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KatoKid

Kato Kids BMW M3 powered 71' 240Z

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Posted (edited)

So another shitty Melbourne day bought me some more shed time!

Spent most of the morning giving the underneath of the car a full clean and going over, boring and not photo worthy but its worth it to maintain the finish.

Also changed the engine oil  for the first time since having it on the road. Done about 4,000km now and happy to report no shiny sparkles in the oil or filter.

Did the main cabin when I first built the car but decided to sound deaden the spare wheel and hatch area.....and  ran out of sheets....anyone got some Carbuilders left over from their build so I don't have to buy a whole box?

Got around to tidying up the rubber grommet where the igniter wires come though at the rear of the rocker cover.

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....and I painted the Allen bolts for the rocker cover!

 

 

Edited by KatoKid

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Nice Dave, little things but as usual great attention to detail. I look forward to these sort of days in the future. It must feel good to fix some of those niggling little things that you just don't quite get to during the frenzy to get the car back on the road.

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Haha....yes it is a good thing Jeff to be able to concentrate on just fine tuning little things rather than having to worry about bigger issues.

Yours is coming along really well. As you've found, now is the time to have discipline and do everything right the first time!

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I wish I was down 4,000 k’s and enjoying such mundane pleasures ;)

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Been meaning to do this for a while and since I'm taking the car for a run at Sandown this weekend thought I had better pull my finger out.

Pick a part is just up the road and 20 minutes of walking up and down the rows got me a suitable overflow bottle and mounting bracket from a mid 80's Magna. Made a plate to bolt to the radiator support using the original holes and welded the Magna clip on mount bracket to that.

Nothing really else to do for Sandown, just a quick check underneath and time to let her rip. 

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On 6/5/2019 at 2:19 PM, KatoKid said:

Nothing really else to do for Sandown, just a quick check underneath and time to let her rip.  

 

 

In car camera mounted? No video, it didn't happen.

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It did happen......great day out with all the guys.

Car was fantastic!  Temps and oil pressure were great, had to wind half a turn of bias out of the rear brakes and bumped up the damping on the rear, otherwise handling and car behavior under brakes was better than my driving skills! The top radiator hose partially came off in the third session but only lost half a liter of coolant, made a bit of a mess in the engine bay but easy enough to clean up.

Awesome day but also relieved to get the car back home with no damage of any kind.

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Posted (edited)

So everyone has a dirty little secret.....don't they?

Well here is mine.

When I first got the car on the road I swapped diffs a few times to decide on ratios and LSD's and for only some diff's I had a nasty driveline vibration above 100kmh. As a reminder my tailshaft uses the standard BMW "guibo" rubber doughnut at the front and a CV joint at the rear and the guibo joint cant tolerate any significant deflection meaning the output shaft of the gearbox needs to point straight at the nose of the diff pinion. Lasers make this an easy job and I was sure my angles (or lack there of) was good so it had me stumped why I had this vibration.

I did a lot of research and  had the shaft checked and re-balanced and also tried moving the gearbox and diff pinion to see if it changed anything, all to no avail. It felt more like a natural harmonic than anything else so I started looking at what could influence this and decided to redesign the front "RT" style diff mount. The original version used a captive Energy Suspension transmission mount as used and recommended by Ron Tyler who came up with the RT mount idea but this was in Z's with standard gearbox, tailshaft and diff combinations. A few guys on this forum have gone with SW Motorsport front diff mounts which is completely different to the RT design but works the same way. I cant use the SW design because of my exhaust and need for a modified crossmember so I spoke spoke with Stewart and he was good enough to tell me what rubber bush he used in his design so I used this to design a version of my own.(Bolt through the top and lower bush is missing in the photos).

Cut a long story short, the change from the  Energy Suspension mount to the bush recommended by SW seemed to have solved the vibration problem on the road but the excursion to Sandown yesterday was going to be the real acid test....and so it was. I managed to peg my Speed Hut speedo at 200+ kmh on the front and back straights and no sign of vibrations....so very fricken happy its finally sorted!!!! 

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I cant explain why, but the change in bush stiffness has eliminated the harmonic. The SW bush is much more solid than the Energy Suspension design but doesn't transfer any more NVH .

Edited by KatoKid

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Posted (edited)

So speaking of dirty little secrets.... there are some on this forum who are also active on  http://www.performanceforums.com/forums/

In regards to the above vibration issue I connected with a guy on PF who has an awesome FD RX7 with an LS swap and seemed to have exactly the same issue. We swapped PM's back and forth and while he is yet to solve his completely  he is on the right track http://www.performanceforums.com/forums/showthread.php?67314910-Tailshaft-vibrations-VE-T56-in-FD-RX7&highlight= 

He has just moved down to Melbourne from Brissy for work and is in a rental for 6 months so has nowhere to work on his car. He is going to PI next weekend for a PIARC day so I offered for him to come to my place and use the hoist for prep work, which he did today. Sweet car Gav!!!! #norotors

Awesome build thread here http://www.performanceforums.com/forums/showthread.php?67313686-Luke-s-FD-RX7-FDL98&highlight= very talented dude and nice guy.

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Edited by KatoKid

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I've been looking at seat options for a while now and the Sandown track day really reinforced how inadequate the standard seats are and I saw exactly what I wanted on FB. They turned out to belong to Cracker  (James) on this forum.

Seats are Velo "Milano" model which they haven't made for a few years and are pretty popular with the Z crew due to they narrower dimensions so the wings don't interfere with the top of the door trim. They came with adapters for early 240 rails which is a huge  bonus and they fit perfectly first time so good job done by James, thanks mate!

Additional bonus was I also picked up some head height clearance which I never thought would be an issue until I drove with a helmet on.

Went for a short squirt in the car and they feel tremendous, no more hanging off the steering wheel in the corners and they look terrific.

;D:D;D:D

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Posted (edited)

Crackin day in Melbournistan for the last day of winter so took the Z for a blat late in the afternoon.

Chose my normal loop which heads out towards Yellingbow and came around a corner to find this on the road. Guy on the other side in a 4WD had also just pulled up so reckon the tree came down only a minute or so before us there was a bit of traffic.

Snatch strap on the 4x had it sorted in no time. Pretty decent tree that has been dead for a very long time.

Given the recent similar events where people have been killed or injured I was pretty relieved I didn't arrive a short time earlier!

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Edited by KatoKid

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