vtak?

 

dude i dont know where you crunched your numbers at but, p30 pistons will not put you at 12:1 + compression with gsr stroke and head etc... anyway, ppl are forgetting to mention the differnece in the heads. a type r head is ported/polished/etc from the factory and is of the same CASTING as the b16, so its got larger combustion chambers. the gsr head will give higher compression than an itr head. thus, if you install jdm itr pistons in your gsr block, youll end up with higher than jdm itr compression bc the head has smaller combustion chambers, while the block remains geometrically identical. pct pistons will probably put you close to 12:1 compression. check out c-speedracing.com for a compression ratio calc. your ideal compression for the street is probably not much higher than 11.5:1. any more than that, and you have to detune to run on pump gas depending on how large your cams are and how much compression they can bleed off. in any event, on a street tune you wont make any more power running over 12:1 compression than you would running low 11:1 compression range. you can tune the lower amount of compression more aggressively and make the same power.

bcIII is a mean cam designed for road course use. broad useable power its its goal, hence your vtec crossover is not very noticeable bc the primaries are similar to the secondary lobes (much like an h22). thus, you get more area under the curve and a slight upgrade over itr cams. skunk2 stage 2 cams are a great street cam, but it sacrifices some midrange to the itr bc of its larger profile. the beauty of itr cams is their broad area of power. they may not make the same peak numbers, but they will make more power at a lower rpm before the s2stg2 cams pass them up. just my thoughts.

and by the way, its hard to believe that an lsv with 12.5:1 compression on p30 pistons and ctr cams made 214 at the wheels. its hard enough to get a 2l setup to make 200 n/a hp on ctr cams with that compression, let alone 14 more whp.

 

^an ITR head has a cleanup polish just inside the runners. The combustion chamber is EXACTLY the same as a b16 head. I wasn't running p30 pistons and the b16 head didn't have stock runners or combustion chambers. I admit, my quick guesstimate was a bit high for the b16 pistons. Although, 12:1+ is just a .030" mill on the head away. .030" bumps the comp approx 1 full point. Many people on here can vouch for my old LSV. It was one of the fastest DA's in the area at the time. Also, with a proper header, 200whp on ctr cams is not a feat.

 

200 whp on ctr cams can be done, but not very easily witha 1.8l motor. was your setup bored to 84mm perhaps? yes b16 and itr heads are from the same casting so they have similar combustion chambers, but thats it. its got a mild port job and a better angled valve job like you said, and better cams, valve train, valves, and lma's. the GSR head has smaller combustion chambers. thus, about .3 or so extra compression (i forget exactly how much.)