So just for fun I did a compression test on my new motor. It’s a stage 1 shortblock from IPP. I just turned 1200 miles on the motor, and I drove it easy for the first 750 miles as recommended by IPP. Once I hit 750 I started boosting, I am up to 11 psi now but I stopped there because the DW600's were maxed out (might need more fuel pump too - running a Walbro 255). It has Wiseco pistons so it should be 8.8:1 compression. I warmed up the engine, and pulled the coils/plugs without removing the plenum. I tried to do it as quickly as possible after shutting down the engine so it would be fully warm. I did the test twice, the first time with 7 cranks on each cylinder and the second time I did 5 cranks on each one. Numbers were as follows:

7 Cranks:

168
172
167
170
168
172

5 cranks:

166
160
162
161
165
162

These numbers are a little higher than I was expecting (I have read that anywhere between 130 and 160 is normal for a low compression built block) but higher is better right?!? Looks like the break-in procedure worked well!

 

Sorry, forgot to mention this is a VQ35DE. In a G35 6MT with an HKS GTRS twin turbo.