what kind of numbers (compression ) should i be looking at with this setup.please help. 2nd. gen b16 head,ss fearra valves .b18a block ,ls crank ,crower rods (for lsvtec set up) je oversized (.5 over....81.5mm) 9 to 1 pistons and cometic headgasket.......... i did a compression test and cam out with 150 psi across. what do you think? numbers seem kinda low.

 

As long as your numbers stay within a 10% variance, you're fine.

 

well i don't know if this is the result of the compression but the car seems as though it is running on 2 cylinders . ran really good for 241 miles .it also has a tough time gong up hills if you have to come to a stop. checked the plugs and they are clean, very clean in fact. this is what happened ,motor was rebuilt ,ran the car for 242 miles .at 243 motor stalled going up a hill after i shifted to nuetral.started her back up ran fine went home parked for ten minutes came out and started her back up again and this is how she's been running. the motor runs really well,no stalling ,no backfire, missing ,smooth idle at 750 rpm .starts up easy just no power.

 

well you have 9:1 pistons on there. how thick is your cometic headgasket?? if its thicker than stock then you are running even lower compression. your rings probably arent seated yet. i think 9:1 will yield around 170 psi.

 

(please read)the gasket is one of their three layers with a metal fire ring deal.like i stated the motor ran good ,strong for 242 miles and and now it's on it's ***. i'm getting 150psi . from the four.how long does it usually take for the rings to seat? also i read this post here that stated the most important time for the rings to seat are in the first 20 or so miles under medium to hard driving ,is this true? i need to figure out the problem. could the lower comp. make the motor run slower and have less torque cause it won't even go up a hill,small one at that.

 

yup, lowering comp will drop your horsepower and torque. When you boost your car what you would do is run more boost to compensate for that loss.

 

thanks for the help ,i just wanted to make sure that the motor is running tops before i move any further with the turbo install so i can work out any bugs now while the setup is still simple.