LaurelPWR

Sorry mate...my bad. LOCATED GOLD COAST WILL POST ANYWHERE AT YOUR EXPENSE.

Good morning lads. Would anyone be interested in a brand new: Garrett Ni-Resist Turbine Housing, T3 GT30R Series, Split Pulse/Twin Scroll, V-Band (3.0" Discharge), 1.01a/r Turbine housing... Suits the Garrett GT3071R (60mm/84 Trim only), GT3076R, GT3082R, GTX3071R, GTX3067R. Also comes with V-Band clamp, locking plates, bolts and a T3 mounting gasket. Reason for sell is because I need a t4 flange housing [emoji57] It's never been run or used but had been test fitted to a brand new hta3076. $800

^^49mm bored out throttles with new 49mm oversize butterfly's, cnc port matched nismo plenum & cnc cut plate to match the new centres of the throttle bores that will be welded to the rb25 runners ^^finished cnc machine work inside the nismo plenum. The origional ID's inside the nismo plenum runners are 43mm from the bell mouths all the way to the last 10mm before the throttle, then it tapers to 45mm. I've had the runners cut to 46mm from the bell mouths, but then started the taper from halfway along the runner which tapers out to 49mm to match the throttles.

*rb25de neo head

That's a matter of personal preference my dude. I personally love the snappy on/off throttle response I get from them. It was a nice upgrade from the forward facing "Greedy" plenum and also surprisingly increased boost response. Another thing is, I don't know any other car in the world running an old GT28/29 frame, internal gate turbo making the figures I make so I strongly believe they help me achieve that also. So yeah they have cost me a lot and continue to do so, but to me it's well worth it haha As far as room to work on them goes, well rb's are mounted north/south so naturally they would be a s h i t l o a d easier to work and because mine are in an s13, my strut towers are further away from the motor (s chassis McPherson strut VS unequal double A-arm R chassis) so I may have a little more room again to access them over a skyline. Then if I compare to the factory rb25 intake manifold... NO COMPETITION AT ALL haha You can't hardly access the injectors and a few other sensors on the factory long plenum because of its curl-over long runner design. Then add the fact that the throttle body sits smack bang in the middle of the plenum, feeds from the cooler cold pipe that goes up past the top of the turbo, over the rocker covers... just to chance plugs and coils you have to pull half the intake system off... Give me throttles over that any day haha. Easier, snappier, faster for a given purpose.

Yeah man I just received my 49mm throttles from them last night [emoji87][emoji12] They only offer a 48mm service though...they like to keep a minimum 1mm of housing "meat" between the inner bore wall and the shaft bearings on each end of each set of throttles...but after a long phone call explaining that there's other company's that offer 49mm service albeit for a higher cost, I convinced them to go to 49mm and they do it by moving the centre of the bore inwards .5mm to retain the 1mm of "meat" at the shaft bearings. I would post pics but I went and dropped them off at the machine shop with a nismo plenum to get the plenum cnc port matched to the throttles. I don't need the injector plate machined as I run the throttles on my rb25 using a custom made adapter that used cut and shut lower rb25 runners which are 50mm ID. Will be interesting...

The whole single throttle more power thing is a myth... I believe both single & itbs have their individual uses and purposes so it's not something that really can be compared. Not to mention there's the car in the article above built by Top Secret running itbs making well over 900hp... But anyways that's an argument that could go on and on hahahaha So yeah, aside from all that, I kinda just really wanted to know if anyone on here has actually done it.. I've always seen it as one of those glamorous mods that is there for the high end and elite types and big workshop builds.. Would be cool to hear from just a lad who decided to take the plunge on it. But as said above^ it's normally done with a whole host of other high end fruit so probably never going to see a before and after but it's worth a shot asking (:

Hey lads, As the title states, RB26 oversized 45-49mm throttle upgrade... The best known company that offers this service is NAPREC in Nagoya, Japan. I believe it's around $1.2k+postage and tax and also (if you use Streeter) Streeter's postage fees and commission etc. And that's just for the throttle machining and rebuilding and you have to supply your own set of throttles. Then you need the 50mm gaskets.. more $$ NAPREC link: http://www.naprec.co.jp/product/t001 There is also the Garage Ito option which is cheaper but still $1100+postage+gaskets etc. etc. and you still need the set of throttles to send them. Nengun link: https://www.nengun.com/garage-ito/rb26-big-throttle-body Interestingly enough, HyperTune now offer their itb intake manifolds with the 49mm oversize runner option to mate with NAPREC throttles. Both company's promote each other in regards to these products now too. NAPREC link for HyperTune plenum: www.naprec.co.jp/product/rb26dettサージタンク There's also this Facebook post I saw with what I assume is a customer of Top Secret and someone who has done the upgrade. I'm not 100% if these claims are of the oversized throttles and the plenum combo or just the 49mm runner plenum...Anyways he's claiming around a 40ps gain from the upgrade which I think (if at all true) is actually a pretty substantial gain for an intake mod... Here's the link: https://m.facebook.com/masahiro.takemura/posts/921436694600562 And a screen shot of the link: Some more screen shots of the products in question: So, has anyone on here actually done this mod or know of anyone with first hand experience on this and that has done the 49mm itb's ? Would love to hear and or see some graphs or real world results.

