Jump to content
SAU Community

Fuel Pump Big Enough?

dori33

By dori33,
in Engines & Forced Induction

 Share

Recommended Posts

Simon-S14 Grand Master

Simon-S14

Posted
Posted

but Im already running a 040 in-tank and making 290rwkw on 550cc next going to E85 using 840cc injectors and same pump Im thinking so far...

why do you need to use 740cc to make 280rwkw???

you dont... 740's are plenty big enough for that power. im doing 360 ish rwkw on 800cc's with plenty head room. also on e85.

the fuel pump however is pushing it. i'd fit an 044 in the tank.

SargeRX8 Grand Master

SargeRX8

Posted
Posted

hmm, just wondering how old was the pump, were you running a larger power wire with a relay (to get consistent 13v)

I wasn't running this mod. My fuel pump died because it failed, it didn't hit its limits but I would say on E85 you will be pushing it.

75coupe I don't thin you'd get away with 500cc and E85 for that power...

Ive got a Bosch 040 replacement coming in and gonna drop that back into the tank then attach a surge tank with probably a 044 or another pump to it.

SargeRX8 Grand Master

SargeRX8

Posted
Posted (edited)

you dont need larger than 500cc and you dont need e85 to make 280rwkw

So 500cc are enough for 280rwkw on E85? I know you dont need E85 for that power but if you wanted it I think the injectors are too small... Some people might want to to keep the EGT down.

Edited by SargeRX8
Brezza Proficient

Brezza

Posted
Posted

why are you spending the extra $$ in changing your car to E85 for a power level that can easily be achieved on PULP??

seriously, its gonna be harder to get E85 than PULP because of limited stations selling it. you wouldn't want to buy it by drum from any race fuel place because its $2.50 per L or more

all the time in tuning and getting your fuel system upgraded to handle the additional flow seriously outweighs any benefits of E85 at your goals.

i think on this forum some people are getting a little too in love with E85, its good for knock protection and can make more power on very high boost applications and high comp motors.

but on most street skylines, their comp ratios arent high enough to get the full benefit of E85 and most arent running super levels of boost 25psi or more.

on my GTR i could get 300rwkw everyday on 18psi on PULP which is more than your power goals are.

i put my GTR on E85 when it wouldnt make anymore than 350rwkw on PULP at 22psi, i didnt want to do any headwork and thought that E85 might be able to give me that extra bit to hit 500rwhp

but more than $2000 later on 1000cc injectors, 2 fuel pumps, modification to fuel lines for the additional flow.

i'm running 24.5psi of boost and only manage 365rwkw

but speaking with others who have reached the threshold of PULP on RB26/30 builds (which have higher comp ratio) and they also run higher boost the benefits of E85 are huge.

so you can take my advice and save yourself some money, or you can spash out and brag to everyone on the forum that you're too running E85 in your skyline but still have a relatively lowing power level.

75coupe Grand Master

75coupe

Posted
Posted

were still only talking about 280rwkw for a street car... it will cost the same to upgrade the fuel system to E85 as if your target was 320rwkw but then were talking different turbos surely and thats another quite large expense. so why run E85 simply for knock protection, cant you just run a really safe tune... oh but you want to squeeze the enth amount of power out of the turbo too cause you dont want to loose response on your street driven car... you cant have it all, well you can but it will just cost more money...

I still dont quite understand why you would need 740cc injectors to make 280, even if its E85, Im on pulp with 550cc and only at 50-70% injector duty making 289rwkw...

we still dont even know what turbo the op is intending on using?

Brezza Proficient

Brezza

Posted
Posted

yeah it was only a 15kw gain.

but i had to add an extra 2psi

the midrange torque is insane! but then again its expected when running 24psi of boost.

spending all the money on fuel system isnt worth it if the power is achievable on PULP.

someone mentioned having it as knock protection and still keeing smaller turbo for response.

its a pretty big expense for knock protection, although united E85 is slighty cheaper than Pump Fuel you do use more. i went from using maybe 16L per 100kms to using no less than 21L per 100kms

and this is on a low boost of 18psi and not much throttle, if i go high boost and am really heavy on the pedal it'll easily drink 25L for 60-70kms of driving

at the track day i used about 90L of fuel for not even 170kms,

i was averaging a jerry can every 2 x 15min sessions

dori33 Collaborator

dori33

Posted
  • Author
Posted

thanks guys, dont think the end result is realy worth it for the power figures i want. The car will be drifted so the least lag and a good midrange is what im after. Wanted to see if an 0p6 high flow could make that kind of power on E85 but its obvious the cost to make it work out-ways the benefits.

