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Old 09-21-2001, 08:53 PM   #1
fourbanger
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Default how much boost can i run on my EJ22T

i have a 914 porshe with a subaru EJ22t engine how much boost can the stock turbo run before it goes out of its eficiency range? Im runing the stock injectors with an sds programable managment system and a bosch 300hp fuel pump.
first i wanna see how much power i can get from the stock engine and familiarize myself with the tuning before i do a build up with bigger turbo,injectors,custom exhaust man.ect. ect...i also posted some q's about swaping ej25 heads on to my engine yesterday but for some reason my thread was closed? this is the most informative source for subies ive ever seen.

happy new member -see ya
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Old 09-21-2001, 09:46 PM   #2
Jonathan
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Most of us Legacy 'wussies' havent experimented a whole lot with turbo kits. We seem to manage fine with our ej25's. Bill Harvey on the other hand has gone to great lengths to build up his RS with a specially ordered ej22t closed deck mill, running a JC Sports Turbo kit (one of very few kits out there).

I would ask him.
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Old 09-21-2001, 09:54 PM   #3
fourbanger
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johnathan,
its not a turbo kit.its a stock 94 legacy wagon 2.2l turbo engine with an ihi rhb52.it boosts 8psi.
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Old 09-22-2001, 03:25 AM   #4
DLC
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I've run mine up at around 13.5 on a spike, but 11-13 is what i normally have my AVC-R set to.

The turbo is smallish, so i'm sure 13 is at the far end of it's range.

The engine, on the other hand, can take ~300hp in stride if given enough fuel, enough air and enough of a watchful eye on the ignition. Some guys have tweaked over 500 from this block, but that obviously takes a bit more work.

The heads swap over, just do a search in the Aftermarket Turbo Forum. They closed the thread because it's been gone over so much.

Oh, and i've never gone over %75 duty, even at 13PSI. The injectors are ~380cc/min, decent sized for the turbo, but a larger pump and FPR can make them work a bit better.
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Old 09-23-2001, 05:43 AM   #5
fourbanger
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dlc,
are those boost figures with an intercooler?
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Old 09-23-2001, 05:56 AM   #6
fourbanger
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dlc,
i forgot, you said the injectors will work better with a fpr.does that mean that the 380cc stock injectors can be run at higher pressures without risk of injector failure?
i thought of this but was afraid they would fail at higher than 38psi.what do you think would be the higher pressure they would tolerate?

thanks for all the info,most appreciated



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Old 09-23-2001, 04:14 PM   #7
DLC
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No intercooler.

It's been my observation that adding fuel pressure seems to keep injectors working slightly better at higher pressures and the engine from detonating and running lean. Granted, everything should be as well monitored as possible with an EGT gauge, but i'd say they can probably take another %10-15 safely.

My first recommendation would be to send them in to RC Engineering for a thorough cleaning and blueprinting to make sure they're up to stock levels and are functioning properly, something that i still haven't got around to.
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Old 09-23-2001, 04:20 PM   #8
fourbanger
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sounds good.im planing on installing a water to air intercooler.
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