[Z OH 6]

Originally Posted by ICTsccaCamaro

In the Hellcat world (I've got a TRX) we have a lower crank pulley sleeve that bolts over the factory crank pulley, you add the new length belts and it adds about 1.5psi of boost good for about 50-60hp. The factory tune has just enough fuel it can add to compensate for the slight boost increase and keep AFR's happy. Does the factory ZL1 tune have any room to compensate for a slight boost increase?

You really need to get the crank pinned and use a proper aftermarket pulley. The stock damper and pulley has been known to spin on the Hellcat engine, even stock, but when you start adding more power, the chance increases. Pinning the crank really is a must if you do any mods to those engines.

[arpad_m]

Originally Posted by ICTsccaCamaro

In the Hellcat world (I've got a TRX) we have a lower crank pulley sleeve that bolts over the factory crank pulley, you add the new length belts and it adds about 1.5psi of boost good for about 50-60hp. The factory tune has just enough fuel it can add to compensate for the slight boost increase and keep AFR's happy. Does the factory ZL1 tune have any room to compensate for a slight boost increase?

Originally Posted by Z OH 6

You really need to get the crank pinned and use a proper aftermarket pulley. The stock damper and pulley has been known to spin on the Hellcat engine, even stock, but when you start adding more power, the chance increases. Pinning the crank really is a must if you do any mods to those engines.

Yes, here's a nice install video about this with details that I recall watching back in 2019:

[ICTsccaCamaro]

Originally Posted by Z OH 6

You really need to get the crank pinned and use a proper aftermarket pulley. The stock damper and pulley has been known to spin on the Hellcat engine, even stock, but when you start adding more power, the chance increases. Pinning the crank really is a must if you do any mods to those engines.

Most say if you are staying stock upper pulley and only going incognito lower, as long as it is properly installed and torqued with a new OEM crank bolt you will have no issues. But yes if you are also changing upper you absolutely need to pin.

[Z OH 6]

Originally Posted by ICTsccaCamaro

Most say if you are staying stock upper pulley and only going incognito lower, as long as it is properly installed and torqued with a new OEM crank bolt you will have no issues. But yes if you are also changing upper you absolutely need to pin.

And if you listen to Ripa, you're in for a bad time. His name is MUD among the Hellcat community. You're playing with fire, but it's your money.