Z does not accelerate

Vicster

Woooooow

All the more reason to get some catch cans installed soon...

Which cans are you running?

__________________
-Chris

'13 Z34 Touring Sport | ARK GRiP CBE | Stillen G3 CAI | AAM HFC | UpRev | 20mm Z1 Spacers | StopTech Drilled/Slotted Rotors | StopTech SS Lines

RBfastback

twin saikou michi catch tanks I had them custom sized to fit exactly how I wanted them. if anyone wants the dimensions I have them saved and the owner will remember my build if u call or email him an mention me lol


only thing I gotta do now is rout the lines under the gen 3 pipes to look cleaner

Vicster

Very nice! I'll PM you for the information, or you can post it here if you care to.

__________________
-Chris

'13 Z34 Touring Sport | ARK GRiP CBE | Stillen G3 CAI | AAM HFC | UpRev | 20mm Z1 Spacers | StopTech Drilled/Slotted Rotors | StopTech SS Lines

RBfastback

I emailed him to see if he could make it an option,
but this is what I originally emailed him.
RIGHT:
-s1 350z occ (modified S1 SPLIT DC3)
(no 350z reservoir adapter, just regular L attachment that comes with s1 occ)
-glossy red
-black sticker
-2.5 diameter x 5" tall
-overall tall 7 1/2 (s1 350z cad dimensions)
-mounting location 12:00 and 1/2 from top edge
-inlet valve on top 1" over top of tank edge(like on 350z cad dimensions)
-sight tube, location at 9:00
-nipple style
-connection size 3/8
-inlet/outlet location at 10:00
-drain option D kit
extension with
1/4 turn ball valve low
also a 1/4 ball valve high

(I wanted 2 on each can one high and one low)

-------------------
LEFT:
s1 350z occ (modified S1 SPLIT DC3)
(no 350z reservoir adapter, just regular L attachment that comes with s1 occ)
-glossy red
-black sticker
-2.5 diameter x 5" tall
-overall tall 7 1/2 (s1 350z cad dimensions)
-mounting location 12:00 and 1/2" from top edge
-inlet valve on top 1" over top of tank edge(like on 350z cad dimensions)
-sight tube, location at 3:00
-nipple style
-connection size 3/8
-inlet/outlet location at 2:00
-drain option D kit
extension with
1/4 turn ball valve low
also a 1/4 ball valve high

(I wanted 2 on each can one high and one low)
-----------------
I also need this stuff:

-9" foot of:
HS-375-SAE 3/8" ID black SAE 30R7 hose
-8 #4 worm gear hose clamps for 3/8 hose


this is where I will be mounting them to the stock airbox tab

(left an right white circular tabs)

like in this persons DIY: DIY: Dual Oil Catch Cans 370Z
this is where I got the idea, I just want my dimensions a little different then his.

here is the drawling

RBfastback

except the sketch doesn't have the 2nd 1/4 turn ball valve cuz I added that later only because I didn't want the oil sitting in the lover ind of the hose. I wanted it in the catch can so it gives me the option to open 1 or both ball valves. also to utilize the sight tube for oil hight in the can

RBfastback

he just sent me this email back:
Oh hey!

Sounds awesome! They can just say it's the OCC pair for the 370z. It is now the S1-370Z-D dual setup.
They can add the Sight Tubes and or Drain Extensions if they like, but those are normal options.

Thanks !!!
-------
so just email him from his site
http://www.saikoumichi.com

juld0zer

throttle bodies eh?
That's a bit scary isn't it? DBW engine with two throttle bodies that cant tell the ECU they are shut when they shouldn't be? I guess it's better than wide open but ecu
thinking they're not!

Did your cars log any codes? How was it finally determined that the throttle bodies were at issue? I mean, what is the root cause or the actual faulty component in the TB?

Vicster

Not exactly...

Yes, there were codes and the codes were MAF related. The throttle bodies are not really the issue. It's the buildup in the throttle bodies that cause the problems. As a couple in this thread mentioned doing, cleaning the throttle bodies also works to fix this issue. So what's the root cause? Probably a few things but we're leaning towards a combination of oil output from the PCV and oil/junk from the filters.

So what's the problem with the ECU? And as you stated, why can't the ECU tell they are shut when they shouldn't be? Well, this is my take on it: The ECU does see that there is a problem but not with the TBs. When the car is started and begins to idle the ECU sees two non equal outputs from the MAFs from each intake bank. It begins to prefail the MAF sensor that appears to be reporting a non-normal idle air flow based on how much air should be allowed through a closed TB. It also decides to put the car into a limited power mode at this point (though this part is odd and doesn't seem to happen all the time during the prefail but is consistent once the CEL is on and the code is fully thrown) as I would imagine it is trying to prevent damage to the engine with different intake levels to the manifold. Eventually the code is fully failed and CEL comes on. So why? I suppose the ECU is programmed to think a sensor has failed before the TB, which sorta makes sense to me.

