I believe the stage 4 BNR is a p trim turbine housing (same as if you bought a big T04S 60-1 like I had) but the stage 3 is some kind of smaller (but clipped) wheel.

The whole midrange powerband vs highway pulls is something you have to experience to determine your preferences. Each has its merits. The stock turbo and smaller boltons remind me a lot of an STi-like powerband with the torquey mid range feeling. The big hotside turbos can sometimes make you feel like you are a single turbo Supra owner. You just want to get on the highway and nail it in 3rd.

 

On BNR website, the p trim wheel and porting of the turbine housing to fit the wheel is one of the things they do to the stock turbo.
I wonder if they would port my S5 turbine housing to fit over the wheel so I can install that with my S5 manifold so I dont have to deal with this lag lol

 

I'm working the last couple bugs out of my car, then I'll be starting to tune my RTEKed FC. I think I've read this thread a million times trying to milk as much information from it as possible. Hopefully I can post some logs this weekend...probably do some late late night autobahn pulls.

Are the timing maps that are posted towards the beginning of this thread a good safe place to start as far as timing goes?

 

haha sounds like me ! this thread is very helpful, especially for timing and a general idea of the afr numbers to shoot for.

The timing maps are very good ( in my experience ) actually felt as if i gained a little torque when i first put it in. They are pretty conservative which is good. It will take good amount of time to put the maps in, and you wont always be able to get the exact numbers on the map entered into the rtek.

Shane

 

fuel correction problems

my AFR's where pretty close to being target just a little lean around 5-6k and up. see lat log for reference. i went about adding fuel to the upper part of my map around 3% higher than i had it in those areas. What i got as a result was even more lean than before i figured i might be because the weather was cooler at 58deg. So i added even more fuel and did a pull today at 70deg.... even leaner.

fuel pump not supplying enough pressure ? i dont have a gauge. i ( think ) it has a infinity G35 fuel pump, as i was told by the previous owner. sounds like a walbro 255 and a areomotive regulator are in the plans now? unless it could be something else.

also my odd lean spike grew with the second log. could it be because the secondary's are opening ?

- Shane

 

Do you still have your factory O2 plugged in? I know a few pages back everyone was talking about how the switch from open to closed loop fueling was thought to be the cause and that disconnecting the factory O2 solved the problem.

 

it is a bad o2 sensor, but still plugged up.

anyone else ?

- Shane

 

I did my first half-assed log tonight. I only logged coolant, MAP, and AFR cause for my first shake down run that was really all I was concerned with. I'll log a whole lot more tomorrow.

Here's the link to the post in my build thread with the log: https://www.rx7club.com/showpost.php...4&postcount=65

WB scaling is 0v = 7.35, 5v = 22.39

 

check the fuel pump wiring

 

rewired the fuel pump successfully and ordered a walbro 255. when i get to like 3 psi you can hear the relay click on lol. hopefully this will allow me to fix my lean problem ! i really want to get a tune i feel decent about in the palm before i go down to the dragon again this October.

 

Since I've just been logging and reading, I want to make sure I'm understanding this right. The F-Index RPM and F-Index boost put together is the cell being referenced for fuel at the moment, correct?

 

correct

 

update : installed the walbro 255 pump... no more lean issues ! it was sputtering from all the extra fuel at first but i made some changes to my map and pulled quite a bit of fuel out and did a log today ( 3rd and part of 4th gear ) it didn't choke on the fuel this log and seemed to be running pretty good.

tell me what you guys think ! i noticed that with the extra fuel pressure looks like it is maxing out my primary injectors. Im thinking of lowering the staging rpm, i believe i have the staging at 35** what do you think i should back it down to ?

any insight or opinions appreciated !

analog 2 / wideband is 0v= 10 afr 5v= 20 afr

-Shane

 

I had a fake ebay walbro that had me leaning out at high rpm, installed a walbro 255 high pressure and fixed that issue completely.

