well..if i do get a swap into an ej25, and want to turbocharge it...what is the highest psi can you boost? and to who has done this before? give me all the info i need..let me know...thanks wagonL
What kind of engine are you dropping into what kind of car? I'm confused. There is no magical "highest psi" under which a certain engine (I'm not clear on which engine you are talking about) will run and above which it'll blow up. Pressure (psi) is not the key, volumes or masses of air are, coupled with the compression ratio of your motor. It doesn't help to think in terms of psi, because 10 lbs of boost on one turbo might give you a nice kick in the pants, whereas 10 lbs of boost on a larger turbo might be so much air that it blows your motor. Or think of it this way, if for some insane reason you put the WRX's TD04 on an EJ257 you might never make more than 15 lbs of boost because the motor just moves so much air that it literally sucks that turbo dry...it'd fall on its face after 4000 RPM (total guess) and stop making power. Put a properly sized turbo on the same motor and you can run 25 lbs of boost and keep making power to redline. For a given motor of a given compression ratio, there is only so much air you are going to be able to cram in there while avoiding detonation. You'd want to pick a turbo that can efficiently move the amount of air your engine/heads are capable of flowing. Then if this is a turbo going on a normally NA motor you'll need custom fabbed exhaust bits in all likelihood, piping, injectors, oil line, standalone engine management, tuning, the whole 9 yards. I would suggest doing a LOT of reading in the NASIOC Aftermarket Forced Induction forum. I'm assuming money is no object for you because it is by no means cheap to do something like this the right way. And that's how you'd want to do it, if you're going to spend the time and money...it just makes sense to do it right from the start. PHATsuby would have some good input on this as well.
Joel pretty much hit everything. LOTS of research is key, all this info has been covered on NASIOC in the AFI forum. i recommend purchasing corky bell's book on turbocharging also. I can answer questions but do research before hand. Ben
Joel really covered it. I would ask why? If you are going to do a swap why do a N/A EJ25 that was never ment to be forced inducted? Why not do an EJ20T, EJ207, EJ257 which are all built for forced induction.
I agree with bikerboy. I have a turbo ej251 and it's fast but it took a lot of money and it's still not as stable as a swap that would have cost less. Check out i-speed, garage tuning, or aerosim research to look at the possibilities of swaps. You could also do what fuji is planning and build up and ej22t and run butt loads of boost safely. It's all up to you
Come on, all you need is a WRX swap and that's it. No nothing else. Do all the wiring and etc, then you'll be all set. Relieble, strong, and NEW! You want to do it RIGHT the first time, so don't mess with motors that weren't turboed from stock. It'll just give you headaches on the long run. I have EJ22T, and that is a potent block. Just rebuild the internals and you'll all set for boost and power. It takes a little saving, but saving for it is WELL WORTH IT in the end. Don't go with NA EJ25 and turbo it.
WRX swap? Meh, it's so much more unique to have an EJ253 that can blow up at any moment with a turbo bolted to it. Besides there is load of torque quick on the stock RS plants, the turbo just helps it along where it normally would taper off. But that's if you're going with the high CR RS plants, or you could be talking about an EJ257 which can certainly handle the extra air. If you're looking for an engine I was surprised at how affordable the Crawford engines are for starters, though Matt pointed out that a basic EJ257 shortblock can be had for less than $2k with the Crawford pistons in it for whatever CR you're looking for. Wasn't the EJ251 the old DOHC plant? I'm almost certain I've got an EJ253, the Phase 2 SOHC block, they didn't change the plans other than the CR the next years. I'm confused a little. Oh but it's all about the engine management. Do not scrimp when it comes to proper engine management. Did I mention engine management? Apparently it doesn't even need to be properly tuned in order to last a while )
I got this from nasioc, everyone seemed to agree with it, so we are kind of both right 98 rs had the ej25d 99 had the ej253 00-01 had the 251 regarding the psi you can run, it is all up to management. I just recently turned my boost up to 6.6psi and tuned accordingly for it and I smoked a modded Z28SS last night
