Cubes

Post away. or email a nice quality if u wish. I have so many damn dyno graphs its not funny.

Tomorrow is fine. Yep I think that sounds like a good idea.. your welding skills + my what ever lol and yer we should be able to get them done. I've got a few pics of a spring compressor thats suitable for the rb det head.

lol.. well this thread sucks.. My weekend was ok apart from hearing my dear old nanna is a little sick (mild cardiac failure, mild is the lowest apparently), she should be fine with some medication though.

Can't wait to see the results.. May even sway me back to the idea of a similiar setup as to what you run. -------- For now with regards to this threads topic.. Speculation is crap, hurts business and could prevent another turbo supplier from selling something that works and is damn cheap, lets wait for results and let it be.

I wouldn't bother unless you run out of fuel. I had issues, I measured fuel pump voltage, rewired and saw the car instantly run richer at wot.

Ahh yes. My bad, I made an assumption and didn't read it completely. The route you have taken is much better than using the std comp cover and has been known to make the power you have indicated. I remember there was a bit of a debate regarding the horsepowerinabox turbo's that are essentially the same as what you have. They use the smallest gt30 and machine up the rb25 or vg30 turbine housings. Is there any reason you didn't go the higher flowing 76mm 52t or 56t comp wheel? The 52t 76mm comp wheel is the one HKS use in their HKS3037S. But yes there is modifications to the inlet and turbo outlet piping required with your setup which people who buy the gcg and slide turbo's want to avoid. With regards to your spool... Try a different ebc.

It needs more boost then. No idea.. it may be floating a little causing torque to drop off a little early but not quite enough for the lifters to pump up so its not that noticable?? Up the fuel pressure push more boost in to it and see what happens, somethings not right through as its definitely not making the power it should. The first sign I noticed saw when mine was floating was I had to pull timing out of the top end, considerable amounts of timing and there was one rpm point where it would ping no matter what ign value was in there. Pull a psi or two out and it was able to run a full 20degree's ign timing vs 2psi more and only 5-6degree's with still slight ping. I really wouldn't mind checking out what ign. values your running at wot some time, would be interesting if I can see the same trand as mine shows. I've now got another set of lifters so I will be dropping them in as soon as I make up a little jig to fit the valve springs up.

Yes auto's will a turbo spool earlier than manuals. You made this post only a month or so ago and stated you run the gt3071r-sp, thats not the gcg highflow item. As can be seen here at post 33. http://www.skylinesaustralia.com/forums/in...c=114193&st=20# and a pic of your turbo. http://image-cache.skylinesaustralia.com/f...-1145751218.jpg

Dangerman4, Unfortunately this isn't the case. The std gcg items behind a manual generally are all in by 3500rpm or so where as the VG30/R34 turbine housings are in by close to 4000rpm. And 275rwkw I believe is unrealistic and will only lead to dissapointment. Speak to GCG, expect 250rwkw. Either way.. They are two different turbo's at different price points. How can they be compared. As I said earlier... The turbo's are aimed at a different customer.

I tested that.. Using the chassis as an earth it raised voltage 0.5v over the std 11.2v I think your tuner is thinking we are discussing the high/low voltage.

I really don't believe bush has *much* of an influence on lag. There's another well built turbo that has springed to mind. Whatsisname's bush vlt style turbo that made 291rwkw. That was pulling hard and was all in by 4000rpm. Its a real pitty sau has dropped all the old attachments as there was a good dyno comparison from the same dyno that had Whatsisnames setup plotted against Steve's 323rwkw GT3037S. Whatsisnames had more mid range but obviously Steve's killed it in the top end. The VG30/R34 turbine on the back of the GCG highflows spool the same as that yet don't quite make the same amount of power. So it all comes down to the wheels selected etc as to how well it makes power and spools. What the specs were of that turbo I have no idea, I do believe the Tim Possingham turbo that Freebaggin runs was based on that but slightly better. From memory Tony Riggioly or however his name is spelt had the turbo put together using his specs. But there we go again.. we must compare apples with apples, a bush hybrid vlt style turbine housing with different specs is obviously going to spank the gcg if its been designed to make x power. What I'm trying to get at is I can't see a point in comparing the two turbos.. The GCG item has proven its self to make a solid repeatable 240rwkw, the Slide turbo's will soon also make their place within the market and every one will know what they are capable of.

With regards to the manifold.. stock.. ATP offer a t3 bolt up 5 bolt that uses their custom internal gate setup. How well it really works I have nfi. but yes thats the trade off.. At least one could be assured the gt30 would crack 270rwkw where as from what I've seen the GCG's struggle to crack 250rwkw. For example... An auto r33 I know of has hit 220rwkw on 14psi (sure its an auto so power is down a little) then there's a few others with manuals that have only managed 240rwkw (one R34 I know of that has 260 dur. tomie cams) before det sets in. But as I said.. where does one stop.. we could go on and on saying this is better than that but at what cost. There will always be those that are only willing to spend 1k, then those that are willing to stretch another 1k for just that little bit better and then those that will spend yet another 1 maybe 2 or 3k. This conversation really is a little silly... So far Slides turbo's have proven reliable, we must compare apples with apples. Most turbo places offer a bush type highflow? What do GCG Offer? If they start blowing seals or bearings die then there is a place for discussion. At the moment they really cannot be bagged. I think I am a little baised as I've seen how Bl4ck32's well put together bush turbo can do, and thats spool like a stock turbo yet provide so much more go. Hell it even spools better than my VG30DET turbo.

