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I've built a a pair for Chequrered tuning's LS1 V8, that is mainly getting the advantage of running extra timing for the high comp V8. I'm awaiting on the manifold for my GTR, So I don't currently have a result for this particular turbocharger. Are you looking for some thing that suits a Rb20det?

How ever I have do have an result using the exact same compressor and turbine, except been in a VNT housing. You can reference to the ATR43SS4-Alpha model. That would give you an approximate peek power and boost to power ratio.

While I'm in here, I have twin GT-RSs on my RB2630 and the rear wheels are choking it up top, is there an option to fit a bigger turbine wheel ?

Just a quick update. I'm in the process of making a 55mm exhaust wheel for SR20det motor. That is a mm a side bigger then your GTRs turbine all around. I will doing some evaluations ready, they should be the solution for your current issue on the Rb2630 and pickup more mid / top rang torque also.

Haha oops, for some reason I thought they where 11 blade, was thinking of something else :/

How long till you start doing these and what would be a guesstimate of cost to rebuild two turbos with these wheels ?

Grinding shaft at moment, probably two weeks away. If you wish to send me the compressor wheel I can definitely build them with the new exhaust wheel.

Some updates. Those are videos sent in by John Reco, fastest lap SAU VIC track day last week. Fastest lap:

fronts.jpg
Hypergear 21U highflow turbo on standard manifold
Havoc custom pipework and exhaust
Chequred Tuning 300kw responsive tune E85
Motul Fluids 8100 15w50, Comp Gear Oil & RBF600
Tyrepower Frankston wheel alignment
4.3 Diff gears
285/30 R18 Yokohama Neova AD08R

  • Like 1

Should be able to customize turbine housings. Depending on what sort of car it is for.

comps.jpg

Further development into the ATR28SS Alpha Series based my S14 with a SR20det motor using BC S2 cams.

This is a base line for CBB SS2 Alpha version, Vnt is not current engaged. Final result of 302rwkws on 24psi P98 fuel.

power.jpg

boost.jpg

SS2 Alpha Base line compare to Standard SS2:

ss2vspower.jpg

Makes the same amount of power, but is slightly more responsive.

ss2vsboost.jpg

Base line Vs Garrett GT2871R in .64 rear:

powerv2871.jpg

boostv2871.jpg

Its currently making 190rwkws and 21psi @ 4000RPM. It drives pretty good the way it is. The goal would be matching the GT2871 curve without losing any top end.

  • 2 weeks later...

So I am helping someone make their RB25 Skyline go a bit quicker, so after much discussion the choice to go with an ATR43-SS2 was made - as soon as we nut out how to best pay across international borders we may have the first Hypergear turbo on NZ soil that I am aware of. Looking forward to checking one of these things out in person after all the discussion, and will be nice to have first hand experience of the SS2 :)

If I'm allowed I'll post results after we are done with it - will be internally gated, stock manifolds all around, BP98 on a stock internal RB25.

  • Like 1

Firstly sorry for being lazy. But what is the best direct bolt in turbo for an R33 gts on E85 shooting for around 400rwhp with as much response as poss. Or is it worth going external gate and or big dump?

Depending on how lenient the dyno is he will be getting about 340-370 hp around there, varies alot with dyno's.

Thats at 16-20 psi

I'll be tuning the internally gated one on BP98 with a Dynapack hub dyno, probably not as tough an audience as you guys are overall used to - though similar to some. Will probably go for around 18psi, but will see how knock limited it is and decide whether to go higher from there.

SS1PU Internal Gate will do it, I personally prefer to run an external gate because you can sneak in more timing

Thanks

Is the ATR43ss2 a lot bigger or ok for what I'm looking at? Don't mind going external gate, prob off exhaust housing.

This is for a track car.

