Compression ratios HELP!
Compression ratios HELP!
Hi m30 Gurus. I’m about to pull the trigger on a set of cp Carrillo pistons for my m30b34 in prep for a turbo in the future. The only thing is off the shelf I can get a set with all the oem specs except the compression ratio which would be 8.5:1 my understanding is stock is 8:1. Would I still be able to use these pistons before I turbo and on stock tune? I’m not financially ready to turbo quote yet but I would like to drive my car around in the spring. Thank you all.
Re: Compression ratios HELP!
Sure, those will work fine. You might need to run mid grade gas instead of regular. Maybe, not for sure, just keep an ear out. But 8.5:1 will still have a dish in it, just not as big a dish. You should notice a little bit of HP improvement, not a lot, but some. Fuel is controlled by the AFM mostly, with fine tuning from the O2 input, so that's covered. Timing will be plenty close enough. I would guess it would bump you up into the high 180s compared to the stock 182HP, but still below 190. Should be nice, just like stock, but with a bit more.
Re: Compression ratios HELP!
Thank you Mike!