With 720 primaries, it shouldnt be maxing out the injectors below the switching point

 

96.99 DC at 3670rpm... Might try lowering secondary staging to 3200-3300 and leaning it out a little bit more in the mid range.

902 Airflow, Nice! What turbo again?...

 

Damn thats some high dc. Havent checked the pdb yet, on the phone.

 

it was at 36** something and i lowered it to 3488 before i did my autox runs, i will have to do another log to see how it looks now. its running rich but pretty good, much more safe now. no more 12.5 afr's coming down the back stretch....

Borgwarner GM8
similar to a T04s i have been told.

 

I was attempting to adjust the starting map the other day and the rtek decided to reset itself back to stock. I hadn't saved my map, so I am taking this opportunity to start from scratch and use a calculated approach instead of just guessing and watching afr's. I wanted to get your opinions on my #'s and plan of attack:

I am using the 550/720 setting and my injectors came back from cleaning flowing 576/708. Just accounting for the variance in flow would lead to a correction factor of approx -4.5% for primary only operation (below 3.3k for me) and +1.7% for secondary only (never happens, but...). Since the primary DC is halved I would imagine that using a correction factor of -2.5% would be appropriate for the >3500 rpm areas. This is all assuming stock fuel pressure of 38psi.

I have actually raised fuel pressure to 43 psi and according to my calculations should use corrections of -9% and -5.5% respectively.

These numbers would only be applied below 6psi and would decrease (inject more fuel) as boost rises. I had previously removed up to 7.5% from the vac/ cruise area of the map (1500-4000 rpm / 24in/hg - 0psi) and noticed a boost in performance. So it seems reasonable that similar settings could improve the positive pressure side of the map as well.

Stock ports, stock turbo, rewired FD fuel pump, areomotive FPR, stock timing (for now...)

 

fuel system

720/1000cc injectors
walbro 255 fuel pump posibly HP ?
stock fuel pressure regulator
rewired fuel pump
to4s sized turbo
8 psi boost

i have Lots of fuel, when i floor it my AEM uego goes to 10 afr and stays there. My fuel table has very little correction in it ( like 3.8 % at 7000 ish rpm ) It looks like im going to have to zero the map out or even go negative to get it running correctly at 8 psi. anyone ever have this problem ? Im guessing i have a hefty fuel system to only be running at 8psi ?

the waste gate has a 8 psi spring it now.
i have a manual boost controller i might use to up the boost to 10-12 psi and also i have a 10 psi spring for the waste gate. should i use the current spring with the boost controller or the 10 psi spring?

Thanks !

- Shane

 

A to4s would be more effecient at around 14 psi. At 14 psi, you would probably have to add fuel instead.
If 10 is the lowest the afr gauge goes, your afr is probably lower. Your fuel setup is overkill for the among of psi you are running

 

He does have a good point, I've ran up to 22 psi on a similar sized turbo with the same fuel and ecu setup, afr's were in the 12's though. But. Better safe than sorry to prevent that detonation.

 

yea i kind of thought that might be the problem, i think i will start at 12psi and see how i can get it to run there. i had it at 8 psi for safety i figured i would try to see if i could get it running good there before i tried my luck at higher levels.

heard you got a bmw, i ran into a few of your buddys when i was at the dragon the past few days.

 

Lol, I thought that was you in those pictures, digging the wheels man. Ya got me an 04' M3, been lovin it so far.

 

Wow this thread is awesome. I came across it while looking for an NA S5/RTEK 2.0 thread and I got sucked in (just got done reading the whole thing from beginning to end my eyes are JACKED right now lol!). Been out of the rotary scene for a while and now im looking to get into another S5 to tune & use as a daily. Does anyone know of a thread this good for an S5 NA/RTEK 2.0 set up? Im lookin' through every thread in this section right now, but if someone can drop me a hint thatd be appreciated, thanks!

 

Rebuilt turbo. 14psi soon. Logs & vids to come.