Q about 2lb pulley on a 4lb tune

[04mellowyellow]

I see on alot of sites claim that a tune is not required for an extra 2 psi of boost increase on a stock engine but I would like to use my handheld programmer. Since I'm going with an 2.75 upper pulley for now, which is my best option on a stock engine:

1. Install the performance tune with the 2.75 pulley
2. Install the 4lb pulley tune with the 2.75 pulley
3. No tune with the 2.75 pulley

 

[silveraider]

since you already have the tuner.. count out #3.. really no extra sweat re-tuning, if you wanna keep more drive-ability.. go with number #1... if you want more power it wont hurt the drive-ability that much to put on the 4# and the 2.75.. IMO #2

 

[Krwy]

I have a home ported Eaton, 2.8 upper and didn't need to change anything on my performance tune on my SCT X3. I actually pulled fuel because it was at 10:1 a/f on my wideband. I pulled 2% of fuel at WOT and see 11.1-11.6 a/f WOT. I really wouldn't worry about it, the stock handheld tunes are super rich.

 

[04mellowyellow]

So going with option 2 (4lb tune with 2.75 pulley) will net me more horsepower than option 1?

 

[04mellowyellow]

bump

 

[Krwy]

If you install the 2lb upper with a 4lb tune its gonna run way rich. Like I said, I TOOK away fuel when I added the 2lb upper on SCT X3 stock performance tune. If you have a wideband it will help LOADS when simple tuning it on your own.