Tuning with fuel pressure regulator.
#1
Tuning with fuel pressure regulator.
For those that have used an adjustable FPR to more or less tune your afr. how much does the fuel pressure affect the a/f ratio. for example if i lower the pressure by 3psi, how much should i expect the afr to move up (leaner)?
#3
Originally Posted by MaximaSE96
most of us also use an SAFC or VAFC to tune after raising the fuel pressure .5 bar
#5
Originally Posted by MaximaSE96
if ur just tuning with AFPR then u might want to get a wide band O2 to monitior those readings...spend the extra 150 an get an afc that way u can get timing too
#9
Originally Posted by diymaximakid
get a wideband if your goin to play with the fuel pressure
#11
Hope this helps best I can offer, I have a s10 with a 350 and 650 holley and when I add fuel pressure at the fpr it gained a few hp in the upper rpm range, but on the other side you can go too far and start to lose power. I know the example I used is not a max and a 350 with a holley is alot simpler but hope this helps
#12
Originally Posted by streetzlegend
cant i just dyno and do the same? i kno u need to see the a/f i just want a simple yes or no. can you tune with fuel pressure regulator?
#13
My mods are: Ypipe, catback 2.5, 00vi (with 4thgen lower IM), CAI, UDP (useless), walbro 190 (for nitrous), nismo afpr, and tranny stuff (auto).
I did dyno, but the dyno was before 00vi and before 190 walbro. So I dont kno how accurate it would be, the a/f ratio curve was pretty smooth and almost same ratio across the entire rpm range. was at 12.5 then dropped too about 12 at 4.5K and back up to 12.5 to redline.
I did dyno, but the dyno was before 00vi and before 190 walbro. So I dont kno how accurate it would be, the a/f ratio curve was pretty smooth and almost same ratio across the entire rpm range. was at 12.5 then dropped too about 12 at 4.5K and back up to 12.5 to redline.
#15
Originally Posted by streetzlegend
My mods are: Ypipe, catback 2.5, 00vi (with 4thgen lower IM), CAI, UDP (useless), walbro 190 (for nitrous), nismo afpr, and tranny stuff (auto).
I did dyno, but the dyno was before 00vi and before 190 walbro. So I dont kno how accurate it would be, the a/f ratio curve was pretty smooth and almost same ratio across the entire rpm range. was at 12.5 then dropped too about 12 at 4.5K and back up to 12.5 to redline.
I did dyno, but the dyno was before 00vi and before 190 walbro. So I dont kno how accurate it would be, the a/f ratio curve was pretty smooth and almost same ratio across the entire rpm range. was at 12.5 then dropped too about 12 at 4.5K and back up to 12.5 to redline.
#16
Originally Posted by sloppymax
Is that a/f during spray or a motor run? I advised against blindly removing fuel when it was motor, I certainly would not pull fuel with the fpr if you are going to spray on it.
#17
Originally Posted by streetzlegend
yea thats what 90% of everyone uses, but I dont want a afc right now and i already have an adjustable fpr so mineswell learn about it. maybe i can lean my mixture out a lil with it.
These are very important points and should be added to your mental cliff notes. Do not ignore this information.
Originally Posted by sloppymax
i had a vafc2 and wideband o2 going so it was safe to pull a certain amount of fuel from different rpms.. .........................not every rpm needs fuel taken out...........
you will find not all rpms need the fuel taken out which is what will happen if you just lower the fuel pressure ............I advised against blindly removing fuel.
you will find not all rpms need the fuel taken out which is what will happen if you just lower the fuel pressure ............I advised against blindly removing fuel.
#18
Originally Posted by NmexMAX
The AFC is a very raw tune. What you're taking about is even more raw.
These are very important points and should be added to your mental cliff notes. Do not ignore this information.
Quoted for truth
These are very important points and should be added to your mental cliff notes. Do not ignore this information.
Quoted for truth
Thread
Thread Starter
Forum
Replies
Last Post
litch
4th Generation Maxima (1995-1999)
123
01-04-2024 07:01 PM
jmlee44
4th Generation Maxima (1995-1999)
8
10-02-2022 02:13 PM
My Coffee
New Member Introductions
15
06-06-2017 02:01 PM