R34 GTR BMC and Servo upgrade on a Z32 - anyone done this?

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January 8, 201610 yr

Just wondering if anyone's attempted the above? R33/R34 GTRs use a BMC with a larger piston giving better brake force. I believe it fits with little modification.

Has anyone done this or seen it being done?

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January 8, 201610 yr

I was under the impression the 17/16" BM57 unit was a big one in itself and the largest thing that fits. I take you haven't got a master cylinder brace? I'm sure you've seen it before but the flex on the firewall when you depress the pedal is huge.

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January 8, 201610 yr

A larger diameter BMC piston will actually give less force at the calipers than a smaller diameter piston for a given pedal pressure.

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Tyre size recommendations

Might be stating the obvious (to some) but something I didn't realise until I started trying to pick tyres for aftermarket wheels is that the profile figure - e.g. 40 - is 40% of the width.
So for a 255/40/17 tyre - diameter is 255mm, profile / side wall is 102mm (40% of 255), and radius is 17inches.
Learning this made it all make a lot more sense to me. I also have this graphic to refer to. Can't recall where I found it but it's now saved on my desktop!

I also wanted a chunky looking tyre with a solid side wall and after going 245(F) / 265 (R) , have since switched back to 235(F) / 255 (R) as I found the handling was noticeable more boggy and I use the car for fast road and track use. For ref, these tyres are on 18" BBS LMs.

By sumshiftyguy · 3 hours ago3 hr
UK Importers Advice

I used Josh @ Gorilla Imports in 2021. My first time importing and was a very good experience.

By sumshiftyguy · 4 hours ago4 hr
Tyre size recommendations

245 on an 8J will look like a balloon on a 8j….. an 8J is only 204mm wide

The tyres you currently have a 2% smaller in diameter and circumference that the OEM wheel/tyre combo

Personally would be looking at a 225/45r17. Plenty of very nice tyre options and only 0.4% different diameter from OEM size

By nickz32 · 14 hours ago14 hr
Simply Japanese at Beaulieu 19th July 2026

If I’ve built and installed my engine by then (which I bloody hope I have!) I’ll be there

By nickz32 · 14 hours ago14 hr
Suggestions for Potential Valved Exhaust

Personally I wouldn't bother mate!
Valved systems are fine where they are an OEM fit on new cars, but why waste cash trying to replicate that on an older car which sounds pretty decent from the box.
Go and speak to Infinity (the guys next to Jim) and get them to custom build a "normal" system for you. I did and I am very pleased with the result.
My old Mongoose was too intrusive at cruising speeds, so Infinity fabricated one with extra resonators at the front, which made cruising quieter from inside the car. They then used smaller silencers at the rear, so the best of the noise is out back. If I want to have a little fun and enjoy the rumble, I just open the windows.
No fancy switches to mess around with, it looks good, sounds good (without the added knob-headed attention seeking function) and only cost £600 all in.

By RichardS · 15 hours ago15 hr

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R34 GTR BMC and Servo upgrade on a Z32 - anyone done this?

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