |
|
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. |
|
Driving around in my automobile, The 3.2 giving me about 32 mpg. Flipped HB |
worn |
Sep 29 2024, 05:20 PM
Post
#1
|
can't remember Group: Members Posts: 3,326 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest |
I been driving my 914 this summer. Closing in on 5 Kim so far this year. When I go, I get the highest octane that I can find; 91 or 92 with no EtOH where I live, trending towards more ethanol as we get west. So, I have been old guy writing down the numbers and have consistently hit 31 -32 mpg. This decreases if I leave my gas cap off just before a drive with the RRC 2024 folks.
The interstates let you drive at around 80 mph, and that adds up to a light throttle 3,000 rpm with my gears. The car must be pretty good with airflow. |
mepstein |
Sep 29 2024, 05:26 PM
Post
#2
|
914-6 GT in waiting Group: Members Posts: 19,583 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
Light weight really helps.
|
technicalninja |
Sep 29 2024, 06:40 PM
Post
#3
|
Senior Member Group: Members Posts: 1,961 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region |
If you're hitting those numbers via gallons/miles calculations and that is the AVERAGE you're kicking ass on the economy numbers.
I believe you are beating the 4-cylinder factory numbers by 20% with nearly three times the power... That's high enough mileage that I would want to see the AFR numbers. I'd be worried about being too lean. Still really good mileage numbers! |
Front yard mechanic |
Sep 29 2024, 08:22 PM
Post
#4
|
Senior Member Group: Members Posts: 1,222 Joined: 23-July 15 From: New Mexico Member No.: 18,984 Region Association: None |
Isn’t that a Chuck Berry tune
|
930cabman |
Sep 30 2024, 04:52 AM
Post
#5
|
Advanced Member Group: Members Posts: 3,651 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States |
I been driving my 914 this summer. Closing in on 5 Kim so far this year. When I go, I get the highest octane that I can find; 91 or 92 with no EtOH where I live, trending towards more ethanol as we get west. So, I have been old guy writing down the numbers and have consistently hit 31 -32 mpg. This decreases if I leave my gas cap off just before a drive with the RRC 2024 folks. The interstates let you drive at around 80 mph, and that adds up to a light throttle 3,000 rpm with my gears. The car must be pretty good with airflow. The way life should be |
worn |
Sep 30 2024, 06:47 PM
Post
#6
|
can't remember Group: Members Posts: 3,326 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest |
I been driving my 914 this summer. Closing in on 5 Kim so far this year. When I go, I get the highest octane that I can find; 91 or 92 with no EtOH where I live, trending towards more ethanol as we get west. So, I have been old guy writing down the numbers and have consistently hit 31 -32 mpg. This decreases if I leave my gas cap off just before a drive with the RRC 2024 folks. The interstates let you drive at around 80 mph, and that adds up to a light throttle 3,000 rpm with my gears. The car must be pretty good with airflow. The way life should be I am a very law abiding driver in general, and the fifty five limit saved both gallons and lives. With all of that said, I saw almost no speeding on the interstates with the high speed limits. Maybe with so many miles to cover in this amazing country sometimes people just watch things go by and wait out the distances. As for that, I am grateful for my 914 to ride in. |
brant |
Sep 30 2024, 06:51 PM
Post
#7
|
914 Wizard Group: Members Posts: 11,778 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
I been driving my 914 this summer. Closing in on 5 Kim so far this year. When I go, I get the highest octane that I can find; 91 or 92 with no EtOH where I live, trending towards more ethanol as we get west. So, I have been old guy writing down the numbers and have consistently hit 31 -32 mpg. This decreases if I leave my gas cap off just before a drive with the RRC 2024 folks. The interstates let you drive at around 80 mph, and that adds up to a light throttle 3,000 rpm with my gears. The car must be pretty good with airflow. I get around 32 with a stock djet. But at 4k on the highway… close to 90 with 16 inch wheels And keep a paper log book of gas stops like a normal person should…. (IMG:style_emoticons/default/biggrin.gif) |
emerygt350 |
Oct 1 2024, 02:30 PM
Post
#8
|
Advanced Member Group: Members Posts: 2,476 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
My 2056 gets about 20 in town, maybe 27 on a really good day on the highway. Anything over 60 starts to pull at that number. I have come to grips with that. It's still better than the 12 mpg I get with the mustang in town and 14 mpg I get with the explorer in town. Highway on those is 22 and 24 respectively.
