Cubes

Have a look in the stickied rb30det thread.

Nathan, Hows the gearbox input shaft seal? No seaps? I had a seeping front input shaft seal that caused occasional strange slipping. Other times it was perfect.

I run BCPR6E NGK's. They are gapped to .8mm and are the V-groove type. The V-groove is supposed to improve combustion at lean afr's, unsure if its a gimik or not. I grabbed mine from motortraders, ~$16 for 6. I've always ran these, never had issues with fouling or missing, the longest I've had a set in for was ~30,000km's. They were still fine, I've had my current set in for ~20,000km's, I will replace them before the next tune.

Its all beginning to make sense now.

Do you have a rb25det in your r33 gtr?

How is it possible to gain airflow potential at higher pm's and not loose response/airflow velocity at lower rpms? Similiar to using 3.5" IC piping or running an IC that is too large for the application. General driving conditions it will tend to make all its boost a little later yet on the dyno it will make all its boost at basically the same rpm, as there is time to fill the void so to speak. Obviously a .7 comp cover is still very small compared to the area of an ic/ic piping. Bad example but hope it makes sense. Once again I worded my question badly. Here it goes again. I'm interested in the transition period from zero vacuum to the set boost level. How will the larger comp cover affect this? Will it feel more linear as a result less responsive? I should bolt the smaller RB20DET comp cover on to my VG30DET turbo (exactly the same compressor wheel between the two) and see how it directly affects the power delivery. If my middle name was moneybags and not unibum I would spend $70 and have a before/after boost trace on the local dyno. argg..

So how does a large comp cover affect the power delivery and overall feel? Would it be correct to assume a larger comp cover will give the feel that you require more throttle to have the same acceleration? Given nothing but the comp cover has been changed.

The orings go over the pintle caps, with regards to your drawing thats 1.

When you get the injector done. Be sure to post the flow report, I'm keen to see what they flow at 80% duty.

R31 Nismoid, The XR6 was definitely not stock. It had a rather loud exhaust, twin tips out the rear, Orange colour with big white stripes painted down the middle of the car, very much lowered on 18" wheels. It went hard there's no doubt about that. It easily cleaned up a VY II Exec V8 that was caming over with a nice lope. When it launched it didn't get up on boost straight away, it took roughly half way across the lights for it to really kick hard, and begin struggling for traction. It was definitely not a linear boost build on the xr6, it seemed as if it was going hard then all of a sudden it would kick hard and scream off. With regards to warpspeeds comments, I guess some times I mistake lag for response. As I understand it, you do nothing else but use a larger compressor a/r and you will reduce response. I'm still getting my head around turbo comp and turbine matching etc.. The XR6 boys with the stock turbo are running up to around 385rwkw on the stock .5 comp cover. Thats pretty much where it ends for the stock xr6 turbo, thats when they look at upgrading. Generally to a T66 wheel of some sort and push 400rwkw+. Now knowing this I wouldn't even look at the larger comp cover.

skylinecoupe, Where abouts did you find the OZA395-E2 for $80? Cheapest so far I've found is $118. Repco - $145.00 Motormates - $118.00 Sprint Autoparts - n/a only bosch Autobarn - $ monday

BHDave, The GT30 vg30 hybrid kicks you in the arse at around 3800-4000rpm on an rb25, drop 500-600rpmf if its bolted on the side of a rb30. By lag I mean it didn't start screaming to what sounded like 3500-4000rpm when idling off the line, it seemed ok once rolling, just off the line in the lower gears she sounds a little laggy.

Rattling, are your sure the cars not pinging/detonating? I've had a half dead turbo on my car, it used to make a zing noise on boost, quite nasty sounding. The compressor wheel was ever so slightly touching the housing as it sucked forward.

Mine took 1hr for only a wot tune, ignition and afr's. And thats only modifying 3 load points over the rpm range. That leaves 16 load points (I was using up to load point 19) left to tune. So if you worked on every single load point it would take a total of... 16/3 = 5.3hrs + the 3load points which brings it up to 6.3hrs. Bodgy calc, but I can see how it can take so long if your really anal (I dislike that word) about having each load point perfect when using the hand controller. Cold start is spot on with the pfc, as is warm (warm is bad with the rb20det pfc, use the rb25/rb26 values) An area of improvement is the light and heavy load water temp injection correction table, Use the R34 values as its already been tweaked. Waldo, I would be curious as to see if your water temp injection correction table is close to the r34 one. Mine runs so so much better with the R34 table, the base table was flooding it causing the car to bog down at low rpm when stone cold i.e no warm up, simply start and drive off lightly.

Just to throw a spanner in the works. I went for a little drive to quieten down the bubs tonight. I saw an XR6 booting it along off sets of lights, surprisingly it looked a little laggy, sure it had plenty of boost transition torque/acceleration due to the 4ltr but lag is lag. :| Has made me think about stepping back to the GT30 -12 VG30 Hybrid. There's a couple ppls bolting this setup on to their rb25's soon, hopefully the results are all consistent, 270-280rwkw. If so, that will be fine for me. Will have to get my self some decent tyres and suspension/diff setup to get the mid range stump pulling power to the ground.

The reason Ford used the .5 comp cover is for response, nothing to do with keeping the power down or because it is a low boost application. There is no doubt the larger comp cover will be more efficient and make the power easier but not that much. As a bodgy comparison... Consider the GCG highflows, the stock rb comp cover makes say 245rwkw odd. Slap on a .7 and it makes 260rwkw. Thats 15rwkw. Then consider dropping on a larger turbine housing, 245rwkw or so jumps to 277rwkw. What I'm getting at is the biggest gains are to be had from the turbine side, not the compressor cover. From what I've been reading up on, the larger .7 comp cover only offers 3-4% increase in power. I really think your better off spending the $$ on a nice set of cams and springs that will need doing and pick your self up a second hand $1400 XR6 turbo. Cams with the large turbine housing will work very well. I think from more of a performance to $$ point of view.

Fatz made 270rwkw on 14psi with an untouched rb26 ecu running 10:1 afrs. If the motor has forged rods then I would say the .6-.7 a/r cover would be worth while. Remember with the .5 on the 3ltr its not going to really start going until 3800-4000. Is it worth making it even laggier and less responsive?

Wiring up the fuel pump today, All I need to do then is book her in to Shauns.

I was charged $120. The origional quote was $150, he let me off a little. The price was middle range, petroject I think they are wanted $168 inc. GST, the buggers quoted prices without GST. There were others that over the phone gave me the impression they didn't give two sh*ts and were around the $120 mark. They also didn't come with reports on each individual injector, just a yep we have got them flowing within 2% of each other.

As per the nissan manual, voltages should be up around 14 something volts when cold then drop to 13 something volts once warm. How much was the alternator from Nissan? Its possible they supplied the incorrect one? Unsure if that would cause overcharging or not.

Fitzpatrick Speed Works, How does the Castrol 10w60 fair? That is far from an 'econo' oil and doesn't meet the new emission standards so to speak. As it states, for highly stressed competition engines.

Its already installed. I'm running a dedicated feed from the battery via relay. Under load its only seeing 11.something volts. Not the 13.8 as it should. Then later on I will ditch it and throw an 044 in there, I'm currently running a 910 that won't cut it for over 250rwkw.

The date is nearing and my car still isn't tuned. Hopefully I get the fuel pump wired up tomorrow.

Platinum, Nice, Good luck with it all. You don't know a Nathan by any chance?

Disco, Sorry buddy, I meant to type turbine housings, not turbines.