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a_florida_man
a_florida_man GRM+ Memberand Dork
9/22/24 8:58 p.m.

Short term plan.

Oil Change - the oil is probably 5w-? right now and it's too thin for Florida.

(Nissan Agrees)

Going to oil change up to 10w40.

Also there are some driveability issues. 

Occasional poor idle, LOTS of soot on the exhaust.. etc..

In that department, we dont have data stream access yet, and it hasn't gotten so bad as to throw a code. 

But it is OBD I , and it would have to be pretty bad to trip that threshold with OBD I in my experience.

So I thought the first order of business would be to pull the air cleaner and clean the MAF.

The air filter is not happy.

 

I did not need to be deformed to install it.

It is nestled in the front grille, I don't see where anything hit it.

For as wonky as it looks, its still rather stiff.

I see a stud on the outside end... did that need to be anchored to something to provide rigidity?

Vacuum situations can generate a lot of force.... I learned that the hard way when I modded my SLK challenge car.

It ran really well... all the time with the intake collapsed... lol

In any case since we have the OEM air box, we are going to clean the MAF and reinstall with the air box.

At least long enough for a baseline on performance.

 

While scoping it all out... I found where a rodent chewed on ONE of the fan blades.... sheesh... probably replace that and eliminate the fan rumble that is a little distracting inside the car.

Probably the ONLY fasteners ive found on the car that have any rust. We have a program for that too,

​​​​​​

 

Mr_Asa
Mr_Asa MegaDork
9/22/24 10:13 p.m.
stafford1500 said:

Time to fire up the computer and 3d printer. That latch/bracket looks like a good modeling project.

I know that our new member, Jehannum, has had several doodads 3D printed, and has had stuff sent to him by the Z community. This may be fixed already, just need to get the file 

a_florida_man
a_florida_man GRM+ Memberand Dork
9/22/24 11:19 p.m.

Interestingly enough, while reading different things this evening I have found two interesting threads...

1. The air intake that I removed is notorious for causing low speed and highway speed drive ability problems. Issues mainly surround MAF calibration to intake turbulence and MAF contamination. So we are likely headed in the right direction there.

2. these cars commonly suffer from rear main seal leaks due to clogged crankcase pressure valves and clogged PCV hose restrictors. Since they are pretty hard to get to, they rarely get cleaned or replaced. Definitely going to have to look into that before we pull the transmission.

3. Sooner or later we will be pulling the transmission... lol... the 5 to 4 downshift issue is primarily early synchro failure. Folks recommend redline gear oil, but thats just a band aid. It causes a friction change that will briefly make the synchros a little more effective. But thats ok, Jack needs to learn how to double clutch anyway, right?

a_florida_man
a_florida_man GRM+ Memberand Dork
9/22/24 11:21 p.m.
Mr_Asa said:
stafford1500 said:

Time to fire up the computer and 3d printer. That latch/bracket looks like a good modeling project.

I know that our new member, Jehannum, has had several doodads 3D printed, and has had stuff sent to him by the Z community. This may be fixed already, just need to get the file 

Yeah, he's running a pretty cool thread right now on his ownership history. I reached out on the subject of OBD I data stream access options. I hope he stops by.

Jehannum
Jehannum New Reader
9/23/24 3:32 p.m.
a_florida_man said:
Mr_Asa said:
stafford1500 said:

Time to fire up the computer and 3d printer. That latch/bracket looks like a good modeling project.

I know that our new member, Jehannum, has had several doodads 3D printed, and has had stuff sent to him by the Z community. This may be fixed already, just need to get the file 

Yeah, he's running a pretty cool thread right now on his ownership history. I reached out on the subject of OBD I data stream access options. I hope he stops by.

I've done a thing or three for Z32s wrt 3D printing, and they're all available for free here:

https://www.thingiverse.com/gcdanie/designs

Jehannum
Jehannum New Reader
9/23/24 5:37 p.m.

WRT to your long post above, I have a long post of my own!

I run Rotella 5w40 in Albuquerque, NM, but I only have 30k on the bottom end.  Be aware the oil pressure gauge on these cars is fictional, just like the boost/vac gauge and coolant temp gauge.

The typical thing to do with the stud on the end of the air filter is to make a hole on the back of the splash shield (which should spare you the buffetting nonsense that people run into with cone filters).  Alternately, you can do the "flower pot mod", where you cut a loose-ish fitting plastic flower pot from Home Depot in two (saving the entire bottom), put the shield side down, and the open side toward the nose panel.  The soot with a JWT tune is normal.  When you look at the AFR table in how ever you decide to view it, you'll see that, pretty much as soon as the loads indicate boost, it heads straight to 10.5:1.  JWT also bypasses the stock 4-map setup (an AFR table for: regular operation gears 1-4, knock detected operation gears 1-4, regular operation gear 5, and knock detected operation gear 5) and just duplicates the table 4x over.  It's not great, but for chip tuning, it's close to as good as you're going to get.  You can get by altering the k and take-off parameters for bigger fuel injectors, but eventually you'll want to go full standalone (Maxx, Link, ECUMaster, etc), or "sorta-standalone" (nistune).

