hypergear
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Everything posted by hypergear
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Anti surge comp cover reduces surge issues, which you are unlikely to see that on a RB20det motor. It also reduces power to boost ratio in some cases. I don't machine surge slots in unless there is a surging problem. -
Few RB20det owners buys a high flowed Rb25det / Neo turbo and replaces their blown Rb20 standard turbos with it. Those high flows are not made for RB20det motors. It will be very laggy. And not so relevant. We usually run a different combination of wheels for RB20det standard turbocharger high flows, those are Rb20det "high flowed" turbocharger results. and For power and response, its not bad for a high flow using stock housings. The current ATR43SS1 per the black back ground read is made for a Rb20det, it makes reaches full boost about 4000RPM, and makes 227rwkws @ 17psi. That is turbo is engineered for a Rb20det engine, that bolt on to your factory manifold, dump pipe, and all lines. My Rb20det dyno readings are limited, Based on SR20det, the response of a SS15 is slightly laggier to a GT2860Rs but more responsive then GT2871R. This turbo is also efficient enough to peek 281rwkws on pump fuel at 24psi internally gated. Taking accounts if installation, response, power to boost ratio, and ability of performance gain on future modifications. This is a my recommendation.
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I will be dynoing the ATR43G4-SAT model on Thursday. Thats is a very good turbo if you are looking for a high powered bolton unit. One thing is you might have to run about 23psi, which is no problem for a Neo motor.
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I can build a SS15 with SS2 turbine wheel and machine your factory GTR turbo housings to suit. Rear wheel is in 11 blades.
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That is the perfect name for that sort of a turbine system. Sure PM for details. Dummy up the bolton version this weekend. I'm had some new actuator brackets locally made, that will mount the actuators above the comp housing instead of on side. That will not only keep the actuation angle straight, but will also making life much easier on installation:
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The new turbo is a little bit different. It is using the steam peddle turbine system that we've been working on since the start of the year. In comparison of earlier models, the approach method of engine's dynamic discharge is more direct. This turns the negative effects of the restrictive factory engineered log manifolds with bottle necks effect positive. Since the swirl is reduced, hot air moves in and out of the turbine side at a faster rate, this makes the use of over sized compressor wheel less likely to chock an engine, this also makes turbo response less sensitive to compressor change as earlier results indicated. This turbo can provide performance of a larger turbo while retain response of a smaller turbo, it does not necessarily relay on externally gated system to make power, and the most important of all, it is simple and cost effective to build.
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Actually, on the late run the IT stayed at about 45 degrees which wasn't too bad. But the pressure drop was still there. I think they've packed way too much fins inside their coolers. But if you are stuck with this cooler and prefer not to have it changed, all you have to do is drill a 1inch whole on both sides of the cooler pippings and bridge them together. That way it should carry 30% of extra flow, except its not been cooled of course. The ATR45 AKA ATR43G4 SAT turbocharger is now released on our site for both Rb25det and Rb26det single turbo setups. They are $900 each to build. I'm working on the internal gate version of that currently. Reaching 350rwkws on pump as a bolt on turbo will be awsome
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I have 64mm comp billet wheels, Those are from ATR28SS15. It peeked 281rwkws, and averaging about 275rwkws pump 98 fuel, on my SR. On dyno it is slightly more responsive then a 2871 while made more power. Orange is ATR28SS15 in .64 rear, Green is GT2871 in .64 rear. Both are S14s with BC Step 2 cams. on pump 98 fuel. Slight boost control issue on that particular day: With boost controller fixed:
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Probably, doesn't make that much power. The last test it made 292rwkws on 18psi after cooler but showning holding perfect flat on 25psi precooler, That should make towards 350rwkws on pump once a proper cooler is installed.
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Developing the SAT model at moment. they should make some where close to 370rwkws on E85 as a bolton turbo, but do make 20psi around 4000RPM.
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Need more Power ?
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You can use your existing compressor wheel and run with our ATR28SS-2 turbine wheels in your current turbine housings. That will drop back pressure, cooler EGT, and makes more torque.
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Yes that is possible. Best supply the raw casting for this application, as other wise it needs to be sleeved before machining.
