Jump to content
SAU Community

Recommended Posts

i just had my car tuned today and i was a little disappointed with its power figure

it has:

Unopened RB26

Power FC

RB20 AFM x2

Garrett 2860-5 x2

100mm front mount

adj cam sprockets (both)

bosch 044

sard 700cc inj

nismo fpr

CES dump pipes + 3' exhaust

Greddy Profec b spec 2

and it made 375rwhp at 16psi (about 280rwkw)

the tuner said the profec control unit shat itself, hence the single boost level, even tho it is brand new? WTF?

shouldn't these turbos put me around 325-375rwkw (433-500rwhp)???

i'm suspecting that the weakest link is the Afm's, but they should be able to handle more power than that

because i suspect that higher boost alone won't get me to my target power.

can someone offer some opinions on the matter?

other wise the only

Link to comment
https://www.sau.com.au/forums/topic/286087-rb26-2860-5-power-figure/
Share on other sites

he mentioned that this power figure was exactly what he was expecting.

was tuned at brisbane tuning and turbo, and he said after the first hundred GTR's he's tuned, it took the guess work out of the cam gears.

the exhaust is quiet, so that could be an insight.

reading thru the RB26 guide, there are a few cars around this power level with the same turbo's, boost, etc, but this level just doesn't sit well with me

cheers!

anyone else have any ideas?

so much was changed on the car at once

it could be anything

check the basics

ask the mechanic

ask another mechanic

check the dyno chart

check basic engine health and setup - base timing, basic sensors, base compression, base boost check etc

Just curious why you're using that Nismo FPR with the sard 700s, the injectors should be able to support 400kw no problem?

As for power loss, very strange, maybe the timing belt just jumped a tooth.. and what position was/is the CAS set to (the CAS thing shouldnt be an issue if the tuner was familiar with skylines)?

Seem's normal for the boost, slap it on another dyno and you might jump up on the figures. Also, what sort of tune has he done. If it's a stock 26 which is 15 years old that might have to be considered. What the other dudes mentioned might provide some better insight. If it drives well and feels better you should be sweet.

Edited by monga

could be a very tired motor?

i got 214 rwkw out of my RB26 with -5's and running 14psi on stock (ECU, Fuel pump and injectors) with only a full exhaust and pods.

then i had the motor rebuild and now am getting 250rwkw @ 13psi with the same bolt on's, just have had forged pistons put in, full race bearings, R33 crank, head has been recond, block bored, honed and hot washed.

so really it just came down to the fact that the car needed a little bit of a freshen up after 20 years

Brezza

Hey dude, I've got a 1993 R32 that i get tuned at John's, been going to him for a bit now and i think he's always been a straight up guy. He has done a lot of RB's, including his own 240Z conversion putting out 530rwhp with some custom turbos that i've also got on mine. I run a very similar setup to you (plus rebuild) but same afm's and pfc, so if you wanted to swap the afm's over to see if that makes a difference let me know. Can also pressure check you're inlet system for leaks (i found a few after upping the boost). i'm in Brissy (coorparoo) 0403 486 876 if you're interested

Andrew

Seems about right for 16psi through stock cams to me. stick some 260 degree cams and 18-20psi through, and add 100 to that number.

Seems about right, i had HKS 2530s and couldnt get any higher boost then 1.2bar (18psi)

Needed cams, bought tomei 260/260 and made a lot more power and no more boosting problems.. However, im not using RB20 afms, using z32s.

Cheers,

Gordon

You can add 100rwkw on stock cams as well and to make 380rwkw no drama's. Not required.

U'd need at least 22psi and a very aggressive tune to get that on stock cams IMO. Much better to have cams matched to the turbos rather than tryin to push the envelope of one and not the other.

well i'm going to powercruise next weekend, so i'll check it out on their dyno (but is usually really hot there)

i'm looking at a open exhaust for the event and i'll try to turn up the boost a little. hopefully that should give me an idea.

