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Thump RRR Heavy Duty Belt Tensioner


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#1 OFFLINE   sfadchi

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Posted 12 April 2010 - 04:07 PM

This is the second stock tensioner I have tore up so I decided to go another route. I picked up a new Thump RRR heavy duty belt tension from Lethal and it will be installed this week when the motor goes back together.

For anyone that wants to switch theirs out, it's the easiest thing to do. It's just one bolt that hold it on. This tensioner is also much stronger than the stock one so it will help prevent belt slip.

Thump RRR Racing 07-10 GT500 Heavy Duty Belt Tensioner [TR-GT500] : Lethal Performance, Performance parts for Ford Mustangs

Out with the old! Look at how easy that metal bends.

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Check out the quality of this piece!

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9.60@146.43 (On drag radials and the stock six speed)
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#2 OFFLINE   me32

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Posted 12 April 2010 - 04:26 PM

man looks very nice man,
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#3 OFFLINE   harley99fb

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Posted 12 April 2010 - 06:03 PM

Sweet....but pricey.....but guess that's the price of goin fast. :superhero:
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#4 OFFLINE   sfadchi

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Posted 12 April 2010 - 06:55 PM

Sweet....but pricey.....but guess that's the price of goin fast. :superhero:

Not much more than the stocker!
9.60@146.43 (On drag radials and the stock six speed)
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#5 OFFLINE   GR40Freak

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Posted 12 April 2010 - 08:00 PM

Anxious to hear how it work for you. You are one of the very few people that really use your car HARD. I'm looking to add the FRPP 550HP Whipple kit along with the Revan aftercooler to my Mustang and I hear the RRR tensioner is needed to make sure it works consistently.

Just to be clear you are doing something called "Drag Racing" I'm not familar with that. :)

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#6 OFFLINE   03 DSG Snake

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Posted 12 April 2010 - 08:57 PM

Looks like they finally started including a longer bolt.

When I received mine the bolt was a lot shorter. Tried to get a longer one but the one they are using is machined.

Sweet unit though, been happy with mine. :happy feet:
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#7 OFFLINE   justindewoody

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Posted 19 April 2010 - 03:06 PM

I have recently installed my ThumpRRR belt tensioner and it is super heavy duty. It's so damn tough...it will last FOREVER. I broke 3 stock tensioners the exact same way you did, so I absolutely had to get one of the ThumpRRR's. It's awesome. If anyone works on their own car and removes the belt for any reason, you are DEFINITELY gonna break your stock tensioner...sooner rather than later. And you will DEFINITELY need to go ahead and get one of these. It will be the last belt tensioner you will ever buy...cuz it's a bad mamma jamma!

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#8 OFFLINE   vapor08730

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Posted 27 April 2010 - 02:38 AM

I got one of these last week . I have to say the Thump RRR belt Tensioner is a very very nice piece. It is super heavy duty .
Very easy to install and fit like a gem. I will also say that my belt made noise and i would replace the belt and shortly after it would start to squeak . I tried all the things i saw on this board and it would never stay gone. This tensioner so far has made my noise disappear. No more noise YEAH !! We will see if it stays away and will let you guys know.
Very Very happy so far. Great product !!!!

#9 OFFLINE   TX STIG

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Posted 27 April 2010 - 05:24 PM

How well do some of the other brands work that are "pretty" and more visible closer to the SC?


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#10 OFFLINE   justindewoody

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Posted 27 April 2010 - 06:18 PM

How well do some of the other brands work that are "pretty" and more visible closer to the SC?



That's not really a tensioner, you are referring to an idler assembly. I have the Steeda one and it looks great, but only puts a small amount of tension on the belt.

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#11 OFFLINE   HARLEYDEALER

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Posted 27 April 2010 - 07:12 PM

That's not really a tensioner, you are referring to an idler assembly. I have the Steeda one and it looks great, but only puts a small amount of tension on the belt.

