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stupid_fast

simplicity and reliability, ZX turbo track toy

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Posted (edited)

 

The steering rack issue ended up just being a small installation oversight due to the way I put the center seal in, I had pushed it over the gear and it cut the seal.

I assembled the rack from the other side of the main shaft and was able to get everything to seal up no problem. 
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After a proper alignment on a nice dug-in rack and a new set of tires, I was ready to head to my next event at jackson county sports park in Medford Oregon. 

Dropped the cars off at the track, and went back to town to spend the night.
We arrived at the track in the morning, attended the drivers meeting and I ended up being the first one on track, drove for a few laps and started getting comfortable and BAM!  Stripped out 3rd gear on the initiation into the first corner. 
 

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This is was a late KA / SR larger gearset. (there are two gearsets for the KA with the same ratios)

 

I pulled the gearbox at the track, cleaned up the bits and resealed it and dropped it back in to drive home.
A waste of a track day, but at least I got home without a tow. 

 

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Luckily I have a spare gear set on the shelf, so all will be fixed soon. 
 

The blown gearbox being pulled apart.


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Here's my spare big gearset vs another early KA box I got.  The big gearset is about 2mm bigger on each gear.   

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The state of my new garage is bad as well, so lots of things need to be addressed before this thing will be back out. 

Edited by stupid_fast

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Posted (edited)

This is likely my favorite current build thread, really enjoying the deep dives into everything from gearboxes to ECU definition files. Your pragmatism and ingenuity are fun to watch. Keep up the good work and keep sending it. :trippen:

Edited by Leon

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Leon,  Thanks!  Its nice to know someone finds my ramblings entertaining.  

I'll  do my best to keep this updated as things progress with the car.
Although I have all the parts, I'm taking my time rebuilding the gearbox for now as there's several tech discussions I need to go back and read. 



On another topic, i just ran another lemons race in my friends E36 on the Thunderhill 5 mile.  I really want to get my z on that track and make it set some respectable lap times. 

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Great thread and keep it coming!  I went to my first drift event, Lone Star Drift this past Saturday with my 16 yo son.  We had a great time.  I was surprised how many Zs were there.  There were mostly 350z, but there were a few S130 and Z31s in the mix. 

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Posted (edited)

Thanks Rossman, drifting is fun but the scene here is annoying me. 

There are a few Z's drifting out here as well, but they're not great cars for it. 

Here's a bit more details on the gearbox I blew up.

The annoying part of all this is that I replaced the T5 since it was known to strip out gears!

The S13 box was rebuilt before I installed it in 2016.  It received fresh bearings, synchros and clearances checked to FSM spec. 
I also blocked off the oil passages in the sandwich plate (jb weld held fine for this) , and relocated the rear bearing oil scraper to 5th instead of on 1st to reduce oil transfer to the back of the box.
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Note, there were also two main shafts available. 
The top one has a larger diameter, and longer splines on the output shaft.
I threw away the larger one, the output splines were twisted so I decided it was unsafe to use.

 

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Another topic from mid 2017,
The turbo CV ends I had were worn out and making very loud horrible noises.

They never completely failed, but the noise was unbearable for driving the car any significant distance. 
As the axles were over $700 each from Nissan, and rare to find used I needed to find a better solution.
 

These were toast!  My other pair were just as loud, even though they still had plenty of grease in them.

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So what's the solution?

Most nissan CV axles used the same spline through the 80s and 90s. 

The 300zx CV joints aren't an option anymore, as they're either expensive from nissan or not available in the aftermarket. 

 

I looked at the Infiniti M30 based on a single comment I found here on hybridz.  It has an R200 long nose with the same differential spline, and suspension similar in design to the z31.
Its also a newer model, and it only came with an NA VG30e and automatic transmissions.  Junk yard axles are likely to be in good condition. 

 

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The stub axles are required to run M30 outer CV joints. 

They're similar to Z31, use bigger bearings and significantly larger spline.

