help! compression ratio??

[88nissan300zx]

I recently acquired a 1990 z32 and I need to send the ECU to JWT to get tuned but I need to figure out the compression ratio. All I know is that its a VG30ETT bored out 20 over and has this piston kit----http://www.z1motorsports.com/product_in ... ucts_id=39

Any help would be greatly appreciated!

[300ZXttZMAN]

You need to ask the previous owner... There is no way to really tell it could be stock or it could be higher, you will just have to ask to be sure.

[88nissan300zx]

All the owner told me was that it was bored 20 over and he gave me the link to the piston kit that was installed

[300ZXttZMAN]

Just ask him/her if he/she went with the standard compression ratio or if he/she ordered custom.. If he/she can't remember see if he/she will call Z1 and have them dig up the invoice.

Good luck!