Quad Adrenaline Beta Testing....
1300* is about the max safe limit. 1800* is asking for trouble, as in you're lucky you didn't melt a piston kinda trouble.
On the serious side, you shouldn't hold your motor at more than 1250 for a long period. Short bursts to 1500 is ok as long as it's "short bursts" or you will cook a piston. My engine costed me $10,000 over a race with a Duramax. I held mine at 1500 for approx 1 minute and did extensive damage to the tune of $10,000.

on my part!!!
Put a charger on that thing. You have no idea how much power you are missing out on right now.
You are also going to need a clutch, you are not putting anywhere near the potential of the box to the ground on a stock clutch and a stock charger.
You are also going to need a clutch, you are not putting anywhere near the potential of the box to the ground on a stock clutch and a stock charger.


