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I have S15 helical too. It is a bit worn. I think the drive behaviour you describe is related to this wear. Wear of helicals is something that no-one seems to have paid a lot of attention to, but now that they (as in original Nissan ones) are all a bit old - we're starting to see the consequences. The ends of the helical spurs wear into the casing. That's where they perform the braking that diverts torque. Some of the more modern helical designs have proper wear surfaces introduced there, but the Nissan ones are just steel on steel (or iron). -
I've had a range of rear diff centres - open, viscous, helical, mechanical, welded, etc. I can't go past a refreshed factory 32 gtr centre for consistent lock and street driving. The next step up for me would be the nismo 1.5 way , which likely suits you better as track sounds like the focus. Will chatter in carparks but its not the worst. I have never tried a quaife rear diff, an option I've looked at before and might be one for you ..... Currently playing with an S15 centre at the moment and I hate it. The transition from single wheel spin either side is just weird. -
Honestly, I did think the PDM could do it and thought Haltech told me the pump didn’t like it. But after re-reading the emails and comments above, I clearly misunderstood lol. -
By TurboTapin · Posted
I also run a CD009. I'm currently on a 4.08 and it's not great. I originally intended to run a 3.3 but had issues, more on that later. I'd stick to anywhere between a 3.3-3.7 as found in the 350z. As for brands of ring and pinions, absolutely stay away from Speedtek. They are absolute garbage. See my build thread for more information on that. I went through two of there 3.3's and both had bad runout. They were paperweights and they have still yet to refund me. I ended up putting in a Nissan 4.08, which was better then the original 4.36 but is far from ideal. I'm going to pop a 3.5 in this winter. I'd stick Nissan. I've also heard of a company "Neat Gearboxes" that makes them. Haven't tried them, but they can't be worst then Speedtek... -
You should Nistune the ECU, so you have freedom to use modern injectors instead of replacing with the same old shit. This is also required if you want to boost it up above ~200rwkW, where the stock injectors will be running out of capacity. Having said that, it is unlikely that the injectors need replacing just 'coz. If you imported it from Japan, the fuel should have been pretty good quality for the whole life of the car.
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