Evening all, I have 2 very stupid questions:

No. 1 how you cut braided fuel lines without running the braided bit?

No. 2 I trying to work out how to fit my fpr, now I know it goes return side but I can't work out which is the inlet port and which is the outlet port on the fpr, also there is small connection which looks like a connection for a vac line, any ideas what this for?

Cheers for any advice in advance Wigs

 

Oh yeah forgot to mention the fpr kit is one of Harvey Smiths

 

1. Put some electrical tape on the hose where you wanna cut. put it on real thight, then cut right thru the tape. You can leave the tape to put on the fitting.

 

Quality cheers for that just need an answer to no. 2 now

 

#2 - it's for, um, a vacuum hose!

The FPR needs a manifold pressure reference to make sure it maintains a constant fuel pressure both on and off boost.

 

I always thought the idea of an adjustable fpr was so you could set a constant fuel pressure. Or I'm just been retarded?

 

An adjustable FPR allows you to adjust the static fuel pressure up or down. So you can run 3.5 bar (say) rather than the stock 3 bar and so push more fuel through the injectors (assuming the pump is up to it, and will also need mapping for etc).

But it MUST have a vacuum connection otherwise the fuel pressure varies hugely with boost/vacuum. If you are on 1 bar boost, fuel pressure will *drop* by 1 bar as the boost pressure will literally force the fuel back up the injector.

The vacuum connection maintains a constant pressure regardless of boost - but the adjustable bit allows you to choose what the actual pressure is.

 

Brilliant cheers for that seems I was having a slight blonde moment! Mine will need to mapped and played with anyway as I'm fitting high flow billit fuel rails in parallel as well as putting bigger injectors in at the same time as well, cheers for answering my stupidity

 

 

YW