hypergear
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Greater amount of energy is required to turn larger wheels up to speed, there for laggier. However bigger wheels are capable of flowing greater amount of air through both housings, let the engine burn more fuel and makes more power that way. -
We've been working on all sort of different types of turbos with majority of work load shifting towards Euros in the last few years. The Skylines are more of a hobbie then a daily, at least its like that in Australia. I will update photos from some of our latest RB jobs. Whats recent is G30 turbine housing externally gated plumb back kit using T3 .83 geninue housing. It can be made to suit G35, G40 and G42 units. External gate optional.
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rb25det HyperGear vs Pulsar Turbo RB25DET
hypergear replied to Eric0's topic in Engines & Forced Induction
Copies. Their results I'm not going to say idential but very close to geninue -
rb25det HyperGear vs Pulsar Turbo RB25DET
hypergear replied to Eric0's topic in Engines & Forced Induction
Sorry I don't agree, at least for the G30-770/900, The G30-660 isn't far off to a 700 response wise and doesn't make as much power. Referring to my last few dyno runs from Rb30det. Power and response of the two G series tested were no where near to the current model ATR43SS-3. But I respect everyone’s preferences. Free data for everyone who’s interested to know the performance ceiling of those two G series turbochargers. All three turbos run to a point that no more power could be made / no more boost could be held. Everything else apart from the turbo stay unchanged. -
The SS-2 made 317rwkws V 21U G3 high flowed made 282rwkws at a point that no more power could be made on a built RB25det Neo motor on P98 / Ron 93 fuel. 21U high flow is about 400RPM more responsive making 20psi by 3600RPM, while SS2 made 20psi by 3800RPM. High flowed Rb25det turbo drives very similar to stock turbo. My recommendation is still ATR43SS-2 in T3 .71 rear housing with ball bearing core, as it has stronger power delivery with higher power capacity.
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ATR43SS-1 is better suited for a RB20det engine. SS-2 is suited for a Rb25det engine. Externally gated kit is highly recommended as it makes more power on less boost pressure with higher power ceiling. I've attached an example of our high flowed OP6 turbocharger running both internal and external gate. Turbo is boosted to a point that no more power could be made. Car's an R33 with built Rb25det engine.
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Engine efficiency issue?
hypergear replied to ChrisW434's topic in R Series (R30, R31, R32, R33, R34)
To get the most out of the car, you will need to external gate it. Plumb back just doesn't work. And even externally gated, by adding an additional cutout pipe to the dump pipe made a huge difference at this power level. Remember the my test car had a 3 inches cutout pipe in the dump working with a 3.5 inches exhaust and two 40mm external gates. At a point when you are be able to rise the inlet boost pressure that makes no power gain is usually due to an restriction on the hot side of the turbo setup, that also causes boost pressure to fall up top as greater volume of flow is required maintain boost pressure per crank revolution increases. Stock cams shaft was getting pretty maxed towards 450rwkws, it needed alot more boost to gain additional KW at that point. I would put steps 1 cams in if I was doing it all over again. Dyno makers are annoying, all clamed making the most accurate dynos in the world, and none of them agrees on power/torque/speed formulation, that causes issues on end users. If roller dyno was used, you probably see a lower figure due to traction and load. If it was on a Dyno dynamic dyno, you would likely be seeing a much lower figure, that is due to formulation of the dyno software. -
Correct
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SS3 has very similar to a SS2. It needs to be externally gated for boost control. Performance wise about 60kws more in comparison.
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Yes correct. Link is at: https://hypergearturbos.com/product/atr43ssiwg/ SS2 Profile, T3 .71 Turbine housing, Ball bearing upgrade, and oil line kit. Thats pretty much it.
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Assume the application is for internal gate. Far as internal gate concern SS-2 makes around 300rwkws on P98 fuel in either .63 or .71 turbine housing. Response are about the same between the two.
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Hi I found G25 turbine is too small for a Rb25det motor. I recommend our ATR43SS-2 in T3 .71 turbine, its very similar to a G30-660 with better response. Its supplied as a brand new turbo internally wastgated.
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Updating results. Using ATR45SS-0 model VS UHF57-900. Those two are very different turbos, different wheels sets with different wheel hub profiles but yet with almost identical result. I’m intrigued with both turbos performance. ATR45SS-0 was a 61mm turbo first developed in May 2020, UHF57-900 was a 62mm turbo developed in March 2024 as a powered up alternative of a G30-900. On paper ATR45SS-0 maxed at 563rwkws, while UHF57-900 maxed at 568rwkws. ATR45SS was slightly more responsive with slightly better power band through the mid range. Road driving ability, ATR45SS-0 had better throttle response, felt more robust under throttle, as it wakes up earlier. I think G series wheel hub design made it to have higher inertia under light throttle. Doing bit more prototype work in the next few weeks, will update result when its back on dyno again. ATR45SS0 Blue, UHF57-900 Red Chequered tuner's Dynapack hub dyno, E85 fuel. Mod list is in video below video_20240604_114214.mp4
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The housing it self made minimum differences, while the exhaust manifold made a difference. 6 Boost T3 divided will do fine. ATR43SS3ProR model in T3 .82 rear (TS optional) from March 25th will be more then capable of 450whp with excellent response.
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T51R mod is an Antisurge slot. With exception that it has few extra legs on the base of it which makes a sound, and it needed to be inserted into the comp housing.