Do I drive like grandma? Hell no. If you aren't playing in the 3k to 6k rpm range why are you driving a 914? If my mustang had a manual I can't even imagine how bad my mpg would be in that car. Oh, and I used to get far better mileage before the cht and afr gauge. I like my heads, I don't want to buy new ones. Truth be told I can't even get good mpg in the mini. I just can't drive that way. The volt, another story entirely. |
scallyk9 |
Oct 1 2024, 03:00 PM
Post
#9
|
Member Group: Members Posts: 337 Joined: 16-October 16 From: Port Orchard, WA, USA Member No.: 20,499 Region Association: Pacific Northwest |
I envy you. I have a 74 914 with an '87 Carrera 3.2L engine with Motronic FI and 916 Transaxle with Guard LSD. And I'm only averaging 22 MPG over the last 4000 miles including lots of time on Interstates. This was not unusual for the Carrera it came out of but I should be doing better.
|
emerygt350 |
Oct 1 2024, 03:32 PM
Post
#10
|
Advanced Member Group: Members Posts: 2,476 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
I envy you. I have a 74 914 with an '87 Carrera 3.2L engine with Motronic FI and 916 Transaxle with Guard LSD. And I'm only averaging 22 MPG over the last 4000 miles including lots of time on Interstates. This was not unusual for the Carrera it came out of but I should be doing better. Not if you are having fun.... |
Geezer914 |
Oct 1 2024, 04:52 PM
Post
#11
|
Geezer914 Group: Members Posts: 1,751 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States |
My 2056 gets around 24-25 mph at 3400-3500 rpm. AFR is around 13.2-13.4. Check your plugs to make sure you are not running lean.
|
930cabman |
Oct 1 2024, 05:06 PM
Post
#12
|
Advanced Member Group: Members Posts: 3,651 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States |
My 2056 gets close to 35 mpg cruising at 75 - 80 mph. Twin Webers (IMG:style_emoticons/default/piratenanner.gif)
Flat terrain and a constant throttle opening help |
technicalninja |
Oct 1 2024, 05:46 PM
Post
#13
|
Senior Member Group: Members Posts: 1,961 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region |
My 2056 gets around 24-25 mph at 3400-3500 rpm. AFR is around 32-34. Check your plugs to make sure you are not running lean. Your AFR numbers are different than mine. Air/Fuel ratio is usually based on air by weight/fuel by weight and stoic is 14.7/1 Often folks leave off the one. 14.7 is "perfect" combustion with exactly the right amount of oxygen to fuel for complete combustion of the fuel with "hopefully" the least amount of CO and HC being produced. 12.5 is rich, normally a max power mixture. 10.0 is PIG rich 16 is getting lean, some cars will do OK running 16. This is the beginning of "lean burn" IMO. You only want to see as high as 16 in cruise at speed. 18 is dangerously lean. A few max effort fuel economy vehicles run this high. You need computer controlled hyper fast FI with multiple knock sensors to make this work. Run an old school T4 with carbs at these numbers and you will MELT stuff... What does 32-34 refer too? The mileage numbers that members have been posting are interesting. Even seriously modified cars can achieve decent numbers if driven in a "highly responsible" manner. And that is NOT how I'd drive those cars. (IMG:style_emoticons/default/devil.gif) |
emerygt350 |
Oct 1 2024, 07:12 PM
Post
#14
|
Advanced Member Group: Members Posts: 2,476 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
I try to keep my cruise AFR between 13 and 14, but closer to 13. I think my air dam and such doesn't do any favors for mileage. That 6 might be hardly working moving a 914, however I would still want to know my head temps and AFR, and my engine won't cost 20k to rebuild.