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

    • Thanks mate for that reply. Very helpful.    it’s a 2022 400R so would most likely lose those features as you say.     I did a quick compare of a rv37 nav and heading for sale in Japan to q50 model. I’ll pop pics below. Seems  Japan spec head into top, nav unit second below it   below pic Q50 aud delivered     differences seem to be Aus delivered has a different plug top left hand side of head unit- not sure what and where it goes.   and nav unit Japanese tv37 had an extra plug put    Again I’m really not sure what each of these differences mean!       the actual plugs on a v37 and q50 screens look identical on both screens… pics below for comparing. (One screen was is a us delivered one) but should be same gps signals etc as Australia.    If it were as simple as swapping a nav unit from q50 aud delivered im interested -just want to figure out what the missing plug is for before spending big $ on a second hand part for it to not work, and I guess with the head unit, if the band expander does the job (I got a 20mHz so should get the range I’m after) so should narrow my issue down to nav unit only.  I’d love to know what the extra cable on rv37 does and if I elongate that part what it’ll do to the setup,    and also, if I can figure out what that head unit plug difference is, what does that cable do and where does it got can it be altered or re-plugged?! Excuse my ignorance what is ACP/AA, what does that stand for?   Thanks for the info re tyre sensors, helpful and great to know.  I was reading the online manual off Japan website and it seemed to make it sound more confusing than it is  I guess a rim replacement would require the sensors to be moved to a new rim to carry that option over?!     Thanks for the info regarding diagnostic mode. I appreciate your help mate. Trying to brainstorm here to find a solution to get as much gadgets as I can working! I plan to get my local Nissan tech to have a look too who used to be at an Infiniti dealer back in the day to see if any thing they have or idea can find a soliton. But hoping anyone here has gone down the same route to make life easier!!   i guess identifying the cable/plug differences and what they do would be a great way of finding out if the units are transferable    thanks again 
    • No idea about the remote start part. If the V37 nav is anything like other Nissan JDM vehicles, you can't get the factory Japanese nav working in australia, a card from a different car almost certainly won't work, those cards are usually matched to the serial number of the DCU.  You could be possibly swap out the components from a AuDM Q50 to get it working, but if this is a new model (2021+) 400R, then you will lose the newer features like ACP/AA.  That said, if you have ACP/AA, just use google maps.. I assume a band expander would be required to get the local radio stations, but don't forget the Japanese FM band is narrower than ours, so you still might not be able to receive all Australian stations. I can't see any reason the tyre pressure sensors won't work here, there is the sensor unit inside the rim and the receiver nearby in the wheel well.  I have never had to change the batteries on my 2015 Q50, so I assume they last quite a while.  A straight battery change shouldn't need them to be re-registered as they are the same unit, that should only be required if you replace a sensor with a new one.   Word of warning, if you ever go into the 'secret' diagnostics mode on the main screen, DO NOT EVER do a 'reset' in this menu, it will erase all of your model specific data in the DCU and you will need a trip to a dealer to re-program it all, which would be particularly painful being an import.  This applies to the AuDM Q50 too.
    • There is a known issue with the mix door motor on the Q50 which causes these symptoms, not sure if it is common on the Y51 though.
    • That ring thing is interesting how it's holding everything together 
    • Hey guys. I have a 400R on its way to Australia from Japan currently and have a few questions I’m hoping others may be able to help with.   Wondering if anyone here has had any luck getting the Sat nav unit to work in Australia!? Assuming the Stereo is as simple as a band expanded and tv won’t work?  Seeing as they’re based off a Q50 which is Aus delivered is there any way to link that system to the nav? Nav modules and head unit are different part numbers and appear slightly different at the rear with plug ins etc. can I put my xtrail sd card into the rv37 and will that convert the maps or update to Australian? Has anyone got any advice here?     also has anyone fitted the factory remote start and Security system once it’s landed in Australia? I put an enquirey to Nissan Japan in via a third party, and they suggested it needs a Nissan Japan dealers device to setup and couldn’t guarantee if one here could do it or not. They can supply and I can physically fit it but to setup I would need a dealers device. Any information here would be appreciated also. I’ve seen one here with it fitted already prior to leaving Japan at a dealer/inporter, so clearly passes compliance and works when fitted Japan and doesn’t need changing here.      also, does the tyre inflation sensors work here? Does anything change with them when the vehicle arrives? Where are they actually situated? I’ve read they have batteries and they need to changing at times and seems like resetting involves the nav system?    any help here would be appreciated and any other aust specific information to help would be great. Looking forward to see what the current generation skyline is like and eager to see how many of the gadgets can be utilised here.  Thanks in advance 
×
×
  • Create New...