Jump to content
SAU Community

Recommended Posts

Hey guys, I've got a r33 with an rb25det in it, following are the mods;

-splitfire coilpacks

-power fc

-FMIC

-3' turbo back exhaust

-Z32 afm

-570cc denso injectors

-walbro 255 fuel pump

-Hypergear ATR43SS-2 turbo waiting to be installed

-gizmo EBC

And probably a few more

Question is, im chasing about 270-280 with the new turbo and tune, however my tuner was saying the injectors might not be big enough and should upgrade a 460 fuel pump to mitigate the issue. Talked to a few other people and they said don't bother just upgrade injectors.

What does everyone reckon ? Upgrade fuel pump and keep and injectors and scrape by or just go bigger injectors, and if so, what size and brand ?

Thanks in advance for any help

Link to comment
https://www.sau.com.au/forums/topic/457915-injector-size/
Share on other sites

The injectors are large enough. They will support over 300 rwkW. That is getting a bit close to the margin, so if you want some comfort then sure, upgrade. Your best bet would be Bosch EV14 based ones. Probably 1000cc would be the best choice. They'll be much better injectors than those nasty old school Denso ones anyway, so don't worry about them being too big.

The fuel pump will probably be fine. Too big a fuel pump causes unnecessary fuel heating - so it's not a free choice anyway.

Link to comment
https://www.sau.com.au/forums/topic/457915-injector-size/#findComment-7560423
Share on other sites

Well this has just made the decision that much harder, tuner and mechanics saying go bigger. But thanks for the feed back guys

Well mine made 314AWKW with 550s and had plenty of room for more. Name the workshop that says you won't make 300 on 570's !! I reckon they will do 350 at least if not more.

However if you have money to burn stick some ID2000s in and you will not have to change them for a while.

Link to comment
https://www.sau.com.au/forums/topic/457915-injector-size/#findComment-7560643
Share on other sites

570cc injectors at 80% duty cycle 1 bar of boost will make 324kw - ish on 98 , I recommend not going over 80% duty cycle, and more fuel is better than not enough. Your 255 fuel pump will be fine aswell. I wouldn't change anything.

Edited by skyline32sup
Link to comment
https://www.sau.com.au/forums/topic/457915-injector-size/#findComment-7562464
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


  • Similar Content

  • Latest Posts

    • Hi guys . Can someone help me  I bought an Android screen for my Nissan fuga but it won't turn on   
    • My guesstimate, with no real numbers to back it up, is it won't effect it greatly at all.its not a huge change in position, and I can't see the air flow changing from in turbulence that much based on distance, and what's in front of it. Johnny and Brad may have some more numbers to share from experience though.
    • Which solenoid? Why was it changed? Again, why was this done? ...well, these wear..but ultimately, why was it changed? Did you reset the idle voltage level after fitment? I'm just a tad confused ~ the flash code doesn't allude to these items being faulty, so in my mind the only reason to change these things, would be some drive-ability issue....and if that's the case, what was the problem? Those questions aside, check if the dropping resistor is OK ...should be 11~14 ohms (TCU doesn't throw a flash code for this) ~ also, these TCU designs have full time power (to keep fault code RAM alive), and I think that'll throw a logic code (as opposed to the 10 hardware codes), if that power is missing (or the ram has gone bad in the TCU, which you can check..but that's another story here perhaps).
    • Question for people who "know stuff" I am looking at doing the new intake like the one in the picture (the pictured is designed for the OEM TB and intake plenum), this design has the filter behind the front bar, but, the filter sits where the OEM duct heads into the front bar, and the standard aperture when the OEM ducting is removed allows the filter to pulled back out of the front bar into the engine bay for servicing, a simple blanking plate is used to seal the aperture behind the filter This will require a 45° silicone hose from the TB, like the alloy pipe that is currently there, to another 45° silicone hose to get a straight run to the aperture in the front bar Question: how will it effect the tune if I move the MAF about 100-150mm forward, the red is around where my MAF is currently, and the green would be where it would end up Like this This is the hole the filter goes through  Ends up like this LOL..Cheers    
    • Despite the level up question, actually I do know what that is....it is a pressure sender wire.  So check out around the oil filter for an oil pressure sender, or maybe fuel pressure near the filter or on the engine. Possibly but less likely coolant pressure sensor because they tend to be combined temp/pressure senders if you have one. Could also be brake pressure (in a brake line somewhere pre ABS) but maybe I'm the only one that has that on a skyline.
×
×
  • Create New...