Both the T66 and the 500R have it already installed on their car AQUAMIST 1S water injection with LED.

Just trying to decide, T66 or A-spec 500R. Differences? Which has better power range/better potential?

 

Your better off buying a stock car and work from there if its really hard to decide. You wont learn any hard lessons that are essential for life like trial and error. Id just personally go for the car that has the newest motor and the most reliability upgrades done to it with a knowledgeable owner. GL

 

Reason why I am going with an already done single FD is because the previous owner takes all the costs of getting the car to single. I save a lot more money this way and will be able to upgrade the turbo later down the line if needed.

So according to the previous owner with the T66, low boost is 15psi and he dynoed on 92 octane and got 364rwhp.

Then when he dyno'd 405rwhp he was running high boost it was set at 21psi and you need 100 octane according to Kan.

I don't know why, but for some reasons these numbers seem low don't they? I'm so used to seeing single turbo FD's in the 420+rwhp range. Attached is the dyno sheet for the high boost run