ive heard that once you do the h23 vtec swap you cant go turbo is that true ?

 

from what i remeber the h23 vtec likes boost more then a h22. It has lower compression and can handle more boost then a h22.

 

i wa told that the compression was too high to put boost on it , and if you did boost i had to be low . im trying to get 200-250 hp out of the engine

 

Your best bet is to just boost the 23. If you still want VTec, do the head swap and just get lower compression pistons.

 

an H22 head on a stock H23 block will yield rougly 9.3:1 compression

 

of course it's possibile.

I believe there is a guy on here that's running 10s

in his h23vtec turbo hatch

 

nice, in your guys opinion whats worth it a turbo h23 or do a h23 vtec swap maybe turbo ?

 

you should decide first wether or not you want to go the all-motor

or turbo route. If i was going turbo, i would just build the regular h23

up (forged internals etc.)

 

what if i rebuild the engine stock ,no after market parts would it be able to take 10 lbs of boost ?

 

very unlikely, there are very few that can handle that above 8lbs of boost because of the weak ringlands of the h-series motors. But it can be done, there have been people to run 10+ lbs of boost on stock motors.

 

then what kind of upgrades would i need to run 10 lbs of boost

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BLACK_DEL_SOL &raquo;</TD></TR><TR><TD CLASS="quote">then what kind of upgrades would i need to run 10 lbs of boost</TD></TR></TABLE>

A very good engine management system and a very good tuner.

 

I dont know much about boosting preludes I can however tell you what you might need.
Right, you are going to need some kind of ems, you might want to rebuild your engine " with aftermarket parts like forged rods and pistons" just to be safe, especially if your car is a daily driver and you rag on it alot. Upgrade your fuel rail, injectors, lines and fuel pump, you also might want to get some ajustable cam gears so you can tweek to cam timing to flush air in and out of your engine. A upgraded ignition would help too.Stay away from cast iron turbo manifolds they may crack if they get to hot, get a stainless steel tubular manifold they have equal legth runers for a faster spool. When it comes to the turbo get a set up that allows an external wastgate because internaly gated units can boost creep under high boosting "and things may go boom!" also a 3in.diam. exhaust. For more info check out the turbo section of this forum.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BLACK_DEL_SOL &raquo;</TD></TR><TR><TD CLASS="quote">i wa told that the compression was too high to put boost on it , and if you did boost i had to be low . im trying to get 200-250 hp out of the engine</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by H23 Power &raquo;</TD></TR><TR><TD CLASS="quote">an H22 head on a stock H23 block will yield rougly 9.3:1 compression</TD></TR></TABLE>

If you are planning on boosting the h23 vtec is an awesome motor... Tons of torque AND high end vtec power.... And like H23 Power said, if you just put an h22 head on an h23 block without touching the bottom end, it will give you a great compression ratio for boosting... That is exactly why I built my motor...