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      10-15-2019, 07:50 PM   #140
Private First Class

Drives: 15 BMW M4
Join Date: Sep 2016
Location: Santo Domingo, Dominican Republic

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Originally Posted by F30_SixSpeed View Post
Good eye... timing and knock resistance is much better with a little ethanol mixed in. No updated logs, I'll try and grab some on a cooler night.

After all the expensive hardware upgrades, I rather spend money for a tune done right

Jb4 is okay, it makes the cars run inconsistent. I have nothing against them and I ran JB4 for nearly 2 years. My experience with JB4 was the car was not as smooth and ran inconsistent. Plus they are known the fry and cause electrical shorts. My car runs much better without it once I removed it. Could I pick up more power and use as a boost controller with it? Maybe. But that's not a big enough reason to put it back in for me.
If your car run inconsistent you most have a diferent problems.
I had over 20 paseses between 10.6 and 10.7 day, night, different tires, etc.
Also in M3 S55 full weight 10.11@140.5mph over 20 passes running with JB4 in 10.1 and 10.2 range.
Maybe you need understand how JB4 operates... but anyways use whatever you fell is better for you.
13 BMW 335ix Full Weight 10.64 @129mph N55 WR SOLD
A90 Supra Full Weight No Nitrous 10.78@133mph
BMW M4 stay tuned

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