So, is there a fault component in the TB? No. Plain and simple, no. It's just that Nissan doesn't have a clean up procedure for this issue and just replaces the entire throttle body - which is somewhat normal in this industry these days.

This is basically why the next step for me is to get a good set of catch cans and to not use oiled filters anymore. Plenty of good dry filters (even in some of the nicer CAIs such as the Stillen)...

__________________
-Chris

'13 Z34 Touring Sport | ARK GRiP CBE | Stillen G3 CAI | AAM HFC | UpRev | 20mm Z1 Spacers | StopTech Drilled/Slotted Rotors | StopTech SS Lines

RBfastback

juldOzer:

for me leading up to it the only problems I had were the random limp mode/throttle lag and a feeling like my car was not as quick to respond an even a slight sluggish feeling too.
then one day it just completely stopped and I got the only code was p0113, bad IAT sensor.
nissan said its only certain throttle body's that have the problem so changing it out for a new one will get rid of the problem for good.
here's the work order receipt:



after the replaced it it feels like a got a tune again, more responsive and haven't had an issue since

carlitos_370z

great dude!

juld0zer

Seems odd. These are low mileage cars yeah?
I cleaned mine at approx 60000km (cant remember exact mileage before i sold it) and the amount of gunk on there was negligible. It was mostly just condensed oil vapour & came off easily with carby cleaner & some light wiping.
The worst was on the edge of the flap and where it rests in the throat. This is where the crusted carbon was.

After cleaning & performing the required resets/relearns, idle was very stable 650 +/- 30rpm. I had the Stillen intake for most of that 60k km. Idle TPS as per my scangauge became 1 degree instead of 3-4. You guys make me want to dig up my Uprev logs and compare the air flow across both banks - but my laptop with the data on it had died.

Vicster, good explanation and it's plausible. I should've taken off my intake piping to see the throttle body behaviour under various conditions before i sold the car. To this day, i'm still not convinced the TPS readout via OBD2 is a pseudo-throttle position like some people have explained on various forums. My Uprev logs suggested that the throttle bodies did behave like the TPS readout indicated.
So i guess the question is: despite VVEL, do the throttle bodies still play a primary role in air throttling? The official stuff from Nissan tells me the throttle bodies on VVEL engines are wide open most of the time.... which is contrary to my logs.

Then there's the Uprev throttle map tweaks which seem to directly influence throttle body behaviour, rather than VVEL behaviour. To me, the throttle bodies still have greatest control over air throttling on our engines.

Vicster

Interesting point...

Yeah, much of what I wrote is speculation based on what we have gathered and the very little detail from Nissan.

Also, My car has ~54k on it and this started escalating slowing after about 35k. So maybe you are right; combination of things going on? Who knows... The one thing I do know for sure is that the tech that did all the work on my car said the TB's were VERY bad. He cleaned them up a lot and said they probably would have been fine but was told to replace them by Nissan anyway.

So far, my car is significantly better. Due for an oil change here very soon so I should be able to tell if some of the sluggishness is just from the oil. Though I can say, as time has gone on I feel like the car has gotten slightly more responsive.

__________________
-Chris

'13 Z34 Touring Sport | ARK GRiP CBE | Stillen G3 CAI | AAM HFC | UpRev | 20mm Z1 Spacers | StopTech Drilled/Slotted Rotors | StopTech SS Lines

FrostyNaples

What dealer did the TB replacements?

I'm thinking of checking mine into Naples Nissan soon.

I have a '13 7AT w/ approx 16,000 miles, and i'm now getting the random limp mode while driving, however, the only times I can say for certain this happens is when I start the car (parked), turn on the A/C, and then begin to drive.

I have not experienced limp mode with the A/C off, unless limp was already engaged (turning the A/C off after i notice it, does not correct the problem).

Problem only goes away after turning the car off, and right back on (keeping A/C off the 2nd time).

On my way into work this morning, while driving, i engaged the A/C to see if it was an immediate trigger to limp mode, it did not, the power was fine.

This is so bizarre. I do have a Bluetooth OBDII dongle I can try to see if there are any codes this weekend, there are no lights triggered currently.

__________________
2013 Pearl White (Base) 7A - DD

RBfastback

I took it to Naples nissan, they were real nice and had no problem replacing it (only driver side)

but u gotta remember my car wouldn't run, just start then stall out right away

but before it wouldn't start an it was just the limp mode problem the only way to fix it was also to turn my car off an on.

FrostyNaples

Ok good to know, this is where I purchased the car from, glad they didn't try to blame any mods.

I have the Z1 tubes only under the hood, i see you have CAI's.

So i'm going to try to get any codes first, I hate bringing the car in without any ammo if you know what I mean.

__________________
2013 Pearl White (Base) 7A - DD