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Modded hellcat breaking belt tensioner

1752 Views 17 Replies 6 Participants Last post by SrtDex707, Nov 5, 2020

SrtDex707

Discussion Starter · Nov 2, 2020

Has any had this problem I’ve broken 2 already and it’s not the supercharger tensioner it’s the other one

1 - 18 of 18 Posts

Rockster

· #2 · Nov 2, 2020

What mod's?

One possible explanation is if you have a aftermarket pulley on the supercharger and it is not clutched when you let off the gas the inertia of the spinning supercharger causes a sudden shock to the accessory drive system which can cause a problem. If not a broken belt then I guess a broken tensioner.

SrtDex707

Discussion Starter · #3 · Nov 2, 2020

I have upper 2.65 lower 10%ati 1000cc injectors. First I thought it was a broken belt( it was shredded) the we looked closer the tensioner was broken and the damper moved as well replaced the tensioner and one pull it broke again and my power steering pump seized and again it’s my black belt not green

GreenMachine15

· #4 · Nov 2, 2020

Maybe you should hit #hpindy up about the underdrive pulley for the acc belt on the ati..

2015 Hellcat Challenger A8 Sublime. Engine: 2.85 Metco, 10%OD ATI, Metco Idlers, hpindy 15% UD acc crank pulley, TBA Lwr Idler, FI SC Spacers, 180 Thermo, 1050X Injectors, FAS Ported Snout, FAS Billet Bearing Plate, CFM 105mm TB, JLT CAI, JLT Oil Seperators, TBA Boost Ref Adptr - Tuning: OST Dyno Engine 93/C16 & Trans via MPVI2 Hp Tuners - Exhaust: JBA Catless Downpipes, Trackhawk Exhaust Tips - Drivetrain: 3.09 Rear Diff, DIRS & Race Brace, 1pc DSS Aluminum DS, BMR Modded Safety Loop, Petty Trans Brace - Suspension: Eibach Pro-kit Springs, Eibach Front Upper Adj Arms, BMR Rear Lwr Arms, BMR Subframe Connectors, Speedlogix Front Strut Brace, Petty Ent Rear 4pt Shock Tower Brace, Bwoody F/R Sway Bar Links, Short rears - Wheels/Tires: 10.5 Replicas, 305 Nitto 555R Drag, Black Lug Nuts, Blackout Center Caps - Exterior: Perf Wing, ZL1 Splitter/Rear Diffusr/Side Skirts/Rear Ext, Redeye Emblems, Blackout Front/Rear Emblems, AMD Fuel Door, Fastys LED Tubes, Tint, Oracle Markers

Reactions: 1

Himmelkat

· #5 · Nov 2, 2020

Rockster said:
pulley on the supercharger and it is not clutched

Why do people do this? are smaller pulleys too small to FIT a clutch? I agree that this would be a cause of stress avoided by the factory engineers by using a clutched pulley.

X42b

· #6 · Nov 2, 2020

SrtDex707 said:
I have upper 2.65 lower 10%ati 1000cc injectors. First I thought it was a broken belt( it was shredded) the we looked closer the tensioner was broken and the damper moved as well replaced the tensioner and one pull it broke again and my power steering pump seized and again it’s my black belt not green

You said the Damper moved? Is your crank pinned?

If it's not, I almost guarantee that you spun the hub on the crank and it backed out. This would either,

1) Spin the crank on the hub and it would walk the belt off and shred it.
2) Stop the belt completely and the inertia of the sudden stop would shred it.

If not that then, did you install the spacer on the pensioner for the accessory belt?

SrtDex707

Discussion Starter · #7 · Nov 2, 2020

Yea crank is pinned now it’s doubled pinned
QUOTE="X42b, post: 4332026, member: 99666"]
You said the Damper moved? Is your crank pinned?

If it's not, I almost guarantee that you spun the hub on the crank and it backed out. This would either,

1) Spin the crank on the hub and it would walk the belt off and shred it.
2) Stop the belt completely and the inertia of the sudden stop would shred it.

