KW's <---> What size Injectors ? - Perth-WRX.com

WRXTASY · #1 19-07-2007, 03:07 PM

Hi anyone got a calculation method for injector sizing for a certain number of KW ?

IE. Aiming for 230-240KW ATW on an EJ207.
Will 560 CC injectors be sufficient. No upgraded FPR but Walbro pump installed.

Got a feeling I need 650cc's to be safe.

Comments / formula's ?

J

Mister Two · #2 19-07-2007, 03:11 PM

560cc should do it with a bit of head room to spare. A few people are getting 200kw ATW in 440c at around 95% IDC. So an extra 120cc should be able to handle it okay.

Personally, though, I'd still go the 650cc for extra headroom and for future mods and greater power outputs.

BALISTC · #3 19-07-2007, 03:13 PM

http://www.rceng.com/technical.htm

BXT · #4 19-07-2007, 03:13 PM

What Dyno are we talking here DD ot Hub?

foxey · #5 19-07-2007, 03:14 PM

J

Sorry to go off topic, but are you aiming to do this the the VF36? I'm running a VF37 and would like similar power, but not sure if it's possible with this size turbo. In saying that though, the turbo seems like it could happily produce 1.8-2 bar so.....

Mister Two · #6 19-07-2007, 03:24 PM

Also, at those kinds of power outputs or more you should consider getting parallel fuel rails and a good quality FPR.

pmh · #7 19-07-2007, 03:25 PM

You dont need to touch the fuel rails or FPR. you can just mod the existing factory set up.
Having an aftermarket FPR just adds another potential problem when it fails

http://www.perth-wrx.com/vb/showthre...highlight=fuel

BALISTC · #8 19-07-2007, 03:25 PM

Quote:

Originally Posted by Mister Two

Also, at those kinds of power outputs or more you should consider getting parallel fuel rails and a good quality FPR.

*sigh*

tuna · #9 19-07-2007, 03:29 PM

Quote:

Originally Posted by Mister Two

Also, at those kinds of power outputs or more you should consider getting parallel fuel rails and a good quality FPR.

only if you subscribe to hot4's and are gullible.

tuna · #10 19-07-2007, 03:36 PM

jamie,
with stock fpr, walbro pump and standard injectors (cut-top's) you have about 816cc of fuel injector at your disposal. the standard fuel lines @ 40psi are also capable of delievering over 18litres per minute, so your current fuel system is fine (no need to modify it and you will have no problems with what youve got)