Strom Motorsports B48/B58 Alternator Overrun Pully

[Rensuhlo]

There should be plenty of room and the process is easier if you already have a 2 piece charge pipe.

Anyone know how to remove this? I dont see a cap or nut

Yank it

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[daobn24]

I yanked that knob and it worked!

Some added notes in bold

• Detension belt
• Remove plastic cap in center of alternator pulley (pry off with a pick)
• Hit nut inside current pulley with impact gun to spin it off (impact gun didn't fit the space)
• Use a pass through deep socket (22 mm) and hex key to get the current pulley off.
• Remove old pulley
• Thread on new pulley (we do not recommend loctite)
• Hold center of alternator shaft with a torque wrench in the off (counterclockwise) direction - the alternator shaft is a 10mm 6 point hex (do not use 12 point). Hold Strom Overrun pulley hex with 27mm open wrench and tighten to 38lb/ft - 50Nm
• If you do not have a torque wrench that can go in the off direction then hold it with a normal wrench and make it nice and tight, it is not a critical torque spec and the pulley will self tighten in use as the alternator spins and loads.
• Reinstall belt
• If you don't understand these instructions then do not install this yourself and have a mechanic do it.

 

[RyanA90]

I yanked that knob and it worked!

Some added notes in bold

• Detension belt
• Remove plastic cap in center of alternator pulley (pry off with a pick)
• Hit nut inside current pulley with impact gun to spin it off (impact gun didn't fit the space)
• Use a pass through deep socket (22 mm) and hex key to get the current pulley off.
• Remove old pulley
• Thread on new pulley (we do not recommend loctite)
• Hold center of alternator shaft with a torque wrench in the off (counterclockwise) direction - the alternator shaft is a 10mm 6 point hex (do not use 12 point). Hold Strom Overrun pulley hex with 27mm open wrench and tighten to 38lb/ft - 50Nm
• If you do not have a torque wrench that can go in the off direction then hold it with a normal wrench and make it nice and tight, it is not a critical torque spec and the pulley will self tighten in use as the alternator spins and loads.
• Reinstall belt
• If you don't understand these instructions then do not install this yourself and have a mechanic do it.

Thanks for the write up! Seems straight forward. Do you feel the difference?

 

[daobn24]

I haven't driven the car hard enough to really feel any diffence, maybe a tad smoother down shifts?

I can hear the alternator "whine" they mentioned in the vid.

 

[i3igpete]

maybe a tad smoother down shifts?

The clutches "should" be engaged on downshifts, and therefore "should" have identical behavior

 

[i3igpete]

I yanked that knob and it worked!

About to order the tools, any chance you can link me to the ones you bought? Any ones you particularly liked/disliked?

 

[daobn24]

I didn't use any special tool. If you can fit a plier to grip the plastic cap, a firm pull should do. I had to use a pick tool and small flat head screwdriver to get it out. Other than that, maybe a pass through deep socket?

They also updated their instructions PDF.

 

[i3igpete]

Ah ok. Wasn't sure if we needed an offset tensioner tool or thin-wall passthru socket.

 

[Hasan]

I don't understand the issue being addressed here. Would appreciate it if someone could explain it.

Thanks

 

[RyanA90]

I don't understand the issue being addressed here. Would appreciate it if someone could explain it.

Thanks

I googled it for you:

• Allows the alternator to freewheel: When you slow down or let off the gas, your engine RPM drops quickly, but the heavy spinning internal parts of the alternator want to keep spinning. This pulley lets the alternator spin freely on its own momentum instead of forcing it to instantly drag down with the engine.
• Saves your crank balancer: Without a freewheeling pulley, the sudden resistance from the alternator yanks hard against the serpentine belt and the harmonic balancer (crank pulley). Over time, that jerkiness causes severe stress and can damage or destroy the balancer.
• Smoother running and faster shifts: Because the engine isn't fighting the heavy, spinning weight of the alternator every time engine speed drops—like during rapid gear changes—RPM drops more cleanly. This reduces drivetrain vibrations and helps automatic transmissions shift quicker and smoother.

 

[Hasan]

I googled it for you:

• Allows the alternator to freewheel: When you slow down or let off the gas, your engine RPM drops quickly, but the heavy spinning internal parts of the alternator want to keep spinning. This pulley lets the alternator spin freely on its own momentum instead of forcing it to instantly drag down with the engine.
• Saves your crank balancer: Without a freewheeling pulley, the sudden resistance from the alternator yanks hard against the serpentine belt and the harmonic balancer (crank pulley). Over time, that jerkiness causes severe stress and can damage or destroy the balancer.
• Smoother running and faster shifts: Because the engine isn't fighting the heavy, spinning weight of the alternator every time engine speed drops—like during rapid gear changes—RPM drops more cleanly. This reduces drivetrain vibrations and helps automatic transmissions shift quicker and smoother.

Do you think it would allow the revs to drop faster on the MT cars?

 

[RyanA90]

Do you think it would allow the revs to drop faster on the MT cars?

Yup

 

[i3igpete]

Found a neat tip on YouTube, after you use a 16mm socket to rotate the tensioner pulley, you can shove an allen key in to hold it in place.

 

[Rizen]

• Use a pass through deep socket (22 mm) and hex key to get the current pulley off.

I have been looking to acquire a larger set of pass through deep sockets and I can't find anyone who makes them. GearWrench used to make a set that ran up to 29mm I believe but it's discontinued. Is there anyone who makes them now? If you don't have a pass through socket that size, what do you advise? My current set only goes to 19mm.

I just got mine yesterday and will be installing soon-ish.

 

[i3igpete]

The new instructions call out this specific socket

https://www.ecstuning.com/b-cta-tools-parts/go-through-deep-strut-socket-22mm/cta3039x06~cta/

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