In terms of poor idle quality, there are a few ways to approach it.  

First, a power balance test, where you unplug one coil at a time until you find the cylinder that's being dicky.  Then swap the coil from that cylinder to a different cylinder and see if the misfire follows.  

Second, it's a MAF car, so supremely sensitive to vacuum leaks, and there is about 40 feet of linear tube with numerous joints that can/will leak with age.  The soft rubber junction between the two intake tracts (where that single filter and MAF hang off of) is the right size for a 3" PVC pipe cap with the threads sanded off, and a quick-connect air fitting put in.  That'll allow you to pressurize the intake (stick with 5-8PSI) and find any leaks up to the throttlebodies.  

Third, you need to check the vacuum system behind the throttlebodies.  It's a mess.  An '89-'92 will have AIVs (an air valve to light the cats off at startup), '93+ don't have those.  The balance tube (the black set of pipes that join the two banks on the back of the plenum) is O-ringed, and the usual replacement job people do ends up with O-rings that are way too thick, so get a set of OE Nissan ones then measure them and use those measurements to replace them down the line.  The rest of it is pretty much the same as this diagram:

The usual way is applicable here - unplug each vacuum line from the source, hook it up to your handheld vacuum pump, and see how long it takes to bleed down after a couple pumps.  Also, put a catch container between the FPR and the fuel damper and your pump, because the diaphragms in them is known to degrade when fed ethanol oxygenated fuels.  Not in that diagram are the brake and clutch master cylinder boosters (yeah, the clutch has vacuum assist, no, it's not very good).

Eventually, you want to simplify the whole thing so that it looks more like this:

If you're feeling particularly froggy, you can dump the FPR and damper for a larger diaphragm FPR.  I used a Tomei Type L.  The usual way people find out the stock units are bad is discovering that the vacuum system has started sucking raw fuel down the balance tube through the ripped diaphragms.

Finally, '89-'94 use pintle-style fuel injectors that aren't very well sealed, and tend to corrode away until they just stop working.  You can check operation by checking resistance on each solenoid coil (they should all be 12-14 ohms).  If you want to stick with the side-feed injectors, convert to the later model's pintle-less fuel injectors, and get the adapter kit.  These don't fail.  I like doing business with AUS Injection for rebuilt fuel injectors.  They also sell some pretty high-flow stuff if you start to go down that path.  Keep in mind, JWT tunes all run the stock 370CC/min injectors up to about 95% duty cycle.

Useful links:

FSM

Z32 Wiki at CZP

I can't get to it, but Damon's tutorials at twinturbo.net (in the tech section) are invaluable.

a_florida_man
a_florida_man GRM+ Memberand Dork
9/23/24 6:42 p.m.

In reply to Jehannum :

Thanks for all of the information.

I spent the day today recovering from Covid. It might be a while until we get a chance to fully digest everything and take any action, so I wanted to be sure to thank you first in the interim for your responses here and in your thread.

a_florida_man
a_florida_man GRM+ Memberand Dork
9/23/24 6:46 p.m.

Love this stuff... compare to the previous photo less than 24 hrs ago.

a_florida_man
a_florida_man GRM+ Memberand Dork
9/23/24 7:07 p.m.

One more post....

This is the inlet side of the maf, as removed from the cone filter.

I wiped my finger across the inlet screen to show how dirty it is. I would not expect it to get this dirty.... thoughts?

Anyway.... Jack's next lesson Maf purpose, hot wire maf theory and the importance of keeping it clean but only with the correct cleaner.

 

Jehannum
Jehannum New Reader
9/23/24 8:18 p.m.

Look at these sweet, sweet ancient tools for dealing with EPROMs, lol.  The writer takes a parallel port!  I think I've used it a time or two with a USB adapter, but it's just a bit-banger.

I'll keep digging for the Consult interface.

Jehannum
Jehannum New Reader
9/23/24 8:21 p.m.
a_florida_man said:

One more post....

This is the inlet side of the maf, as removed from the cone filter.

I wiped my finger across the inlet screen to show how dirty it is. I would not expect it to get this dirty.... thoughts?

Anyway.... Jack's next lesson Maf purpose, hot wire maf theory and the importance of keeping it clean but only with the correct cleaner.

 

If you've been running the filter with no oil, then it's not doing a lot of filtering.

a_florida_man
a_florida_man GRM+ Memberand Dork
9/23/24 8:26 p.m.

