What's the go with these? Are they some special turbo or just a t28 rollerbearing with a fancy name? Cheers,
Similar to standard GTR turbos only they are steel wheels, while standard GTR's have ceramic wheels.Ben
N1 Turbo's We had a pair arrive yesterday, genuine Nissan R34 N1 turbo's which we are bolting onto a R32 GTR eng we are rebuilding with strong bits. Yes they are steel wheel so stronger and ball bearing and rated at around 320hp. They are T25 and bolt straigth up to a GTR. They would be similar or same as a Zed two bolt inlet, can't remember if two or three bolt flange for outlet of comp cover. They could fit a zed with rotation of housing and remounting of actuator and at most outlet, also 5 bolt rather than 4 bolt exh housing so a bit in it. S15 is cheaper and easier and possibly better option. This is what I am using on motor we are building for my zed.
Needed Needed a rebuild anyway. Not worth $600 a piece if they need a rebuild. Looked very clean though. Hey what do you think about this ceramic impeller stuff, John? is it scaremongering and they're fine at about 1bar? Or do they really fall apart at quite low boost?
Can do On R33 GTS-T they can and do let go at 15 psi and above, GTR R32 & R33 are also ceramic but seem to survive boost well over this no probs. You can now get ceramic bearings and steel wheels. The trick is to get the right combo of turbo manifolds, and engine.
I do think. The t28 rollerbearing would make a superb upgrade really. Yeah I was told the GTR ceramics could take 18-20psi no dramas. But you're right, some of the other rollerbearing t28 type turbos have failed at quite low boost. (reliable sources) I assumed they were the same and maybe the failures were exagerated. But yeah, would be a nice spooling turbo you could run on stock injectors under 1bar me thinks. Maybe some of those ceramic jobbies aint all that bad after all, would be more responsive then steel too.... and yes so easy, just clock a housing and add dumps. Cheers,
A crude but simple test When you get a factory 300ZX non ball bearing steel wheel turbo off the car and spin by hand they are quit stiff compared to N1 or S15 or other ball bearing turbo's. When on the car with oil it is a bit better though I suspect. Athough the bigger the turbo they seem to spin up easier, also more inertia which makes them stay spinning longer both spinning by hand and on car which you can hear on the car and see if inlet is off. Zeds don't seem to have a lag prob though. GTR factory turbo's could work well on a zed although only a fraction bigger they seem to be strong enough and spin up better. GTR's are still much more laggy than zeds as smaller motor. They won't make much more power but for circuit a bit more power without the lag could be good. Would require differnt dumps to be made and need to rotate housings and make actuator brakets etc.
For an auto Zed. Maybe a better upgrade then manual. Yeah would make a lil more peak, but by the same token it wouldn't be too much for the stock injectors or a rising rate regulator which makes them even more attractive. Dumps are easy $200USD more or less including freight for HKS type elbows. Can't figure it out still. 2600 GTR got ballbearing t28's and the Z got journal t25's being 3 litre. (really should have put them on the Z but goodbye gentlemans agreement) Anyways, got a guy searching some shops in Nippon he says there's plenty available. (some nearly brand new as upgrade turbs often fitted to R34 GTR's with incredibly low k's, and some a bit sad and really only good for housings) Bah, Nissan should have fitted them as OEM who cares about circuit would be a way nicer street turbo then anything else. Be well,
GTR is T25 also As I said they are not much bigger than zed turbo's. GTR's have slightly bigger injectors also but the turbo's are not T28. They are T25. Common upgrades for the GTR are GT2510, 2530, 2540 and 2540R. T 28 would require custom manifolds and would be tight for low mount factory location, I think would have to be high mount. As for the N1 Turbo's I am at home at the moment so can't check with supplier but they are prob similar to 2530. The S15 turbo is a T28.
Always a new piece for the picture. I often see them listed and advertised as t28... So GTR got t25 with 5 bolt t28 type exhaust. t25 rollerbearing is ceramic impeller and can boost higher then the rollerbearing t28 ceramics which are the ones to avoid... and then we have steel wheeled Nismo N1's to boot. All rather confusing but my numb brains gettin' there. Never really investigated GTR turbs as the ceramic wheels caused me to think they were no good. So what is the AR on a GTR turbo? somewhere between our t25's and a t28? Cheers John,
