Jump to content
SAU Community

Recommended Posts

Hi all,

I was wondering what kind of injectors i would need to suit my current setup, my current mods consist of:

BMC Airfilter with Heat Shield

NGK Iridium Plugs

FMIC

Turbosmart E-Boost

3" Exhaust with Dump Pipe and Hi-Flow Cat

Greddy Plenum

Bosch 040 (I think) Intank Pump

My turbo just died and i have purchased a new turbo, it is a RB25 turbo that has a new Ball Bearing T3/T4 Core good for up to 22psi. I know that with my stock injectors and computer i wont be able to run this turbo at its full potential. However i am buying a Power FC and i am buying injectors to.

My Question is, because i have the Greddy plenum i can get a GTR Fuel rail and run top feed injectors, would the 444cc injectors from a GTR be sufficient to run this turbo at full boost or would i need bigger injectors then these again? My aim is as much power as i can get from this current turbo and setup, all help is much appreciated, thanks

Link to comment
https://www.sau.com.au/forums/topic/44394-what-injectors/
Share on other sites

Hi all,  

I was wondering what kind of injectors i would need to suit my current setup, my current mods consist of:

BMC Airfilter with Heat Shield

NGK Iridium Plugs

FMIC

Turbosmart E-Boost

3" Exhaust with Dump Pipe and Hi-Flow Cat

Greddy Plenum

Bosch 040 (I think) Intank Pump

My turbo just died and i have purchased a new turbo, it is a RB25 turbo that has a new Ball Bearing T3/T4 Core good for up to 22psi. I know that with my stock injectors and computer i wont be able to run this turbo at its full potential. However i am buying a Power FC and i am buying injectors to.

My Question is, because i have the Greddy plenum i can get a GTR Fuel rail and run top feed injectors, would the 444cc injectors from a GTR be sufficient to run this turbo at full boost or would i need bigger injectors then these again? My aim is as much power as i can get from this current turbo and setup, all help is much appreciated, thanks

What engine is this?

Link to comment
https://www.sau.com.au/forums/topic/44394-what-injectors/#findComment-907989
Share on other sites

ive been told a good rule of thumb is look at what horsepower you would like to achieve then match them with the same figure injectors. eg 550 hp then get 550cc injectors etc

i was actually discussing this tonight with a friend and this is my theory:

If my 6cyl rb25 flows 550hp of air and need a total of 3300cc of injectors (6cyl x 550cc) will my 4cy sr20 which also flows 550hp of air need a total of 3300cc of injectors? yes. so that means it would need 4 x 825cc injectors (3300cc / 4cyl).

sustained air fuel ratios is what im keeping in mind. i think i am right in what i am saying :s im not too sure so correct me if im wrong :)

Link to comment
https://www.sau.com.au/forums/topic/44394-what-injectors/#findComment-908132
Share on other sites

i was actually discussing this tonight with a friend and this is my theory:

If my 6cyl rb25 flows 550hp of air and need a total of 3300cc of injectors (6cyl x 550cc) will my 4cy sr20 which also flows 550hp of air need a total of 3300cc of injectors? yes. so that means it would need 4 x 825cc injectors (3300cc / 4cyl).

sustained air fuel ratios is what im keeping in mind. i think i am right in what i am saying :s im not too sure so correct me if im wrong ;)

You got it. :)

Link to comment
https://www.sau.com.au/forums/topic/44394-what-injectors/#findComment-908134
Share on other sites

oh sorry, its an RB25DET. Well at this stage i think anything over 300hp at wheels would be nice, i spose the best i can get above that is what im after, if the turbo does 22psi what kind of power will i be able to achieve with the injectors and power fc before the internals become at an unsafe point?

Link to comment
https://www.sau.com.au/forums/topic/44394-what-injectors/#findComment-908164
Share on other sites

oh sorry, its an RB25DET. Well at this stage i think anything over 300hp at wheels would be nice, i spose the best i can get above that is what im after, if the turbo does 22psi what kind of power will i be able to achieve with the injectors and power fc before the internals become at an unsafe point?

