What fuel pressure should I run?

Reply Subscribe

Thread Tools

Search this Thread

Apr 24, 2009 | 09:48 AM

#11

Dark Halo

Thread Starter

TECH Fanatic

iTrader: (14)

Joined: Aug 2004

Posts: 1,505

Likes: 1

From: Texas

I am at 60 for now, but I may experiment. My tunner had also recomended running 58-60

Apr 24, 2009 | 02:22 PM

#12

dirt track racer 81

TECH Senior Member

iTrader: (45)

Joined: Jun 2005

Posts: 9,439

Likes: 13

From: Hennessey, Oklahoma

Quote:

Originally Posted by thunder550

If the injectors are designed for 3 bar I would run them there. I think the spray patterns get distorted when you turn the pressure up higher than designed, plus the lower pressure is easier on the pump.

ive always wondered if a higher pressure could make the spray pattern different..
alot of people run it like this tho..

Apr 24, 2009 | 06:30 PM

#13

Dark Halo

Thread Starter

TECH Fanatic

iTrader: (14)

Joined: Aug 2004

Posts: 1,505

Likes: 1

From: Texas

has any real testing been done on this?

Nov 26, 2009 | 08:01 PM

#14

JOHN1L40

On The Tree

Joined: Dec 2005

Posts: 103

Likes: 0

Is this, 60 psi, set with vacuum removed? So it would be 60 psi max under load and a few ponds less unloaded?

Nov 27, 2009 | 10:24 PM

#15

thunder550

High on diesel fumes

iTrader: (70)

Joined: Mar 2005

Posts: 12,658

Likes: 3

From: Phoenix, AZ

Yes, you would set the desired fuel pressure with the engine off, so there would be no vacuum on the FPR. Once the engine is running the manifold pressure will dictate the final fuel pressure.

Nov 30, 2009 | 08:46 AM

#16

BigKID

TECH Veteran

iTrader: (5)

Joined: Dec 2001

Posts: 4,947

Likes: 242

From: Panama City, Fl

Quote:

Originally Posted by Dark Halo

I am at 60 for now, but I may experiment. My tunner had also recomended running 58-60

You need to run at the fuel pressure your tunner recomends so that your injectors are scaled properly. With 42# injectors, there is no reason to deviate from the stock spec pressure.