HS30-H

Which bit in particular? I don't want to scan each individual photo...

Kats, I have had SO many people over the years tell me that my ZG was "damaged" or "wrong" because of this detail. They haven't seen genuine OEM parts before. I was always reassured to see 'the gap'. It was a semi-secret way of telling OEM parts from replicas. Thank you!

Lovely 'ZStd' details. I noted the non-heated rear window and switch blanking plug, rubber mats instead of carpet, no bumper trim and can just about see the clock delete blanking trim (I want!). Rear spoiler would have been a later addition. What a great survivor. Chassis number is probably close to that of my '70 Z-L. Love it!

Hi Kats, Yes, after January 1972 (according to UK market factory documentation) UK market HS30s (and RS30s and GRS30s) received the FS5C71B transmission with the following ratios: 2.906 1.902 1.308 1.000 0.864 REV: 3.820 So, they were the same as yours quoted above, but they had the sliding spline type rear joint instead of the flange type seen on the Japanese market models. Personally speaking, I love the FS5C71A when it is in good condition and well set up. However, the design seems to have a very short ideal operating window and wears relatively quickly, and then it's horrible! The FS5C71B seems to stay nice longer. I think a lot of people only have experience of these transmissions when they are in bad shape, and that's why so many people (especially over here) are changing to later C type transmissions...

I don't know about your version, but my (old) version of the Spirit Garage system was designed to use the stock horizontal Nissan hangers forward of the diff.

No. They originally came with white paint where the red paint is now. Somebody painted them red, that's all. The only factory 'Red Z' for Japanese market S30-series Z models was on the horn pad of the S20-engined 432 and 432-R models.

Your comment being an example of the latter...

So when Nissan did it on their S20-engined cars and on their works race (S20 and L6 powered) and rally cars (L6 powered) and the likes of BRE and Bob Sharp followed suit on their race cars, you believe it had no reason other than "sound"?

Hi Kent, If you look for Peugeot 505 GTI vented discs you should get the right ones. They are best used with the late '73-up ('260Z') hubs, as that way you don't need to use a spacer. The '260Z' type hubs are distinct from the '240Z' type as they don't have the scalloped cut-outs in the wheel mounting area and are a solid circle of metal when looked at straight-on. However, there's now a new alternative. Kameari Engine Works in Japan have commissioned a reproduction of the original Nissan Sports Option vented type disc (long unavailable from Nissan/NISMO), which is a straight bolt-on to the '240Z' type hubs and has the right offset for the vented MK63 calipers. Back to a proper off-the-shelf bolt-on kit again.

Fujitsubo quote the current pipe diameter - several times in several different places - as 50.8mm x 2. Volume 13 of NOSTALGIC SPEED magazine - published July 2017 - carried an 'Advertorial' feature on the new Fujitsubo Legalis R system for the S30-series Z. See scans below: Old design on the right, new design on the left: Box on the bottom right gives data for an L28 engine in the tested car. Apparently their improvements have been realised through various changes, notably the exhaust manifold and the resonator box re-design.

Sean, where's the data regarding pipe size? A little bit further back up-thread you were quoting *STOCK* Nissan twin pipe system pipe diameter, but I am 100% sure the Fujitsubo systems use a bigger pipe diameter than that. Where are you getting your data from? Another thing: There seems to be a discrepancy between what the re-sellers (RHD Japan & Whitehead Performance?) are claiming about applicable models. I notice that Fujitsubo themselves are quoting fitment on chassis made between 1969 (Showa 44) and September 1975 (Showa 50-9). Caveat emptor. Also, "stock L20"? Where's that come from? In my opinion you're in danger of throwing a bit too much shade in Fujitsubo's direction. As a manufacturer/supplier of competing product, you have a dog in this fight. If I were you I'd concentrate on your own product and let the market decide.

From back towards the beginning of this thread: As with many things on this forum, we've been there before. Mike has a colour version of that Transcendental Racing/Frisselle/Morton shot.

Yogi Berra:

By the way Sean, one of the clues to guide us regarding the Fujitsubo systems is their 'Legalis' name. They are a tested and licensed road legal system for the Japanese market. Most others are not, and may have to be removed when the car is tested. There are restrictions on fitment, clearance, safety and - crucially - noise. When discussing 'ideals', you have to take this into consideration for the Fujitsubo systems.

Your quote: "....dual pipes are better suited towards the smaller cc engines (S20 and L20) than larger". Right there. Or am I seeing things? It only reads one way are far as I can see. In answer to your direct question to me, I presume (betting that Nissan knew a little bit more about all this than you or I) that there are benefits in a true dual-pipe system on a straight six engine. Those benefits might well include packaging/routing, and there would - quite possibly - be a limit to that pipe dia. wise? Most of the big capacity/big power-aimed systems made and marketed in Japan go to single pipe systems, and I presume this is also packaging/routing influenced just as much as anything else. In fact, such 'big single' systems often seemed to be 'drag' biased and less to do with variable range street drivability and (pleasing) sound. For the record, there are big pipe twin systems available in Japan, but they are mostly aimed at S20-engine C10-series Skylines. Maximum reasonable bore and stroke on S20 engines is limited to around 2400cc (you can go a little bigger, but it's marginal) so 'ideal' pipe dia on a twin pipe system for such high state of tune S20s is not going to need to be all that big anyway...

Sean, you're pointing to the fact that the Fujitsubo Legalis system is aimed at L20 and L24-engined cars (Japan didn't get L26 or L28 powered S30s) as confirmation of your premise that "dual pipes are better suited towards the smaller cc engines (S20 and L20) than larger". It simply doesn't follow. If dual pipe systems on straight six engines, as you say, "...help generate low-end torque without penalising top-end power" then why is that not scalable to larger capacities than 2000cc and 2400cc? Where's the science to back that up? Yes, the quotes are now much better!

Sean, half the time I can't work out what you're quoting and what is your original new text. I'm pretty sure I measured the OEM twin pipe system for you before when you asked. I don't have measurements to hand right now, but can check later. In the meantime, I'll ask the question again. Why would twin pipes not be scalable? You can't point at the Fujitsubo Legalis for an answer. You said "I'm tempted to believe that dual pipes on an S30 are better suited towards the smaller cc engines (S20 and L20) than for larger." Based on what premise, exactly?

I don't see why it would not be scalable? Bigger capacity, bigger (dual) pipes. Pipe size is linked to what you intend to put through it, no?

In the place that most suits "the USA", obviously...

You're a little early with your April 1st joke. Hopefully you won't get clipped by any passing traffic when you are messing about with your bonnet/hood stay. I mess with mine whilst I'm standing on the kerb.

It looks big enough, and "state of the art" enough, to me. 1969:

No R200s fitted as stock equipment on Japanese market S30/S31-series Z cars, Sean. We have discussed that fact before. On this same Fujitsubo/Spirit Garage topic, I believe. On this very thread..? That's why it should not be presumed - when Spirit Garage say their systems "fit S30/S31s up to '78" - that this means they fit neatly around an R200. Yes, R200s are commonly retrofitted to modified S30s in Japan.

So, rhetorical question, what diffs were fitted to S31 models? Secondary question, what models of S30/S31-series Z for the Japanese market were fitted with R200 diffs?

What's the perceived cost got to do with anything? Itagaki san of Spirit Garage is perfectly helpful if you contact him in his own language. That's Japanese. He hasn't set up his business to deal with export enquiries, and nor should he have to if he doesn't want to. If anybody really wants to buy Spirit Garage products, either do it in Japanese or use a middle man/broker.