Now I have read conflicting reports on this so I need a definative answer.
I am going to put a vf28 with gems on my my97 with an uprated fuel pump and an FSE type jobby.
Can my standard injectors what ever size they are cope with say 320 bhp????

God do I need to know if I need to grovel to the missus for more money

 

You are not going to get an exact answer unless you can say what BSFC you are going to run. You can run an extra bar of fuel pressure so that you will get full capacity flow at a safe 85% duty cycle if you run an uprated pump/reg. If you use 5.5 cc/BHP then you can work on 380*4/5.5 = 276 BHP max.

This seems low, so the traditional BSFC is either a bit high for our cars or we all talk BS rolling road figures

In short, change them and forget trying to get definitive one dimensional answers to such questions as things are not that simple.

Put it this way, with sensible AFRs, the injectors are usually on the edge on a mapped P1 at standard pressure and they are 440s.

[Edited by john banks - 5/27/2003 5:45:35 PM]

 

So 550's would be the safest way forward?
Sounds expensive!!!

 

440s will probably be cheaper because people may sell them when upgrading to 550s. However, it is further complicated because you have Phase I fuel rails. It would just be a shame to limit your top end power because you ran out of injector.

[Edited by john banks - 5/27/2003 7:58:28 PM]

 

So what sort of money am I going to tell the missus I need.
Man this is getting expensive....!!!

[Edited by Nick200 - 5/27/2003 8:36:42 PM]

 

Nick.... need not be that expensive. A set of phase two 440 injectors can be had for about £100. Less if your lucky . You'll then need a little adaptor to make them suit phase 1 rails. Paul (Pavlo) is currently looking into having some of these made if there's enough interest. Drop him an e-mail.

Tony.

 

indeed

 

Tony- that makes you very lucky then

 

What power can safely ran with 440's?

 

280-300Hp I would say, would allow some head room

[Edited by submannz - 5/29/2003 3:34:21 AM]

 

Jonny... how would you know that .

Power wise i'd say a little more than 280 to 300bhp. The STi's came with 440s and 280bhp.... i think Subaru would have put a very big safety margin in there. I'd say 320bhp is more like the ceiling.... You have a pump and reg, is this adjustable. If so you could up the fuel pressure by 1 bar, this would potentially give you more flow (15%) and could see 350bhp..... ish.

Tony.

 

Using the std formula:

Std FP: 440 * 4 / 5.5 = 320 @ 100%IDC, 272 @ 85%IDC

+25% FP: 440 * 4 * 1.15 / 5.5 = 368 @ 100%IDC, 312 @ 85% IDC

Andrew...

 

I want 300-350 sort of area.
I might try to find some 550's, you never know your luck!

P.s sod spending all this money and eduring all the moaning to end up with just 280 bhp not going to happen people.

 

Hi Nick

If you want i have a set of phase 1 injectores that i am going to be selling if intersted.

They are 480cc yellow top ( No they are not the 440 one's)

£300 if intersted.

Cheers Dougie

 

480's what are they off? was they standard??

 

Hi Nick

They are acctually of a Catalunya My 97.

New they were £560 Straight fit for the 97

Cheers Dougie

 

I'll have to have a chat to the missus as she wants me to fix my calipers first.
Cheers m8 I'll let you know.