Firstly you need to remember that boost is simply a measure of restriction to airflow. It is airlfow itself that makes power, boost is really irrelevant. If you remove the restrictions in your engine, then you can make more power at lower boost. :idea:

Moving on to your question, 300 rwhp is ~225 rwkw and that is pretty much the limit of the standard injectors. RB25DET internals seem to handle ~300 rwkw (400rwhp) as long as the tuning is spot on. There are a number of threads on this subject, you really should do a search. :)

Link to comment
https://www.sau.com.au/forums/topic/44394-what-injectors/#findComment-908184
Share on other sites

one more question, will the standard injectors and computer with that turbo get my 300rwhp?

With this information........

My turbo just died and i have purchased a new turbo, it is a RB25 turbo that has a new Ball Bearing T3/T4 Core good for up to 22psi.

you expect me to be able to tell if the turbo is good for 225 rwkw? :wassup:

Sorry I can't do that, there are at least 20 different combinations of T3 and T4 turbines & covers and compressors & covers. I have no idea which set the turbo builder has used. Since they have gone to the trouble (and expense) of doing a ball bearing hi flow then chances are it is a worthwhile upgrade. My best suggestion would be to find out who did the work and ask them, they should have a record via the turbo serial number. :)

Link to comment
https://www.sau.com.au/forums/topic/44394-what-injectors/#findComment-908435
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

    • Seat of the pants assessment of the new intake: The car is way less "doughy" when hitting the loud pedal, especially off idle when stopped or in traffic, I did use a cheapo lazer thermal thingo to measure the temp around where the pod filter got its air, it was between 55 - 60°C, in saying this the car was shut off and not moving, so the OEM intake pipe was not supplying any fresh air to where the pod was when the car was at least moving A weird bonus was induction noise on the throttle in the cabin increased a bit,  I was worried that I was actually going to lose some of that induction noise I love so much, outside though, when I got the daughter to do a WOT drive by pass for me, the induction noise has increased alot when on the throttle, not quite ITB doort, but well up there I'm extremely happy with the results and have been exploring the country roads in the region  As for house mods: 1.New front fence is up and is awesome, it really upgraded how the joint looks from the street, and the added security is nice 2. Electricians have replace some interior lights, and with more lighting in the garage, a few new motion detecting lights out the front above the garage, front room, and at the front door, which I have already found heaps helpful coming and going, also now has fancy pants CCTV all round the house The only hold point for power though is the solar and batteries due to supply issues, although this will happen over the next few weeks 3. I have done a heap of landscaping out the front and I'm almost ready to do a new small retaining wall with some nice blocks to replace the brick and cemented in rocks around the raised garden beds cemented in river stone "was the fashion at the time" the house was built. I currently have a pallet of retaining wall blocks and 2 bulka bags of 20mm blue metal to replace the wood chip that is in the raised garden beds around the house 4. I now have 3 big raised garden beds for out the back to grow some vegetables, about 70cm high, 200cm long and 100cm wide 5. My 2 compost bins are already pretty full with brown, green and kitchen waste from the landscaping I'vedone so far, but they will probably take a few months to break down, so anything else that gets chopped, trimmed, and kitchen waste will just start filling the base of the raised garden beds to about 30cm before I start throwing 40cm of good compost, and stuff, for the vegetables to grow in, I'll need a few ton of compost and soil, but the local supplier can sent me bulka bags of the stuff Basically the logs, wood chips and a few strategically placed rocks for drainage, will give the beds some good organic materials down low to break down over time, and they will hold moisture during the warmer months to save the water in my big arse water tank if we don't get alot of rain So, all in all, the car and house mods are going well, and I'm really enjoying being retired, I sleep in too 0700 and slowly plod around inside until I feel like actually doing anything, and only work in the yard for as long as want, which has actually been alot over the last few weeks,  although when you look at it, it seems that not a huge amount of work has been done,  until I look at the before I started the work pics Happy days and good times indeed 
    • hahaha yeah. Plan is to get side skirts and probably just rear pods. But going to do them one-by-one. I've got a set that I really like from RHDJapen, but that one isn't shipped to AU. So need to find someone who can get it for me
    • Here's an idea, answer the questions I asked you as they are trying to work out WHY the LSD will be binding up in a straight line.
    • You haven't driven many modern cars then have you? Most of them have sfa steering feel with their stupid electric bullshit steering systems.
×
×
  • Create New...