If not that then, did you install the spacer on the pensioner for the accessory belt?
[/QUOTE]

GreenMachine15

· #8 · Nov 2, 2020

Are you running the stock size accessory serpentine belt? I do not think a metco pulley would cause this, you would hear more from others having the same issue, and it is not the sc belt jumping off.. . I am curious what you meant by damper moved..... and your power steering pump seized...... ?
Maybe the ps pump is causing it all?

2015 Hellcat Challenger A8 Sublime. Engine: 2.85 Metco, 10%OD ATI, Metco Idlers, hpindy 15% UD acc crank pulley, TBA Lwr Idler, FI SC Spacers, 180 Thermo, 1050X Injectors, FAS Ported Snout, FAS Billet Bearing Plate, CFM 105mm TB, JLT CAI, JLT Oil Seperators, TBA Boost Ref Adptr - Tuning: OST Dyno Engine 93/C16 & Trans via MPVI2 Hp Tuners - Exhaust: JBA Catless Downpipes, Trackhawk Exhaust Tips - Drivetrain: 3.09 Rear Diff, DIRS & Race Brace, 1pc DSS Aluminum DS, BMR Modded Safety Loop, Petty Trans Brace - Suspension: Eibach Pro-kit Springs, Eibach Front Upper Adj Arms, BMR Rear Lwr Arms, BMR Subframe Connectors, Speedlogix Front Strut Brace, Petty Ent Rear 4pt Shock Tower Brace, Bwoody F/R Sway Bar Links, Short rears - Wheels/Tires: 10.5 Replicas, 305 Nitto 555R Drag, Black Lug Nuts, Blackout Center Caps - Exterior: Perf Wing, ZL1 Splitter/Rear Diffusr/Side Skirts/Rear Ext, Redeye Emblems, Blackout Front/Rear Emblems, AMD Fuel Door, Fastys LED Tubes, Tint, Oracle Markers

jakelind707

· #9 · Nov 3, 2020

I'm not sure it'll help, but I put a demon serp. belt tensioner on mine with green belt and I recall someone saying the demon tensioner spring is stronger and won't let as much slip. This is happening to your black belt? Its prob worn down and stretched pretty bad with those mods.

GreenMachine15

· #10 · Nov 3, 2020

Lots of confusion here...
Accessory belt
Tensioner keeps breaking
Power steering pump is locked up.

Sc belt is not coming off.

Thats where we are currently.

Your accessories are spinning at the same speed as stock regardless of sc pulley size or ATI lower, and run from the crank on their own pulley. A chop off the throttle should not effect that belt.

1. A bad tensioner is ruled out, since 2nd time
2. PS pump is locked up, was it going bad and dragging on the belt?
3. Belt is routed correctly and you had it in the grooves on every pulley?

This is not a common problem on modded hellcats.....

See less See more

2015 Hellcat Challenger A8 Sublime. Engine: 2.85 Metco, 10%OD ATI, Metco Idlers, hpindy 15% UD acc crank pulley, TBA Lwr Idler, FI SC Spacers, 180 Thermo, 1050X Injectors, FAS Ported Snout, FAS Billet Bearing Plate, CFM 105mm TB, JLT CAI, JLT Oil Seperators, TBA Boost Ref Adptr - Tuning: OST Dyno Engine 93/C16 & Trans via MPVI2 Hp Tuners - Exhaust: JBA Catless Downpipes, Trackhawk Exhaust Tips - Drivetrain: 3.09 Rear Diff, DIRS & Race Brace, 1pc DSS Aluminum DS, BMR Modded Safety Loop, Petty Trans Brace - Suspension: Eibach Pro-kit Springs, Eibach Front Upper Adj Arms, BMR Rear Lwr Arms, BMR Subframe Connectors, Speedlogix Front Strut Brace, Petty Ent Rear 4pt Shock Tower Brace, Bwoody F/R Sway Bar Links, Short rears - Wheels/Tires: 10.5 Replicas, 305 Nitto 555R Drag, Black Lug Nuts, Blackout Center Caps - Exterior: Perf Wing, ZL1 Splitter/Rear Diffusr/Side Skirts/Rear Ext, Redeye Emblems, Blackout Front/Rear Emblems, AMD Fuel Door, Fastys LED Tubes, Tint, Oracle Markers

