alright im getting a gsr in a couple of days and have quite a bit of money saved up. its a 00 gsr with 64k miles totally stock. im planning on aem cai, apexi gt spec or apexi dunk exhaust, aem fuel rail, act 4 or 6 puck disc with act prolite flywheel.

my question is, im really wanting to build the head on it because im not going to be daily driving it. im wanting to put some crower 404's in it. i know that i would have to upgrade the retainers, valves, and valve springs and also raise the compression. How would the ITR pistons work with the 404's? would that make enough compression or if u guys know some better pistons to put in it please lemme know.

also how much power could i expect to get with the usual bolt ons then putting in the 404's? thanks guys

 

well first off.. the GSR pistons are 10.0:1 compression... i believe the ITRs are either 10.5:1 or 11.0:1.. that should be fine, you can also raise your compression by shaving the head a tad, your local machine shop can do that, along with a port and polish if you want a good amount of horses. But be absolutely SURE its not going to be a daily driver.. the port and polish is gonna decrease gas milage, raising the compression is gonna need some high octane fuel and the clutch, flywheel, and cams are going to decrease drivability. Try to get a 3angle valve job and try to clean the head up as much as possible.
With all that and a maybe a new IM like skunk2, thats pretty much running nice all motor setup.. i know the cams themselves will give you about 15 horses.. everything else included will give you well over 200 i garuentee you

Have fun

 

10:1 c/r already requires premium, so go fo the 10.6:1 USDM pistons. better than shaving the head; it won't decrease your piston-to-valve clearance, since you're going to already be decreasing that with cams. and BTW, big cams and compression will make a very enjoyable enjoyable engine, just don't have too much fun. i get a whopping 12mpg when i'm out having fun, and that's just a cammed LS motor, no head work. also, look into skunk2 intake manifold or a knock-off like blox.

 

i mean this gsr is going to see quite a bit of street driving but not every day. probably an average of 20 miles each time it goes out. im wondering about the 404's because i want something a little more agressive than the 304's. but say that something happend to my wrx and i had to street the gsr for a while, what could i expect? like gas mileage, what about just the pure engine reliablilty?

 

no reliability changes. as for me, my engine is LS w/ BIG cams, so it's kind of like having VTEC on all the time. i still get 28-30mpg w/ a bit of spirited driving and redlining at least a few times in every drive. don't worry about it.

 

That's just fine for daily driving.

 

I didnt think they made 404's for vtec motors?
http://www.crower.com/cat/impo...shtml

 

wow, i bet somebody feels crunchy now. i thought there were lots of crower profiles for B-VTECs, but i guess not.

 

so 404's chipped p28 itr pistons vavle train upgrade and p&p will still be good for some streeting? just not a whole hella lot?

what about the jdm itr pistons? arent they 11:1 comp.? if not then how would 11:1's work in with this set up?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 99LStegra &raquo;</TD></TR><TR><TD CLASS="quote">so 404's chipped p28 itr pistons vavle train upgrade and p&p will still be good for some streeting? just not a whole hella lot?

what about the jdm itr pistons? arent they 11:1 comp.? if not then how would 11:1's work in with this set up?</TD></TR></TABLE>

Yah.. the only reason you want higher compression is because it'll make ur engine run smoother.. thoes cams will do the opposite.. higher compression is just kinda balancing it out.. i've seen guys go like.. 13.0:1 even 14.0:1 just the cams and pistons shouldn't mess up your gas milage too bad... if at all.. the port and polish will. If you were going to have a bad-*** street/strip/sunday car.. i'd say go for the port and polish.. and port your IM.. stuff like that - gets more air and fuel into your engine just screws up your gas milage

 

any special tricks or anything else that i would have to do while getting hte pistons? like rods or anything? if so what kind would u recommend?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 99LStegra &raquo;</TD></TR><TR><TD CLASS="quote">any special tricks or anything else that i would have to do while getting hte pistons? like rods or anything? if so what kind would u recommend?</TD></TR></TABLE>

Well... to tell you the truth if you have the time, and money.. just drop the whole b18 out, and rebuild the whole thing. Strip it down to the block, take it to a local machine shop, have them clean it up for you. You could also get some work done to the head and many other things i can't think of right now. By doing all that it'll help it out bigtime - so your not running brand new parts with worn parts. there are so many things you can do to the head, but rebuilding it with all new parts will definetly help out.

also if your REALLY into building a powerful N/A b18 - bore it out .10 or .20 over and thow on some over sized pistons along with all the other things you've mentioned and you'd have a mean gsr

On another note, thats a lot of work and theres tons of things you can screw up if they aren't done professionally.

To answer your question.. yes you can get rods, i highly recommend it.. there are also things like the crank you could replace. Do tons of research, theres things like stroker kits that will incrase your displacement and give you better low-mid power... theres endless possibilities and thats y i like N/A better than a turbo (turbos are more computer than mechanical work)

 

i eman i don't want to totally rebuild the whole thing, i want soemthing thats gonig to be street reliable when i have to street it and put a couple of miles on it each time it ake it out. but im wanting something that is going to be one mean track *****

 

I know what you mean.. pistons, rods, cams, headwork.. it would be a mean track *****.. but i doubt it would be able to touch your WRX if you put the same amount of money into it.. but check out Crower, read about their cams and what they recommend you do to get full potential, then research pistons and rods.. should be a fun project - Good Luck