Actually the Steeda is conceder an tensioner, a manual one, the lower is spring loaded. The Steeda has the capabilities of over tighten the belt to the point of causing damage to bearings including the blower and shorten the life of the belt and pulleys. The upper ones are also used for add to belt wrap, unless you are running the new Kenny Bell 3.6, then there is no room as of now, but running the 4 inch upper belt wrap is not a problem. With the 10 under lower and the 4" pulley I'm still pulling over 20 pounds boost. Bill

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#12 OFFLINE   TX STIG

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Posted 28 April 2010 - 04:21 AM

That's not really a tensioner, you are referring to an idler assembly. I have the Steeda one and it looks great, but only puts a small amount of tension on the belt.


So what is this I just ordered?

http://www.lethalper...g-idler-p-27072

Does it not replace the idler pulley, or is it just extra bling? Do I still need the 90mm idler pulley if I'm adding a 2.6" upper pulley?

Edited by TX STIG, 28 April 2010 - 04:22 AM.


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#13 OFFLINE   skyhighsd

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Posted 28 April 2010 - 04:59 AM

So what is this I just ordered?

http://www.lethalper...g-idler-p-27072

Does it not replace the idler pulley, or is it just extra bling? Do I still need the 90mm idler pulley if I'm adding a 2.6" upper pulley?


No you run that also and it is not just bling it also helps with the amount of rap on the SC pulley which is always a good thing. More rap=less slip, period.

#14 OFFLINE   HARLEYDEALER

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Posted 28 April 2010 - 05:02 AM

So what is this I just ordered?

http://www.lethalper...g-idler-p-27072

Does it not replace the idler pulley, or is it just extra bling? Do I still need the 90mm idler pulley if I'm adding a 2.6" upper pulley?

It's an additional to your stock idler, that may have an adjustment as in three positions for the pulley to sit in. That will help with the extra slack due to a smaller upper, plus give more belt wrap. The 90mm you asked about, may or may not be needed. I know that with the 2.8 KB I ran different upper pulleys for racing and I used different pulley combinations to keep the belt tension were I wanted it, without the need to change belts. Bill

#15 OFFLINE   TX STIG

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Posted 28 April 2010 - 05:04 AM

OK, thanks guys!

I thought I was replacing the idler pulley with this kit. I will go ahead and get the 90mm idler pulley from VMP just to be safe.


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VMP Tune - 4.10 Gears - BMR Rear LCAs - Griggs Panhard Bar - IW 10% Pulley - Revan Racing Dual Fan HE
Aeroforce Interceptor - Roush Vent Pod - Forgestar F14 Wheels 20x11/9 - Nitto NT05 315/35 & 275/40
FRPP Tower Brace - FRPP Brake Cooling Kit - FRPP Resonator Eliminator - FRPP Blue Valve Covers
Dynatech LT Headers - High Flow Cats - VMP OE-Look IC Reservoir - Baer 2-Piece Rear Rotors
VMP 67mm Throttle Body - VMP 90mm Idler Pulley - Metco 2.6" Pulley - Metco Aux Idler
Magnaflow 4" x 18" Round-Body Resonators with OEM Mufflers - Custom H-Pipe
2010 SHELBY GT500, Navigation Package, HID's
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#16 OFFLINE   Captainbob

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Posted 28 April 2010 - 02:40 PM

I have recently installed my ThumpRRR belt tensioner and it is super heavy duty. It's so damn tough...it will last FOREVER. I broke 3 stock tensioners the exact same way you did, so I absolutely had to get one of the ThumpRRR's. It's awesome. If anyone works on their own car and removes the belt for any reason, you are DEFINITELY gonna break your stock tensioner...sooner rather than later. And you will DEFINITELY need to go ahead and get one of these. It will be the last belt tensioner you will ever buy...cuz it's a bad mamma jamma!


Pretty sure I need one.. Thanks for the scoop..

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