85LSburb

iTrader: (1)

I am wondering what pulley you guys with a 5.3 were sent in your whipple kit. From what I can find i have about the largest one. Mine is 4.5. My whipple supplied tune is massively rich over 40% throttle. I wondering it’s due to having such a massive pulley. Just wanted to see what size some of you guys were supplied. Thanks.

ZO6Ted

4.375 on a 14

85LSburb

iTrader: (1)

Thanks. A guy in Florida also has that size. Fell like I got screwed on pulley sizes.

ZO6Ted

Well just keep in mind there is more to be had. Looking at dyno graph mine picked up ~ 60 tq and ~ 40 hp around 4200 it appears after tune. That was where there was the most improvement. Also my scanner says 7.5 lbs.

85LSburb

iTrader: (1)

Did you change your map sensor? Mine kept the stock one and stops reading at 118kpa. Think it converts to 2-3 psi. Just flat lines tell the boost comes down. I will probably just keep what I have tell I get my heads and cam in. Did put a lengthy gap on a hemi single cab today so I will just have to live with my pie pan pulley tell them.

ZO6Ted

I just googled a chart and that converts to 17psi so somethings off. Maybe your sensor is bad but Im no tuner so... I just installed my kit as it came with no mods whatsoever until a 1yr+ got a tune. Thats what I liked about the kit over the Mag. More boost and hp out of the box and no mods just turn on the key and burnout lol.

85LSburb

iTrader: (1)

I emailed whipple and they said all the 5.3 gen 3 blowers come with 4.5 and the older gen 2 came with 4.375. Feb 2018 is when they changed to the gen 3. I also googled the 118 and it said 17 but that’s absolute pressure and barometric pressure is around 14.8 so only reading 2-3 psi positive. I will get a 3 bar map sensor when I have it off for the heads. I may get a boost gauge and a afr wideband also. Need to fix the traction issues before I can add more power anyways.

ZO6Ted

Well mine is 4.375 so...lol on them huh unless I'm gen 2 blower? Gen 5 engine but idk. As far as psi? Yep 17 I'm an idiot. Didn't even cross my mind what was I thinking? Traction issues, mine is my daily work truck and it's always loaded to 6k with me. It still will spin them 40 ft loaded in 2wd from idle but I don't drive it that way. If I want to go it's 4wd for sure.

85LSburb

iTrader: (1)

Ordered some vas traction bars so maybe it will hook a little bit better.

supercharged680

iTrader: (1)

We are running a 4.000 pulley on the 5.3's with no issues using 93 fuel.