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Another prototype, this one is made for internally gated XR6 BA and FGs. Unlike the GTX3582, this turbocharger is also fitted with a much larger exhaust wheel working with a big 40mm internal gate. The approximated HP out put on this turbocharger is around the 430rwkws internally gated on pump 98 fuel. Releasing few evaluation units at special prices, PM if any one is interested to trail.
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Rb25 Turbo Upgrade, All Dyno Results
hypergear replied to Nacho Vidal's topic in Engines & Forced Induction
R34 GTT RB25DET NEO unopened engine. - Adaptronic ECU - 1000CC ID injectors - Factory cams and cam gears. - HyperGear ATR45SAT-SRFC (Special edition made to work with restrictive return flow coolers) - Havoc Fabrication 3 inches turbo back exhaust - Walbro 470L/H Fuel pump - 4 inches induction pipe - Split fire coil packs - Internal gated RB25 bolt on. - P98 fuel 292rwkws @ 19psi "after the cooler" Hit 190rwkws @ 4000RPM, Drives very nicely, perhaps another 50kws gain after cooler change. -
Based on the cooler behavior from earlier test runs. I've made another special application turbo: ATR45-SRFC This one is made for the minimum amount of boost drop, making some some where towards the 300rwkws mark on pump fuel. It is a bolton turbo just like the ATR43SS/G series. So this will be your recommended turbo if you you've got this type of intercooler installed chasing similar power levels. Final result of 292rwkws @ 19psi after cooler. Internally gated, P98 fuel.
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Its actually an T2x turbine housing. T2x .64 is the only housing that provides good drive ability working with Rb20det engines. So we made a drawing and worked out a method that modifies a Standard T2x .64 turbine housing into a Nissan Rb Bolton turbine housing with a massive internal gate. That enables us making any RB bolton turbos using any T2x based wheels for better response. The SS1PU for Rb25det follows the same pattern.
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Means the engine is un-opened. Standard cams, standard cam gears, standard pistons, rods, and every thing else.
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It will out perform a 2530 in terms of power with similar response.
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ATR43SS15 runs a .64 rear, 55mm turbine and a 64mm billet comp wheel, which is some thing that we also makes for the SR engines. In which Rb and SRs has some similarities. The SS15 on a worked SR have maxed out at 281rwkws on P98 fuel, which the 2530 can not reach. Either way, the GTRS or the SS15 is made to be an internally gated bolton turbo, and it has to be forgiving on the exhaust side for it to perform, that is not required for an externally gated turbo. Plus been externally gated it would have given a more free flow manifold, gate that also helps in power making. If a high mount system will be used, you can use our Sl20.5 in a 8cm turbine, which will out perform a standard 20G with similar response.
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One more piece of Red top SR20det data. This is using 264 inlet and 272 exhaust. Running our SL20.5 Turbo in 8cm turbine. Car made 477rwhp / 356rwkws on 23psi E85 fuel. Graph running against a Apexi rx6 turbo that was previously installed. Dyna dynamics roller dyno, shoot out mode.
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Fully stock RB20det, bolted on using factory bits. P98 fuel, 227rwkws @ 17psi. ATR43SS15.
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Did a turbo change just making sure that I'm not going to spend money on a new cooler kit for nothing, Now with a ATR43SS-2 on board making no differences to boost drop. New intercooler is getting fitted on the 2nd of April, will update results then. For now, 276rwkws @15psi with cooler restrictions: Also ATR28SS-2 powered S13 SR20det with 264/12mm cams. Final result of 299rwkws @ 22psi, P98 fuel:
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Go for our ATR43SS15 in .64 rear. This turbo is engineered for RB20det engines that makes 20psi around 4000RPM
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No, the Katashi 600x300x100mm cooler had identical readings before and after on my GTR. When I'm trying to make it hold more boost the IT temp jumped significantly and the engine wanted to pin. There are few criteria for this to work on your specific scenario. First your engine compression is about 8.3:1 while standard is 9:1, 2ndly you are running e85 fuel in combination of an external wastegate as well as a welly worked factory exhaust manifold. The spec of this engine as well as fuel used makes it less likely to knock due to rise of IT, if it does, the level of knock would not be as significant that required same or equal amount of timing deduction for avoidance. However working with this specific cooler restrictions I still managed to pull off 300rwkws with it on pump fuel internally gated on SAT configurations. If a free flow cooler is installed, with the current EBC settings, it would be sitting some where around 24psi or higher.
