Batou's 1993 Eunos Roadster NA6CE S-Special - 黒い龍

 Nope, both times it was off.

My main concern was the strain on the motor, greasing the windows and replacing a £4 part is much cheaper than a motor replacement 

So one of the things I need to do is pull the gearbox and check the source of the leak in that area and resolve that but a few things are running through my brain, one was to do a lightened flywheel while I'm in there... they are pricey and really do they gain anything other than a bit more of a peppy feeling for the sake of more jolty of throttle (I've had lightweight flywheels on other cars)? So this idea has gone back and forth, and I nearly ordered a JUN 4.6kg one the other day but my brain has gone back the other way so I think I'll just get the oem one refaced this time round (the clutch has only seen a few thousand km since it was last done but really for the cost I'll undoubtably put a new one on incase the other one has any source of contamination thats not obvious).

Now with money saved in one area its only fair to think about where else it could go, obviously the first being the rusty front wings and associated work, I'm just waiting to see if theres a black friday discount before I pull the trigger on some new ones.

Other thoughts I've had was the consideration of a better differential down the line, I'm sure any issues with traction on a 1.6 can be fixed with stickier tyres but if I needed a new diff I'd like to have a route in mind and a post from Zed. had me thinking a little. I decided to maybe continue that here rather than clutter someone elses build thread with my brain faff...



I did a little digging in regards to that diff and it appears it used to be used by the spec miata guys, however when it became very hard to get hold of and new items were not available they opened up the options to allow the Cusco MZ into the regs. Now I've had a look at this and both the MZ and the milder version, the RS is still available for the NA6CE and whats more you actually need the VLSD shafts so a 1.5 Way Cusco RS is essentially a "straight swap".

I like the idea of this, as one thing that puts me off other options is you always have to go down an overpriced used route, it might have been the cheaper way at one point but the cost of 4.1 torsens let alone 4.3's is just silly now. However, your probably thinking what I'm thinking, how is putting a shiny new plated diff onto a worn 6" ring gear and pinon that has done 205,000+kms any better? So yeah, you might dump £500 or so on the Cusco only to find that your back to the drawing board again, only your sourcing a used VLSD housing instead of a a 1.8 diff, shafts and prop.

So I guess my question is, firstly, is it actually worth the expense to put a plated diff on a non turbo/itb 1.6 in the first place? Secondly, is there anything you can do refresh the ring gear and pinion other than sourcing one with less miles/abuse? Or stop worring about the 4.3 ratio and just get a "cheap" 1.8 open diff with a 4.1 and put a plated lsd in that instead and lose a little pep in place of more skids? Feel free to tell me I'm being a complete prat and just wait until it actually needs doing on the diff

Ahh, see these are the details I need to fill in. The Cusco catalogue specifically states that the auto must change to the VLSD specific shafts, so there is more than one type of VLSD shaft in circulation?

Yeah thats my thought, really if my current 6" ring gear has lasted this long, then one with less miles/rebuilt should be absolutely fine sans any aspirations to put 300hp through it. I guess there is nothing you can do to reinforce the casing at all?

I had no idea the auto had a 4.3, that hadn't even hit my radar in all honesty. Thanks fo that

chances are thats a translation issue?




from what I've seen, no.

theres just not the metal in the Pigshead to work with

the 6" diff (& mx5 engine) has its origins in the rear of a 323GTX and they had transmission failures from new - although that was a 1.6 turbo & easily fettled




iirc, the 1.6 base models & possibly 1.6 auto's are about the best place to look although after 20something years theres no telling

Rich.

X 2 for lithium grease and silicone spray in the rubber window channels.

Being a Japanese company there may be some communication issues and I haven't used them prevously, but blackhawk japan, rhdjapan I have. It just so happens greenline was better on parts prices, you have to get a quotation beforehand so might see how easy they are to deal with first. As always with buying overseas, use a credit card and if problems arsise contact them within the time window if you have any problems with the supplier.