Rockster

· #11 · Nov 3, 2020

SrtDex707 said:
I have upper 2.65 lower 10%ati 1000cc injectors. First I thought it was a broken belt( it was shredded) the we looked closer the tensioner was broken and the damper moved as well replaced the tensioner and one pull it broke again and my power steering pump seized and again it’s my black belt not green

I was referring to the accessory drive belt. The green belt is stronger and at least for a while better able to take the stress.

If the power steering pump seized that's not likely due to broken belt but more likely the cause of it and the broken tensioner.

jakelind707

· #12 · Nov 3, 2020

GreenMachine15 said:
Lots of confusion here...
Accessory belt
Tensioner keeps breaking
Power steering pump is locked up.

Sc belt is not coming off.

Thats where we are currently.

Your accessories are spinning at the same speed as stock regardless of sc pulley size or ATI lower, and run from the crank on their own pulley. A chop off the throttle should not effect that belt.

1. A bad tensioner is ruled out, since 2nd time
2. PS pump is locked up, was it going bad and dragging on the belt?
3. Belt is routed correctly and you had it in the grooves on every pulley?

This is not a common problem on modded hellcats.....

this is why I shouldn't forum pre-coffee....

apologies.

X42b

· #13 · Nov 3, 2020

GreenMachine15 said:
Lots of confusion here...
Accessory belt
Tensioner keeps breaking
Power steering pump is locked up.

Sc belt is not coming off.

Thats where we are currently.

Your accessories are spinning at the same speed as stock regardless of sc pulley size or ATI lower, and run from the crank on their own pulley. A chop off the throttle should not effect that belt.

1. A bad tensioner is ruled out, since 2nd time
2. PS pump is locked up, was it going bad and dragging on the belt?
3. Belt is routed correctly and you had it in the grooves on every pulley?

This is not a common problem on modded hellcats.....

Accessories are not spinning at the factory speed, unless the ATI 10% OD does not OD the accessories and only the blower. Is that the case?

GreenMachine15

· #14 · Nov 3, 2020

^^^^^^^^^^^

2015 Hellcat Challenger A8 Sublime. Engine: 2.85 Metco, 10%OD ATI, Metco Idlers, hpindy 15% UD acc crank pulley, TBA Lwr Idler, FI SC Spacers, 180 Thermo, 1050X Injectors, FAS Ported Snout, FAS Billet Bearing Plate, CFM 105mm TB, JLT CAI, JLT Oil Seperators, TBA Boost Ref Adptr - Tuning: OST Dyno Engine 93/C16 & Trans via MPVI2 Hp Tuners - Exhaust: JBA Catless Downpipes, Trackhawk Exhaust Tips - Drivetrain: 3.09 Rear Diff, DIRS & Race Brace, 1pc DSS Aluminum DS, BMR Modded Safety Loop, Petty Trans Brace - Suspension: Eibach Pro-kit Springs, Eibach Front Upper Adj Arms, BMR Rear Lwr Arms, BMR Subframe Connectors, Speedlogix Front Strut Brace, Petty Ent Rear 4pt Shock Tower Brace, Bwoody F/R Sway Bar Links, Short rears - Wheels/Tires: 10.5 Replicas, 305 Nitto 555R Drag, Black Lug Nuts, Blackout Center Caps - Exterior: Perf Wing, ZL1 Splitter/Rear Diffusr/Side Skirts/Rear Ext, Redeye Emblems, Blackout Front/Rear Emblems, AMD Fuel Door, Fastys LED Tubes, Tint, Oracle Markers

GreenMachine15

· #15 · Nov 3, 2020

X42b said:
Accessories are not spinning at the factory speed, unless the ATI 10% OD does not OD the accessories and only the blower. Is that the case?