|
rick 918-S |
Oct 1 2024, 07:59 PM
Post
#15
|
Hey nice rack! -Celette Group: Members Posts: 20,740 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region |
HB gears in the 901 in the Alien. /i don't track mileage but it has to be good since I was able to tune the CIS.
|
mlindner |
Oct 2 2024, 09:59 AM
Post
#16
|
Senior Member Group: Members Posts: 1,568 Joined: 11-November 11 From: Merrimac, WI Member No.: 13,770 Region Association: Upper MidWest |
Worn, I just did the Waumandee Hill climb/time trial last weekend. 2.3 miles with 400 ft elevation. Very fast, want to go next year. Mark
|
Literati914 |
Oct 2 2024, 10:00 AM
Post
#17
|
Senior Member Group: Members Posts: 1,703 Joined: 16-November 06 From: Dallas, TX Member No.: 7,222 Region Association: Southwest Region |
On the subject of AFR and mileage - I remember watching a video on YT, where the driver of an old school 911 (while basically being interviewed by the channel's host), running thru the twisties of some northern California mountain roads - would manually change the A/F ratio on the fly via a knob he had installed between the seats!!
I think he may have been running carbs but can't exactly remember. I thought that was kind of a slick solution and may try to mimic it at some point. Anyone heard of this before? Know how that could be done? |
emerygt350 |
Oct 2 2024, 10:37 AM
Post
#18
|
Advanced Member Group: Members Posts: 2,476 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
I set that up on my car. Very easy with d-jet. All you need to do is modify the resistance detected at the cht. I used a Bluetooth switch. Didn't keep it because it didn't affect head temps as much as I was hoping.
|
brant |
Oct 2 2024, 03:54 PM
Post
#19
|
914 Wizard Group: Members Posts: 11,778 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
On the subject of AFR and mileage - I remember watching a video on YT, where the driver of an old school 911 (while basically being interviewed by the channel's host), running thru the twisties of some northern California mountain roads - would manually change the A/F ratio on the fly via a knob he had installed between the seats!! I think he may have been running carbs but can't exactly remember. I thought that was kind of a slick solution and may try to mimic it at some point. Anyone heard of this before? Know how that could be done? Can’t change AFR on the fly with carbs As it would require a jet change on the carbs Easy with djet Possible with modern injection |
Geezer914 |
Oct 2 2024, 04:21 PM
Post
#20
|
Geezer914 Group: Members Posts: 1,751 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States |
My 2056 gets around 24-25 mph at 3400-3500 rpm. AFR is around 32-34. Check your plugs to make sure you are not running lean. Your AFR numbers are different than mine. Air/Fuel ratio is usually based on air by weight/fuel by weight and stoic is 14.7/1 Often folks leave off the one. 14.7 is "perfect" combustion with exactly the right amount of oxygen to fuel for complete combustion of the fuel with "hopefully" the least amount of CO and HC being produced. 12.5 is rich, normally a max power mixture. 10.0 is PIG rich 16 is getting lean, some cars will do OK running 16. This is the beginning of "lean burn" IMO. You only want to see as high as 16 in cruise at speed. 32-34 it is supposed to be 13.2-13.4 AFR. 18 is dangerously lean. A few max effort fuel economy vehicles run this high. You need computer controlled hyper fast FI with multiple knock sensors to make this work. Run an old school T4 with carbs at these numbers and you will MELT stuff... What does 32-34 refer too? The mileage numbers that members have been posting are interesting. Even seriously modified cars can achieve decent numbers if driven in a "highly responsible" manner. And that is NOT how I'd drive those cars. (IMG:style_emoticons/default/devil.gif) |
Lo-Fi Version | Time is now: 6th November 2024 - 01:34 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 ... |