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EJ20G closed deck, torque/boost/power limits by component?


BLSTIC

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I've got a closed deck in my gen1 legacy, and I'm thinking of building it to be a torque monster to develop power rather than rev much higher than stock (it's an auto street car that I don't much care to have big cams and a high stall in),  if I do anything in that regards it will just be stock v3/4 sti heads and cams. Just assume I'm running E85 and have a compound turbo setup for it, so actually making the boost and detonation don't really come into it.

 

But at some point I'm going to run out of strength in my conrods, head bolts, case bolts, and bore, probably in that order.

 

What are the generally accepted torque/boost limits of each component? Eg I'm aware that somewhere between 35 and 40psi the bore itself can split, so I should stay away from 35psi. How much abuse can the case and head bolts take? What about stock sized replacements? The stock rods, how strong are they?

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I'm not really sure of what you're asking here?

 

If you want big boost and big torque, you are going to need better heads and cams. Ironically I've got a set for sale which have been worked heavily ;) 

 

going to a 92.5mm piston, you'll likely want i beam rods for that sort of boost. you'd have no choice but to build your auto or go manual as you'll just push straight through your converter and likely cook the box. 

 

Pinning/dowling the mains and line honing would be a must. 

 

but I'm going to reiterate on the head side of things even if you don't buy mine, you will need head work done and will never achieve what you want on stock heads.

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No not really e85. Port water/meth injection. More or less as effective if all goes to plan.

 

And yes, compound turbo. I want as much torque and throttle response as I can get, along with around 400whp. I don't think there's any one turbo that can do that and provide a low-mid range that isn't worse than stock. If I was "only" after 300whp I could do it with a single though.

 

I'll still be doing the little things like choosing the best heads and manifolds, optimising cam timing, doing a minor porting job, etc, so it will breath slightly better than stock. Might even go for avcs if the megasquirt can support it. I just don't want to go wilder than factory STI cams as that will lose me too much low end.

 

But I digress. Dairusire, I want to know how much torque I can get from one of these blocks before it just can't hold together any more, what the weaknesses are, and if they are easily fixed with off-the-shelf parts like stronger bolts and studs. Pinning the main bearings isn't something I would have thought of in relation to an EJ. Seams feasible though, and not horribly expensive. What about the case and head bolts? When do they become a problem?

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