Realistically its half the price. As with everything its up to the individual and what trade offs they are willing to put up with. An extra 1k in the pocket or a slightly better spooling turbo. A little like rebuilding an rb25 or rb30. Myself.. After thinking long and hard I couldn't bring myself to purchasing a GCG turbo for the given price they ask of $1950. Tim Possingham (x owner of rpm and has been in multiple mag reviews. remember the stock ic vs fmic pressure drop test?) years ago had a little turbo that I believe used the VLT style turbine housing, I believe it was extrude honed hence the price, the setup cost ~$2900 but cracks 300rwkw. I would prefer to grab a genuine garrett item (gt30 or 35 with atp internal gate setup) if I am looking at paying around 2k for a turbo as for the little extra more over the gcg item. But where do you end lol... I may as well go on to say for a little extra more I should go external gate as its better. All though $1750 is starting to get close to what I would pay its still not close enough.

With regards to reliability. The slide turbo's as stated use a 360degree thrust so they are not cheap nasty's, for the price of $890 including a 360degree thrust, thats a damn good price. Here's a little explanation with a few pics of 270degree & 360degree. http://www.turbomagazine.com/tech/0405tur_...bo_tech_part_1/ As with everything to save a few $$ there's a sacrifice.. A little bit of spool. I doubt reliability is really an issue here as providing the turbo rebuilder knows what he is doing there won' t be a problem. I'm sure we would have heard about it by now if it were the case. I believe BB cores pushed hard only last around 70,000km's anyway. If I remember correctly 32gtr turbo's are bush, s14 turbo's are bush, vlt turbo's are bush. Providing they are put together well and looked after with good oil and no hot shut downs they will be fine. It all comes down to if one is happy trading a little spool time to save $$.

Where did you grab your Federals from Andrew?

How does your ax53b70p25 spool? Whats it rated at? I quick search hasn't revealed much.

Hows it spool now as R31Nismoid ran a GT3040 .82 and it was coming on strong around 4k. Is that what you want? Clint32 made 338rwkw and 580hp on the engine dyno with a GT3040 .82 That was running some where in the mid 20psi range, big cams, plenum, motec all the good bits. I believe Morpowa tuned it. The GT2835ProS runs the same comp wheel but smaller turbine. I wonder if it drops boost due to the lack of shaft torque required to drive the big gt40 82mm comp wheel. I think the next step is a GT35R. But with that comes lag, on the rb25 I believe they get going around 4.5k. On the RB30 the .82 GT35R feels suprisingly nice, comes on strong from 3500rpm+. Maybe something to look at one day if you really want to start nudging 400rwkw. Pair the rb30 up with with a oil pump crank drive collar and nice aftermarket balancer and they have no issues reving reliably. Or as one of the blokes has done here (and I believe he's in Adelaide too) used an rb26 block. rb26 rods, custom pistons, destroked rb30 crank for 2.9ltrs. So no block height issues or engine number problems.

What boost are you running Grepin, I remember a few years ago Steve was running a HKS GT3037S on his RB25 with real mild cams & headgasket to drop comp down to 8.6:1. That made 323rwkw on 23psi. Hrmm thats testing me.. I'm 99% sure it was 23psi. He was running the PowerFC ebc and said it held boost perfectly. So what you want to do is have the 2835pros turbine housing machined up to suit say a gt30/40 or something similiar? If thats the case it may be worth seeing what you can get for your pros turbine housing and buying in a 3037pros turbine housing from the states. Then drop it on the rear of a gt3040 and have just that little bit more compressor flow. If it would work better in practice than a similiar hks spec'd gt3037 is questionable. How the 3037s works so well with its compressor is beyond me as on paper it doesn't flow all that much compared to the 76mm gt30 comp wheel.

I have another on the cards.. A set of Federal SS595, apparently one of the better ones. I believe Sky30 has tried a whole range of tyres on his rb30det 300rwkw rwd thing. These apparently came out on top for grip and were suprisingly cheap.

hrmm.. I may look at these Hankook tyres as its the size and price range I am looking at. I was set on a set of Toyo Tranpaths as a mate had them on his VL and they hooked up pretty well, apparently a silicon based compound tyre.

How do the Nitto's hold up? I believe Whatsisname is still running a set, I remember 555 something on the sidewall. Last I saw that was able to get a lot of first gear down, what looked like all of second and making close to 300rwkw.

lol.. yes I must get around to doing that. How long has the motor been in now?

Yes 295rwkw on std fuel system I believe they are not telling you something or they don't know. People like to gloat and make them selves feel important.

Yes the same as mine.. There is very little cold side piping. I figure hot air moves quicker and will fill the larger length of ic piping easier than cold denser air would. So no doubt running the longer length of ic piping as the hot is the better way to do it.

Mine runs the same as Silver GTS-T, except I have retained the std cross over pipe. Basically the hot air from the turbo runs via the stock piping route then slightly under/behind the fmic core to the drivers side where it enters the fmic. Its easy to do this with my core as the cooler piping enters the core in the center of the core unlike the majority of the fmic's on the market that enter the core at the bottom. The cool air then leaves the core and has a very short route to the cross over pipe.