as topic says, i'm building a 2l gsr, but the thing is, i'm not sure how high of a compression i should run (fairly high because of cams, see below) BUT the max octane i get here in toronto is 94. tell me what you guys think i should do. here's my setup.

GE sleeved b18c1 block
pistons ??
rods ??
gsr head
p&p
jun3 cams
jun retainers
jun springs

again, i was thinking maybe 11.5:1 range, but i'm sure i wouldn't be utilizing the cams enough with that compression ratio. keep in mind this will also be daily driven. let me know what you guys think. thanks

 

bump

 

with 94 octane, you can go 12:1 no problems.

 

12:1 no problem with 94 octane. Just have it tuned.

 

with 94 go atleast 12:1

 

thanks guys

 

y not 13.1?

 

With tuning, People are able to tune out 12.5:1 all the time. I would say at least run that. If you have a lot of trust in your tuner, maybe try 13:1. But, only if your tuner is truly up to job.

 

isn't 12.5 or even 13:1 a bit too high for a daily driven car? at any rate, i'll have to find a tuner (if i can find one), and ask for suggestions. thanks again guys

 

if you're gonna go any higher than 11/1 you really need to make sure you tune itso include that in the cost of pistons

em1b20vtec

 

For a daily drivier, I'd stick around 11.5:1.

 

I've been having the same worries. My block is at RS Machines right now getting sleeved and bored to 84.5mm. They told me Arias has a piston on the shelf that is 11.9:1 for the bore I'm going with but after speaking to a different person there, I decided to go around 11:1. My car will still have A/C, power everything, and see a good amount of miles so I'll spray on it occasionally for that extra bit of power.

 

I am gonna run 13.1. I understand the tuning as i have a place that is real close. I just dont see putting the same amount of money to not be the biggest. I do drive my car every day and i do race my car every chance i get. I am also hoping to autocross some this year as well.