RS500

MrPrez, how are things going with your GT30 turbo setup? fyi, i am also in the middle of mucking around with a 600hp Garrett GT30 (700177-0014 core) which i bought off a friend (turbo was meant for someone else) for my cossie 2L. After the initial tests, i wasn't very happy with it (due to small exhaust housing - A/R .48) as we were getting heaps of back pressure in the exhaust housing which was killing power up top, although the mid-range looked nice. given this, we're now waiting on the A/R .82 housing, so i'll let u know how i go. i'll be interested to see how you go with your GT30 (A/R .63) on a 2L. cheers, RS500

dude, the wheel specs of the turbo plus the fact that it's running a A/R .63 exhaust housing definitely will not allow it to flow 530hp. Steve, also, the comp map on Ray hall's page shows that it would flow the 35-40lb/min worth of air with a larger A/R comp housing given the slant of the efficiency island. with the A./R .50 on this one, it would be more efficient at higher boost but it will probably only flow up to 30lb/min which would equate to ~300bhp.

just my 2c, we all know that on the HKS Japan website, they claim that the RB26DETT (with GT-SS turbos) makes 422kw (574ps) @ 7070rpm on 1.4kg/cm2, although has anyone noticed that the engine capacity of the RB26 has been increased to 2628cc over the standard 2568cc along with the 264/264 cams? Also fyi, the wheel specs on the SR20DET GT-SS differ from the RB26DETT GT-SS where the SR20DET spec GT-SS has slightly larger wheels and an A/R .60 comp housing compared to the A/R .42 on the RB26 spec GT-SS. http://www.hks-power.co.jp/products/turbo/...ss/ac_gtss.html personally, i don't think the GT-SS (for the RB26) is rated at 320ps, i believe that it is a marketing thing and that it really is rated at the original 280ps. again, this is just my 2c, so think of it what you will.

dude, PM me if you're in melb. i wouldn't mind checking out a couple of your things.

Dennis from P.E.T Mods is very good when it comes to tuning RBxx engines.

Sydneykid runs these coolers on most of his cars which are making b/w ~230rwkw to 280rwkw and he seems to swear by them. maybe u shuld send him a PM.

dude(groove32), i already mentioned the HKS GT2540 to you. HKS rate them at 350ps, and state a power level of 250kw (340ps) at the engine on 1bar on an RB25DET. see below http://www.hks-power.co.jp/products/turbo/...c_gt/ac_gt.html Turbo Tits, you should refer to the link above also, as HKS officically state that the GT2535 (also on a RB25DET) makes 240kw (327ps) at the engine, so i don't think it will have the 'minerals' to make 220rwkw on an RB20DET with 1-1.2bar of boost, even if at all.

fyi, a guy with a R32 GTS-T and HKS GT2535 had his car on my friend's dyno where it only made ~190rwkw on about 25psi, so i don't think they're all that great for top end power, although the mid-torque was pretty nice.

let's take this to PM.

i believe the HKS GT2540 (350ps) should do fine in single form for a RB20. if you're interested, a friend is selling one to suit the RB20/25.

fyi, both the GT30 & the GT35 are of the 'new GT design' and share the same compressor wheel, where the GT35 has a larger turbine wheel. given this, the GT30 would spool quicker the the GT35 if the same size turbine housing was used. btw, how much power are u after? the reason i ask is that two GT35's (rated at~600hp each with .63 housing) on a RB26 would be pretty laggy for normal street use, but then again, it all depends on what u want & need.

STeg33, the GT30 option which i mentioned above is actually the smallest in the GT30 range, and if you do your research, you'll find out that it has the same turbine wheel as the HKS GT2835 and the same compressor wheel as the 450ps HKS GT3037S. i know of an R33 that had one of these, and it was very nice to drive with heaps of response, mid-band torque and good power.

Steg33, if you are after a new turbo that will give u your 250rwkw with nice response and don't mind fabricating a new dump, etc, i will have to recommend that you go for the 475hp Garrett GT30 with the A/R .82 exhaust housing. Specs are as per below; GT30 (SB8005A - 700177-0011); Compressor; * A/R 0.70 housing * 52 Trim T04S wheel (2.17"/3.00") Turbine; * A/R 0.82 housing * 90 Trim (2.11"/2.22") More details and specs to Garrett turbos can be found at the link below. http://www.turbofast.com.au/GTseries.html

hi all, as i've been informed that i forgot to mention, the turbos were recod and built with 360 degree competition thrust bearings as to ensure turbo strength and longevity. Also, price change, he now wants $2k for the whole lot or $1600 for the turbos and cast dumps alone.

INASNT, fyi, i believe the 180sx which you are referring to had the A/R .73 exhaust housing on his HKS GT3037S. btw, i have the dyno chart of that 180sx when it made 301rwkw, so i'll try to post it if i can.

gtargh, check this out and PM me if interested, http://www.skylinesaustralia.com/forums/sh...ead.php?t=26097

Price Change.

FAT32, by the sounds of it, you're not looking for too much power out of your engine so forged pistons aren't really required for your application, although if you're looking at going for the added strength and reliability in forged pistons, then while you are there, i would recommend going for oversized pistons (80 or 82mm) as this will give u an increase in engine capacity (up to 2.2L) along with an increase in torque and power. check this website as it has some info on this along with RB20/24 strokers (using RB26 crank & rods), etc. http://www.meggala.com/nissanrb3css.htm

i am of the belief that longer runners in an exhaust manifold will actually make for a much more aggressive build in boost. this was seen when Ford/Cosworth desinged the longer 2 piece exhaust manifold for the Ford Sierra Cosworth RS500 back in '87. maybe Sydneykid can confirm/deny this. only my 2c.

why don't you try Mark from Banzai Motorsports; Email:[email protected] PH: (07) 55294621 Mob: 0405 183215 i know that he has both the HKS GT3040 and a HKS GT3037 Pro S (T03 flange with internal wastgate).

why would you want to put a T3 compressor wheel into your turbo while it's being rebuilt/hi-flowed? and, that sounds a little pricey for that wheel combo u state.

you can also give Dennis at P.E.T Mods a call on 0425 799984 or (03) 9464-4225. he has done a couple of these with good results on a VL and a skyline. tell him Gorjan (RS500) referred you and he'll help you out.

It would depend on what specs the turbo is, but yeah, if you pick the right combo, it can be heaps of fun Although, with a larger turbo and higher boost, you'll definitely have to pay some attention to the fuel system, otherwise the motor will go BANG!!! //RS500.

Mack, hi-flowing the RB25 turbo will cost up to $2k, where you can possibly get a brand new Garrett GT25 for about that and then sell off your RB25 turbo. if you're interested, a friend of mine is looking at selling his HKS GT2540 (inc. uprated HKS actuator). PM me if interested.

i'd go the Garrett GT25 (446179-0032) turbo assembly. It is rated at 400hp, and would be quite streetable with plenty of flow. http://www.turbofast.com.au/GTseries.html