Go Back   EcoModder Forum > EcoModding > Instrumentation > OpenGauge / MPGuino FE computer
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 05-28-2009, 02:44 AM   #61 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location:
Posts: 5,032

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 156
Thanked 264 Times in 207 Posts
I would like to try this at some point. Lemme know if anyone is in a position to try it (not sure if the zener helps anything or not, maybe just a reverse diode would be better so the signal current isn't divided between the diodes but reverse impulses get absorbed).


Attached Thumbnails
Click image for larger version

Name:	Untitled.gif
Views:	261
Size:	8.0 KB
ID:	3584  
__________________
WINDMILLS DO NOT WORK THAT WAY!!!

Last edited by dcb; 05-28-2009 at 09:09 AM..
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 05-28-2009, 04:24 PM   #62 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location:
Posts: 5,032

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 156
Thanked 264 Times in 207 Posts
Made a little progress, built the circuit (with reverse diode instead of zener) and tried it out on the bench. The standard guino would be showing about 0.53 gph but this is showing 0.77, so there may be some futzing yet as the opto may add delays and possibly innacuracies, but should be better than nothing.

There is an additional lead that should be connected to the plus side of the injector to eliminate variables.



Note: If I change inj delayUS to 1600 then it goes back to 0.53 gph, don't know if that is the correct course of action yet, just sayin.
Attached Thumbnails
Click image for larger version

Name:	Untitled.jpg
Views:	248
Size:	46.6 KB
ID:	3586  
__________________
WINDMILLS DO NOT WORK THAT WAY!!!

Last edited by dcb; 05-28-2009 at 04:35 PM..
  Reply With Quote
Old 05-28-2009, 05:00 PM   #63 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location:
Posts: 5,032

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 156
Thanked 264 Times in 207 Posts
Ok, It turns out I have a relative with a 93 s10 with a 4.3 tbi collecting dust in the garage. Hopefully that is a peak and hold too (sounds promising) I think I will have to arrange some in-person fidgeting...
__________________
WINDMILLS DO NOT WORK THAT WAY!!!
  Reply With Quote
Old 05-28-2009, 05:13 PM   #64 (permalink)
EcoModding Lurker
 
Join Date: Mar 2009
Location: Vancouver, WA
Posts: 48

Active Learning - '93 Chevy Suburban Silverado
90 day: 10.67 mpg (US)
Thanks: 0
Thanked 0 Times in 0 Posts
Everything I have ever read says that is a peak and hold injector. Should be very similar to what I have in the suburban. just smaller.
  Reply With Quote
Old 05-28-2009, 07:54 PM   #65 (permalink)
nut
 
Coyote X's Avatar
 
Join Date: Dec 2007
Location: Southen West Virginia
Posts: 654

Metro XFi - '93 Geo Metro XFi Convertible
90 day: 62.17 mpg (US)

DR650SE - '07 Suzuki DR650SE
90 day: 55.26 mpg (US)
Thanks: 0
Thanked 37 Times in 26 Posts
Send a message via MSN to Coyote X
the 93 S10 is peak and hold. Same exact setup as I have in my Astro
__________________


  Reply With Quote
Old 05-28-2009, 08:37 PM   #66 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location:
Posts: 5,032

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 156
Thanked 264 Times in 207 Posts
Ok thx guys, now I just have to get the beast running

I got a haynes from the library (I love my library), and it "looks" like inj+ is connected to +12, so this might just be doable as a 4 prong deal using the "normal" connections, on a gm anyway.
__________________
WINDMILLS DO NOT WORK THAT WAY!!!
  Reply With Quote
Old 05-28-2009, 09:13 PM   #67 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location:
Posts: 5,032

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 156
Thanked 264 Times in 207 Posts
Another data point

I hotwired inj+ to the 12volt lead and grabbed my guino splitter and a spare guino and plugged it all into the metro. When I changed injdelayUS on the guino attached to this gizmo to 1350 they were pretty much within 1% of each other on the gph display and turned over the hundreths place on a gallon at the same time.

Now it may be that peakers open quicker given their higher current, and that the number should come back down a bit too. Any stats on that?
__________________
WINDMILLS DO NOT WORK THAT WAY!!!
  Reply With Quote
Old 05-28-2009, 09:50 PM   #68 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location:
Posts: 5,032

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 156
Thanked 264 Times in 207 Posts
Ok, here is an updated circuit. If anyone is following and wants to try it, feel free (It might take me a while). I would say make injUS delay at least 1000, or if you are coyotex, just dial it in with that diagnostic port

This goes in line with the injector lead, and the connector already has 12v and ground, and you should already have a negative injector tap.

Here is the opto I'm using:
http://mouser.com/Search/ProductDeta...key859-LTV-815

The diode is a 1n4004
http://mouser.com/Search/ProductDeta...lkey821-1N4004

The resistors are 10k ohm and 470 ohm
Attached Thumbnails
Click image for larger version

Name:	Untitled.gif
Views:	490
Size:	8.0 KB
ID:	3589  
__________________
WINDMILLS DO NOT WORK THAT WAY!!!

Last edited by dcb; 05-28-2009 at 10:19 PM..
  Reply With Quote
Old 10-07-2009, 10:46 PM   #69 (permalink)
Master EcoModder
 
Join Date: Oct 2009
Location: Phoenix AZ
Posts: 547
Thanks: 4
Thanked 17 Times in 13 Posts
Have you seen the Peak and Hold injector adaptor by JayCar?? They sell a kit that works with their duty cycle reader kit.

RIch

Last edited by racprops; 10-09-2009 at 07:28 PM..
  Reply With Quote
Old 01-03-2010, 08:57 PM   #70 (permalink)
in tents
 
dennyt's Avatar
 
Join Date: Dec 2009
Location: Seattle, WA, USA
Posts: 158

The Adventure Wagon - '94 Subaru Loyale Wagon 4x4
Subaru
90 day: 33.43 mpg (US)

Electro-Monkey - '11 Surly Karate Monkey BMC V2S Front Hub Motor
90 day: 694.1 mpg (US)
Thanks: 31
Thanked 30 Times in 22 Posts
It looks like I'm facing this peak & hold challenge in my '94 Subaru Loyale SPFI. I get GPH readings that go up with engine RPM, but not throttle position - coasting vs. floored gives the same reading, only shifting changes the GPH.

Any recent developments, or should I dive in with this op amp circuit?

__________________
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pulse & Glide / EOC: Anyone rated their gallons per hour @ 0mph? dissimilation Hypermiling / EcoDriver's Ed 27 07-19-2010 03:12 AM
Slight error Johnny Mullet Forum News & Feedback 3 07-22-2008 04:05 PM
How Many Gallons Per Week? LostCause The Lounge 24 05-06-2008 10:02 AM
Tolls to limit rush hour driving? SVOboy General Efficiency Discussion 10 04-27-2008 04:12 AM
Fuel log error diamondlarry Forum News & Feedback 3 04-19-2008 03:38 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com