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Everything posted by hypergear
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I was referring to stock rb25det manifold. The twin gate setup, I found its dependent on the types and shape of turbine wheel as well as size of housing used. I will conduct some experiments later in the year and upload results.
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Why should twin scroll exhaust manifold and housing make slightly better response. It very dependent on the design of the actual exhaust manifold and of course the firing sequence of the engine. Lets take Rb25det with firing sequence of: 1 5 3 6 2 4 Stock twin pulse log manifold consist bank 1 of: CYC 123, and bank 2 of: 456. So the split plus ensures the combusted air shoots straight into turbine housing rather then towards the other side. I've seen customers drilling out the center divider of factory exhaust manifold result in lose of response and power. I'm currently using a merged pulse external gate on a factory exhaust manifold, and by doing that I have lose about 300RPM of response, I think it would partly contributed the this problem and the extra volume external gate plumbing has made up. Same principle apply to a spaghetti manifolds, but I found its not as tangible as the runners are separated that ends up in a collector. So there will be a bit of a differences assume a properly made twin pulse, twin gated exhaust manifold used on the right size twin pulse turbine housing. The advantage of twin gates giving extra flow would mean you can use a smaller housing on a turbo that makes the same top end as a big housing while avoiding the lag.
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I can supply a .84 rear housing in twin scroll. It won't be as responsive. If you have a twin pulse twin gate manifold, you can use the .63 single housing with an ATR45SS-1 to make 450rwkws+ while still have similar response as above.
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Get a PWR 600x300x81mm cooler or Aero flow to save few coins, General pod filters, Tomei dump pipes, 3 inches front pipe, 3.5 inches 100 cell cat with 3.5 inches cat back exhaust. Turbos I would high flow them to -9 specs with 14psi actuators. I'm not sure about stock R32 ECU, but R33 ECU supported just under 300awkws on that setup on 98 fuel.
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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 refreshed engine HyperGear ATR45SAT Turbocharger ID 1000cc injectors Walbro 525L fuel pump Haltech ECU Greedy Profect B EBC 600x300x100mm Cooler kit 3.5 inches turbo back exhaust 4inches intake pipe with Pod Split fire coil packs Turbosmart 45mm external gate welded on exhaust manifold. Car made 420rwkws @ 25psi, E85 fuel. Hitting 240rwkws / 20psi by 3800RPM. -
New result to share. This is an ATR45SAT ball bearing bolton turbo running of an external gate from factory exhaust manifold. Car is an R34 GTT with a freshed up Rb25det NEO engine. Car made 420rwkws @ 25psi of boost E85 fuel, 240rwkws @ 4000RPM, Nice and responsive.
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Yes. But the rolls are narrower, the fins are closer packed. It did not flow or perform as well as the cheap replacement, That was later replaced with a PWR cooler.
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About factory GTR intercoolers. My 1998 S3 R33 GTR with factory cooler, boost curve: Cooler changed to Takashi (not the best) 600x300x100mm with no other changes: Compare the two coolers: inside new cooler: inside stock cooler: I'm unsure of other GTR models, at least factory R33 S3 GTR front mount cooler is quite restrictive.
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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 Stock engine HyperGear ATR45SS Turbocharger ID 1000cc injectors Walbro 525L fuel pump Power FC + Z32 AFM Greedy Profect B EBC 600x300x81mm PWR Cooler kit 3inches turbo back exhaust 4inches intake pipe with Pod Split fire coil packs Turbosmart 45mm external gate welded on exhaust manifold. Car made 400rwkws @ 24psi, E85 fuel. Hitting 20psi by 4000RPM. -
ATR45SS Rb25det NEO round 2 with fuel pump issue sorted. Now pulling 400rwkws at 24psi on E85 fuel. Car mods are listed in video below: https://www.youtube.com/watch?v=hrVjIMxIFrA
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The biggest you can fit using air box would be 3 inches, I would prefer a short 4 inches metal pipe in between. that provides better throttle response over 3 or 2.5 inches. Actuators, something 14psi or one of our high pressure actuators will do fine.
