Jump to content
SAU Community

Recommended Posts

Hey,

I've just ordered a Tomei fuel pressure reg, and noticed I shanked it. I've ordered the type L which is for high boost setups.

Here are the specs:

post-93817-13935642253751_thumb.jpg

I've got an R32 GTR, HKS GTSS's, poncams, 700cc injectors, HKS Fuel pump, HKS turbo back. Can I still use the type L for 18-22psi?

Or should I cut it away and get the type S?

You should be OK. It will try and maintain pressure at X+manifold pressure, so a larger valve will need to be slightly more closed than a smaller valve at the same pressure.

If you are really worried borrow a fuel pressure sensor and hook it up to the regular before starting the car. You will quickly see if it is holding the correct pressure at idle - which is when the regulator is doing the most work.

Hope that makes sense!

Also, I think high boost / low boost is misleading terminology to use for a fuel pressure regulator.

Remember the regulator is controlling the return from the rail, not the feed.

So, a regulator needs to be sized so it is large enough to return fuel from your fuel system at idle.

A larger fuel pump requires more fuel to be returned.

On boost, the regulator is returning less fuel, as more is going out the injectors.

Therefore, it follows that higher boost means less fuel to be returned.

In summary a fuel pressure regulator is not sized based on boost or power output, it is based on fuel flow rate at idle, which is when it will have to return 95% of the fuel flow back to the tank.

Yeah thanks for that. Think I'll just cut it away and go with the Type S. Wasted money and potential by the sounds of things.

If you are ever planning to go to a larger fuel pump then it is one thing you won't need to upgrade.

What is the max power rating of the HKS pump?

Nothing wrong with stock reg. How much power you chasing? Why change it?

That depends entirely on the pump setup, for example the stock regulator will not be able to control the pressure if you have 2x 044s behind it.

For the HKS pump on the other hand, yes it would likely flow enough just fine.

  • 4 weeks later...

That depends entirely on the pump setup, for example the stock regulator will not be able to control the pressure if you have 2x 044s behind it.

For the HKS pump on the other hand, yes it would likely flow enough just fine.

won't that just mean it will return more fuel to the tank? doesn't the regulator open above 43.5psi?

That depends entirely on the pump setup, for example the stock regulator will not be able to control the pressure if you have 2x 044s behind it.

For the HKS pump on the other hand, yes it would likely flow enough just fine.

Yes it will. Seen it on more than one setup, both Nismo and factory units with duel 044's.

OP, you'll be fine although it's not needed.

Yes it will. Seen it on more than one setup, both Nismo and factory units with duel 044's.

OP, you'll be fine although it's not needed.

Interesting to know!

Do you know if the dual 044 setup pressure lines were T'd together before feeding the rail, or was the rail dual entry centre return?

In my case each 044 has its own pressure line leading to each end of the rail. Which is why I went with a aftermarket FPR off the centre of the rail.

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


  • Similar Content

  • Latest Posts

    • Sorry to hear your HFM BM57 was faulty,  did you contact HFM I would hope they would be at least grateful for the information if there was some sort of manufacturing fault, you would hope they would be sympathetic even if your item was 2 years old if it had never been fitted. May I ask where it leaked from ?
    • Cats are called Bella, and Donna...  Like that poisonous plant And I remember your 2 monsters, I remember making a little bit of wee when you let them out... LOL I have already installed cat doors into the laundry where their kitty litter is, and the sun room, apart from the cat doors there's not going to be any permanent mounted stuff on the interior walls (interior doors are cheap and easy to replace) I will get a outdoor cat cage thingie once I finish the landscaping out back... https://catnip.com.au/ The only off limit areas are the main bedroom and the gym room....but, currently the cats are curled up in bed, in the main bedroom with the Mrs.....LOL, the off limits for the kittens to the main bedroom lasted about 5 minutes with Jackie I currently only have 1 free standing huge cat tree multiple level scratching post thingie in the lounge room, but, I will be getting another one soon now that I'm happy with the furniture layout in the back room and have a perfect spot for it  
    • All of this is making it seem clear that running the Coppermix twin was definitely the way to go, especially in hindsight with how insane tariffs have gotten and the strength of the USD vs yen at the time.
    • That sounds like no chance of even importing one for road registering then Now I see why Duncan wants to check LHD rules for Targa...   I wonder how "bolt in" the AWD would be if you got one imported from the US and swapped it to an AUD one
    • Not to mention they drive like a bucket of bolts! yuck!
×
×
  • Create New...