Thread: 4G63 vs EJ25
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Old 07-06-2010, 12:15 AM   #92
juanmedina
Scooby Guru
 
Member#: 133146
Join Date: Nov 2006
Location: SC
Vehicle:
07 FPgreen 7.37@95
WRX VF39+E85 12.0, 121mph

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Quote:
Originally Posted by cucamelsmd15 View Post


Now youre dyno racing?

Face it, the EJ25x is no match for the 4G63, regardless of how you slice it. Its more responsive to more boost, more timing and less fuel than the EJ series can ever be.

You can say whatever you want about your EJ25x, but my DSM, with the small 16g and a good tune was somewhere in the 350wtq/370whp range. Good luck finding that on a Subaru motor.

Edit: While I cant remember the specifics of that tune, I do remember that I had about half the timing I used in the WRX to make any sort of power. That speaks volumes.


How else I am suppose to compare them?

Yes dyno numbers with trap numbers, I am talking about completely max out setups. I can fill this thread with tons of data, logs, dyno sheets, slips from EVOs and WRX/STis. To 500whp IMO they are really close, keep in mind on E85 from setups that I have seen; and even my own car.

My car makes 340whp with a VF39, with a small 16g I have no doubt it will make 350whp.

EVOs with stock turbo 8 or 9 are maxing out at 450whp dynojet trapping about 125-128mph with some weight reduction, the EVOs turbo is the size of a subaru 20G 44 lb. EJ255/57 make 450whp dynojet max out with a 20G, with that turbo on my car it will trap 125-128mph no sweat.

If this makes sense:

EVO with a 20G max out will make the same power that a WRX with a 20G max out. The turbos will become the restriction, not the engine. To 500whp dynojet about 30r size, the EJ255/57 with some forged pistons and a good tune its capable of doing the job. You will have to run more boost and timing but EJ255/57 should last quite a good time. Obviously the iron block and more efficient engine can do it longer but at that power level the suby is a fun car.
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