Jump to content
SAU Community

Recommended Posts

Before i buy injectors and fuel pump etc and leave the car for tuning, which size of injectors would you go for? 

I think i want to run as low power as i can with the GT28-5 turbos. But would be nice to have some room for more maybe. 
I have OEM injectors refurbished and cleaned but they wont probably be enough as someone mentioned here before?
 

Fuelpump about 255l/h - 340l/h?

something else you would change before tuning the car?

Setup:

Rb26dett with

-twin GT28-5 turbo

-JE-pistons 8.2:1

-Eagle H-Beam rods

-ACL race main and rod bearings

-Oil pump collar installed

-Older verision of LINK G4 ECU

 

 

Link to comment
https://www.sau.com.au/forums/topic/484357-rb26-setup-power-and-injectors-size/
Share on other sites

19 hours ago, Dose Pipe Sutututu said:

Why are you choosing to go with such low compression?

I actually dont know. These was ordered from Realstreetperformance, and i belive i had these recommended by them but i could be wrong. Could be the the guy building the engine that told me to get these ones as well. 

On 12/01/2023 at 7:32 AM, djr81 said:

Assume you have the ballast delete and a new AIT sensor? Plus someone who can tune TPS?

Thank you for the reminder about the ballast delete. 

AIT? Do you mean intake air temperature sensor? 

Well, i guess the tuner can tune the TPS 😬

On 11/01/2023 at 9:04 PM, GTSBoy said:

Just go straight for 1000cc Bosch ID14s from somewhere reputable. A ~340L/h TI pump would be fine. Wired properly, of course.

Okey, thank you. How lower power could i run with the 1000cc:s do you think? How much power can the engine handle? I do not want to push anything. :)

I will re-wire the fuelpump! Thanks for the reminder. 

4 hours ago, reallyspeedly said:

How lower power could i run with the 1000cc:s do you think?

Stock. If it will idle on an injector (and of course, with a decent computer, the engine will idle on 1000s) then it can run ANY power level above that (up to the limit of the injector capacity, of course).

4 hours ago, reallyspeedly said:

How much power can the engine handle? I do not want to push anything.

Most of your list of engine mods would contribute to being able to run up to the limit of what the turbos can provide - except for one thing. I would not attempt to do so without a significant oil pump upgrade, and then paying attention to the engine breathing and oil draining situation - as per the oil control thread (or the last 100-150 pages of it anyway).

  • Like 1
5 hours ago, reallyspeedly said:

I actually dont know. These was ordered from Realstreetperformance, and i belive i had these recommended by them but i could be wrong. Could be the the guy building the engine that told me to get these ones as well. 

Send them back and get a higher cr.

5 hours ago, reallyspeedly said:

Thank you for the reminder about the ballast delete. 

AIT? Do you mean intake air temperature sensor? 

Well, i guess the tuner can tune the TPS 😬

Yes for the air inlet temp and not what I meant for the tune. See here. Some tunas talk a good game but individual throttle body tunes are beyond them. Where abouts in the world are you?

 

 

  • Like 1
3 hours ago, GTSBoy said:

I would prefer being able to stop for fuel anywhere I like rather than the fuel stations with E85 being 15-20km apart.

Hence full flex allows just that, depending on fuel choice your power will vary.

When you feel like a 20 year old fuccboiiii and want to race people on the street or actually go to a race track then fill it up with E85 then top up the tank with 98RON for your commute with whatever ethanol is left.

19 minutes ago, Dose Pipe Sutututu said:

Hence full flex allows just that, depending on fuel choice your power will vary.

When you feel like a 20 year old fuccboiiii and want to race people on the street or actually go to a race track then fill it up with E85 then top up the tank with 98RON for your commute with whatever ethanol is left.

Exactly what I do having the cars on flex, and I live somewhere where E85 has to be drummed up.

3 hours ago, djr81 said:

Yes for the air inlet temp and not what I meant for the tune. See here. Some tunas talk a good game but individual throttle body tunes are beyond them.

True that so many tuners want to try to tune individual throttle RB26s with MAP because they don't understand TPS fuel load and then get poor results.

One of the many reasons I went to Simon at Morpowa as one of the few who I had confidence in to do it on fuel TPS load with the Haltech.

