high compression turbo build

[neostraight6]

I have a rb25det neo that span a connecting rod bearing. I have a replacement rod and crankshaft to rebuild it. I also have a rb25de neo non turbo engine I was thinking of using as a test bed. The idea is to use the non turbo head+block, install the cams, oil cooler from the neo turbo with a after market turbo elbow (to reduce backpressure) then install manifolds stock turbo and ecu from the neo turbo to see what power I end up with at 5psi and an apexi neo piggy back

[frapjap]

Welcome to NICO!

I have no idea what any of those things are since I'm no RB guy, but it does sound interesting. If you do end up building it, post up a thread! We love the unique stuff here!

[neostraight6]

I curious to see how this setup would preform compared to original rb25detneo, since it would have the turbo cams installed. I have all the parts to rebuild the original neo turbo also, but I have a non turbo neo long block and the time I attempting this build

[Sniper1st]

You should get better torque and response. Thats only if u didn't exceed the limit of your fuel.

[neostraight6]

Just looking for a comparison in terms of power and 1/4 mile time at 7psi with this setup and the original turbo setup. .

[neostraight6]

Also I am using the ecu, injectors and manifolds from the rb25det neo so fuel should not be a problem. The car has a walbro internal pump and a fuel pressure regulator.

[Sniper1st]

I'm refering to fuel type. race fuel, E85, 97 RON, 91, with or without methanol injection?? All this will determine your fuel limitation on this compression ratio which will be 10:1, correct me if I'm wrong

[neostraight6]

97RON without methanol. I friend of mine had a series 2 non turbo with a bolt on turbo and the turbo ecu, injectors and airflow with a t3/t4 turbo on 97RON with no problems. The neo non turbo cams (exhaust) are different from the neo turbo cams.Also the turbo elbow I am going to use separates the waste gate from the turbine to reduce backpressure.

[neostraight6]

High backpressure creates an environment that encourages detonation, so keeping it to a minimum reduces the chances of it occurring in the high compression turbo setup.