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This is a huge worry for me, because my car is relatively low mileage (only 45k km when purchased) so although I plan to own the car for a long time, a mismatched odometer reading would be hugely detrimental to resale should the day come to sell the car. Thankfully this only occurred a mile or two from home so it wasn't extremely significant. Also, the OCD part of me would be extremely irked if the numbers that showed on my dash doesn't match the actual ageing of the car. Diagnosing I had been in communication with the well renown GTR shop in the USA, U.P.garage up near University Point in Washington state. After some back and forth they said it could be one of two things: 1) The speedometer sensor that goes into the transfer case is broken 2) The actual cluster has a component that went kaput. They said this is common in older Nissan gauge clusters and that would indicate a rebuild is necessary. As I tried to figure out if it was problem #1, I resolved problem #2 by sending my cluster over to Relentless Motorsports in Dallas, TX, whom is local to me and does cluster and ECU rebuilds. He is a one man operation who meticulously replaces every chip, resistor, capacitor, and electronic component on the PCB's on a wide variety of classic and modern cars. His specialty is Lexus and Toyota, but he came highly recommended by Erik of U.P.garage since he does the rebuilds for them on GTR clusters.  For those that don't know, on R32 and R33 GTR gearboxes, the speedometer sensor is mounted in the transfer case and is purely an analog mini "generator" (opposite of an alternator essentially). Based on the speed the sensor spins it generates an AC sine wave voltage up to 5V, and sends that via two wires up to the cluster which then interprets it via the speedometer dial. The signal does NOT go to the ECU first, the wiring goes to the cluster first then the ECU after (or so I'm told).  Problems/Roadblocks I first removed the part from the car on the underside of the transfer case (drain your transfer case fluid/ATF first, guess who found out that the hard way?), and noted the transfer case fluid was EXTREMELY black, most likely never changed on my car. When attempting to turn the gears it felt extremely gritty, as if shttps://imgur.com/6TQCG3xomething was binding the shaft from rotating properly. After having to reflow the solder on my AFM sensors based on another SAU guide here, I attempted to disassemble the silicone seal on the back of the sensor to see what happened inside the sensor; turns out, it basically disintegrated itself. Wonderful. Not only had the electrical components destroyed themselves, the magnetic portion on what I thought was on the shaft also chipped and was broken. Solution So solution: find a spare part right? Wrong. Nissan has long discontinued the proper sensor part number 32702-21U19, and it is no longer obtainable either through Nissan NSA or Nissan Japan. I was SOL without proper speed or mileage readings unless I figured out a way to replace this sensor. After tons of Googling and searching on SAU, I found that there IS however a sensor that looks almost exactly like the R33/260RS one: a sensor meant for the R33/R34 GTT and GTS-T with the 5 speed manual. The part number was 25010-21U00, and the body, plug, and shaft all looked exactly the same. The gear was different at the end, but knowing the sensor's gear is held on with a circlip, I figured I could just order the part and swap the gears. Cue me ordering a new part from JustJap down in Kirrawee, NSW, then waiting almost 3 weeks for shipping and customs clearing. The part finally arrives and what did I find? The freaking shaft lengths don't match. $&%* I discussed with Erik how to proceed, and figuring that I basically destroyed the sensor trying to get the shaft out of the damaged sensor from my car. we deemed it too dangerous to try and attempt to swap shafts to the correct length. I had to find a local CNC machinist to help me cut and notch down the shaft. After tons of frantic calling on a Friday afternoon, I managed to get hold of someone and he said he'd be able to do it over half a week. I sent him photos and had him take measurements to match not only the correct length and notch fitment, but also a groove to machine out to hold the retentive circlip. And the end result? *chef's kiss* Perfect. Since I didn't have pliers with me when I picked up the items, I tested the old gear and circlip on. Perfect fit. After that it was simply swapping out the plug bracket to the new sensor, mount it on the transfer case, refill with ATF/Nissan Matic Fluid D, then test out function. Thankfully with the rebuilt cluster and the new sensor, both the speedometer and odometer and now working properly!   And there you have it. About 5-6 weeks of headaches wrapped up in a 15 minute photo essay. As I was told it is rare for sensors of this generation to die so dramatically, but you never know what could go wrong with a 25+ year old car. I HOPE that no one else has to go through this problem like I did, so with my take on a solution I hope it helps others who may encounter this issue in the future. For the TL;DR: 1) Sensor breaks. 2) Find a replacement GTT/GTS-T sensor. 3) Find a CNC machinist to have you cut it down to proper specs. 4) Reinstall then pray to the JDM gods.   Hope this guide/story helps anyone else encountering this problem!
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