I just had a low compression b16 motor built with 9:1 pistons,rods etc and supertech valvetrain with GSR cams the car made 220 hp on 8.7lbs of boost revving to 8k with a base tune did'nt do many pulls..

On my stock b16 motor,b16 cams etc with the same 8.7lbs of boost it made 262hp at 8200..

I knew i would lose some hp going low compression but i was hoping with the .5mm oversized valves and valvejob plus the GSR cams i'd get close to the same 262hp that the stock motor made but i guess that was wishful thinking..

Now i'm hoping for 300hp on 15lbs after installing the 3 bar..I was told my 60 trim is'nt even in its effcieny till i get close to 15lbs..

I was actually told to run 17-18lbs but i'm scaried of cracking a sleeve..

 

was it the same turbo? and what did u change besides the pistons, valves and rods?

 

Check your tune, 9:1 will take quite a bit more timing than your 10.2:1 motor. You're looking at maybe a 10 HP loss from compression after you adjust the timing, but you should be easily making more power with the GSR cams even with lower compression.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted92 &raquo;</TD></TR><TR><TD CLASS="quote">Check your tune, 9:1 will take quite a bit more timing than your 10.2:1 motor. You're looking at maybe a 10 HP loss from compression after you adjust the timing, but you should be easily making more power with the GSR cams even with lower compression.</TD></TR></TABLE>

 

^

 

Yeah everything is the same the only difference is a different block with weisco pistons,eagle rods,arp big rod bolts,bearings etc. The head got a 5 angle valvejob all supertech valvetrain..

I was told the GSR cams love more boost and when i turn up the boost next saturday is when they'll shine..

I really just got a quick tune to put some miles on the motor nothing drastic...

I plan to run atleast 1 bar 14.5psi but my builder wants me to run 16-17lbs i'm just scaried of cracking my sleeve..

i'm looking for 300hp to the wheels and a low 12sec car..

 

your not going to crack a sleeve if you have a good tunner. You can run 20+psi on stock sleeves with pistons and rods..... but if you trust your tunner than you will be fine with pushing 16-20 psi

your motor could probably make around 400whp with a good tunner

 

dude like the dude above me, your set up for at least 400 .. I got a ls/vtec with pretty much the same build but aebs headstuds (big deal) and im shootin for 400whp