Microtech Area is for discussing Microtech systems

Microtech staged injection misfire/small hesitation

Thread Tools
 
Search this Thread
 
Old Jul 27, 2010 | 08:21 PM
  #1  
arc_55's Avatar
Thread Starter
Junior Member
Tenured Member 05 Years
 
Joined: Dec 2005
Posts: 29
Likes: 1
From: Toronto
staged injection misfire/small hesitation

hey guys, I have tuned this t2 engine very well but i am curious to know how i can fix my staged injection hesitation. I have it set for 3000rpm and i have a slight misfire/hesitaiton type feeling exactly at 3000 rpm. What screen can help me fix this issue. Should i raise the rpm point?

Thank you
Reply
Old Jul 28, 2010 | 09:05 AM
  #2  
Aaron Cake's Avatar
Engine, Not Motor
Tenured Member: 20 Years
iTrader: (1)
 
Joined: Feb 2001
Posts: 29,798
Likes: 128
From: London, Ontario, Canada
So what are your injector sizes?
Reply
Old Jul 28, 2010 | 09:12 PM
  #3  
PDF's Avatar
PDF
Full Member
Tenured Member 20 Years
 
Joined: Nov 2003
Posts: 192
Likes: 8
From: .
Try lowering the stage rpm point 200rpm or so at a time until it gets better.
Reply
Old Jul 29, 2010 | 06:06 AM
  #4  
arc_55's Avatar
Thread Starter
Junior Member
Tenured Member 05 Years
 
Joined: Dec 2005
Posts: 29
Likes: 1
From: Toronto
1000cc all around , not needed i know. I will try lowering the rpm point and see if i can get it to go away. I will keep this post updated!

thank you
Reply
Old Jul 30, 2010 | 02:19 AM
  #5  
rx72c's Avatar
Rotary Freak
Tenured Member: 20 Years
Top Answer: 1
iTrader: (8)
 
Joined: Jun 2003
Posts: 2,878
Likes: 195
From: Australia
bring it down to 2500rpm and work on seeing if its a lean or rich misfire
Reply
Old Jul 31, 2010 | 10:23 AM
  #6  
Aaron Cake's Avatar
Engine, Not Motor
Tenured Member: 20 Years
iTrader: (1)
 
Joined: Feb 2001
Posts: 29,798
Likes: 128
From: London, Ontario, Canada
Seems to me that with 4 injectors of equal size, %Stage should be 50%.
Reply
Old Jul 31, 2010 | 12:03 PM
  #7  
arc_55's Avatar
Thread Starter
Junior Member
Tenured Member 05 Years
 
Joined: Dec 2005
Posts: 29
Likes: 1
From: Toronto
Yes the stage percentage is at 50%. I havent had an oppertunity to work with the stage rpm but i will very soon and keep you updated on the results.

thanks guys
Reply
Old Aug 1, 2010 | 09:22 PM
  #8  
bumpstart's Avatar
talking head
Tenured Member 05 Years
 
Joined: Apr 2008
Posts: 2,775
Likes: 15
From: Perth, WA, OZ
leave stage at 50%
bring down the stage threshold to 2500 rpm and see if its worse ( i expect it is as i anticipate its already a rich crossing )

[ you err rich to prove the issue,, not lean ]

if it is worse you can move the stage threshold back to 3000 rpm and then try upping the other flag ( load ) which is factory set to -5 inch HG ( try 2 psi stage )
so that staging occurs at a higher engine load than before to use up the excess stage fuel

it may just be a matter of raising that load threshold,, or sometimes both that and the threshold RPM
( ie , 3500 and 2 psi stage requires much more fuel than the stumbling 3000 , -5 inch HG stage )
Reply
Old Jul 25, 2012 | 05:38 PM
  #9  
coreye1029's Avatar
tryingsomethingnew
 
Joined: Jan 2012
Posts: 4
Likes: 0
From: D.C. area
VA question to arc

i have the same size injectors and im having the same problem. i know its the staging but my car is untuned, and nobody around here tunes micro. since yours is tuned, i was wondering if i could use your numbers to tune mine.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
dona1326cosprings7
1st Generation Specific (1979-1985)
4
Oct 29, 2015 06:47 AM
LongDuck
1st Generation Specific (1979-1985)
12
Oct 7, 2015 08:12 PM
spokanerxdude
Megasquirt Forum
3
Oct 6, 2015 12:28 PM
lnlreaper
2nd Generation Specific (1986-1992)
2
Sep 27, 2015 09:59 AM




All times are GMT -5. The time now is 09:36 PM.