Jump to content
SAU Community

Fuel Reg base pressure

Mase

By Mase,
in Engines & Forced Induction

 Share

Recommended Posts

Mase Mentor

Mase

Posted
Posted

I've got a malpassi rising rate fuel reg in my rb20det powered s13. I had it set at about 40psi and i removed the vacuum line on my stock fuel regulator. I went from getting 350klms out of a tank to about 500klms. Off boost was more responsive and i was pretty happy with it. However i kinda think it's too good to be true so im a little worried i may be running too lean. I only have minor mods: rb25 turbo, stock boost (8psi), pod and the fuel reg. Im getting an exhaust tomorrow finally!

the injectors were recently flow tested and cleaned and are spot on. Do you think i should drop the pressure back down to 40psi, or what would be your opinion?

thanks

Jayson

Link to comment
https://www.sau.com.au/forums/topic/30184-fuel-reg-base-pressure/
Share on other sites
muffas 180 Enthusiast

muffas 180

Posted
Posted

Did you set the reg at idle with the vacuum line disconnected to 40 psi? If you set it to 40 with the vac line connected you dont need that much pressure. My reg was set on the dyno at full throttle and load to 90psi to squeeze 229.2 kws at wheels with standard injectors. The pressure at idle it 40psi with the hose connected. For standard boost 65 psi at 10psi boost will be heaps.

Michael...

Sydneykid Grand Master

Sydneykid

Posted
Posted

Hi mase. standard RB20DET fuel pressure is 36 to 38 psi at idle with the vacuum hose disconnected. So 40 psi is a little above standard, car should be running slightly richer and using more fuel. I smell a rat, I would do a power run on the dyno, watch the boost pressure and in particular the A/F ratios. One power run up through the rev range, take about 20 minutes including on and off the roller time.

Hope that helps

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • GTSBoy
      Cleaning my wheels 😍

      By GTSBoy · Posted

      Yeah, my moulds and seals are 32 years old now. I think I will continue to not use a pressure washer on it.
    • Shoota_77
      Cleaning my wheels 😍

      By Shoota_77 · Posted

      I hear the old "I'd never use a pressure washer on my motorbike" BS in the dirtbike community too.  The only people that have had a problem from using a pressure washer on anything are the people that aren't using them properly.  If you hold the wand any more than 45 cms away from pretty much anything (radiators, wiring connectors, paint, etc) you aren't going to cause any damage.  We've had detailers wreck moulds and seals on cars at work before and the only reason why is they held the pressure washer too close and on the one spot for too long.  If you have 5% more brain power than a detailer then you know not to not do that and you'll never have a problem.
    • Shoota_77
      Shoota's R33 GT-R RB30/26

      By Shoota_77 · Posted

      I'm pretty much healed up post surgery so I spent another almost full day out in the shed re-arranging everything to make room for all of the shit that I've taken off the car.  I need to get everything off the floor and away from the car for when I start making a massive mess stripping off the remaining body deadener and then for the the painting process.  Almost got the shed to a point now where I feel I can actually start working on the car again (clean shed clean mind or something!).  Almost 11 years of accumulated car parts, building supplies, tools, junk, etc have taken a long time to get in some sort of order again!  Most stuff is now boxed up and in the back shed if it's not car related.  Most people would still be horrified walking into my shed but it's significantly better than it was before!   For those that saw my separate post the other day, yeah I ordered one.... This version- I convinced myself to stop being a clown, wake up to yourself and realise it will take you 5 weeks to make one by which stage you're over working on the car again...  Maybe I am getting on top of my "mental ailments" and making smarter choices.... $1450 delivered which will take my miserable half-dutch arse a few days to get over having spent that much!  If I don't have a use for it straight away after my car is off it I might even see if there is a "rental market" for them.  See if anyone wants to hire it for a period of time.  $25 a week or something like that.  I'll worry about that when my car is actually ready to come off it though as that might be a while away!! There's now no excuses now for not ending up with an underside you could eat off! Away for kids sport the next few weekends so hopefully can get the rotisserie assembled ready to go for the car to go straight on it the next available weekend.    
    • The Bogan
      Cleaning my wheels 😍

      By The Bogan · Posted

      I always use my Karcher, but it's only a little one that I picked up from Supercheap  The only issue I ever had with a pressure washer was when I was a kid cleaning coaches, they had a hi-po industrial sized petrol jobbie that would strip paint if you got to close I saying this, we have a fairly high power washer at work with a diesel powered heater that sprays water at about 60°c, it works great for removing old wax and road grime on the underbody after some foam cannon action, albeit from a "stand off" distance of a few feet
    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      Sorry no - The sandtrap adventure ended the day, happened at the end of the last session. At that time I wasn't hearing any weird noises nor were the brakes shuddering anymore. It was only when watching the videos that I remembered I had these sounds early on!
×
×
  • Create New...