  • Like 1
42 minutes ago, reallyspeedly said:

Is there any good reason for this? It's too late to send them back, the engine is built awhile ago already.

Well if the motor is built then it's built. 

There are many good reasons for higher compression ratio though, more power at all rpm, increased turbo spool, better off boost performance, more low end torque.... I could keep thinking of ways to say "the engine will perform better, everywhere" but you get the idea. 

  • Like 1
5 minutes ago, Murray_Calavera said:

Well if the motor is built then it's built. 

There are many good reasons for higher compression ratio though, more power at all rpm, increased turbo spool, better off boost performance, more low end torque.... I could keep thinking of ways to say "the engine will perform better, everywhere" but you get the idea. 

Yeah, i was sitting here and realise that. Well this car got really shitty.. wrong turbo setup, wrong pistons, ecu, etc etc..

 

i guess i have to ask the engine builder about this, cause for some reason he installed them and this guy is really good with what he's doing. 
 

Edited by reallyspeedly

Turbos are fine, just a bit old school as the hipsters have diluted their gtr purity and gone for singles. They are still good units, however and the blokes with ponytails and beige Volvo dailies can get stuffed.

‘The ecu is a good ecu. You just need a good tuna to tune it. My point wasn’t to put down the setup just to highlight you need someone familiar with rb’s and their idiosyncrasies.

.3:1 isn’t earth shattering on the cr. Certainly nothing E85 won’t compensate for in spades if you go that way.

So yeah don’t get negative about it. It will work fine and be loads of fun. FWIW I’ve got -5 turbos and a Link ecu.

  • Like 1

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

    • The cross sectional area of a circular hole scales with the square of diameter. So a 2mm diameter hole is 4x the area of a 1mm hole. Not double. The 1.7mm hole is nearly 3x the area of a 1mm hole. You do not need restrictors at both ends of the oil supply line. If you have new, additional restrictors at the turbo end, that you did not have before, then you do not need a restrictor at the inlet end.
    • Hi all. Been a while but things are moving along. I just have something that I am wondering about. Since I will use OEM turbo oil pumbing, I got myself a new bolt, the one that goes into the engine block oil feed. As I recall (and see visually) this bolt comes restricted with I think a 1.7mm hole? Not quite sure but it was something around that size. The turbos have 1mm restrictor bolts installed, as necessary due to ball bearings and my higher oil pressures. Can I now just use that OEM bolt with the 1.7mm hole in for the engine block or will this actually be too much oil flow restriction and I have to drill it out first? In my head it would make sense for the bolt to be at least 2mm wide as both turbos take "1mm of oil flow". Do let me know if my logic is flawed here, I just want to make sure I don't kill my turbo bearings with too little oil. Don't know if I can trust the saying I read somewhere that ball bearing turbos essentially only need an oil mist
    • There are several aftermarket options available, from not-too-painful moneyhttps://justjap.com/collections/driveshafts-bearings/products/d-max-reinforced-replacement-rear-driveshaft-set-fits-nissan-s13-s14-s15-r32-r33-r34-c35 and  https://justjap.com/products/crank-motorsport-billet-rear-axles-fits-nissan-skyline-r33-gts-t-r34-gt-t?srsltid=AfmBOorQk4xkGUa98kO7v2ePLUiNt-HRrM2AwWNw9mbSIVE1ujBVwY__, all the way up to The Driveshaft Shop https://driveshaftshop.com/skyline-cv-axles/
    • Yeah based on old XRC5964S specs, it looks to be roughly GTX3576R sized? But this 5964S compressor will flow 90lb airflow somewhat similar to the compressors in both the GTX3584RS or G35-1050.. I fully expected the 0.64 rear A/R to choke up top - seems way too small from typical convention - but these are seemingly beneficial over the prior 0.82 results.. Be interesting to see if he comments on the EFR question in that thread - he mentioned in a prior video that BW EFR's were the "cats pajamas 10 years ago", but by the sounds of things all his kits have been using Xona for quite a while now.
    • Yeah it’s still got the oem manual gearbox and clutch, only kinda mods are a blow off valve, coil overs, and a aftermarket intercooler. Also had it for about 2 months now with a lovely midnight purple paint on it.
×
×
  • Create New...