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View Full Version : How do I adjust nismo fuel pressure regulator

korco
12-19-2011, 03:12 PM
So I'm having a problem with my sr20det, when the Rpms hit over 5k my car seems like its not getting enough fuel so it sputters like if something is holding it back, I'm thinking it might not being gettin enough fuel I current don't have a fpr gauge so idk whats it reading.. I want to try to adjust it but idk how to adjust the nismo fpr I know it had a screw but don't know what direction to move it so it can get move fuel..

Help?!
badbob2121
12-19-2011, 03:25 PM
So you installed an adjustable FPR with no way to monitor what your adjusting?

getting a fuel pressure gauge should be at the top of your to do list...

then start to trouble shoot any problems you have....
korco
12-19-2011, 03:26 PM
Car came with a Sr and never had a gauge, I checked for vaccum leaks and boost leaks and nothing
So I'm gonna get a gauge soon
badbob2121
12-19-2011, 03:29 PM
Car came with a Sr and never had a gauge, I checked for vaccum leaks and boost leaks and nothing
So I'm gonna get a gauge soon

I assume your trying to say that you just bought the car, it already had a Nismo FPR installed, and it sputters...

regardless, if you have the nismo fpr, you need a gauge to reference your fuel pressure
cotbu
12-19-2011, 03:47 PM
Yes, you need a gauge to adjust fuel pressure! Also, do you know if the car has been tuned? If you don't know then you have to set it to stock fuel pressure. Operating temp, Idle, vacuum line capped, 43.6psi IIRC. Your symptoms can also be caused by too much fuel FYI.
korco
12-19-2011, 03:52 PM
No I did not just buy the car I had the car for almost a year.. And it just suddenly started doing that about a month ago.. And. It hasn't been tuned but I will be doing a tune sometime soon
silver350z05rb
12-19-2011, 08:01 PM
Get a Gauge
project_silvia
12-19-2011, 08:06 PM
do you atleast have a wideband to see what you AFR is ?
korco
12-20-2011, 12:03 AM
Yes I do have one...
4x4le
12-20-2011, 09:58 AM
so then why are you thinking its not getting enough fuel? the wideband should tell you if it is or not
korco
12-20-2011, 11:33 AM
My car has air fuel rtio gauge..
I've made a post about this before
And they said I need a gauge that reads from the receiving fuel line
korco
12-20-2011, 11:51 AM
car1 - YouTube (http://www.youtube.com/watch?v=Lso_dgP8W7E&feature=youtube_gdata_player)

car3 - YouTube (http://www.youtube.com/watch?v=uk7EHL3wZ_s&feature=youtube_gdata_player)
Here's a video of the car sputtering and afr
Darren
12-20-2011, 01:20 PM
You say the car is not tuned, but you have a FC Commander?

something's not adding up here...

Also... AFR's at idle should be 14.7, not 11.9...
4x4le
12-20-2011, 01:49 PM
Honestly, i think if i were to try to help you, we still wouldnt be on the same page. Both vids are worthless. Show us the wideband during the pull.......
korco
12-20-2011, 02:00 PM
Yea it hasn't been tuned in a while and yea I do have a fc commander
And I don't really know how to work that..

Ok I'll be sure to make a video of that when I can and post it..
And the afr always stays at 11.9 idk why it use to run good till the sputtering started
korco
12-20-2011, 04:14 PM
Since you said that does that mean my car isn't giving enough fuel or ????


You say the car is not tuned, but you have a FC Commander?

something's not adding up here...

Also... AFR's at idle should be 14.7, not 11.9...
cotbu
12-20-2011, 07:00 PM
http://www.lavc.cc.ca.us/math/samples/benefit/intro.html ability to benefit

Sent from My Highly Tuned Vibrant!
korco
12-20-2011, 07:03 PM
What's that^
cotbu
12-20-2011, 07:05 PM
Its a test to show ability to learn, or what can be taught to you, also a joke! I have bad taste sorry l. You need to learn how the stuff in your car works or noone can help you. Your wideband for instace. 11.9 is rich at idle and is bad. idling at 1500rpm + not good. You could have all sorts of problems going on and you're not really helping
korco
12-20-2011, 07:22 PM
I couldn't even open the link hah.. Funny I guess.. Yeah I kinda figured it would be bad it use to read 14.0+ so idk.. Ima just buy that gauge swap it on as try to adjust it my self
4x4le
12-20-2011, 07:40 PM
Ok, dont take this offensivly, but I can tell you dont have a great understanding of how your engine works, what it needs, how to adjust things ect. You have allot of learning to do if you plan to have a car like this and your current problem isnt going to wait on you to learn whats going on. I highly doubt your problem is the fpr.

What you need to do is take your car to a reputable tuning shop and have this issue (or all if your issues) sorted out and have them dyno tune your car. If you dont do this your going to be rebuilding your current engine on top of having to do all i mentioned earlier.

Also, quit letting it go high into the rpms, dont drive it hard, actually drive something else if you can. Your going to wash out your rings.

sent from my rooted thunderbolt