Jump to content
SAU Community

Recommended Posts

  • Replies 71
  • Created
  • Last Reply

Top Posters In This Topic

"Everybody else" still seems to be Birnie and myself.

I haven't changed any of the corrections, and it's still running just fine.

In the absence of information from any of the experts regarding what latency or lag time actually is, it seems that it is not a critical figure. The correction for flow rates, is.

hah, yeah that's right Dale ! :)

.....although Ben has joined the club too

Just check my settings as i forgot all about it since being tuned by The Hitman,

He has em setup as 72.0 % and +0.10 Latency?? Go figure.

As far as the 72% goes, i guess his full tune would be applied to that setting so i wouldn't advise using that as a temporary figure to get to the tuners......stick with the 82.5..it's a proven working setting, then let the tuner do whatever they want.

PS...The Hitman RULZ !

Any upadate on the latency for the S15 injectors? Is -0.06 the setting everyone else is still using?

Getting my tune tomorrow.

444cc and 0.5 as i posted only a page ago :)

I used the below and put in +0.06 as calculated. Also used the 82.5%. Tune done at MRC Castle Hill. Got a nice 247.4rwkw (18psi peak trailing back to 16psi).

Tough to test in the wet though. Spins from 4000up.

Good tune at a reasonable price.

Thanks Birnie and Dale.

How do I configure larger injectors?

Configuring larger injectors into the PowerFC is quiet simple and takes only a few moments. You need to know the following information before you can continue

Current injector size

Current injector latency

New injector Size

New injector Lag time

Injector Size and Latency (standard units)

Unit Size Latency

RB26 444cc/min 0.772msec

RB25 370cc/min 0.528msec

SR20 (Jap Spec Manual) 448cc/min 0.584msec

Nismo 480cc 480cc/min 1.100msec

Rx7 550cc 550cc/min 0.730msec

Aftermarket New Units 600cc/min 0.810msec

To work out new INJECTOR correction and latency;

Old SIZE / New Size = Correction

New Latency - Old Latency = Latency Correction

John plans to install 600cc injectors into his RB26 VL Turbo. The following figure's are used;

444 / 600 = 0.74 * 100 = 74.0%

0.81 - 0.77 = +0.04 msec

So he would enter 74% for correction and 0.04 as new latency

Once you have switched to larger injectors you should still check your AFR's with a wideband to ensure they are safe and acceptable.

For a list of common OEM injectors and their settings try here;

Injector Chart - Side Feed OEM

Injector Chart - Top Feed OEM

i forgot to ask. When I plug the Hand controller in again (and when it's dry :P) Ill do a few 2nd gear to redline pulls and check the peak.

He didn't say that they were close to maxing out but I reckon they wouldnt have much left.

Edited by benl1981
i forgot to ask. When I plug the Hand controller in again (and when it's dry :P) Ill do a few 2nd gear to redline pulls and check the peak.

He didn't say that they were close to maxing out but I reckon they wouldnt have much left.

best to check duty in higher gears. 2nd doesnt have enough load.

  • 8 months later...

I thought I'd crunch some numbers about RB25DET injectors and larger direct fit replacements to put y'all in the picture .

Std - 370cc , S15 T manual - 450cc , Nizmo 555 and 740cc .

If you divide the std 370 by 450 555 and 740 you get 0.82 , 0.66 , 0.50 .

So I guess this means the S15 Terracotta coloured ones are ~ 18% larger , 555's are 33% larger , 740's are 50% larger .

I ended up buying new Nismo 555's from a member here which I reckon would be fine for my power requirements using PULP , trouble is if you ever decide to use high ethanol fuel blends such as E85 (if it becomes readily available) you need injectors approx 33% larger than you would with PULP to maintain chemically correct AFR's for E85 .

Where that leaves me is line ball (555's vs 370's and PULP vs E85) so in hindsight if I knew then what I know now I would have bought Nismo 740cc injectors .

Nismoid uses/used 740cc Nismo's I believe in an RB25 and had no issues at idle or light loads - on PULP ?

Cheers A .

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...