Hi, i'm a new member, but i've been lurking around here for quite some time -this forum rocks. Anyway, i'm putting an ej22t into my 93 impreza L and i have a bunch of questions about upping the boost on one of these engines. First off, how much boost (or air maybe i should say) can the stock fuel system handle and what part of the system is the weakest link? in other words How much hp can the stock fuel pump support? How much hp can the stock injectors support at stock fuel pressure.. MAF sensor? ECU?
Also i was looking at the compressor map in the factory service manual:
and i noticed that the airflow was measured in cubic meters so i don't really know what kind of hp the ej22t will produce per cubic meter of air. but they say as a general rule that 1 lb per minute of air is equal to 10hp. So with the stock turbo at 14.7psi it can flow 7 cubic meter of air at 76% efficiency. 7 cubic meters is 8.554 kiligrams at STP and 8.554 kilograms is 18.82 lbs so that mean i could make 188hp if the engine burns the right amount of fuel right? Has anybody had results like that from turning up the boost?
Oh and with the compressor spinning at 140,000 rpm is a WRX intercooler sufficient to cool the hot air?
Well, if you do a quick search, all the answers are waiting.
But to make it quicker:
#1 Our fuel system is one of the pitfalls of this car. The injectors will not support anything over 13-15psi on this engine ( without going over safe levels) (besides you hit factory fuel cut at 13 psi)
as for the intercooler- people on here tend to go with the saab intercooler or the wrx one. each one has its pros and cons.
Take some time and read up on the individual specific forums on those questions.
The answers are all there if you take a moment and read up.
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thanks. Ok it says 13 psi in a lot of other posts, sorry. but just to be clear, if i want to go above 13psi it needs a FCD, new fuel pump, bigger injectors, some MAF sensor trickery and some form of engine management? That doesn't seem worth it. not to mention a more efficient exhaust , and an intercooler.
but i guess one of my other questions still stands. I want to know how much air the engine uses at 13 psi and how efficiently it uses the air. It seems like you would need to know that in order to use the compressor map.
BTW i have this other question that's been bothering me. Why does this engine have peak torque at like 2800rpm -thats like a diesel. So i'm just wondering if someone has explained that yet. my guess is that cam timing has a lot to do with it. the SOHC designs i think limits the intake valve timing. This i think makes the dynamic compression ratio too low for high rpms performance.
doormat wrote:thanks. Ok it says 13 psi in a lot of other posts, sorry. but just to be clear, if i want to go above 13psi it needs a FCD, new fuel pump, bigger injectors, some MAF sensor trickery and some form of engine management? That doesn't seem worth it. not to mention a more efficient exhaust , and an intercooler.
but i guess one of my other questions still stands. I want to know how much air the engine uses at 13 psi and how efficiently it uses the air. It seems like you would need to know that in order to use the compressor map.
BTW i have this other question that's been bothering me. Why does this engine have peak torque at like 2800rpm -thats like a diesel. So i'm just wondering if someone has explained that yet. my guess is that cam timing has a lot to do with it. the SOHC designs i think limits the intake valve timing. This i think makes the dynamic compression ratio too low for high rpms performance.
There is an SAE Technical Document out on the intarweb that's a good 20+ pages long that details the 2.2NA, 2.2T and 2.0T engines. Dave used to have it linked on his site. I'll see if i can find it for you.
You're lucky i didn't find this thread first, your earlier questions could have been solved by searching, and this thread would have been locked.
thanks for not locking my thread. but you should probably delete it after i'm done asking off the wall questions. if you feel like it. Do you remember the name of the SAE document ? maybe i can buy it from their website.
The EJ22t seems like such an odd and interesting engine. With a forged bottom end and perfect 1.75 rod stroke ratio it seems like it would make a bunch of peak power at high rpm. unless there's someting screwy going on with the cylinder head. The Japanese version had the same block but with a DOHC head right? So is their power curve different at all?
