Correct Fuel |Injector size?
29 August 2009, 09:08 AM
#1
Correct Fuel |Injector size?
I'm looking at uprating my 550 injectors on my JDM Spec C in prep for bigger turbo. Will be looking at getting 400+bhp. Question is,,,, is there an optimum size to go for and can you go too big? for instance i know that say 650cc would be fine, but would 800cc be ok
, or do problems arise by going too big?
Cheers
Andrew
, or do problems arise by going too big?Cheers
Andrew
29 August 2009, 09:32 AM
#2
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spray pattern probs can occur if you go mad though
29 August 2009, 03:08 PM
#7
thankyou. So could i get away with 800cc injectors whilst running say,, 430bhp on a 2 litre STI?
and, to answer the above questions, why i would want bigger than needed: as Dunx as said - for future setup purposes, and because i maybe able to get a set of 800's fairly cheap.
and, to answer the above questions, why i would want bigger than needed: as Dunx as said - for future setup purposes, and because i maybe able to get a set of 800's fairly cheap.
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30 August 2009, 11:19 PM
#8
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800cc will give you ~80% IDC at 430bhp which is the ideal - depending on your turbo, fuel pump, FPR etc... If you're ever going to go over that bhp then get 900s and be done with it!
30 August 2009, 11:36 PM
#9
Yeah, a good rule of thumb for 'future proofing' (up to a point) is to get injectors that are c.200cc more than the minimum you actually need (this amount of 'jump' won't cause running probs).
So because 650cc will see you to 400+bhp, then 740/800cc (or even 900's) will be fine.
Then that way, you've got all that extra lovely headroom available for X-more mapped bhp (on another turbo, should it be necessary), etc..
So because 650cc will see you to 400+bhp, then 740/800cc (or even 900's) will be fine.
Then that way, you've got all that extra lovely headroom available for X-more mapped bhp (on another turbo, should it be necessary), etc..
Last edited by joz8968; 30 August 2009 at 11:44 PM.
31 August 2009, 09:42 AM
#11
Yeah, a good rule of thumb for 'future proofing' (up to a point) is to get injectors that are c.200cc more than the minimum you actually need (this amount of 'jump' won't cause running probs).
So because 650cc will see you to 400+bhp, then 740/800cc (or even 900's) will be fine.
Then that way, you've got all that extra lovely headroom available for X-more mapped bhp (on another turbo, should it be necessary), etc..
So because 650cc will see you to 400+bhp, then 740/800cc (or even 900's) will be fine.
Then that way, you've got all that extra lovely headroom available for X-more mapped bhp (on another turbo, should it be necessary), etc..
Cheers everyone.
31 August 2009, 11:51 AM
#12
Just to be totally clear...
Fitting bigger injectors should only be done if you are going to defo scale/map them properly... Or otherwise it will run like a bag of crap (if at all!)/invariably won't be safe for the engine/waste fuel, etc...
Fitting bigger injectors should only be done if you are going to defo scale/map them properly... Or otherwise it will run like a bag of crap (if at all!)/invariably won't be safe for the engine/waste fuel, etc...
Last edited by joz8968; 31 August 2009 at 11:53 AM.
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