I just got the car last week... not sure how long it was run with the filter as I recieved it. The filter did appear to be a little on the dry side.

a_florida_man
a_florida_man GRM+ Memberand Dork
9/23/24 8:34 p.m.
Jehannum said:

Look at these sweet, sweet ancient tools for dealing with EPROMs, lol.  The writer takes a parallel port!  I think I've used it a time or two with a USB adapter, but it's just a bit-banger.

I'll keep digging for the Consult interface.

Ah yes... its been a while since I even thought about remembering the last time I messed with EPROMs. Flashable ROMs are a long forsaken  luxury....

Does anyone make a flashable / piggyback type ROM for the E32 ECU?

Jehannum
Jehannum New Reader
9/23/24 8:41 p.m.
a_florida_man said:
Jehannum said:

Look at these sweet, sweet ancient tools for dealing with EPROMs, lol.  The writer takes a parallel port!  I think I've used it a time or two with a USB adapter, but it's just a bit-banger.

I'll keep digging for the Consult interface.

Ah yes... its been a while since I even thought about remembering the last time I messed with EPROMs. Flashable ROMs are a long forsaken  luxury....

Does anyone make a flashable / piggyback type ROM for the E32 ECU?

The only other option I'm aware of is straight up emulation (old school Moates Ostrich), but there isn't any really good option for realtime tracing, unless you enjoy reading hex.

But maybe I'm wrong, and one of the new programs like Nissan Data Scan will do it.

You can use a 27sf512 and write the same program to the lower and upper addresses (or figure out a way to ground or pull up the floating address pin and then only write it to one register).

Mr_Asa
Mr_Asa MegaDork
9/23/24 9:02 p.m.

I forgot those damned feet.

They're like Angry's Devil Horns

a_florida_man
a_florida_man GRM+ Memberand Dork
9/23/24 9:13 p.m.
Mr_Asa said:

I forgot those damned feet.

They're like Angry's Devil Horns

Ok, not a post I expected.

There is some history here?

Mr_Asa
Mr_Asa MegaDork
9/23/24 9:29 p.m.
a_florida_man said:
Mr_Asa said:

I forgot those damned feet.

They're like Angry's Devil Horns

Ok, not a post I expected.

There is some history here?

I just know him from another forum.  His feet are always visible.

 

ALWAYS.

a_florida_man
a_florida_man GRM+ Memberand Dork
9/23/24 9:40 p.m.
Mr_Asa said:
a_florida_man said:
Mr_Asa said:

I forgot those damned feet.

They're like Angry's Devil Horns

Ok, not a post I expected.

There is some history here?

I just know him from another forum.  His feet are always visible.

 

ALWAYS.

Like a parallel universe Stampie?

tb
tb Dork
9/24/24 8:33 a.m.

In reply to a_florida_man :

I definitely don't remember the filter looking like that when I installed it! I don't really remember smashing into a neighborhood pet or child, but i might have...

 

Good thing you guys saved this from that PO, she shows some signs of neglect

a_florida_man
a_florida_man GRM+ Memberand Dork
9/24/24 9:49 a.m.

In reply to tb :

Probably not neglect as much as possibly a wet filter from a rainstorm or puddle... that can give the vacuum a lot of leverage by clogging the filter and simultaneously weakening it.

Jehannum
Jehannum New Reader
9/24/24 9:50 a.m.
Mr_Asa said:
a_florida_man said:
Mr_Asa said:

I forgot those damned feet.

They're like Angry's Devil Horns

Ok, not a post I expected.

There is some history here?

I just know him from another forum.  His feet are always visible.

 

ALWAYS.

I don't think people here are ready for my calendar pictures yet, so the feet shall remain :p

a_florida_man
a_florida_man GRM+ Memberand Dork
9/24/24 9:53 a.m.

Complicated older collector cars, luxury or sports, are needful things. Possessing them comes with a fantastically high  commitment.

peanutpckrupper
peanutpckrupper Reader
9/24/24 10:23 a.m.
a_florida_man said:

Ah yes... its been a while since I even thought about remembering the last time I messed with EPROMs. Flashable ROMs are a long forsaken  luxury....

Does anyone make a flashable / piggyback type ROM for the E32 ECU?

Nistune does. I used one of their boards on my Skyline it was great. 

Jehannum
Jehannum New Reader
9/24/24 10:58 a.m.
peanutpckrupper said:
a_florida_man said:

Ah yes... its been a while since I even thought about remembering the last time I messed with EPROMs. Flashable ROMs are a long forsaken  luxury....

Does anyone make a flashable / piggyback type ROM for the E32 ECU?

Nistune does. I used one of their boards on my Skyline it was great. 

Nistune used to be basically an emulator, but it's graduated well beyond that now.  

It's still something I see as a stepping stone between a chip tune and a full up standalone.

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