Injector kill switch for Autos - Page 2 - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 10-08-2009, 11:49 AM   #11
Registered Member
 
Dr. Jerryrigger's Avatar
 
Join Date: Sep 2009
Posts: 196
Country: United States
I spliced some long wires into the signal wires, ran them threw a hole in the firewall, and to the DMM in my cup holder.

Anyway the planned test wasn't going to give any useful results, and there was far too much traffic. It seemed to only turns off over 35mph, but then I tried down shifting... My car seems quite quick to respond, under a sec to see change in the O2 reading from .335V(where it like to stabilize) to .450V.
The thing to determine is how much can we push the envelope on the lower RPM range past what the computer allows (engineers almost always give things some cushion room to prevent problems)
The thing that I learned from this test is that down shifting can really save fuel with some cars. It was cutting off even under 20mph if in 2nd.
__________________

Dr. Jerryrigger is offline   Reply With Quote
Old 10-08-2009, 12:17 PM   #12
Registered Member
 
GasSavers_BEEF's Avatar
 
Join Date: Apr 2008
Posts: 1,831
it doesn't cut off at a particular mph but a particular rpm. that is what to look for.

the scangauge will show you this without having to splice wires or pull out ye olde fluke meter. I know I keep pushing this but you can see actual open/closed loop along with instantaneous mpg. I have been meaning to do a video on this showing where it cuts off on my wife's car but haven't had the time.

maybe this is the push I need. I know that we give margin or buffer zones but that is to keep warranty and yourself intact. you may want to rethink the manual switch if you plan to do that because if you forget to turn it back on, it may damage all sorts of goodies.
__________________

__________________
Be the change you wish to see in the world
--Mahatma Gandhi



GasSavers_BEEF is offline   Reply With Quote
Old 10-08-2009, 12:43 PM   #13
Registered Member
 
Dr. Jerryrigger's Avatar
 
Join Date: Sep 2009
Posts: 196
Country: United States
A scangauge sounds like a excellent toy, which I hope to soon own. Do they make one that can plug into a laptop to make graphs and show derivatives and integrals of said graphs, that just seems too cool to be in production...
Dr. Jerryrigger is offline   Reply With Quote
Old 10-08-2009, 12:54 PM   #14
Registered Member
 
GasSavers_BEEF's Avatar
 
Join Date: Apr 2008
Posts: 1,831
I think they make data loggers that will do that. sadly, the scangauge will not.

it hooks into your obd2 port and it will give you trip info like trip MPG that shows you average over a trip and the likes.

definitely check out their web site www.scangauge.com

also, some use a data logger ELM (something something) maybe you could do a search or shoot a PM to the user theholycow. he is also a moderator. I think he knows at least what I am talking about.
__________________
Be the change you wish to see in the world
--Mahatma Gandhi



GasSavers_BEEF is offline   Reply With Quote
Old 10-08-2009, 03:04 PM   #15
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Most modern fuel injected cars can DFCO, but each has different behavior.

The ScanGauge is a specific model of OBDII product and does not connect to a computer. There are plenty of other brands that do.

There's a link in my sig to a DIY fuel rate meter. That is the most accurate and fastest-responding way to detect DFCO. Using that, I've gotten a pretty accurate understanding of DFCO behavior in my VW and my GMC. My GMC usually has an 8 second delay before DFCO!
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 10-09-2009, 07:29 AM   #16
Registered Member
 
Join Date: Nov 2007
Posts: 1,460
Country: United States
Location: north east PA
Quote:
Originally Posted by mikemoss View Post
From my understanding if the motor stops spinning the transmission fluid pump the transmission will fry.
Depends. Autos that can be flat towed (like behind a RV) can be safely EOCed.

How can you spot DFCO with a scangauge? I've heard it wasn't possible.
trollbait is offline   Reply With Quote
Old 10-09-2009, 08:20 AM   #17
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Quote:
Originally Posted by trollbait View Post
How can you spot DFCO with a scangauge? I've heard it wasn't possible.
It's laggy and inaccurate, but it's useful enough. The quickest seems to be open/closed loop; when you see open loop you're in DFCO. You can also just watch instant MPG; when it goes to 9999 you're in DFCO, but it tends to take a few seconds of DFCO before it shows 9999.
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 10-09-2009, 10:37 AM   #18
Registered Member
 
Join Date: Nov 2007
Posts: 1,111
Country: United States
Send a message via AIM to dkjones96
Quote:
Originally Posted by mikemoss View Post
From my understanding if the motor stops spinning the transmission fluid pump the transmission will fry.
The engine will stay spinning under fuel cut unless either rpm falls to a point where there isn't enough hydraulic pressure to keep the transmission in gear or the transmission is shifted into neutral.

Also, you will get a check engine light with a cutoff switch unless you put a dummy load for each injector for the ecu to see.
__________________

__________________
- Kyle
dkjones96 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Criteria for getting and staying on the overall histogram Codyroo Fuelly Web Support and Community News 1 07-06-2012 05:58 AM
Anyone want to post their emissions? budomove General Maintenance and Repair 31 08-17-2007 05:33 PM
Regenerative braking??? 80cvcc General Fuel Topics 5 07-19-2007 11:06 AM
Team Challenge Results: What did you learn about FE? DRW General Fuel Topics 62 06-10-2007 08:59 PM
CVT for Bikes Snax People Powered 2 04-21-2007 05:01 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 08:59 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.