Big Turbos - Subaru WRX Forum
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post #1 of 23 Old 06-28-2008, 09:33 PM Thread Starter
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Big Turbos

Hey guys and girls I have not been on for a long time due to the training of my new job that I am about to start. I am about to have a job making $27 /hr and I still got the wrx and I am going to have alot of money to start going big with the car. The only thing that I have noticed is that in all of the mags that I see a wrx in they all have swapped the ej 20 out and put in the ej 25. What I want to do is keep the engine that i have right now the ej 20 and just throw a big turbo on it. I don't really care about the turbo lag I just want to see what the ej 20 can handle. I was thinking about a gt 30 r but I am really not sure what the most bad @$$ turbo would be for the 2.0l. Thanks to everyone that reads this and posts in advance.
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post #2 of 23 Old 06-28-2008, 11:20 PM
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I would work on the tranny first and give yourself the peace of mind that your drive train is going to be able to handle whatever you throw at it. I would build a bulletproof bottom end next before slapping a BT on there. Assure yourself you aren't going to have a broke down ride because you just went ahead and through a bunch of boost at your car without supporting it. Definitely am looking forward to seeing the build though! Cheers!

Edit: I have read about stock bottom ends supporting 400hp+ at the crank, but for how long? Who knows.

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post #3 of 23 Old 06-29-2008, 01:21 AM
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I agree with stagger on this. If you have the money you say you are going to have, build it right the first time. Look up Lil Shoaf (Ken) as he has built a rather formidable car. But he had his bumps in the road with it.

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post #4 of 23 Old 06-29-2008, 06:47 AM
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What modifications do you already have done?
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post #5 of 23 Old 06-29-2008, 10:44 AM Thread Starter
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rght now all i have is a CAI, TBE catless, and uppipe. The TBE and the uppipe I am going to take off when I get this job because it was a cheap one and I have had issues with exhaust leaks. I knew that I was going to have to built up the tranny and like you guys said it is going to be better if I do it right the first time with the bottom end as well it is going to save me money in the long run and alot of head aches. If I build this up the right way do you think the 30r will be a good turbo to run?
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post #6 of 23 Old 06-29-2008, 08:10 PM
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With supporting mods the 30R will be laggy but do-able with the EJ20...you will want build up your bottom end..maybe even stroke it out to a 2.3L

What type of racing do you plan on doing?



Quote:
Originally Posted by 02subiecolin View Post
rght now all i have is a CAI, TBE catless, and uppipe. The TBE and the uppipe I am going to take off when I get this job because it was a cheap one and I have had issues with exhaust leaks. I knew that I was going to have to built up the tranny and like you guys said it is going to be better if I do it right the first time with the bottom end as well it is going to save me money in the long run and alot of head aches. If I build this up the right way do you think the 30r will be a good turbo to run?
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post #7 of 23 Old 06-29-2008, 08:43 PM Thread Starter
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I would like to do drag racing the only thing that I was trying to do is try and squeeze out as much power that I can out of the 2.0l everyone has been telling me that I should stroke it but If I am going to stroke it wouldn't it make more sense to buy the 2.5l motor
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post #8 of 23 Old 06-29-2008, 11:30 PM
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Quote:
Originally Posted by 02subiecolin View Post
I would like to do drag racing the only thing that I was trying to do is try and squeeze out as much power that I can out of the 2.0l everyone has been telling me that I should stroke it but If I am going to stroke it wouldn't it make more sense to buy the 2.5l motor
If you were going to do more than drag race (Rally/AutoX) a 2.3l would be great..those are TQ monsters.

To get the most out of your EJ20 you will need to build the heads as well as the block to safely support a 30r turbo. If lag isn't a big deal go ahead and get a 35r sized turbo if you are going to build the rest of the motor

If I was to build an EJ20 Mod List (budget not in mind):

Standalone ECU
P&P Heads - with Valve upgrade, Springs, and retainers (stronger head studs)
Billet Crank with stronger bearings, rods, and pistons
Higher Flow Intake Manifold
a True 3" or 3.5" exhaust
Equal Length Headers
Wide Band O2
Solid Motor/Tranny Mounts
12mm oil pump
STI Oil Pan
Bigger front brake calibers at least
at least 850cc injectors/255lph pump to tune with E85

This is just for the motor - If you are going to drag race with a lot of power you will need to consider spending at least 5k on your tranny.
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post #9 of 23 Old 06-30-2008, 01:44 AM
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If you plan on alot of drag racing, you will also need to mind your axles as well, just something else to think about.

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post #10 of 23 Old 06-30-2008, 10:29 AM
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Spend your money on brakes,wheels/tires and suspension first.I garentee you will get tired of that GT30r.It's just not going to be fun driving around town.Smaller turboed cars are way more fun to drive on the street and for spirited driving as the boost threshold is so much lower.Get a Evo III 16G or a 7cm TDO5H-18G an you will be more than happy.

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post #11 of 23 Old 06-30-2008, 11:13 AM
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Quote:
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Spend your money on brakes,wheels/tires and suspension first.I garentee you will get tired of that GT30r.It's just not going to be fun driving around town.Smaller turboed cars are way more fun to drive on the street and for spirited driving as the boost threshold is so much lower.Get a Evo III 16G or a 7cm TDO5H-18G an you will be more than happy.
I completely agree with that!

Or you could do a medium sized twin scroll turbo and have the higher HP with quicker spool.
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post #12 of 23 Old 06-30-2008, 11:39 AM
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one of my buddys has an fp green on his 2.0......i would say its not to bad on lag..i think full boost at around 4200 give or take...at 21 pounds on stock block...with the 6speed.....i wana get a green in the future on my 2.0........
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post #13 of 23 Old 06-30-2008, 05:52 PM Thread Starter
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What would be a medium twin scroll set up I really didn't think that the 35r would be that laggy my friend has it on his talon and with a good tune it spools at 4100ish.
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post #14 of 23 Old 06-30-2008, 07:40 PM
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Quote:
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What would be a medium twin scroll set up I really didn't think that the 35r would be that laggy my friend has it on his talon and with a good tune it spools at 4100ish.
A 35r is laggy even on a 2.5L.I thought you wanted a 30r?If your saying "it spools" at 4100 that is pretty bad.Your basiclly saying the boost threshold is 4100rpm.Stock turbo spools around 2000rpm-2200rpm and can have 20psi by 3000rpm in 3rd gear.You can't compare two different engines and think the turbo is going to act the same on both.I-4 engines have the turbo about 12 inches away from the exhaust ports.Very little exhaust energy is lost.

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post #15 of 23 Old 06-30-2008, 08:39 PM Thread Starter
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I did want to do the 30r kit but boost buddy made it sound like if I built up my motor that I could run the 35r the reason I want to do this build is I want to make the most power that I can using the 2.0l like I said before most people just go and swap the 2.0 for the 2.5 you rarely see a good 2.0l build come to think of it I have never seen a high horsepower 2.0
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