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Hi.

I have a Civic Si K20 2003 which I plan to get a basic turbo kit this year. I would like to approximately how much whp and/or boost i can safely get out of the K20 without changing anything that would not be bolt on?

I am adding a ACT clutch (HDG6) and ACT flywheel Prolite Series, and am also in the process of replacing the 3rd & 4th gear synchros. I will also be adding a cat back exhaust, and would like to add a high flow fuel pump, fuel rail, and injectors.

As far as how much whp would like to get out of the car? Well i would to like get 250whp to 300whp.

 
Rep Power: 285

A cat back exhaust will be insufficient for a turbo'd car, you need header to tip.

250hp could be achieved with a turbo set-up and hondata, but you would be pushing the limits of how hard you can push your motor without building it. If you want a reliable 250-300hp I would suggest you look into a k20a2 head swap and a minor engine buld.

 
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Thank you.

 
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Your welcome.

 
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Or you could swap in a K24 and boost it.More power and torque.Running that VTEC-killer setup

 
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So how must psi or hp could i run the stock K20 in my Civic Si to, without having to swap engines or changes pistons rods, cams, valves, (internals) etc? Could comfortably run 6-8 psi and still maintain general reliability? Would I really have to do anything to the injectors and/or fuel system?

Honestly the car as is is very quick considering how light it is. If i can break 220 whp on regular gas i think i would be a very happy man.

 
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6-8psi would be relatively safe and I think pushing 200-220hp would be possible without building the internals of the engine. To get to that point you will need hondata and a good dyno tune, upgrading the fuel system is a must as well.

Even a conservative turbo set-up is an expensive endeavor if you want to do it properly and not eventually destroy your engine.

 
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Any idea which kit you're looking to get?

 
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Not sure what kit I'm going to be purchasing. Any recomedations? There are several on eBay which seem to be a lot less expensive than others that I have found online.

 
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The ones on ebay are cheap for a reason, they're complete junk and will like destroy your motor never mind giving you anywhere near the power gains you want.

Bottom line, if you don't have $3k to spend don't try and go turbo.

 
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Trust me,you don't want to get an eBay turbo.Those things are crap and we kill your engine.The kits that won't kill your engine will run you at least $3000.Greddy and HKS are both good turbo brands.They're the more expensive brands,but reliable.

 
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Honestly if 220 to the wheels is your goal you can make that na no problem. just build the motor and dont worry about a turbo kit if thats your goal. and a turbo kit would push you over 220whp easily with a good tune. just go na thats what i would do if just wanted to make 220whp.

EDIT: just read that you got a k20a3, disregard what i said and go with a turbo or get a different motor for the same price, na with that motor wouldnt be that great unless you get a k20a2 head so youll have real i-vtec.

 
Rep Power: 285

NA is possible, but it's no less expensive than going turbo and pretty intense.

Pistons; Rods; K20a2 head; stage 2 cams; aftermarket springs, valves and retainers; intake; exhaust; hondata. Thats easily 5k worth of parts to hit 250hp with a very aggressive tune..