Injector Size v Fuel Map ms

Give input on tuning as well as any tips and tricks you may have. Also feel free to share base mapping files for various engine types.
rxboxster
Posts: 42
Joined: Tue Nov 17, 2015 3:17 am
ECU Model: S80 Pro

Injector Size v Fuel Map ms

Post by rxboxster »

Hi guys and girls.

My injectors are on the limit, so I'm going to put some larger ones in.

So, regarding the fuel map, say the injectors are 20% larger, do I just knock 20% off the ms to get it roughly there?

Cheers
stevieturbo
Posts: 3577
Joined: Tue Aug 02, 2011 12:08 pm
ECU Model: No ECU
Location: Norn Iron

Re: Injector Size v Fuel Map ms

Post by stevieturbo »

Yep.
rxboxster
Posts: 42
Joined: Tue Nov 17, 2015 3:17 am
ECU Model: S80 Pro

Re: Injector Size v Fuel Map ms

Post by rxboxster »

Cheers buddy
rxboxster
Posts: 42
Joined: Tue Nov 17, 2015 3:17 am
ECU Model: S80 Pro

Re: Injector Size v Fuel Map ms

Post by rxboxster »

So if my old injectors are 349cc and the new ones are 511cc, do I use the percentage increase or decrease? Doh
stevieturbo
Posts: 3577
Joined: Tue Aug 02, 2011 12:08 pm
ECU Model: No ECU
Location: Norn Iron

Re: Injector Size v Fuel Map ms

Post by stevieturbo »

Obviously you need to decrease the numbers in the fuel table.
katana
Posts: 455
Joined: Sun Jan 27, 2013 6:08 pm
ECU Model: S60 Pro
Firmware Version: 29

Re: Injector Size v Fuel Map ms

Post by katana »

Decrease by 46%
rxboxster
Posts: 42
Joined: Tue Nov 17, 2015 3:17 am
ECU Model: S80 Pro

Re: Injector Size v Fuel Map ms

Post by rxboxster »

yeah I know i need to decrease the ms, but I was asking if I used the increase or decrease percentage figure, as they are different :) lol

Katana, thanks for the reply :)
rxboxster
Posts: 42
Joined: Tue Nov 17, 2015 3:17 am
ECU Model: S80 Pro

Re: Injector Size v Fuel Map ms

Post by rxboxster »

as 349 to 511 is 46%

But 511 to 349 is 31% :)
stevieturbo
Posts: 3577
Joined: Tue Aug 02, 2011 12:08 pm
ECU Model: No ECU
Location: Norn Iron

Re: Injector Size v Fuel Map ms

Post by stevieturbo »

Try them and see which gives you the end number you want ! Best way to learn.

Nothing is permanent until you decide to make it permanent...and even then it still isnt permanent lol
rxboxster
Posts: 42
Joined: Tue Nov 17, 2015 3:17 am
ECU Model: S80 Pro

Re: Injector Size v Fuel Map ms

Post by rxboxster »

lol, thats a good way to look at it dude :) ha ha

I'm crap at percentages, apart from VAT :) ha ha
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