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3.08 Gear

Discussion in 'Driveline' started by shts_weak, Jan 12, 2012.

  1. shts_weak

    shts_weak New Member Established Member

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    i currently have 3.55s and im debating if i should go with a 3.08? my car is a DD and it has 620rwhp..what are your thoughts/opinions?
     
  2. keith89

    keith89 Active Member Established Member

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    I have 3.73's and wish I stuck with 3.55's or went with 3.27's with 550rwhp. I don't know of anyone who has gone to 3.08's. Might be a bit extreme.
     
  3. mach1033

    mach1033 New Member Established Member

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    I'm going 327's come summer. 308's and you will have a nice top end charge. I'm willing to bet that you would be the first to go to a 308.
     
  4. shts_weak

    shts_weak New Member Established Member

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    im just looking for better gas mileage!
     
  5. Grimster

    Grimster New Member Established Member

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    with 620hp? :lol:
     
  6. shts_weak

    shts_weak New Member Established Member

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    im getting 17-19 city (out of boost) 25 hwy
     
  7. keith89

    keith89 Active Member Established Member

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    wow!!! that's pretty high.
     
  8. HURTNEM

    HURTNEM Well Blow Me Down!!! Established Member

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    I believe C6Zs come with 3.27s and Vipers come with 3.08s. I don't know of anyone with a Cobra that has tried 3.08s, but I'd imagine with your HP level it shouldn't bog off the line. You will definitely get much better traction and have longer gears which is great for the street. 0-60 in 1st gear will be a good time I'm sure!
     
  9. keith89

    keith89 Active Member Established Member

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    hmm interesting. something consider. I know i'm going from my 3.73's to at least 3.27's I'd like to know how 3.08's would be.
     
  10. Sagittaria

    Sagittaria New Member Established Member

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    Someone needs to compute the speeds. When power goes up even only to 500 1st gear is WAY to short and 5/6th gear... well they aren't really that much of an over drive to start with. I absolutely hate the ratios the 03 cobras came with.
     
  11. keith89

    keith89 Active Member Established Member

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    Agreed 1st gear is too short. I have a spreadsheet at home that calculates speeds in each gear. I'll have to remember to dig it up.
     
  12. shts_weak

    shts_weak New Member Established Member

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    Gear MPH
    1st 61.7
    2nd 92.1
    3rd 126.2
    4th 164.0
    5th 205.0
    6th 260.4

    Axle ratio 3.08 and [email protected]

    Tire size was 295/35/18
     
    Last edited: Jan 14, 2012
  13. Sagittaria

    Sagittaria New Member Established Member

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    That looks nice actually :rockon: I'm a big fan of the Corvette Z06 ratios... which it looks like almost (except they have actual overdrives :bash: ) Probably not the best for the strip w/ slicks but it'll get rid of the butt load of power coming way too soon everywhere else. Think they wanted the Terminators to be burnout machines only looking at the stock ratios/speeds :D

    C6Z06
    1st. 2.66 = 61 mph
    2nd. 1.78 = 91 mph
    3rd. 1.30 = 125 mph
    4th. 1.00 = 162 mph
    5th. 0.74 = 220 mph
    6th. 0.50 = 325 mph

    Us w/ 3.08s
    1st. 2.66 = 61 mph
    2nd. 1.78 = 92 mph
    3rd. 1.30 = 126 mph
    4th. 1.00 = 164 mph
    5th. 0.80 = 205 mph
    6th. 0.63 = 260 mph

    A 3.08 might be in order I think :rockon:
     
    Last edited: Jan 14, 2012
  14. shts_weak

    shts_weak New Member Established Member

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    yep. im excited!
     
  15. Blueline

    Blueline Active Member Established Member

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    One thought I had since these "higher rear gear" threads have come up. Our cars are known to have a very tight piston to wall clearance, hence the no boosting in 5th and 6th gear. These gears really lug the motor and generate alot of heat because of it. Lowering to the 3.27 or 3.08 gears, wouldnt this cause the same now to happen in say 4th or 3rd if you dont pull 2nd all the way to the top? Maybe not so much 3rd, but def. 4th gear? I may be way off my rocker or nuts for thinking this but figured I would ask. Granted these would only be a concern with stock motors with stock pistons/wall etc with no mods. Any thoughts on this guys?
     
  16. TVSCobra

    TVSCobra New Member Established Member

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    I have 327s and love them. Plan on whipple, POSI or what VMP is about to offer.
     
  17. mach1033

    mach1033 New Member Established Member

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    It would be more stressful than a stock geared 4th gear pull but not as bad as 5th/6th. Those overdrive gears do not stress the engine because of the additional time in the gear but rather because of the additional stress it causes to "chug" on the engine from overdriving it (each rev not creating 1 rev at the tailshaft of the trans. This stress finds the weak point in the engine. I.e. Piston to wall clearance. I quoted this from a tuner hope this helps.
     
    Last edited: Jan 14, 2012
  18. Blueline

    Blueline Active Member Established Member

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    :rockon: Thanks Al!
     
  19. earico

    earico Lake Bum Established Member

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    I agree. Don't forget about the increased wind resistance at those high speeds making the strain on the driveline even greater. It gets exponentially worse the faster you go.
     
  20. mach1033

    mach1033 New Member Established Member

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    My main reason for going to a 327 is traction. Plus I like the idea of keeping it in gear longer.
     

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