Notices

Dead time correction for 460cc

Thread Tools
 
Search this Thread
 
Old Jan 17, 2010 | 12:36 PM
  #1  
nismo502's Avatar
Thread Starter
Junior Member
iTrader: (2)
 
Joined: Sep 2009
Posts: 228
Total Cats: 2
From: singapore
Default Dead time correction for 460cc

I cannot seems to find specific information online. If you are using RX7 460cc injectors, can you share with me your dead time correction?
These are the injectors I am using
- 1989-1991 Mazda Rx-7 Fuel Injectors
Part# Denso 195500-2010
460cc High Impedance

Thanks.
Old Jan 17, 2010 | 09:08 PM
  #2  
timk's Avatar
Senior Member
 
Joined: Dec 2004
Posts: 1,278
Total Cats: 37
From: Brisbane, Australia
Default

I'm running those injectors using these deadtimes:



Not sure where I sourced them from but the car runs fine!
Old Jan 17, 2010 | 11:17 PM
  #3  
nismo502's Avatar
Thread Starter
Junior Member
iTrader: (2)
 
Joined: Sep 2009
Posts: 228
Total Cats: 2
From: singapore
Default

Thanks!
Does it matter if I am running 1.6 or 1.8?

Last edited by nismo502; Jan 17, 2010 at 11:18 PM. Reason: added info
Old Jan 18, 2010 | 12:56 AM
  #4  
18psi's Avatar
VladiTuned
iTrader: (76)
 
Joined: Apr 2008
Posts: 35,821
Total Cats: 3,482
Default

I'm pretty sure you got them from me. And I'm pretty sure I got them from y8s

Those settings work for my rx7 460's though
Old Jan 19, 2010 | 12:32 AM
  #5  
rweatherford's Avatar
Junior Member
 
Joined: Dec 2009
Posts: 332
Total Cats: 1
From: Shelbina, MO (North East)
Default

Sorry I'm a newb, but is that the same as minimum injector opening time?

My MSPNP has 1.2 ms set in it and I was curious why it wasn't the normal 1.0 ms, but that is for another thread.
Old Jan 19, 2010 | 05:17 AM
  #6  
Zaphod's Avatar
Elite Member
 
Joined: Mar 2006
Posts: 1,574
Total Cats: 106
From: Schwarzenberg, Germany
Default

I tested with the MS2 (switching between 2 and 4 squirts per cycle) and came to an deadtime of 1.185 ms. 460cc RX7 inj.
Old Jan 19, 2010 | 06:46 AM
  #7  
richyvrlimited's Avatar
Elite Member
iTrader: (1)
 
Joined: Jun 2006
Posts: 2,642
Total Cats: 42
From: Warrington/Birmingham
Default

Can someone explain to me the advantage of having a 100% accurate deadtime figure?!

Cheers!
Old Jan 19, 2010 | 11:49 AM
  #8  
CRAIGO's Avatar
Junior Member
 
Joined: Oct 2008
Posts: 272
Total Cats: 0
From: Manchester, UK
Default

I'd like to know that too.
DIYPNP maps have 1.6 cars at 1.0ms and 1.8 cars at 1.2ms.

My map is set to 1.2ms on stock injectors. If I change it to 1.0ms I then need to add 20% to all of my VE table so what's the point of dead time being accurate?
Old Jan 23, 2010 | 12:45 PM
  #9  
nismo502's Avatar
Thread Starter
Junior Member
iTrader: (2)
 
Joined: Sep 2009
Posts: 228
Total Cats: 2
From: singapore
Default

Originally Posted by richyvrlimited
Can someone explain to me the advantage of having a 100% accurate deadtime figure?!

Cheers!
Quoted this from another forum:
"if you have a latency at say 14V of 0.6ms and a trim is applying say 12% more or less, to the map number, which will give more than +-12% actual fuel as the latency in is there as well(so with latency compensation your trimming is effectively finer and more accurate), the difference in AFR change between high and low opening times of that change will also be different without lags compensated in the ecu (as the lag makes up a greater or lesser portion of the time in the map), but should be very consistent with reasonably accurate lag in the software."

Having said that, the last time when my alternator belt broke, I was running about 10.2v and it lean out big time.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
bigmackloud
Miata parts for sale/trade
19
Jan 8, 2021 11:24 AM
Zaphod
MEGAsquirt
47
Oct 26, 2018 11:00 PM
Frank_and_Beans
Supercharger Discussion
13
Sep 12, 2016 08:17 PM
shooterschmidty
Engine Performance
8
Sep 30, 2015 10:28 PM




All times are GMT -4. The time now is 02:08 AM.