Yes let loose is the key words... 20-30psi should do [emoji1362]

I would assume they have plans for G30 sizes... Here's hoping these G25's do what is claimed... And If so, could it be too much to hope for a G30 type to produce 400-700hp [emoji848][emoji848]

[emoji848][emoji848]not bad at all... I would be willing to be the guinea pig and give it a go if i hadn't spent a heap on this new hta3076 twin scroll sitting here [emoji57]

I'm keen to see what pricing will be like....

What's Dico got to say on the matter?

Yeh... every time Garrett bring something new you the table, I little voice in my head says "it still looks nothing like an FP or EFR" haha

Looks like Garrett might finally be catching up haha

What is this new sorcery¿ Facebook screen shot: https://www.turbobygarrett.com/turbobygarrett/turbochargers/g-series-g25-660

Dropped these to 5psi tonigh for roll racing and still getting the odd wheel spin on launch and change to 3rd haha

Thanks man (: It's very responsive having 240kw at 4krpm makes for a very fun street car indeed.

Update for my setup.... Same mods: Motor was rebuilt around 15k km ago with arp rod bolts/head studs acl bearings treated and prepped oem rods and crank Ross forged Pistons 1.2mm cometic gasket Tomei poncams Brand new oem lifters performance springs Apexi power fc turbosmart eboost2 R32 gtr itb's 4 inch hard intake pipe with apexi pod & z32 afm Cusco plumb back air oil separator splitfires Quest 125A alternator 740cc nismo injectors walbro 460 pump HKS 2835 Pro S 56T 0.87ar Turbosmart internal gate actuator hpi turbo manifold, exhaust special hks 2835 pro s dump pipe into a genuine hpi split front pipe into straight through 3 inch exhaust with no mufflers or cat etc...... Runs United E85 24psi Some small mods to my actuator yielded better spool, response and held boost stronger resulting in a 15hp better peak and 100hp gain at 3700rpm It's a blistering setup and an almost unbeatable street car being a light weight and highly tuned semi stripped s13 chassis and even my 315/30 nitto Nt01's can't get the power down anymore haha Responsive!!!!

Thanks Lith [emoji4] Would be interesting to see this setup with an external gate set up now [emoji848] But that won't be happening haha Now I'm just hoping my new hta3076 twin scroll setup can give same sort of response and a father mid/top end power band

SO......., It turns out the actuator bracket wasn't fixed stable and had movement when the actuator was loading and unloading boost... The noise it was making in my last post above was the internal gate flapper rattling around in the breeze at idle [emoji17] Because the actuator itself was moving around, the gate preload was changing or being lost altogether. I ended up welding the actuator brackets together to eliminate any movement and then I cut the linkage down and loaded a bit more preload and back to the dyno today. It now makes boost earlier than it ever has, made 20ish more peak HP and picked up 100hp at 3700rpm For a turbo of this size, it's quite a stout result and I now feel it's performing like it always should have... Remembering it's the .87 ar rear as opposed to all other 2835 pro S results on rb25's are .68 ar The car feels much faster on the road now and even my 315/30 nt01's can't cope anymore with this small but decent gain hahah [emoji4]

Picked up a second hand nismo for $1400. Thanks heaps for the offer tho mate (: Admin close thread please

Here's a video of the noise in the specific area and then the noise through the diy "stethoscope" .. waste gate noise.MOV

I did another boost leak test last weekend as my usual preventative maintenance... I normally put my "tap" tool into the start of the cooler hot pipe directly after the compressor outlet... But for a change I pressurised the compressor as well this time.. I put the "tap" at the statue of my air intake where the air flow meter normally goes and then put the usual 30-35psi through the system with my compressor and controlled via twin regulators and than spray soapy water on everything and look/listen for the bubble.. I found that the screws that hold the comp housing to the backing plate are leaking through their threads as the threaded holes go all the way through to the inside of the comp housing. I removed each bolt one at a time and liberally put some loctite 567 heigh pressure thread sealant on each one drove them back home... Retested and Problem solved. No leaks anywhere else. Then I checked and Re-tightened my four t3 flange bolts just to be sure (one was a little loose for my liking), hosed all the soap off and started the car to dry out the engine bay. This is when I noticed a strange reverberating, tinny, rattling sort of a noise at the dump/front pipe area... I had always heard a similar noise from that area since the HKS 2835 pro S went on the motor and always just assumed it was engine reverberation noise caused by the stainless HKS dump and Hpi stainless front pipe that went on at the same time as the turbo swap...my previous exhaust on the previous turbo was mild steel from turbo back.. I used a large screwdriver and long piece of aluminium angle as a stethoscope and located the exact location of the noise and turns out its coming directly from the internal waste gate mechanism... I'm guessing the gate poppet isn't fully seating and rattling around in there hahaha.. As seen earlier in this thread, I replaced the actuator with a bew turbosmart unit and put 21psi Springs in it and pre-loaded the f**k out of it to get it to maintain some sort of boost and get a tune happening... Now I finally think nice located the issue!! Dump is coming off hopefully this weekend and I might get to the bottom of this once and for all!!