i got a 94 GSR b18c and i want to put some CTR or ITR pistons in. i wanting to clarify what the compression is. i have heard many stories. what is the c ratio for a stock b18c with ctr or itr pistons, also will i need to get it tuned or anything.eg new injectors? it will be runnin on 96-98 octane all the time?

 

gsr w/ ctr pistons - 12.042422511586594:1
gsr w/ usdm itr pistons - 10.836228641070214:1
gsr w/ jdm itr pistons - 11.362493622638828:1

c-speedracing.com compression calculator

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LSvtec03 &raquo;</TD></TR><TR><TD CLASS="quote">gsr w/ ctr pistons - 12.042422511586594:1
gsr w/ usdm itr pistons - 10.836228641070214:1
gsr w/ jdm itr pistons - 11.362493622638828:1

c-speedracing.com compression calculator </TD></TR></TABLE>

Nice... Figured out my compression (11.75:1)

 

Holy ****, guys, come on. THis is getting a little crazy.

THE CSPEED CALCULATOR IS WRONG.

CTR pistons in a GSR motor, unmilled/undecked and oem 3 layer hg is damn near 13:1.

This has been covered on here about 3 or 4 times in that past 2 weeks alone.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by arw321 &raquo;</TD></TR><TR><TD CLASS="quote">Holy ****, guys, come on. THis is getting a little crazy.

THE CSPEED CALCULATOR IS WRONG.

CTR pistons in a GSR motor, unmilled/undecked and oem 3 layer hg is damn near 13:1.

This has been covered on here about 3 or 4 times in that past 2 weeks alone.
</TD></TR></TABLE>

 

how r u shall that it is 13:1?

 

ive got a gsr block with ctr pistons and ive had my compression figured at 13.1 so ya you might be able to get away with no tuning if you run nothing less than 96 and just watch for detination on your motor DUNDADA

 

i have ctr pistons in my gsr and my car is running great man. i do also have hondata but othere than that ud b ok. go for it man, you'll be satisfied.

 

how can that calculator be acurate when not knowing the deck clearance and if the head has been milled? and also bore and piston size? I wouldn't say that it is completely accurate unless ur using it for just a refernce

 

WHEN U DID YOUR COMPRESSION TEST WHAT SHOWED UP ON THE GAUGE 270,280, U CAN EMAIL ME AT BOUNC00@AOL.COM THANK U

 

Man I have a gsr with ctr pistons running on 91 octane and a spoon reflash, thing still gets about 250miles to a full tank

 

Your motor runs good on 91?

 

i want to know too since im about to purcahse a short block with ctr pistons and i believe an ls cranksahft!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM KING &raquo;</TD></TR><TR><TD CLASS="quote">Man I have a gsr with ctr pistons running on 91 octane and a spoon reflash, thing still gets about 250miles to a full tank </TD></TR></TABLE>

check my sig for my 91 octane GSR motor.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2slowGs-R &raquo;</TD></TR><TR><TD CLASS="quote">i want to know too since im about to purcahse a short block with ctr pistons and i believe an ls cranksahft! </TD></TR></TABLE>

the LS crank puts it over the top on that one, with the 87.2 mm crank its already pushing it....