phantom grey eg

how much of a hp increase can i expect from JUST <U></U> itr pistons in my gsr block? (trying to decide weather to rebuild it with stock pistons with boost or itr pistons all motor)

msmotorsports

If everything is stock look to only see about 10WHP max. Go turbo if you want to see much more power.

phantom grey eg

well im building the head, but i can still use those same parts on the head if i boost the motor with the stock comp. ratio. so i was trying to figure out the hp increase with the itr pistons to see if i can come close to my h.p goal without boosting the motor.

msmotorsports

Whats your HP goal. Your question is too hard to answer with limited info.

phantom grey eg

i would really like to be around the 250 flywheel mark

BANNED HT-USER

Hey tyler, get the pistons, have matt port and polish the head, and tune. you may want a programable ECU
Glad to see you on h-t!

phantom grey eg

thanks dude, deff gunna have matt port and polish it, and put some cams in it , gotta smoke ur s2000

BANNED HT-USER

yes you do

boosted k20

with a stock motor with only ITR pistons installed, i doubt u will see a 10 WHP gain. thats pretty high dont u think for everything else being stock.

hybrid_vtec

Dont hold me to this, but I have always heard that you can expect an 8-10 whp gain for every 1 full point gain of compression over stock ratio.

Anyone else heard of this?

BANNED HT-USER

I haven't heard an equation like that but it sounds about correct. For all motor setups compression levels that increased will not make you loose hp but cause gains. look at the B16B compaired to the B16a, granted the head cams etc. is different, but the pistons make a difference in a 1.6l.

green_GSR

One point raised in compression nets around 2% power increase (that is, with proper tuning). So going from 10.1:1 to 11.1:1 will give you 2% power increase.

BANNED HT-USER

oh wow that is way less then would I thought.

phantom grey eg

guess that means im gunna rebuild it with stock comp. ratio and throw on a base jrsc, that will put me at my 250 hp mark, sorry bill

BANNED HT-USER

stop it tyler

hybrid_vtec

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by green_GSR &raquo;</TD></TR><TR><TD CLASS="quote">One point raised in compression nets around 2% power increase (that is, with proper tuning). So going from 10.1:1 to 11.1:1 will give you 2% power increase.</TD></TR></TABLE>

Are you sure about that?

Chillinit

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by green_GSR &raquo;</TD></TR><TR><TD CLASS="quote">One point raised in compression nets around 2% power increase (that is, with proper tuning). So going from 10.1:1 to 11.1:1 will give you 2% power increase.</TD></TR></TABLE>

sounds too little....especially if you have some other work done.

hybrid_vtec

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chillinit &raquo;</TD></TR><TR><TD CLASS="quote">

sounds too little....especially if you have some other work done. </TD></TR></TABLE>

This is what I was thinking.

boosted k20

it;s proably more than 2% buti think he was talk n about a stock motor. when i install my 11:1 P30 pistons, i better see at least a 10 whp gain and even more after tuning or else............... lol