12-04-2014, 10:04 AM | #1 |
Drives: callawayownersgroup.com Join Date: Nov 2009
Location: Daytona Beach, FL
Posts: 56
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Has anyone swapped a 3.45 rear gear into a ZL1
Ive been a Corvette guy my entire life. But now with 2 toddlers and a wife, the Vette is out.
Ive been thinking about a ZL1 as a daily driver(or CTS-V), but the gas mileage is honestly scaring me off as I drive quite a bit. My last Vette pulled as many as 31 mpg on the highway, and did 16-18 in stop and go traffic....really hard to go down to almost half of that. Has anyone swapped a 3.45 into a ZL1? Im just curious how much the mpg would improve. |
12-04-2014, 10:10 AM | #2 |
Drives: 2013 ZL1 M6, '99 Tahoe 2Dr Sport Join Date: Mar 2013
Location: South of Houston, TX
Posts: 890
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The Automatic ZL1's have 3.23 gears, the manuals, have 3.73.
There have been a few who own a manual that have swapped to the 3.23 gears, but that was usually done to increase top speed. (to go for 200mph) Hydra-Matic 6-Speed Automatic with TAP-Shift 6L90E (MYD)
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12-04-2014, 11:48 AM | #3 | |
Drives: 2012 (ZL-1) #468 Join Date: Apr 2012
Location: Veradale, Washington
Posts: 651
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Quote:
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12-04-2014, 11:53 AM | #4 |
Going for Plaid
Drives: 2011 C6 Join Date: Jan 2010
Location: Phoenix
Posts: 885
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I'm just starting to get into 1/2 mile and mile racing. I was thinking about finding somebody to swap my 3.73 diff for their 3.23 diff.
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2014 ZL1, manual trans, carbon hood insert, Rotofab, Pacesetter 1 7/8" headers, 1" drop BMR springs, stock pulleys, 91 octane tune, 545rwhp & 515rwtq
Serviced and modded by Cordes Performance. 2011 C6, 750rwhp, forged LS3, ported LSA heads, Vortech Ti-trim, 227/243 115+4 Lunati cam, ported LS3 intake, Alky Control methanol, Pfadt sways/shocks/trans mounts, Pfadt tri-y headers(Sold 6/28/14) |
12-04-2014, 12:32 PM | #5 |
Drives: 2013 ZL1 Join Date: Oct 2011
Location: tangent or
Posts: 2,984
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first off there is no 3.45 option for this diff 3.23 and 3.73 are it. you could mess with 6th gear in the tanny as well takit to .5 or so like the vett's.
my manaul gest 20hw and 15-16 mixed. you might get 21-22hw and 16-17 mixed with 3.23. there is no recipe to get 30mpg is boosted 4100lbs car. even a GT500 with 3.31's gets 23mpg's hyw and it was a couple hundred lbs less. I would look for less power and lighter if you want to keep in the better milage range. I am not sure waht the new chevy SS gets but n/a car are going to get better milage.
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shopping for 2017+1le or zl1
2009 CTS-V -sold 2015 Hellcat-sold 2013 ZL1 -sold 2007 Z06- sold 2014 Chrysler 300 2011 Duramax 8" lift, deleted tuned |
12-04-2014, 12:45 PM | #6 | |
Drives: callawayownersgroup.com Join Date: Nov 2009
Location: Daytona Beach, FL
Posts: 56
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Quote:
I love the look of the ZL1 and after owning a forced induction Vette, I am a huge fan of that type of power. It's easier to up the power and the need for gear isn't there. I have yet to drive one, but Im honestly a little scared to b/c my logic and rational thought are still intact. I fully expected to get blasted for making yet another post about gas mileage, but when Im staring down 100-300 hundred miles a week in commute, I can't afford that much gas. Attempting to justify that to my wife....well you know how that would go. Thanks for going easy on me. |
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12-04-2014, 12:48 PM | #7 |
Drives: 2014 Red Hot 1SS M6 Join Date: Jun 2014
Location: Daytona Beach, FL
Posts: 182
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I have an SS and not a ZL1 but it should be about the "smiles per gallon" hehe.
