Engine Management eCtune , Crome , AFC , FMU , Zdyne , Hondata , EMS , TE , Uberdata Anything to control your fuel, spark needs!

Injector drivers.... Home made :)

Old 01-04-2010, 01:04 PM
  #1  
0.5 BAR
Thread Starter
 
#Rotor's Avatar
 
Join Date: Jun 2006
Posts: 189
Default Injector drivers.... Home made :)

just something a bit more high tech than a resistor-box....


The graph, clearly demonstrating the peak&hold method of engaging the injector


I'm very pleased with how this little project is turning out... will be installing on the car soon, to see if it performs as advertized.
#Rotor is offline  
Old 01-05-2010, 06:09 PM
  #2  
0.0 BAR
 
Join Date: Jan 2010
Posts: 5
Default

nice, care to share the circuit diagram?
Mosaic is offline  
Old 01-06-2010, 10:51 AM
  #3  
0.5 BAR
Thread Starter
 
#Rotor's Avatar
 
Join Date: Jun 2006
Posts: 189
Default

I'm using the one in the spec sheet for the lm1949, with a couple of additions, just adding voltage regulation to give the chip a steady 5v to run from. I also fiddled a bit with the cap values, to get the graph nice and the spike a bit higher than it was with the values in the spec-sheet... this is very dependant on the injectors though, so I would recommend fine-tuning with the ones you plan on running....
#Rotor is offline  
Old 01-06-2010, 09:42 PM
  #4  
0.5 BAR
 
Join Date: Nov 2009
Posts: 50
Default

what does this do?
tecks is offline  
Old 01-09-2010, 01:36 PM
  #5  
0.5 BAR
Thread Starter
 
#Rotor's Avatar
 
Join Date: Jun 2006
Posts: 189
Default

Just installed it and the injectors today.... and to my utter surprise, the car started up first crank, not withstanding the fact that it's a rather major alteration..... some quick mapping to get the AFR's back into shape, did a couple of runs and in less than half an hour we had fuel capacity for way over 1.5bars boost.


ECU running much cooler than without the driver, and even the driver itself does not get very hot...


what this does, It spikes the injector with an initial burst of current, getting it to pull open very fast and very accurate.... once the injector is open, it does not need all that current to stay open, less than 25% of it, is usually way more than enough to keep it there.....

Problem with driving a Low impedance injector with it's full current, is that when the time comes for it to shut down, the magnetic field collapsing, generates considerable back-EMF, and that in effect, will try to keep it open, causing a very delayed and crappy shut-slope.

With the peak and hold method, the hold current being much lower, limits the back-EMF, and thus give the injector the ability to shut down much faster as well, so it's a win win win situation.... fast and strong open, fast close, and much easier on the ECU....
#Rotor is offline  
Old 01-09-2010, 11:31 PM
  #6  
1.0 BAR
 
Join Date: Feb 2003
Location: Wisconsin
Posts: 461
Default

VERY nice!!
josh19wrc is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
HMT-Roger
General Discussion
0
08-12-2011 06:19 AM
fuse
Engine Management
0
04-13-2009 07:31 PM
Xgenturbo
General Discussion
6
07-22-2006 12:44 PM
buk9tp
General Discussion
6
04-18-2006 03:57 AM
raprazant
Engine Management
1
05-30-2005 02:00 AM


Thread Tools
Search this Thread
Quick Reply: Injector drivers.... Home made :)


Contact Us - Sitemap - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.