M@&k

You're right, probably should have done it with the GTX... Might have a go at that later. Even at lower pressure ratios (e.g. 2.2) seems to envelope both the 3071 and 3076 though. I was quite surprised.

Also for s#!ts and giggles, I overlaid GT3071, GT3076 and EFR 7163 compressor maps. Notes: Efficiency island: GT 76% EFR 74% Speed lines: GT 120k EFR 110k & 130k The 7163 looks pretty damn impressive. Thoughts on how spool time would be compared with GT3071?

Been wondering if it's physically possible to fit a 7163 onto a RB25 stock manifold. I make out that a GT3071 is about 150mm from face of flange to furthest point on compressor housing. The 6758 (which I understand is outline identical to 7163) is about 165~170mm in T25 form. Possibly even bigger in TS T4 format. Given you would need a spacer to fit the 7163 (to convert to T3), it's probably 20mm or so closer to shock tower... Anyone know how much extra room there is in R33 GTST engine bay with GT3071 / GT3076? Would one of these EFR turbos fit? Pics below of references. I made pretty agricultural measurements assuming the pics are to scale.

Hi all, Just saw Sonic Performance are advertising the GTX3071R (without turbine housing) for $975. "This week only" It's on the home page of their website if anyone is interested.

Have been looking at comp maps for GT2871-52T, 3071 56T, and GTX3067. Pic below shows comparison. Speed lines are all 120,000 rpm. Efficiency lines are all 76% At a pressure ratio of 2.2 (roughly 18 psi), the GTX3067 looks like it will only do a smidge more than the GT2871. So perhaps shouldn't expect much over the GT-RS top end. It does seem to be quite a lot more efficient at mid flow, so more mid range. More mid range than GT-RS is not what I would be looking for though. Not sure what to make of the difference in speed lines.

Yeah I think this is what has been gnawing at me lately. If the 3067 is not going to do much more than 260kW at the wheels, then might as well get a Hypergear bolt on and not have to worry about a new dump/front pipe. Always had it in my mind that the 3067 would be able to do 270rwkW with potential for a bit more (280) after cams. What I really want is for this to be a Pro S replacement with a bit newer tech and for half the dollars. But just because I want it to be that way does not make it so unfortunately...

Agreed. But then I would describe the HKS Pro S in the same way. Although it had the 56T instead of 52T compressor right so I guess a step up on cold side too. Gah, I dunno.

Looks good. Even more convinced I need to go 9.5 +22 all round now. You were worried about fitment on the rear? Why not just swap them over and try it out?

I figured the smaller compressor wheel would take less effort to spin up. The 3067 still has its efficiency island peak at moderate boost pressures (e.g. 2 to 2.5 pressure ratio). So not hugely dissimillar from the GT3071 I would have thought?

It should fit without a spacer I believe. I see the GTX3067R as being roughly the same flow wise as the GT3071R, but hopefully with better spool to improve the mid range a bit. What's the latest on your install? Pretty keen to see results.

The 235/35 would be a smaller rolling diameter than the 265/35s. I believe 235/40 is closer to the stock rolling diameter, and also a more standard size I think... I'm running 235/40 front, and 265/35 rears. Got any photos? So many people fitting new wheels, not so many posting the results...

Yep that's basically the target. Will be running 98, so figured 260rwkW would be absolute minimum I would be happy with (otherwise might as well get GT-RS?), although really would be aiming for 270-ish. Not interested in engine rebuild just yet, so sub 300kW is the plan. First big upgrade for me, so having trouble pulling the trigger. Pretty confident this turbo will do what I want. Just a bit paranoid about buyers remorse later, haha. Anyway, I guess that's the nature of these things. Certainly wouldn't be anywhere close to a semi-educated decision without the loads of info on SAU.

Hmm, yeah good point Disco. I guess I'm kind of hung up on the HKS GT2835 Pro S. That's the turbo I really want, but prices (new) are just stupid. Have been wondering if there is a way to replicate it for a decent price. I guess the stuffing around isn't worth it given all the off the shelf options available.