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2014 Red Hot 1SS M6 aka Bernadette
ADM LSA Conversion, ADM FPCM, 2.75 pulley, ZL1 fuel pump, FAST 89lb injectors, NGK TR7IX, Roto-fab intake, Stainless Power 1 7/8" long tubes w/o cats, NPP, Elite catch can, LG G5 Coilovers, Hurst shifter, GM strut tower brace, 1LE steering wheel, MRR 228 wheels, Nitto Invo 275/315. Tuned by Lashway Motorsports 575rwhp 528rwtq. |
12-04-2014, 01:19 PM | #8 |
Drives: Black 2012 ZL1 Join Date: Mar 2013
Location: Buffalo Grove
Posts: 433
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Weight and aero. Hard to make up for what the Vette has with a 4100lb brick. I came from a C6 as well and it's a bit of a surprise when I used to be able to get 400 miles out of a tank (430 was my best) and the same highway crusie is 280 in the ZL1. I needed the back seats as well so it was either that or go to a "regular" car.
There are times when filling up I think "damn, filling up again?!?!" but I know it's the price of admission. I just pick 3 days a week not to eat. |
12-04-2014, 01:46 PM | #9 |
Drives: 2013 zl1 Join Date: Sep 2013
Location: Missouri
Posts: 298
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12-04-2014, 01:49 PM | #10 | |
Drives: callawayownersgroup.com Join Date: Nov 2009
Location: Daytona Beach, FL
Posts: 56
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Im in a 4Runner right now and it gets terrible mileage too, but I burn 87 and the payment is only a 1/3 than that of a ZL1. |
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12-04-2014, 02:31 PM | #11 | |
Cartoon Maus
Drives: White ZL1, Chevroyota Prizolla Join Date: Aug 2013
Location: Charlotte, NC
Posts: 303
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Convince your wife of that. Other option? Get a commuting car and keep the Vette as your fun car. I recommend looking into the Elio, myself. I'd like to replace my 14-year-young BMW station wagon with an Elio next year... |
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12-04-2014, 03:07 PM | #12 | |
Drives: callawayownersgroup.com Join Date: Nov 2009
Location: Daytona Beach, FL
Posts: 56
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Quote:
With a Chevy, I know what Im getting into and living in Daytona Beach(a serious car town)...you need a little American badass-ery when you go cruising A ZL1 is a pipe dream most likely...There is a 1SS near my house that Im going to test drive here shortly. Will see if it fits the bill or not. Then I will get serious |
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12-04-2014, 10:24 PM | #13 | |
Drives: 2013 ZL1 Join Date: Oct 2011
Location: tangent or
Posts: 2,984
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the one downside though is the milage. I could get 24mpg's ont he hwy without trying in my z06. I have to practiaclly hypermile to get over 20mpg's. with my mods hwy is 19.5-20.5. which is real similar to stock. you could wait for milage figures to be released on the new GT350. should be 3600-3700lbs and get better milage. will have mag ride as well. or just factor in the extra fuel cost to the budget try to find a smoking deal.
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shopping for 2017+1le or zl1
2009 CTS-V -sold 2015 Hellcat-sold 2013 ZL1 -sold 2007 Z06- sold 2014 Chrysler 300 2011 Duramax 8" lift, deleted tuned |
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12-04-2014, 10:27 PM | #14 | |
Drives: 2013 ZL1 Join Date: Oct 2011
Location: tangent or
Posts: 2,984
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drive the 1le if the Zl1 is a pipe dream. the handling is really good and they wake up easy. you milage will be 3-4mpg better. the SS mods easy but I was really shocked how well the 1le works when I drove it. a heads, cam, header 1le would proabably lap faster than a zl1. the CSTV or zl1 brakes go right on with delco part numbers of amazon we did in on my freinds and ti was not bad. like $1700 and we sold his 1le brakes for $800. he only has headers right now but most people would be pretty happy with the way his car drives with the eception so might want a tick more power.
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shopping for 2017+1le or zl1
2009 CTS-V -sold 2015 Hellcat-sold 2013 ZL1 -sold 2007 Z06- sold 2014 Chrysler 300 2011 Duramax 8" lift, deleted tuned |
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