02-11-2016, 12:07 PM
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#12
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Drives: Supercharged 2013 AGM 2SS/RS
Join Date: Oct 2013
Location: Los Angeles, CA
Posts: 786
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Quote:
Originally Posted by clarkkent
Regarding the gears, theoretically, if you are crusing down the freeway at 70 in 6th gear with 3.43's you're pulling 1700 rpm's or something. You switch to 3.91's and you're pulling 2100 rpm's at the same speed. You are producing more emissions since you are at a higher rpm, so gears do in fact effect emissions. It's one reason why cars these days have such tall overdrives/double overdrives, not for "driver comfort". [those numbers are off the top of my head, but you get the idea]
That being said, not sure if CARB cares about that or not. But just wanted to point out that gears can effect emissions. Do they effect them that much? No, but still I could see the EPA caring about that to some degree
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Interesting. I am also guessing, and this is just a guess, that part of the issue may be that new gears require a new tune (if only for the speedometer). I think any part that requires a new tune may need a CARB E.O.
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2013 AGM 2SS/RS
SLP TVS2300, Edge CAI, 3" Magnaflow catback, BC Racing BR series coilovers, HRE FF15's (20x10 square) with Michelin Pilot Sport 4S's, GM STB, BMR front and rear sway bars and toe links, Prothane subframe bushings and front control arm inserts, JDP rear upper control arm bushings, Elite Engineering catch can. Tuned by Cunningham Motorsports.
1967 Bolero Red 396 SS/RS Convertible
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