- Joined
- Sep 12, 2026
- Messages
- 1
- Points
- 1
- City
- Davenport
- State - Country
- IA- USA
- Vehicle Year
- 2002
- Vehicle
- Ford Ranger
- Drive
- 4WD
- Engine
- 4.0L
- Transmission
- Manual
Eaton M90 oval style 89-93 rebuilt
2002 FX4 Ranger 4.0 232k miles (lol)
Used a Modd Box install kit with a 3.4 inch/3.5 psi pulley
I know I'm late to the party with this, but I got beat by a Prius in a race to the exit just so they could cut me off and then slow down 30 mph. So... Supercharger! (I'd buy a new whatever but for reasons nobody cares about I'm not going to, so I waste my money on this)
Install went good; Cut to what matters: ONLY 1.5 psi BOOST!? Well, it's 2 psi about 5000 rpm but, man, 232k miles... (lol) I'm ASE certified so I kinda know stuff, but I'm not the worlds greatest service tech by any means and I'm not immune to stupid mistakes or over looking something. That being said, the engine runs better than expected and the supercharger appears in good working order (I have no experience with these superchargers or custom boost builds)
So if anyone has any experience with these setups (not holding my breath) I'd like to know if 1 - 2 psi boost is normal in this situation. Nothing appears wrong with the install: Midwest location - 600ft elevation. The boost measurement is accurate, the bypass appears to be working (I could be wrong here, but it closes/opens when the throttle is snapped at idle. I have not checked but I could video record the operation during WOT pull), the belt is not slipping, there are no vacuum leaks, no misfires, no codes, no warning lights, no noises (rattles/knocks/pings) It actually runs great, its just I was expecting closer to 3.5 psi boost since 3.5 psi pulley.
I figure this is either a normal outcome for the setup, the supercharger is just not moving air like it should and get a different one, or I'm over looking something stupid.
2002 FX4 Ranger 4.0 232k miles (lol)
Used a Modd Box install kit with a 3.4 inch/3.5 psi pulley
I know I'm late to the party with this, but I got beat by a Prius in a race to the exit just so they could cut me off and then slow down 30 mph. So... Supercharger! (I'd buy a new whatever but for reasons nobody cares about I'm not going to, so I waste my money on this)
Install went good; Cut to what matters: ONLY 1.5 psi BOOST!? Well, it's 2 psi about 5000 rpm but, man, 232k miles... (lol) I'm ASE certified so I kinda know stuff, but I'm not the worlds greatest service tech by any means and I'm not immune to stupid mistakes or over looking something. That being said, the engine runs better than expected and the supercharger appears in good working order (I have no experience with these superchargers or custom boost builds)
So if anyone has any experience with these setups (not holding my breath) I'd like to know if 1 - 2 psi boost is normal in this situation. Nothing appears wrong with the install: Midwest location - 600ft elevation. The boost measurement is accurate, the bypass appears to be working (I could be wrong here, but it closes/opens when the throttle is snapped at idle. I have not checked but I could video record the operation during WOT pull), the belt is not slipping, there are no vacuum leaks, no misfires, no codes, no warning lights, no noises (rattles/knocks/pings) It actually runs great, its just I was expecting closer to 3.5 psi boost since 3.5 psi pulley.
I figure this is either a normal outcome for the setup, the supercharger is just not moving air like it should and get a different one, or I'm over looking something stupid.
