We took my turbo b16 hatch to the dyno and as soon as vtec would engage it would loose about 60whp and then begin to pick up power again. We took the car off the dyno and did a compression test and the numbers were 130-125 psi in the cylinders. Could the rings not be seated properly? Also would that effect the vtec the way it is affecting it?

My tuner said to change my rings but i dont want to change the rings and still have the same problem. I wanted to figure out the problem so when i take apart the motor i can fix it. BTW i checked all my bearings and they are brand new.

The motor is a b16a2 with
skunk2 IM
rev valvetrain
stock cams and gears
new oil and water pumps
acl bearings
eagle rods
je 9:1 81mm pistons
AC block guard
The turbo is a 50 trim 48 a/r exhaust 50 a/r compressor
2.5in down pipe and catless exhaust
no name big front mount intercooler.

I thought maybe the timing was off but its not. We checked it a few times and it is set at 16*

 

you want to be around 180-225 psi in each cylinder with minimum diffrence between each cylinder

 

Did you have your cylinders honed after installing the block guard??? This could have caused them to oval a little causing your rings to not stay seated very well.

Did you install the guard after you installed your rings onto the pistons and had everything measured.

Just a thought.
with stock compression ratio you should be around 200 each with a 9.1:1 or so it should be relatively lower like around 175-180 maybe a little less or more but within like 5% of each other.

 

ya i installed the rings and pistons after the block guard.

 

ttt

 

has anyone else had this problem?