Jump to content
SAU Community

Fuel Pump

OoskylineoO

By OoskylineoO,
in Engines & Forced Induction

 Share

Recommended Posts

Careless Contributor

Careless

Posted
Posted

they'll both hold up fine. as long as it can keep the pressure up, which either a walbro or a gtr pump will be able to do, in the case of N/A.

So get whatever is cheaper for you.

GTR comes with 300hp factory. and can pump for about 400 or more. so you'll be fine with either.

Link to comment
Share on other sites
abu Grand Master

abu

Posted
Posted (edited)
No.. Not unless the old pump was on its last legs and leaning out.

Thats right, there is no point.

If anything it will just run slightly more rich, which is pointless..

Edited by abu
Link to comment
Share on other sites
R34GTFOUR Mentor

R34GTFOUR

Posted
Posted
Thats right, there is no point.

If anything it will just run slightly more rich, which is pointless..

why will it run more rich?

fuel pressure is controlled by the FPR so at the end of the day you can stick a bigger fuel pump and the extra flow provided if its not needed with just be sent back to the tank.

As mentioned, the pump will only make a difference if the old one isnt up to the task, if the old one is capable to send the amount of fuel needed to hold the correct pressure to the fuel rail right through the rev range the wont be a difference.

Link to comment
Share on other sites
unarmed_skyline Experienced

unarmed_skyline

Posted
Posted

if the new pump is capible of flowing more fuel at the same pressure yes you will run rich, you would need an adjustable fuel press reg to tune it to optimum presure then you might be able to squese a little bit out of the upgrade but its really not worth it at all untill you neer to or over the flow rate of the current fuel pump, if youve upgraded a lots of things already, ie exhause intake cams, ecu, or turbo conersion ect then yes you will need one but on a stock car its pointlesss

Link to comment
Share on other sites
R34GTFOUR Mentor

R34GTFOUR

Posted
Posted
if the new pump is capible of flowing more fuel at the same pressure yes you will run rich, you would need an adjustable fuel press reg to tune it to optimum presure then you might be able to squese a little bit out of the upgrade but its really not worth it at all untill you neer to or over the flow rate of the current fuel pump, if youve upgraded a lots of things already, ie exhause intake cams, ecu, or turbo conersion ect then yes you will need one but on a stock car its pointlesss

the r33 that we installed a 023 into didnt change in the slightest with the new pump, and thats a pump that is rated to 700hp. Didnt run more rich, and nothing else was changed ie it still had the stock fpr.

i know what your saying but in stockish appilications i dont see how it would make a noticeable difference to the afr

Link to comment
Share on other sites
SKiT_R31 Experienced

SKiT_R31

Posted
Posted
the r33 that we installed a 023 into didnt change in the slightest with the new pump, and thats a pump that is rated to 700hp. Didnt run more rich, and nothing else was changed ie it still had the stock fpr.

i know what your saying but in stockish appilications i dont see how it would make a noticeable difference to the afr

i push a bosch 023 on my car, pushed the fuel pressure from 32psi to 40psi, but thats probably just because of the higher pressure from the pump on the adjustable fpr.

i noticed more response, also - when you revved the car with the old pump the fuel pressure dropped right back and slowly build up (leaning the car obviously when you first stomp it) now it never dips, so its better in that respect.

but then my car needed it, as it now makes over 150kw, and it had a stock r31 pump made to feed about 80...

Link to comment
Share on other sites
mad082 Grand Master

mad082

Posted
Posted

the only time a new pump will make any difference is if the old one isn't doing the job. i installed a 040 into a mates 33 and it dropped about 15hp cause the old pump was dying and causing it to lean out a bit. the new pump dropped the AFRs to where they should be, and stopped it pinging its arse off.

Link to comment
Share on other sites
SKiT_R31 Experienced

SKiT_R31

Posted
Posted
the only time a new pump will make any difference is if the old one isn't doing the job. i installed a 040 into a mates 33 and it dropped about 15hp cause the old pump was dying and causing it to lean out a bit. the new pump dropped the AFRs to where they should be, and stopped it pinging its arse off.

exactly, there wont be a gain in having a bigger pump, but makes things a bit more reliable if your starting to ask for a fair bit more power than stock

Link to comment
Share on other sites

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

    • MBS206
      Skid pans in/around Sydney?

      By MBS206 · Posted

      Maybe SAUNSW could see howany members would do a motorkhana day if Schofield's is still available for a reasonable price...
    • MBS206
      Skid pans in/around Sydney?

      By MBS206 · Posted

      Skip the concrete, we just need to smooth a field. Mark knows how to drive a grader Duncan   I reckon 100x100 flat area for skid pan style, and then some sort tracks for rally... Duncan's already got a rally car on the premises to...
    • GTSBoy
      PRP RB26 cast block + head prototype running

      By GTSBoy · Posted

      Well, yeah, the RB26 is definitely that far off the mark. From a pure technology point of view it is closer to the engines of the 60s than it is to the engines of the last 10 years. There is absolutely nothing special about an RB26 that wasn't present in engines going all the way back to the 60s, except probably the four valve head. The bottom end is just bog standard Japanese stuff. The head is nothing special. Celicas in the 70s were the same thing, in 4cyl 2 valve form. The ITBs are nothing special when you consider that the same Celicas had twin Solexes on them, and so had throttle plates in the exact same place. There's no variable valve timing, no variable inlet manifold, which even other RBs had either before the 26 came out or shortly afterward. The ECU is pretty rude and crude. The only things it has going for it are that the physical structure was pretty bloody tough for a mass produced engine, the twin-turbos and ITBs made for a bit of uniqueness against the competition (and even Toyota were ahead on the twin turbs thing, weren't they?) and the electronic controls and measuring devices (ie, AFMs, CAS, etc) were good enough to make it run well. Oh, and it sounds better than almost anything else, ever. The VR38 is absolutely halfway between the RB generation and the current generation, so it definitely has a massive increase in the sophistication of the electronics, allowing for a lot more dynamic optimisation of mapping. Then there's things like metal treatments and other coatings on things, adoption of variable cam stuff, and a bunch of other little improvements that mean it has to be a better thing than the RB26. But I otherwise agree with you that it is approximately the same thing as a 26. But, skip forward another 10 years from that engine and then the things that I mentioned in previous post come out to play. High compression, massively sophisticated computers, direct injection, clever measuring sensors, etc etc. They are the real difference between trying to make big power with a 26 and trying to make big power with a S/B50/54 (or whatever the preferred BMW engine of the week is).
    • V35_Paul
      Thinking of getting a Q50 300hp and just tuning it instead of getting the Q50 Red or 400R

      By V35_Paul · Posted

    • joshuaho96
      PRP RB26 cast block + head prototype running

      By joshuaho96 · Posted

      Is the RB26 actually that far off the mark? Honestly from where I'm sitting a VR38DETT is not actually that much more advanced than the RB26. Yes, there is a scavenge pump on the VR38, it's smarter in a number of ways but it's not actually jumping out to me as alien technology. Something like a B58 or V35A-FTS on the other hand has so many surprising little design features that add up to be something that just isn't comparable. 
×
×
  • Create New...