Fuel Pressure Regulator - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Prefabbed Turbo Kits A place to discuss prefabricated turbo kits on the market
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools
Old 03-22-2007, 09:38 AM   #1
Junior Member
Thread Starter
 
Join Date: Mar 2007
Location: Singapore
Posts: 130
Total Cats: 0
Default Fuel Pressure Regulator

Dear All,

I've just purchased an adjustable fuel pressure regulator.

I'm curious though, what would be the optimal fuel pressure for a 1993 NA6? Mostly stock cept for K&N cone filter, some plugs and wires, and a free flow exhaust.

Also, I'm not very sure I needed a fuel pressure regulator for a stock miata. Anyone can extol the virtues of having one? And anyone know the pressure that i should set?
qes78 is offline   Reply With Quote
Old 03-22-2007, 10:04 AM   #2
AFM Crusader
iTrader: (18)
 
olderguy's Avatar
 
Join Date: Oct 2004
Location: Wayne, NJ
Posts: 4,438
Total Cats: 84
Default

The stock fuel pressure regulator on the end of your fuel rail is all you need for a non FI car.
olderguy is offline   Reply With Quote
Old 03-22-2007, 04:12 PM   #3
I'm Miserable!
iTrader: (5)
 
Join Date: Sep 2005
Location: SLC, Utah
Posts: 1,591
Total Cats: 0
Default

yeah, the Miata runs rich from the factory, so you are fine with those minor mods.
zoom2zoom is offline   Reply With Quote
Old 03-22-2007, 04:29 PM   #4
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

well i am gonna slightly dissagree if you lower the pressure a smidge you will lean out the mix and make more power the way you are i would try 37 psi and work out from there, depending on how it feels. Our motors run almost 10-1 in NA form and could benefit quite abit from leaining out up top for more powaah. So just monkeyh with it abit. And BTW a guage onthe return is useless you need one on the feed to tell what the atual pressure is. GL man
magnamx-5 is offline   Reply With Quote
Old 03-22-2007, 04:30 PM   #5
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,872
Total Cats: 1,790
Default

unless you remove the oem fpr, you arent going to see under 50psi at WOT
Braineack is offline   Reply With Quote
Old 03-23-2007, 10:44 AM   #6
Junior Member
Thread Starter
 
Join Date: Mar 2007
Location: Singapore
Posts: 130
Total Cats: 0
Default

I've removed the oem FPR.
Lean it out at the high rpms?
how low a pressure are we talking about here?
qes78 is offline   Reply With Quote
Old 03-25-2007, 12:40 AM   #7
Junior Member
Thread Starter
 
Join Date: Mar 2007
Location: Singapore
Posts: 130
Total Cats: 0
Default

Another quick question, does having too high a fuel pressure result in higher operating temperatures. I boosted the fuel pressure up to 35psi and i realised that my car was running at around 103 deg celcius instead of the normal 93....this is at a constant speed of 100kmh
turning it back down to 30 resulted in 93 deg again.
I'm running about 16deg of timing...
qes78 is offline   Reply With Quote
Old 03-25-2007, 03:26 PM   #8
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

well the leaner mix willl make for a more complete burn but cylinder pressures etc will go up as well cuase you dont have the extra heat absorbtion of the fuel. 35 Psi might be a little low you might try 45 -40 and see how it does you mentioned nothing on performance with the different FP. Elaborate please.
magnamx-5 is offline   Reply With Quote
Old 03-26-2007, 09:54 AM   #9
Junior Member
Thread Starter
 
Join Date: Mar 2007
Location: Singapore
Posts: 130
Total Cats: 0
Default

As far as I can tell, there's no discernible difference in power between the 2 settings. The only difference I could tell was that the temperature seemed to rise when I increased the fuel pressure.
and the car seems to take longer to crank and start up.....
qes78 is offline   Reply With Quote
Old 03-26-2007, 06:01 PM   #10
Junior Member
iTrader: (2)
 
Join Date: Jul 2006
Location: Birmingham, Alabama
Posts: 209
Total Cats: 0
Default

We were experimenting on the dyno one day when I was taking a baseline on my 1993 car prior to installing the turbo and we leaned out the mixture by tightening the clock spring on the mass air sensor about 7 clicks. We picked up 3-5 horsepower... and it didn't cost anything.
92Black&Tan is offline   Reply With Quote
Old 03-27-2007, 09:08 AM   #11
Junior Member
Thread Starter
 
Join Date: Mar 2007
Location: Singapore
Posts: 130
Total Cats: 0
Default

Thanks for the information.
I'm really getting worried here though, car seems to be running really hot..
Help
qes78 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 58 12-13-2017 10:04 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM
Low oil pressure after 1.8 swap and new turbo setup JesseTheNoob DIY Turbo Discussion 15 09-30-2015 03:44 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 02:51 AM.