Starting problems after injector scaling
#1
Starting problems after injector scaling
I recently put on pte 780cc injectors. I scaled down the Cranking Enrichment IPW by .737 (513/696). But still the car doesn't always want to start right away. It just cranks and I stop, cranks again and maybe starts after 6-10 cranks if not more.
Is there anything else I should change?
Thanks
Is there anything else I should change?
Thanks
#5
Evolved Member
iTrader: (2)
Is your problem cold starts, warm starts, or hot starts? Are you getting too much fuel or too little? An easy way to check is to hold the throttle half way open and crank again. If the car starts easier, then you're getting too much fuel.
It sounds like you are using the right tables, and if so, keep adjusting the temp range in which you are having the issue and add or take away fuel depending on what your issue is.
Seeing that 780s are pretty close to stock, it may simply need a latency adjustment. But you should be adjusting the other injector tables that do not scale with bigger injectors as you are doing. Many don't because they don't experience problems and/or cover it with latency and scaling, but the other injector tables do in fact need to be scaled based on the new injector size...otherwise you will be injecting that much more fuel.
It sounds like you are using the right tables, and if so, keep adjusting the temp range in which you are having the issue and add or take away fuel depending on what your issue is.
Seeing that 780s are pretty close to stock, it may simply need a latency adjustment. But you should be adjusting the other injector tables that do not scale with bigger injectors as you are doing. Many don't because they don't experience problems and/or cover it with latency and scaling, but the other injector tables do in fact need to be scaled based on the new injector size...otherwise you will be injecting that much more fuel.
Last edited by l2r99gst; Mar 10, 2010 at 06:51 AM.
#6
Evolved Member
iTrader: (22)
Join Date: Nov 2003
Location: Northern KY near Cincy
Posts: 2,408
Likes: 0
Received 6 Likes
on
6 Posts
The Start IPW Latency mcsec table is not entered with a " . " Just enter the value you have in your 14.06v latency.
Example.....
My 14.06 value is 0.792. So for the Start IPW table I put = 792. Notice there isn't a need for the decimal point.
Example.....
My 14.06 value is 0.792. So for the Start IPW table I put = 792. Notice there isn't a need for the decimal point.
Trending Topics
#9
Is your problem cold starts, warm starts, or hot starts? Are you getting too much fuel or too little? An easy way to check is to hold the throttle half way open and crank again. If the car starts easier, then you're getting too much fuel.
It sounds like you are using the right tables, and if so, keep adjusting the temp range in which you are having the issue and add or take away fuel depending on what your issue is.
Seeing that 780s are pretty close to stock, it may simply need a latency adjustment. But you should be adjusting the other injector tables that do not scale with bigger injectors as you are doing. Many don't because they don't experience problems and/or cover it with latency and scaling, but the other injector tables do in fact need to be scaled based on the new injector size...otherwise you will be injecting that much more fuel.
It sounds like you are using the right tables, and if so, keep adjusting the temp range in which you are having the issue and add or take away fuel depending on what your issue is.
Seeing that 780s are pretty close to stock, it may simply need a latency adjustment. But you should be adjusting the other injector tables that do not scale with bigger injectors as you are doing. Many don't because they don't experience problems and/or cover it with latency and scaling, but the other injector tables do in fact need to be scaled based on the new injector size...otherwise you will be injecting that much more fuel.
Last edited by xmaciek82x; Mar 10, 2010 at 07:58 AM.
#10
Evolved Member
iTrader: (22)
Join Date: Nov 2003
Location: Northern KY near Cincy
Posts: 2,408
Likes: 0
Received 6 Likes
on
6 Posts
See post #7 above.....he did what I am talking about. But he changed the scalings so they match. Currently all you need to do is was I said....make the value at the 14.06v level be input into the Start IPW table but without a decimal point.
#12
Evolved Member
iTrader: (22)
Join Date: Nov 2003
Location: Northern KY near Cincy
Posts: 2,408
Likes: 0
Received 6 Likes
on
6 Posts
HMMMM I don't seem to have it in my 8859 xml either. I havn't tuned any 9s with bigger injectors yet so I never desired to look at this.
Maybe it is time for the Gurus to step in and fine this little gem for the IX guys.
Maybe it is time for the Gurus to step in and fine this little gem for the IX guys.
#13
Evolved Member
iTrader: (26)
Join Date: Oct 2005
Location: Pittsburgh
Posts: 1,712
Likes: 0
Received 0 Likes
on
0 Posts
There are a few additional start-up tables as well - you need to see the advanced fuel thread by mrfred.
IMO - u probably can fix it by adjust that 1st pulse table u already have.
new IPW start values = stock scaling/new scaling * stock IPW value (from that table)
Last edited by travman; Mar 10, 2010 at 08:38 AM.
#15
Evolved Member
iTrader: (2)
Also, just as an fyi, that 'start IPW msec' table that a few people are mentioning...mrfred has stated in the past that table isn't even called in the Evo8 and Evo9 roms.
I think sticking with the table that you are using will ultimately resolve the issue. I would recommend reading through and using all the defs for the tables that mrfred posted in the 'advanced fuel control' thread.
I think sticking with the table that you are using will ultimately resolve the issue. I would recommend reading through and using all the defs for the tables that mrfred posted in the 'advanced fuel control' thread.