hypergear

Yes that is on E85. I don't have result of this version on 98 yet. it would be sitting pretty close to 300rwkws on that car.

Rb25det unopened engine HyperGear High flowed R33 Turbocharger ID 1000cc injectors Walbro 525L fuel pump Haltech ECU Greedy Profect B EBC 600x300x100mm Cooler kit 3.5 inches turbo back exhaust 3inches intake pipe with Pod Split fire coil packs Internally gated factory exhaust manifold. Car made 342rwkws @ 20psi, E85 fuel.

Further development in R33 21U high flowed turbochargers. Latest model made 342rwkws fItted to an unopened R33 Rb25det engine as a bolton turbo with FMIC, 3 inches metal intake pipe, 3.5 inches turbo back exhaust, fuel system and programmable ecu.

In simple terms, stock engine and basic supporting mods on pump 98 fuel. -9 can get you around 300awkws responsively, -5 can get you around 360awkws but its abit laggy.

Thats in .82 rear housing. Power curve is in response to boost curve, unfortunately I don't have a boost reading. I've dynoed way more powerful cars on that particular dyno there's not issues with it. The only time I had similar power outline was a boost spike. Might be a delay in ext gate response, boost spiked around 4000RPM, then dropped back to norm. Could be waste gate springs are too hard, gate is jammed, hoses connecting to the external gate is too long or parameters in the EBC not 100%.

Just a quick note, the ATR45SAT you had was a 5 years old unit, current model is different, result has been updated to dyno section. More developments are underway. And result to share: GTX3076R Gen 2 maxed on a built Rb25det Neo on 26psi of boost, externally gated on E85 fuel.

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.

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.

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.

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.

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.

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.

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.

Yes alot.