I am thinking of buying a TC70 turbo, it has a A/R of .68 will i be ok with that on a street car 346. M6? looking to make 550whp.

 

TC76, F1 trim. Works perfect on a stock cube car and can easily meet your goals. Gives you room to go bigger in cubes later too. To beat all it costs the same.

 

Agreed!

 

Well i have a chance to buy a used TC70, will it be ok?

 

With the M6 I would go .81 A/R housing, I ran a .68 A/R on my stock LS1 with a GT67, it was fun from light to light racing, but on the freeway for passing it was not fun at all. @ 5200 RPM the power would go flat because the .68 was chocking it out. With the .81 A/R I am still full boost at 3600 RPM runing 10 PSI, with the .68 full boost by 2900 RPM. The .68 gave me good 60 foot, but most of the other cars could catch me on the back half of the track, with the .81 my 60 foot was nothing to brag, but that was made up on the back half.

 

Thanks guys i just got a T76 .98 a/r F1 trim

 

Good choice.