www.gt4dc.co.uk
Maintain, Modify and DRIVE your GT-Four


It is currently Thu Mar 28, 2024 7:32 pm




Post new topic Reply to topic  [ 4 posts ] 
Author Message
 Post subject: Injector deadtimes.
PostPosted: Fri Dec 02, 2011 7:50 pm 
Offline
Group B
User avatar

Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3679
Location: Bournemouth
Car Model: None
Just been doing some work with Daryl on my unstable idle, and have discovered the root cause is the injector deadtime table on the link is way way out. As the revs drop, the voltage from the alternator drops which was then richening the mixture too much.

A bit of googling reveals the following useful info:


http://injector-rehab.com/shop/lag.html

_________________
If at first you don't suck seed, try drier grain.

Image


Top
 Profile  
 
 Post subject:
PostPosted: Sat Dec 03, 2011 7:42 pm 
Offline
Club Staff
User avatar

Joined: Wed Jul 13, 2005 5:10 pm
Posts: 1953
Location: Sunny Fareham, UK
Car Model: ST205
There should be a battery vs injector correction table in the ECU.

As the battery voltage drops then the injectors get lazy and need a bit more of a kick to get them to correctly open up.

This correction table is useful to help get the car started and keep it running when there is additional electrical load applied e.g. rear screen heater, blower etc etc

_________________
Kris
95 ST205 - slept for 10 years, now waking up...
Avensis
http://www.gtfours.co.uk
_______________________________________
Turbocharging - the replacement for displacement


Top
 Profile  
 
 Post subject:
PostPosted: Sat Dec 03, 2011 8:41 pm 
Offline
Club Staff
User avatar

Joined: Thu Jul 14, 2005 12:44 pm
Posts: 4067
Location: drinking devil fuel
Car Model: ST205
sounds like the dead time compensation must be set way too high somewhere

googlemsays pc link has an injector dead time compenstion table if you can find it


Top
 Profile  
 
 Post subject:
PostPosted: Sun Dec 04, 2011 12:43 am 
Offline
Group B
User avatar

Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3679
Location: Bournemouth
Car Model: None
It was set to 1mS at 14V and 1.1mS at 13V. The injectors are only needing about 1.1-1.2mS at idle (sard 800's running 2 pulses per engine cycle)

_________________
If at first you don't suck seed, try drier grain.

Image


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 


Who is online

Users browsing this forum: No registered users and 20 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group