cheers guys

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

    • Murray_Calavera
      "Cheap" bolt on turbo on RB25DET NEO

      By Murray_Calavera · Posted

      The fab work can be as simple as a couple of silicon hoses and clamps to the factory piping. 
    • joshuaho96
      "Cheap" bolt on turbo on RB25DET NEO

      By joshuaho96 · Posted

      Just sounds like either way you need to do some fab work to get everything to fit, so why limit yourself at that point? If the GCG high flow option is zero effort in and out swap though I'd probably do that. It's almost certainly lowest risk, lowest cost, etc. The HKS GTIII-RS option that Kapr mentioned is laughably expensive for what it is, they charge the exact same for two turbos on the RB26 so their margins are off the charts on that thing.
    • GTSBoy
      "Cheap" bolt on turbo on RB25DET NEO

      By GTSBoy · Posted

      Intake manifold is not a part of the issue. The turbo bolts to the exhaust manifold. That is easy. But close your eyes and picture the physical situation. That is a T3 flange on the manifold and a T3 flange on the turbo. As long as any new turbo has a T3 flange on the exhaust housing, that exhaust housing will bolt to the exhaust manifold. This places the exhaust housing in the same place as the stock one. But now move your mental attention a little further forward. The location of the compressor housing is set by the length of the turbo's core. The stock turbo had a long core. Let's say that it is..... 100mm long. So that would place the compressor housing 100mm forward of the exhaust housing. But a highflow, might well have a centre core that is shorter. Let's say that it is only 70mm long. Now the compressor housing will be 30mm further back in the engine bay than the stock one. This DOES move the turbo's compressor outlet backwards. It also moves the compressor's inlet backwards. You will very likely have to do some work to both the inlet and outlet piping to make everything connect again. I am not say this to make it out to be a bigger deal than it is. I am just pointing out that "bolt on" is sometimes not quite bolt on. The highflow from GCG that Murray linked above (https://gcg.com.au/turbo-charger-upgrade-skyline-gtst-2iu-xtrgts-s1.html ) uses a core that is the same length as the stock core, and so does not require this extra work. It will look very much like the stock turbo. No-one uses GTR turbos of any flavour (stock, or aftermarket) in a single turbo application on RB20/25. It's not a thing. Yes, people have been putting on GT3076, GTX3076 (and bigger and smaller versions of those) and G30s (of various sizes) onto RB20/25 since forever. But these are not "bolt on". Everything except the 4 bolts to the exhaust manifold change with these. And genuine Garretts are expensive. Non-gen, like Pulsar, etc, are cheaper, variously as good or nearly as good. But still not bolt on. No-one in the right mind would pay for an HKS turbo. Not in this modern day and age. Well, yes, the GCG highflow. You could ask HG what he can do to make the compressor housing sit in the original location. There are surely others doing highflows around the world. And some of the eBay/Temu ones (as reported by Dose) work and don't die. Bit of a lottery though. I would send your turbo to GCG (here in Oz) to be highflowed if you want a trivial no-extra-work option. But seriously, the work required to change inlet and outlet piping is not that hard. That's a boost control problem, not a turbo problem.
    • Kapr
      "Cheap" bolt on turbo on RB25DET NEO

      By Kapr · Posted

      Thank you all for the replys 🙂 I know that intake would be different but that is one pipe at it is not that hard to get(custom one). I meant mainly bolt to the stock manifold and the turbo elbow. I looked and many sites/forums but they are just "old" with some old HKS turbos from GT-R i guess? What about some Garrets?  Or any other turbo? Is there even a turbo which i can just bolt on? 😄 And yeah i know about that new HKS but that is like 2000k USD without taxes/shipping in here   Iam getting a touch up tune but my "problem" is that on the "not" hot day iam getting peaks around 0,9 bar...and when it was around 15 Celsious i saw peak around 1 bar which is just too much for stock turbo. And of course turbo is old and i like to get some new one for a piece of mind 🙂 
    • GTSBoy
      new here

      By GTSBoy · Posted

      I'm working on the assumption that our friend Jasmine here is a Russian (or, possibly Ukrainian) spammer/spambot, based purely on the number of such that I have been having to neuter in the last few weeks. IP address for the OP above was in WA. But that could have been via VPN. Posting at quarter to 4 in the morning is a good sign of being from somewhere in Europe. The last Jasmine that I kicked in the cooch was IP addressed in Ukraine. Even that could have been via VPN, and the bitchbot could have been from Russia, Serbia, China or anywhere. Regardless, was a spambot, so I killed it with fire. The fact that our new friend Jasmine here did not respond in any way to my tart query strongly suggests to me that this OP was just the establishment phase of a user able to be activated for spamming in a week, or 3 or 10.
×
×
  • Create New...