 

M30 on left, S130 on right. 
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The M30 stubs kick out the track an extra 5mm, and the brake caliper requires a spacer to function properly.
 

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The next issue to deal with is the axle lengths, the M30, Z31, and pretty much all newer nissan axles are too long. 

 

The two shorter axles are S130, the longer ones are M30. 

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The S130 turbo axle shafts are pretty much identical including the spline. 
The only difference is that the tripod bearings are pressed onto the s130 axles, vs c-clip fit for the M30. 


Another benefit, the CV boots are now readily available for $15 aftermarket or $40 from Nissan. 

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The end caps are a pain to get off and on the first time, slap them against the tripod bearing a few times they'll pop off.
They're press fit need to be clamped and sealed when replaced. 
I used sleeve retainer 640. haven't had an issue yet.
 

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The M30 factory axle bolts come with some sort of thread locker, so I always put more on when I replace them.

 

$75 replacements are much better than paying over $1500 for a custom axle solution. 

 

S13 inner tripod CV joints are functionally identical to M30 outer CV joints. 
New aftermarket S13 inners are available for $40/each from febest.
I've found that usually the outer CV joint wears out before the inner.

Since I stripped out my gearbox before having an issue with one of these axles, I'd say they're strong enough for most use cases. 

 

The M30 long nose 3.91 also fits with minimal modification, just need to swap over the input flange & grind a bit off the casing.

 

 

Edited by stupid_fast

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Nice, I've run Lemons four times now but all at Sonoma. We keep wanting to build a car and run more of the West Coast races but having the time to do so has prevented such ventures. Came really close to buying a $400 IROC Z Camaro lol! The E36 is probably the perfect chassis for low-buck enduros. It's cheap, easy to work on, has great parts availability, and is fun to drive.

 

It would be cool to see the ZX at a track event sometime. If there are ever any old Z's at the days I go to, they're always S30s. I run mostly with NASA but also Trackmasters and Speed Ventures. Once in a while, I'll do a day with some other random club. Let us know if you sign up for any!

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Posted (edited)

Leon,
My first time in lemons was at the last Sonoma event in the rain, the E36 was fantastic to drive!  Its a monster in the wet. 
I'm in the unicorns aint U's car #201. 

It'll be a couple months before I'm ready to go to the track with the z, after moving and all.  Also waiting on funds for a new wheel & tire setup. 
I'll definitely let you know, it should be either sonoma or thunderhill.  Probably will be with SpeedSF to start out as I've already gone to several of their events before.  

I'd be interested in some other track events as well, as long as they aren't super novice oriented.  Open passing and plenty of run time makes me happy. 

Edited by stupid_fast

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Right on, I've been running the Works Mitsubeastie in Lemons. It's slow as hell but the most fun I've ever had on track!

 

I'll be sure to say hi if I ever see an S130 in the paddock. :) I may come up to Sonoma next Saturday for the Speed Festival in case you plan to be around.

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On 5/27/2019 at 9:16 PM, Leon said:

Right on, I've been running the Works Mitsubeastie in Lemons. It's slow as hell but the most fun I've ever had on track!

 

I'll be sure to say hi if I ever see an S130 in the paddock. :) I may come up to Sonoma next Saturday for the Speed Festival in case you plan to be around.

 

Leon, I think stupid_fast will also be at the autox at sonoma September 14th... You should come out. Fuel filter issue or not. :-)

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1 hour ago, Gollum said:

 

Leon, I think stupid_fast will also be at the autox at sonoma September 14th... You should come out. Fuel filter issue or not. :-)

 

Nice, we'll see if I can make it. I'm already planning to run the road course with NASA the weekend before so the wife will take some extra convincing if I'm going to make it happen. :)

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Having trouble uploading the video, but if it worked here's a lap from my recent visit to buttonwillow. 

Had some running issues, but overall felt great to get out on track. 

 

 

re uplaoded w/ youtube.

https://youtu.be/xv4rmxQ1vH8

 

Edited by stupid_fast

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