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Old 10-20-2004, 08:54 PM   #1
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Default Resources for FI of an engine originally designed for NA?

I am in an IC engines class here at WVU, and we were given a design project. I am looking for books that would pertain to the proper preparation for aftermarket turbocharging of an engine. For my design project, I want to design a system for turbocharging my ej25. (lower the compression, cams, timing, etc.) The design is going to mainly be what I can do internally to the engine to make it more ready for turbocharging. I've already ordered an older issue of grassroots motorsports that covers about every aspect of the stock ej25 with info on dimensions, etc., and am going to use that as a starting point for the base information.

So, what is some good reference material that will outline the problems that will be faced by adding a turbocharger to an engine that was originially designed naturally aspirated? Is there a turbocharging bible out there? Unfortunately, information on the forum doesn't work out really well as "official" reference material.

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Old 10-20-2004, 08:59 PM   #2
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- Forced Induction, Performance Tuning by A. Graham Bell
- Maximum Boost: Designing, Testing, and Installing Turbocharger Systems by Corky Bell

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Old 10-20-2004, 10:25 PM   #3
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Just quote me! i'm pretty cool!
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Old 10-21-2004, 05:49 PM   #4
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Originally Posted by Wedge
- Maximum Boost: Designing, Testing, and Installing Turbocharger Systems by Corky Bell

I just bought this book on Tuesday. I highly recommend it.
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Old 10-21-2004, 06:33 PM   #5

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Maximum boost will help quite a bit. I think I might have the old issues of Sport Compact Car where project 2.5RS was first turbo'd and tuned... but that really depends on how much you feel you can trust shiv as a factual informative source.
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Old 10-22-2004, 02:47 PM   #6
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98 2.5RS
tuning student...

Impreza GC8 force fed

you want info on turbocharging your gc8 huh? well, this site is probably the best resorce you will find. RS25 also has some good impreza only info.

Your idea for forced induction is good. But the foundation for your project is not exactly a good one. Even if you replace your stock rods with beefier ones, and swap your pistons out for some with lower CR you are looking for trouble.Take a look at the deck of your ej25. The entire circumference of the cylinder walls is OPEN. At first you will find that you can run as much boost as your rods can handle. BUT over time your nice round cylinder walls will become nice OVALS. The ej25 just can't hang.

Since you're in a tech program you might have a decent machine shop. If you are able to fabricate sleeves or close in the deck than you will be in luck. But If I where you I would just go out any buy myself an ej22t. I just got mine in the mail...that thing is friggin BULLETPROOF! you could even get the new STI block. These are both afordable ways of running over 350WHP in your car.
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Old 11-05-2004, 01:14 PM   #7
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I'm not actually turbocharging my RS. I'm just doing a hypothetical design project. Hopefully I'll get enough information to determine where the problems will be.

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