Engine compression with a Turbo.

[Expurple]

Hello everyone.

I'm in the process of rebuilding my engine. The car will see turbo boost.

What's a good compression ratio that I can use so that if I decide to remove the Turbo in the future the car will not be slow naturally aspirated.
I'm assuming 9 is the stock compression ratio.

My current goals are 550 with 60 lb injectors and methanol injection. My future goal is 650 rwhp with the appropriate fuel system.

 

[Tabres]

In my opinion, it would heavily depend on the quality of gasoline in Turkey.

Mine is 9.3:1. I drove it n/a for a while before I installed the turbo and with a T56 and 4.10 gear it was nothing to shout about, but it was quick enough. Felt like a normal bolt-on car.

 

[Expurple]

The has I use is 97-98 octane, the U.S. equivalent is 91-92 octane. I will definitely be using water/methanol injection if it will help in any way.

 

[Modular Racing]

Stock is 9.8 t 1, a good average for both is 9.5 to 1, you could even run 10 to 1 if you decided to run e-85.

Best of luck!

MMR
Modular Motorsports Racing

 

[TurboSVT96]

I'm at 11:1 CRs on 15lbs on 93 pump gas. Only running 10 degrees total timing tho. Laid down 569 rwhp thru a auto, stock converter and 3.27s. It's all in the tune.

 

[itSSlow98]

Mine is 10:1 on 93+meth. I plan on running 16-17psi on the street and maybe a 21psi race tune still on 93+meth. For a street car and using meth i would do 10:1 for sure.

BTW 100% meth is what I strongly recommend. Skip the 50/50 for a turbo car.