does anyone know the compression ratios for an ls vtec with a b16a2 head with gsr pistons and with p30 pistons?how much of a difference in power will they make vs each other?SOMEONE HELP!


Modified by the_big_dl86 at 6:18 PM 11/20/2007

 

really if your going to use gsr pistons i would just do a poor mans type r in a gsr block but if you have both block laying around i would take everything out of the LS block and put it in the gsr block stright sleeper just tell everyone its a poor man type r and its a better build for a ls vtec like that because their is no oil line no rep tapping the head i am doing a build with the same set up in a gsr block but with a eagle crank scat rod and je 12.5... till i sace more money to have my b20/vtec resleeved

 

or you could just do what i did and get the black braided stainless line, and black fittings so you cant even see the oil line from head to block, and it takes like 5 minutes to plug the hole in the head.

 

you need to search, your answer to your question is here:
http://www.c-speedracing.com/h...c.php

and for all your other questions https://honda-tech.com/zerosearch

 

the c speed calulator isnt perfectly accurate, but it will give you a good idea.

 

i say go with b16 pistons or ctr if i were you. i went with gsr piston which is around
10.0-10.5 compression ratio on a stock gsr head. and i just made 180hp and 129tq on crome.

my setup

stock gsr head
skunk2 stage 1
m factory cam gears
jvt 4-1 header
catco 2.5 in and out
thermal r & d catback
b18b bottom
ls rod
arp rod bolts and head studs
vtec was set at 5000rpm

well i hope this will help. overall it depend on budget and what you plan to do with it. good luck

 

ctr's are not a good idea in an ls block because you will be looking at well above 12:1, and in my eyes, and asston of research, 12:1 is just about the perfect street comp ratio.

 

ok well i have decided to go with the p30sand stock ls rods with arp rod bolts. o and compression should be 11.7:1

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by killerpenguin21 &raquo;</TD></TR><TR><TD CLASS="quote"> and in my eyes, and asston of research, 12:1 is just about the perfect street comp ratio.</TD></TR></TABLE>

I would argue that roughly 11.5:1 is the best comp ratio for the street unless you're running cams that require more.

 

oh and does anyknow if i can use my ls injectors with the obd2 ecu and stuff since pretty much everything on te car will be obd2

 

your injectors have to match the wire harness, if they do, they'll work.