Fuel injector size and fuel pressure

[Alexdaredevilz]

Im going to be ordering a set of injectors soon,

And going on the calculators I seen and done on-line, im going to need about 30lb, going on standard pressure of 38 psi is that right?

Engine will be 4.6 high compression, solid lifters/cam aiming for at least 6500rpm and 330-350 bhp

Comments welcome please

Edited by Alexdaredevilz on Thursday 11th August 16:17

[SILICONEKID340HP]

I have standard but cleaned Lucas green band injectors 22lb set at only 34psi, my 5l is producing 339.5bhp..

The weird thing is when the tuner upped the pressure it actually produced less bhp on the rollers...34psi with the vac removed gave the most power..

Im still looking at getting larger 30lb injectors when i find out if the injectors can`t cope with the flow ...

im obviously getting droplets rather than mist..I think the standard injectors should be set at 36psi..but i may be a different story with larger injectors..

[v8 racing]

30ib ones should be more than enough for that power, i use the ford motorsport red injectors that are 30ib and they will fuel 400bhp easily, £300 a set mind you!

[SILICONEKID340HP]

Are my injectors at there absolute limit? could there be a danger to the engine.what would i get from the larger injectors..more power better mpg etc.

[v8 racing]

Hi Daz, your injectors are close to there limit, for me the fear of running your injectors to the limit is them overheating, obviously they are flowing fuel so if one faulty and overheated to much you could be in danger of a fire under the bonnet.

[Alexdaredevilz]

SILICONEKID340HP said:

Are my injectors at there absolute limit? could there be a danger to the engine.what would i get from the larger injectors..more power better mpg etc.

Yes your whole engine will blow up unless you join me and haircutmike with a small group buy and save money on postage from buying a set from the states

[SILICONEKID340HP]

I never get a straight answer ! what are we buying from the states ?Ive been told those bosch injectors don`t fit the rail..What are we buying ..?hope there not cheap after market rubbish..

[SILICONEKID340HP]

v8 racing said:

Hi Daz, your injectors are close to there limit, for me the fear of running your injectors to the limit is them overheating, obviously they are flowing fuel so if one faulty and overheated to much you could be in danger of a fire under the bonnet.

YOUR WINDING ME UP !

[Alexdaredevilz]

SILICONEKID340HP said:

I never get a straight answer ! what are we buying from the states ?Ive been told those bosch injectors don`t fit the rail..What are we buying ..?hope there not cheap after market rubbish..

I don't know how good they are, ive never used them

There's a few to choose from, reason im buying from the states is there half the price

Even a garden hose would maker a better injector than the standard disc valve lucas ones

LOOK!

[CHGRIFF]

Best garden spray i've seen, where can I buy one?

[Jammy Dodger]

CHGRIFF said:

Best garden spray i've seen, where can I buy one?

+1 !

[haircutmike]

Jammy Dodger said:

+1 !

+2

[dbv8]

I am in for the group buy. Gardens looking a bit dry

[haircutmike]

Looks like the perfect spray pattern for washing wheels.

[Chilliman]

Where you lot by any chance in 'One flew over the cuckoo's nest' ?

[haircutmike]

Chilliman said:

Where you lot by any chance in 'One flew over the cuckoo's nest' ?

Yeh, I was the Indian and I'm still running!

[Jammy Dodger]

haircutmike said:

Yeh, I was the Indian and I'm still running!

I was Nurse Ratched

[dbv8]

I like turtles

[daxtojeiro]

SILICONEKID340HP said:

I never get a straight answer ! what are we buying from the states ?Ive been told those bosch injectors don`t fit the rail..What are we buying ..?hope there not cheap after market rubbish..

Darren,
if you send me that datalog you've been promising me for the past month I will soon tell you what your injectors are doing
Phil

[Alexdaredevilz]

Chilliman said:

Where you lot by any chance in 'One flew over the cuckoo's nest' ?

I had to google/YouTube that, it was made way before I was born! No wonder I have no idea what you lot are barking on about some times :-)