FUEL PRESSURE REGULATOR

Can be used on all 2002-2003 harley trucks and lightnings.
jgomez
Posts: 8
Joined: 2022 Jul 19, 16:05
Location: culiacan, sinaloa, mexico
Vehicle Information: 2003 ford lightning NLP2

FUEL PRESSURE REGULATOR

Unread post by jgomez »

HI

WHAT GASOLINE PRESSURE SHOULD THE MECHANICAL REGULATOR INDICATE WHEN IT IS ON? AT IDLE
decipha
Posts: 4955
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: FUEL PRESSURE REGULATOR

Unread post by decipha »

on a stock lightning/harley with stock fuel pressure regulator it should be around 32 psi at idle and should jump up to 40psi with the vac line removed.
jgomez
Posts: 8
Joined: 2022 Jul 19, 16:05
Location: culiacan, sinaloa, mexico
Vehicle Information: 2003 ford lightning NLP2

Re: FUEL PRESSURE REGULATOR

Unread post by jgomez »

decipha wrote: 2022 Aug 08, 14:54 on a stock lightning/harley with stock fuel pressure regulator it should be around 32 psi at idle and should jump up to 40psi with the vac line removed.
well i have some mods
ported heads
long headers
bigger crank pulley (+6lb)
single blade throttle body
intake K&N
injectors 47 lbs
pistons and connecting rod forged
among other minor

so what pressure it shoulb be at idle and with the vac line removed?

thanks
decipha
Posts: 4955
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: FUEL PRESSURE REGULATOR

Unread post by decipha »

If I were to tune it then I would set it to 60psi base pressure

if its already tuned though you have to set it to the pressure the tuner tuned it at.

47s are a waste stock is 42
best bet is 80lb minimum
jgomez
Posts: 8
Joined: 2022 Jul 19, 16:05
Location: culiacan, sinaloa, mexico
Vehicle Information: 2003 ford lightning NLP2

Re: FUEL PRESSURE REGULATOR

Unread post by jgomez »

ok thanks so much i gonna do the change

one more think whats do you mean "set it to 60psi base pressure"
with the vac line removed or with the vac line on?

thank you for help me
decipha
Posts: 4955
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: FUEL PRESSURE REGULATOR

Unread post by decipha »

base fuel preasure can only be set with the vac line off

http://efidynotuning.com/inj.htm
jgomez
Posts: 8
Joined: 2022 Jul 19, 16:05
Location: culiacan, sinaloa, mexico
Vehicle Information: 2003 ford lightning NLP2

Re: FUEL PRESSURE REGULATOR

Unread post by jgomez »

decipha wrote: 2022 Aug 08, 21:23 If I were to tune it then I would set it to 60psi base pressure

if its already tuned though you have to set it to the pressure the tuner tuned it at.

47s are a waste stock is 42
best bet is 80lb minimum
ok then set the base pressure to 60 psi with the 47lb injectors.
It will take me a while to have the 80lb but when I have it, what base pressure should I have on the regular?

The other question, how do I tell the pcm that the base pressure is now 60psi? I am using ADVANTAGE III, what parameter should I change?
I attach some images to know if it is any of those parameters
fuel pressure2.png
fuel pressure1.png
Thank you very much for your help and above all patience.. I'm doing my own tune
decipha
Posts: 4955
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: FUEL PRESSURE REGULATOR

Unread post by decipha »

you can 40 psi base with the 80s no prob or 65psi if you plan on making 800rwhp

read the fuel write up on the homepage

you have to download the injector data sheet for your injectors and then interpolate all the deltap multipliers for 60 psi

come up with all the actual values and then set the high slope in the tune to 30 lbs/hr

then take 30 and divide your actual high slope that becomes your scaling percentage

apply that to all your actual injector values other than the offset and plug that in to your tune

apply the scaling percentage to the actual maf transfer and transient fuel too.

Its covered in the fuel write up.

btw sct sucks for the eec's (2004 and older). Youd be far better off getting a quarterhorse.
jgomez
Posts: 8
Joined: 2022 Jul 19, 16:05
Location: culiacan, sinaloa, mexico
Vehicle Information: 2003 ford lightning NLP2

Re: FUEL PRESSURE REGULATOR

Unread post by jgomez »

decipha wrote: 2022 Aug 10, 19:31 you can 40 psi base with the 80s no prob or 65psi if you plan on making 800rwhp

read the fuel write up on the homepage

you have to download the injector data sheet for your injectors and then interpolate all the deltap multipliers for 60 psi

come up with all the actual values and then set the high slope in the tune to 30 lbs/hr

then take 30 and divide your actual high slope that becomes your scaling percentage

apply that to all your actual injector values other than the offset and plug that in to your tune

apply the scaling percentage to the actual maf transfer and transient fuel too.

Its covered in the fuel write up.

btw sct sucks for the eec's (2004 and older). Youd be far better off getting a quarterhorse.
ok im going to read about fuel on the homepage...so if sct sucks what tuning program do you recommend me?
decipha
Posts: 4955
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: FUEL PRESSURE REGULATOR

Unread post by decipha »

Post Reply