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Nice result. The pressure drop would mainly be restriction on cold side. A FMIC with a better cooler, 4 inches metal intake and free flow exhaust should see another 10~15kws gain.
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further update with prototype ATR45ss turbocharger. Car made 364rwkws before running out fuel.
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The 53.8 in 47 ex would be the best turbine wheel for SR20det, run that in T2 .61 turbine housing externally gated.
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One more result to share: Rb25det NEO Stock engine HyperGear high flowed Turbocharger ID 1000cc injectors Walbro 460L fuel pump Power FC + Z32 AFM Greedy Profect B EBC 600x300x81mm PWR Cooler kit 3inches turbo back exhaust 4inches intake pipe with Pod Split fire coil packs Turbosmart 45mm external gate welded on exhaust manifold. At higher boost level we've reached 340rwkws before experiencing ignition break down. https://www.youtube.com/watch?v=Mgz8Wzyc6X0&t=6s
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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 Stock engine HyperGear high flowed Turbocharger ID 1000cc injectors Walbro 460L fuel pump Power FC + Z32 AFM Greedy Profect B EBC 600x300x81mm PWR Cooler kit 3inches turbo back exhaust 4inches intake pipe with Pod Split fire coil packs Turbosmart 45mm external gate welded on exhaust manifold. At higher boost level we've reached 340rwkws before experiencing ignition break down. https://www.youtube.com/watch?v=Mgz8Wzyc6X0&t=6s -
More video to share. This is an R33 GTST powered by one of our ATR45SS1 turbochargers at Hitec drift last weekend. Car's currently making 401rwkws on E85.
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The SL205 makes the same power as a 25G with better response. If your current turbo is not blown I can have that modified to the same specifications as the 20.5 with a 10cm with turbine housing supplied for less then half the cost of a new turbo.
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It acts as a normal anti surge slot. There is a lose in compressor efficiency. I did a comparison years ago result is in this thread. There was a lose of 300RPM and 11kws with that particular turbo used.
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Looking to spend $500 to do that sleeve insert. One more Tuning video to add. This is one of our ATR43G3SAT Rb bolton models. making 324rwkws on E85 fuel internally gated. Car's an R33 GTST with: Stock RB25DET Stock intake manifold with FF throttle body conversion FMIC Hypergear ATR Series bolt on turbo with IWG Stock exhaust manifold 3" TBE Aeroflow top feed fuel rail conversion and Bosch 1000cc injectors Walbro 460LPH fuel pump EBC Flex sensor Haltech Platinum pro plug in ECUPrepped by Hadie from Elite Motorsport
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Yes can be done. Dyno footage of ATR45SAT Powered R33 GTST, making a super responsive 339rwkws @ 22psi on pump 98 fuel. Video footages from Vic-drift last week at Calder park. Car is an R33 GTST powered by one of our high flowed R33 Turbochargers, making 330rwkws on E85 fuel.
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Single turbo upgrade - sizing options for a mild 2.6
hypergear replied to shodan's topic in Engines & Forced Induction
Responsive 400awkws single for an stock unmodified Rb26 engine. After doing trail and errors I think many aspects of the Rb26 is over rated. As a turbo mob, I have unlimited turbocharger resources in modding my own GTR, Goal was responsive 400awkws E85 fuel, single externally gated on an unopened, unmodified factory engine, that means, no cams gears, no cams, no bigger bottom ends, purely stock standard. After trailing various housings plus mixed and matching wheels. My final result on a unopened S3 R33 GTR was 411awkws on E85 fuel, It made 200awkws and 20psi by 4000RPM. Power band was streetable and close to factory twin's response. Turbo was built with normal inconel turbine, cast comp wheel, ceramic ball bearing, nothing fancy. Light blue ATR45SAT BB vs Red stock Rb26 twins: -
GT30 turbine wheel in .82 rear is a good combination for a Rb25det NEO, it performs well both internally or externally gated. I would keep that housing. Getting better response you can down size the comp wheel to 76mm or one of our SS2 Billet 74mm wheels with a none surge slot comp housing plus a 4 inches metal intake pipe. That would be quite responsive to drive and capable of reaching around 300rwkws.