Meathead

sighhhhhh

Plus the whole Tomei catalog mate. Not to mention OS88 ?? Seriously!! some of you people are seriously misguided.

Hreeeee oink oink

Bit late but your talking out of your piggaz

I think most people are using gtx63s' because one can just machine the housing profile. comp ID/OD 47.1/63.4 mm With the gt60 the comp ID/OD is 47.2/60.1 mm The gtx60 comp ID/OD is 45.7/60 mm so an insert sleeve needs to be fitted to the housing to reduce the inlet diameter to suit the comp wheel which is what I have done. Would cost someone a bit to get this done. The HKS 2530, 2510 and GT2860-5 housings are identical size wise. I did not want any more power just better delivery. Plus I like machining stuff. Garrett require 0.28mm (11/1000") clearance housing to wheel so the clearance will be slightly excessive using a 63 with GT or HKS comp housings. Which might be a good thing anyway with that wheel. I also have 2 x gtx2863 CHRAs brand new and 2 x Skyline compressor housings for GTX2863 also brand new. Both of which I purchased from ATP in the States as I was originally going to fit them but have now gone with GTX2860/skyline housings. I may sell them if anyone is interested.

Found a lot of good unbiased info on the Turbo Forums, good site. the following one about my particular question. http://www.theturboforums.com/threads/287017-Compressor-Housing-Size-Effects-on-Surge-Spool-Up Think i will stick with 0.6 AR and if there is surge (doubtful) then i will re-machine the profiles on my lathe with some 0.42 SS hsgs. Sorry for the thread hijack.

Sorry Discopotato03 you must have misunderstood me. Put simply 2 identical turbos, the only difference the compressor housings (T04B type) one 0.6AR the other 0.42AR . Just wondering about pressure rise rate, heat and capacity. Cheers

Hi Disco potato03, Sorry to thread jump but i was hoping you could help me out a bit with T04B compressor housing A/Rs. According to the Garrett site compressor housing A/R has not much affect, not like the hot end of course. i have some gtx2860r chra's with -5 (0.64A/R) hot ends but need the T04B cold end. was thinking of using some old GTss housings and re-profiling them to suit the 45.7mm/60mm gtx compressor as the GTss inducer is only 44.46mm and there should be enough meat left to profile it. just wondering on the 0.42 A/R and the outcome on boost rate and ceiling. Also i have some old gt2510 T04B covers which would have to be sleeved, tig'd either end and profiled as the inducer is 47.7mm / Ex 60.1mm but the housing is 0.60 A/R. The gtss option is simple but gt2510 a bit more work but can easily be done. I always read your threads and posts as you really seem to know what you are talking about. Appreciate your time and thoughts on this. Many thanks and back to your topic

Looking to upgrade my 5s (2.8) to GTX2860r variety but do not want the disappointment Sean had with the ported shrouds. I see there are quite a few guys with re-profiled -5 comp hsgs for 2863s and no one is reporting any noticeable surge. So I am fairly certain there will be no surge with RB comp hsgs on the gtx2860 as the wheel is pumping less at that PR (max boost start point) and surge line is further to the left than the 63s anyway. ATP sell RB Twin style comp hsgs for the 63 and 67 they did advertise them also for the 60 but removed it after I ordered one only to be informed it was an error. Because the 60 inducer is only 45.7mm and -5 inducer is 47.2mm then maybe the Garrett pre machined casting is already too big to machine for 60s. Drat! My car is putting down 545Hp at all wheels (4wd dynapack) and peak torque is around 4500rpm. I want that peak around 3800rpm using 60s the 63s obviously more powerful but I dont need it. So what I was planning on doing was boring out a 63 RB hsg from ATP (already have it) and shrinking a 6061 ally sleeve in there and re-profile it to suit. Looked all around the web but cannot find any instances of this kind of mod. Anyone heard of this kind of mod.

Boost pressure 145Kpa Inlet valves 30deg back cut not valve seats which are standard.

N1 block Tomei 2.8 kit with cooling channel pistons Ferrea Competition plus Plus valves and collets ..inlet valve seat 30deg cut Tomei 260/10.25 pro cams/ A springs/Titanium valve retainers/Solid lifters/Vernier pullies set up standard specs at the moment. 9:1.0 CR 0.96mm squish squish pads retained Garrett -5s Nismo plenum Standard exhaust manifolds ..untouched HKS Racing Suction and hard pipes throughout...zero surge Standard airbox and blow off valves with 10mm orifice plates recirc to inlet. Trust dump ..full split version HKS catalyzer and super turbo muffler cat back. Trust oil cooler LH side Trust drag R IC Motec M800 J and S knock controller 545PS/HP (408kw) @4 wheels 64.7 kgM (467lbs) Hioku Japan same as 98 RON I guess Tuned at AVO Motec Saitama by Shogo Takahashi Very happy!

Still for sale?

Whats your reasoning for Tomei B springs with poncams. I used A's with 270/10.8 procams for 6 years and 80k kms still like new. Swapped out for 260/10.25s procams now with new A type springs. Cheaper to!

Errr no dude if you use there dual spring set up you need there retainer and spring seat otherwise Ferrea valves and locks are direct OEM replacement Double springs are counter productive for only 1.6 bar boost as are bronze guides for anything but a dedicated track car. Finally had some information back from Ferrea ( took a month) and these valves are fine with OEM cast iron guides in case anyone else wants to use them.

Head and guides are new. Bronze wears quicker and car is tracked only 4-5 times a year. I would if I was flogging it every weekend or it was a dedicated track car but in my particular situation cast iron is more robust and longer lasting. Just need to know if any galling/micro seizure occurs with this nickel stainless steel alloy valve and the cast iron guide. Apparently pure stainless galls in cast iron guides. Appreciate you comments anyway

I have a new rb26 cylinder head going on during a routine overhaul and will be fitting Ferrea Comp+ valves. Ferrea do not supply guides for rb26s. ( I have checked) Just wanting to know if anyone has had any issues with these valves and OEM cast iron guides? Also using new OEM retainers and locks and spring seats with tomei lifters and procams. cheers

Hello Bobby, I am very interested to know what you did to make it stand alone. I think my original was left to run Atessa with the TPS signal. Realise this all costs money and am more than willing to pay for a wiring diagram and the additional MotecM800 setting. All the best with the car Mike

Great effort you must be chuffed! Regarding your M800, did retain the original ecu for anything minor or has it been removed completely? I ask this as I have been running both for the last 6 years. The workshop that fitted/tuned it said it still needed both at the time. Fantastic car anyway and all the best with it.