Dev Blog
Forum
Wiki
About
NefMoto
>
Technical
>
Tuning
>
injectors scaling
Pages: [
1
]
« previous
next »
Author
Topic: injectors scaling (Read 5347 times)
Vdub-dub
Full Member
Karma: +4/-1
Offline
Posts: 136
injectors scaling
« on: April 11, 2012, 01:20:55 AM »
need a bit of help as i'm little unsure what needs to be changed to rescale injectors i'm increasing fuel presure to 4bar from 3bar with 383cc injectors taking them to 443cc , BAM engine
Logged
littco
Hero Member
Karma: +52/-7
Offline
Posts: 903
Re: injectors scaling
« Reply #1 on: April 11, 2012, 03:59:42 AM »
Hi
You'll need to adjust KRKTE
I know from my BAM stock injecotrs are as you say 383cc and Audi set KRKTE at 0.08347 pretty much for all 383cc injector cars that I've seen. I also know my car now running 550cc injectors runs well with the KRKTE at 0.07248 so I would say for you to run the car you'd need a figure in between there. The best way I found is to start with a figure, run the car, log 032 and then adjust the figure depending on result ie +/-.
It just so happens that 383+550/2 is nearly 443cc so a good ball park figure for you would be to set KRKTE at 0.08347+0.07248/2 = 0.077975
Now if you take the KRKTE ballpark figure equation of 34.125/injector cc/min
you get 34.125/443 = 0.07708 which is nearly the same
with this in mind i'd start with something in the middle say 0.07745 and run the car and log 032 and see what you. you may get it spot on or it might need a tweak but either way you'll be very close and the car will certainly run ok.
Logged
Vdub-dub
Full Member
Karma: +4/-1
Offline
Posts: 136
Re: injectors scaling
« Reply #2 on: April 11, 2012, 10:32:32 AM »
Thanks for your reply
Would I also be right in thinking TEMIN will need to be adjust same ?
Logged
littco
Hero Member
Karma: +52/-7
Offline
Posts: 903
Re: injectors scaling
« Reply #3 on: April 11, 2012, 11:06:13 AM »
I think you only need to adjust TEMIN if you have issues with the idle lfts. I also thought that it needed to be changed if you changed the injectors and the latency was different. If you run the same injectors the minimum opening time will be the same, I could be wrong though,
Best to try, log 032 on vcds and see what the trims are like.
Logged
Vdub-dub
Full Member
Karma: +4/-1
Offline
Posts: 136
Re: injectors scaling
« Reply #4 on: April 11, 2012, 01:38:08 PM »
basically mainly use logs to adjust acordinally best options
strange oem value being 0.08347 (which is same on my file) thats calulates to 410cc (34.125/410 = 0.08323) which has thrown me abit or im i on the wrong track?
Logged
littco
Hero Member
Karma: +52/-7
Offline
Posts: 903
Re: injectors scaling
« Reply #5 on: April 11, 2012, 03:22:15 PM »
The 34.125/cc is just a ball park guess, nothing accurate but gets you going. There is another formula which works it more accurately and if you search krkte in nef you'll find a couple of threads re it. I've got it written down but from experience while it's good it's never accurate because different engines run differently if you get a rough figure you can then adjust and fine tune once you are able to log 032
Logged
Pages: [
1
]
Print
« previous
next »
Jump to:
Please select a destination:
-----------------------------
General
-----------------------------
=> Introductions
=> General Discussion
-----------------------------
Noob Zone
-----------------------------
=> Noob Questions
=> Noob Guides and FAQs
-----------------------------
Technical
-----------------------------
=> NefMoto Software
=> Tuning
===> Documents & Helpers & How To's
===> Community Projects
=> Diagnostics
=> Flashing and Chipping
=> Cluster and Immobilizer
===> ECU EEPROM images
===> Original Cluster dumps
===> Original Cluster dump requests
=> Data Logging
=> Reverse Engineering
=> Communication Protocols
-----------------------------
ECU Files
-----------------------------
=> ECU Definition Files
===> ECU Definition File Requests
=> Original ECU Files
===> Original ECU File Requests
=> Checksum Update Requests
-----------------------------
Vehicles
-----------------------------
=> Vehicle Tech
=> Project Cars
-----------------------------
Regional
-----------------------------
=> Canadian Regional Discussion
=> US Regional Discussion
-----------------------------
Classifieds
-----------------------------
=> For Sale
=> Wanted
=> Services
-----------------------------
Miscellaneous
-----------------------------
=> Off Topic
=> Forum Tech Support
=> Bizarro Messages Posted by Bots and Spammers
Navigation
Home
Help
Login
Register
Personal Tools
September 19, 2024, 02:46:40 AM
Welcome,
Guest
. Please
login
or
register
.
Did you miss your
activation email?
1 Hour
1 Day
1 Week
1 Month
Forever
Login with username, password and session length
Search
Advanced Search
Loading...