This is incorrect.

Accessories are spinning factory speed from an ATI, it only 10% overdrives the SC belt.

2015 Hellcat Challenger A8 Sublime. Engine: 2.85 Metco, 10%OD ATI, Metco Idlers, hpindy 15% UD acc crank pulley, TBA Lwr Idler, FI SC Spacers, 180 Thermo, 1050X Injectors, FAS Ported Snout, FAS Billet Bearing Plate, CFM 105mm TB, JLT CAI, JLT Oil Seperators, TBA Boost Ref Adptr - Tuning: OST Dyno Engine 93/C16 & Trans via MPVI2 Hp Tuners - Exhaust: JBA Catless Downpipes, Trackhawk Exhaust Tips - Drivetrain: 3.09 Rear Diff, DIRS & Race Brace, 1pc DSS Aluminum DS, BMR Modded Safety Loop, Petty Trans Brace - Suspension: Eibach Pro-kit Springs, Eibach Front Upper Adj Arms, BMR Rear Lwr Arms, BMR Subframe Connectors, Speedlogix Front Strut Brace, Petty Ent Rear 4pt Shock Tower Brace, Bwoody F/R Sway Bar Links, Short rears - Wheels/Tires: 10.5 Replicas, 305 Nitto 555R Drag, Black Lug Nuts, Blackout Center Caps - Exterior: Perf Wing, ZL1 Splitter/Rear Diffusr/Side Skirts/Rear Ext, Redeye Emblems, Blackout Front/Rear Emblems, AMD Fuel Door, Fastys LED Tubes, Tint, Oracle Markers

X42b

· #16 · Nov 3, 2020

GreenMachine15 said:
This is incorrect.

Accessories are spinning factory speed from an ATI, it only 10% overdrives the SC belt.

Thank you for clarifying.

GreenMachine15

· #17 · Nov 5, 2020

I guess SrtDex707 lost interest.....

2015 Hellcat Challenger A8 Sublime. Engine: 2.85 Metco, 10%OD ATI, Metco Idlers, hpindy 15% UD acc crank pulley, TBA Lwr Idler, FI SC Spacers, 180 Thermo, 1050X Injectors, FAS Ported Snout, FAS Billet Bearing Plate, CFM 105mm TB, JLT CAI, JLT Oil Seperators, TBA Boost Ref Adptr - Tuning: OST Dyno Engine 93/C16 & Trans via MPVI2 Hp Tuners - Exhaust: JBA Catless Downpipes, Trackhawk Exhaust Tips - Drivetrain: 3.09 Rear Diff, DIRS & Race Brace, 1pc DSS Aluminum DS, BMR Modded Safety Loop, Petty Trans Brace - Suspension: Eibach Pro-kit Springs, Eibach Front Upper Adj Arms, BMR Rear Lwr Arms, BMR Subframe Connectors, Speedlogix Front Strut Brace, Petty Ent Rear 4pt Shock Tower Brace, Bwoody F/R Sway Bar Links, Short rears - Wheels/Tires: 10.5 Replicas, 305 Nitto 555R Drag, Black Lug Nuts, Blackout Center Caps - Exterior: Perf Wing, ZL1 Splitter/Rear Diffusr/Side Skirts/Rear Ext, Redeye Emblems, Blackout Front/Rear Emblems, AMD Fuel Door, Fastys LED Tubes, Tint, Oracle Markers

SrtDex707

Discussion Starter · #18 · Nov 5, 2020

nah just been busy but I’ve done a few pulls and have been driving it daily and the tensioner is holding up so we’ll see

GreenMachine15 said:
I guess SrtDex707 lost interest.....

1 - 18 of 18 Posts

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