Pulley gap at 1mm?
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Newbie
Joined: Oct 2016
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2007 sl55 amg
VRP Pulley gap at 1mm?
I installed a 76mm pulley and raceiq tune on my 07 sl55. The stock pulley had a .35 gap with one shim and was very smooth. I installed the VRP 76mm with no shims and its at 1mm. Actually was 1.1mm when I first installed it. The car now has a choppy acceleration over 1/3 throttle and bucks once when letting off of heavy throttle. Tuner says the gap is way too much and VRP says the pulley has to wear in? I didn't have this problem on my 03. Thoughts?
Last edited by jafo1970; Jun 3, 2020 at 08:36 PM. Reason: forgot a word
Junior Member
Joined: Nov 2018
Posts: 26
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E55 - Audi
I have the exact same VRP pulley with a .63 (25 thou) gap and the SC engagement can be noticeable depending on throttle position/revs.
76mm is quite aggressive and will give occasional heavy engagement IMO.
Not sure about the bucking when letting off throttle being related to the SC pulley and it's gap?
76mm is quite aggressive and will give occasional heavy engagement IMO.
Not sure about the bucking when letting off throttle being related to the SC pulley and it's gap?
Super Member
Joined: Aug 2018
Posts: 697
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From: Seattle, WA
2019 M5 Comp, 2005 Ariel Atom 2
I have the exact same VRP pulley with a .63 (25 thou) gap and the SC engagement can be noticeable depending on throttle position/revs.
76mm is quite aggressive and will give occasional heavy engagement IMO.
Not sure about the bucking when letting off throttle being related to the SC pulley and it's gap?
76mm is quite aggressive and will give occasional heavy engagement IMO.
Not sure about the bucking when letting off throttle being related to the SC pulley and it's gap?
Bucking I would point towards tune rather than gap. Pulley should stay engaged until stopping, same as stock, so gap would not be relevant. You could drive w/ STAR and watch for when it engages too to see if it's doing something it shouldn't.
