Hi,
I cant get a definate answer on this and dont want to bugger things up so here goes.
I have fitted larger injectors to my rebuilt engine im running MS1 Extra.
Do I just have to change the req fuel for the new injector settings only??
Or do I have to go in and under one of the options saw something about old req fuel and new req fuel and this changes the VE tables.
I understand it will need final tuning but just want to get roughly somewhere so I can run a few miles in.
Many Thanks
Neal
New larger injectors
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: New larger injectors
You need to change Required Fuel, Cranking Pulse Width, and Acceleration Enrichment. Maybe Injector Opening Time too. The rest is unchanged.
Re: New larger injectors
I have also changed from 2.5 bar to 3.0 fuel pressure, is there a calculation to allow for this or will it still be in a good range to get it running in??
Engine is a rover v8 old injectors at 3 bar were 210cc / min but were running only 2.5 bar for my req fuel calculation.
My new injectors are 350cc / min at 3bar which I now have with a new fuel pressure regulator.
Engine is a rover v8 old injectors at 3 bar were 210cc / min but were running only 2.5 bar for my req fuel calculation.
My new injectors are 350cc / min at 3bar which I now have with a new fuel pressure regulator.
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DonTZ125
- Experienced Squirter
- Posts: 337
- Joined: Sat May 16, 2009 1:49 pm
- Location: Scarborough, ON
- Contact:
Re: New larger injectors
Flow increase through a fixed orifice is a function of the square root of increased differential pressure; Q2^2 ~ Q1^2 x (P2/P1)
You've increased your dP by (3/2.5) = 1.2; your flow will increase by a factor of 1.095.
This is theoretical math, real world factors in your piping will also contribute with minor flow losses.
You've increased your dP by (3/2.5) = 1.2; your flow will increase by a factor of 1.095.
This is theoretical math, real world factors in your piping will also contribute with minor flow losses.