Apologies for thread bump, but was interested in more opinions on this turbo. In particular I was interested in thoughts on how the GTX67 compressor might go with the cropped GT30 turbine. For arguments sake let's assume it's in a decent T3 turbine housing (e.g. HKS Pro S style). So, any thoughts on performance of GTX3067 vs. GTX3067-WG on RB25?

No T3 option apparently.

Why not buy local indeed. Adding that to my upgrade list. Thanks Scott.

It's possible to get a similar kit locally then? With the Xspurts?

Agreed. What I was worried about is; is the price too good? Wondering if they're knock off injectors or something. Says they're genuine, but...

I've seen advertised on eBay a kit for the RB25 including 1000cc Bosch injectors for US$700. Comes with injectors, rail, plug adapters, and a FPR if you pay "buy it now" price. And supposedly will fit under the stock plenum. Seems to be too cheap for what's included: http://www.ebay.com.au/itm/Nissan-Skyline-RB25DET-r33-GTS-T-1000cc-Bosch-Fuel-Injectors-Kit-Fuel-Rail-/200968949936?pt=Motors_Car_Truck_Parts_Accessories&hash=item2ecaaed0b0&_uhb=1

Yeah, point taken. I guess at some point of boost (or perhaps more accurately engine flow) the back pressure at the turbine inlet would become high enough that the wastegate becomes the path of least resistance and starts flowing. The question then is at what boost level does this happen... it depends I know I would imagine that for a smaller turbine and housing A/R the back pressure would be higher making flow through a 90 deg outlet more likely for a given boost level. Perhaps for a given boost target if you go for a larger turbine and larger A/R housing the need to have a smoother transition into the wastegate becomes more important? I agree that a smooth transition into the wastegate would be the most efficient for any application. Just curious if it would be possible to get away with something less ideal if it helps to package the gate and outlet piping.

Any more experience with running the gate off the turbine housing at 90 degrees (i.e. similar to WYTSKY above)? Thought I've seen pics from Stao at Hypergear with similar ~90 deg exit path off turbine housing. It makes sense to me to have the gate entry in line with flow as per pics of Scott's work earlier, but having it come off at around 90 degrees seems a bit easier for packaging the gate when using the stock exhaust manifold. Interested if others have also had success with wastegate situated as per Adam's (WYTSKY) above?

Had my Nistune (R33 S1) tune done by Danny and was also very happy with the work done. He was having trouble getting the Nistune to hold the tune but managed to sort it out. This was late in the evening and they were under the pump getting through the backlog of cars getting ready for Powercruise. I was pretty happy with the effort Danny put in, especially seeing my car isn't anything special, and I imagine less interesting for them in comparison to some of the other cars they were working on. After comments above I might think twice about getting any fabrication / installation work done though...

Comp map for the 7163 shows up on Borg Warners Match Bot as well. Not sure what place there is for the 7064 once the 7163 comes out.

About 1pm today saw a Gunmetal R35 with carbon fibre front panels. Was carving up traffic on Alexander road around Dianella area. Joy to behold.

Housings weren't always specified. But for HKS and SS1PU turbos I believe they generally only come with one option. For the GT3071 I expect they were mostly 0.82 AR housings. The exceptions are: the Neo with 301kW @ 17psi which used a 0.63 AR (one of the top 3071 results) the one with the AVO housing (noted on the graph) one with 234kW @ 15psi which has a "modified R33" housing. Stao, I will look at adding these. To try and keep things comparable, I was only looking at turbos mounted to the stock manifold, which ruled out your results unfortunately. Might look at a different plot for high mount results... ----------------------------------------------------------------------------------- EDIT: *** NOTE - THINGS MISSING FROM ORIGINAL POST *** Results looked at were limited to the following: Stock exhaust manifold 98 pump fuel only ------------------------------------------------------------------------------------