SC Pulley upgrade
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Member
Joined: Sep 2015
Posts: 104
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From: West Palm Beach
E55AMG, Lexus ES350, Lexus LS460, AudiA6
SC Pulley upgrade
Has anyone gone to an 80mm or 77mm SC pulley and NOT done a tune or ECM flash? Can you bolt on the new pulley and drive without doing a tune? Thanks
Super Member
Joined: Jun 2017
Posts: 899
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2005 E55
You can not spin the SC faster and not tune for it, unless you are looking for an excuse to replace the motor.
You can replace the pulley with a smaller one and drive if you are waiting for a tune. Do NOT go wide open throttle and it will be just fine (will run lean WOT). Like wise you can also drive with the SC pulley belt off without issue to be safe, and put it back on after you get your tune.
You can replace the pulley with a smaller one and drive if you are waiting for a tune. Do NOT go wide open throttle and it will be just fine (will run lean WOT). Like wise you can also drive with the SC pulley belt off without issue to be safe, and put it back on after you get your tune.
Super Member
Joined: Jun 2017
Posts: 899
Likes: 140
2005 E55
That's because the turns ratio is almost the exact same between what you have and what the tune is for. Your factory crank/83mm is 1.86 and the 168/90 (stock SC) would be 1.87, the OP question of an 80 or 77 is going from factory ratio of 1.59 to 1.93 or 2.0. Very, very different than your scenario.
