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Thread: G8 GT owners with 3.27,3.45 or 3.70 gears (diffs) come on in.... Need some info.

  1. 06-25-2010, 04:52 AM #21
    gr8lover
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    I went with the 3.27...... I was thinking it would be to hard to hook up with the 3.45 or 3.70's.... just an opinion though...
    2009 G8 GT; F1x procharger on Supercharger store direct drive system; 430cuin LSX; E85; 9" rear; DSS once pc driveshaft; 4L80
    9.2@151.... fastest and heaviest G8 known to man.... ...
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  2. 06-25-2010, 05:25 AM #22
    GRRRR8
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    Going with a 3.45 allows you to run a 27.2 or 28 inch tall tire without cutting your effective axle ratio. I think a big N/A HP car with N2O and 28 could use a 3.70, but 3.45 is your best bet.

    I just cant see spending $1100+ for for a .35 ratio increase. The rule of thumb has always been if you are not going up .5....dont bother unless you are building something that you are trying to keep in a certain rpm range and only need a .2-.3 ratio increase.
    2008 Liquid Red Pontiac G8 Sport/Premium - Adams Polishes - American Racing Headers - ARP - BMR Fabrication - Circle D Specialties - COMP Cams - Crazy Paul - Dynojet - Earl's - Flowmaster - Fuel Air Spark Technology - G2 - GFORCE 1320 - Greg Weld - HP Tuners - JBA - Lingenfelter - Maverick Man Carbon - Metco Motorsports Solutions - Mickey Thompson - M&H - Mike Norris Motorsports - NGK - Pace Performance - Pedders USA - Powerbond - PSI - Russell - SBX Performance - SJM Manufacturing - SPOHN Performance - Tony Mamo - Vararam - Vector Motorsports - Wretched Motorsports - 470 RWHP 427 TQ - Engine Tune By Patrick G
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  3. 06-25-2010, 05:27 AM #23
    wreckwriter
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    I agree with Charlie, 3.45 is best best for most people. 3.27 doesn't make much difference and 3.70 will pretty much need slicks. Hopefully George will get my 3.70 shipped soon and I can see how it does with 28" slicks.
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  4. 06-25-2010, 05:40 AM #24
    GRRRR8
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    I think the 3.70s will be wicked in your car Tom. Since the ProCharger is a big end blower, the 28in slicks and 3.70s are going to make it a beast! Since you do 1/8th mile most of the time you should be in the low 7s.
    2008 Liquid Red Pontiac G8 Sport/Premium - Adams Polishes - American Racing Headers - ARP - BMR Fabrication - Circle D Specialties - COMP Cams - Crazy Paul - Dynojet - Earl's - Flowmaster - Fuel Air Spark Technology - G2 - GFORCE 1320 - Greg Weld - HP Tuners - JBA - Lingenfelter - Maverick Man Carbon - Metco Motorsports Solutions - Mickey Thompson - M&H - Mike Norris Motorsports - NGK - Pace Performance - Pedders USA - Powerbond - PSI - Russell - SBX Performance - SJM Manufacturing - SPOHN Performance - Tony Mamo - Vararam - Vector Motorsports - Wretched Motorsports - 470 RWHP 427 TQ - Engine Tune By Patrick G
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  5. 06-25-2010, 05:41 AM #25
    wreckwriter
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    Quote Originally Posted by GRRRR8 View Post
    I think the 3.70s will be wicked in your car Tom. Since the ProCharger is a big end blower, the 28in slicks and 3.70s are going to make it a beast! Since you do 1/8th mile most of the time you should be in the low 7s.
    That's what I'm hoping for too!
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  6. 06-25-2010, 02:16 PM #26
    familycaronROIDS!
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    Yeah thats pretty much what my tuner said also. He suggested I go with the 3.45's over the 3.27 & the 3.70's. So far he has been right on with all his suggestions so I will see when I run it at the track mid July...

    2009 G8 GT
    Wrenched&tuned@CMS w/N2o
    518rwhp-450rwtq
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  7. 06-25-2010, 03:17 PM #27
    SRG963
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    Anyone have a print out of speed vs rpm's with the different gear ratios? I'd like to compare 80mph.
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  8. 06-25-2010, 03:34 PM #28
    13 QTR
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    Quote Originally Posted by SRG963 View Post
    Anyone have a print out of speed vs rpm's with the different gear ratios? I'd like to compare 80mph.
    In 6th....I'm at 2200@80
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  9. 07-05-2010, 06:20 AM #29
    vic2186
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    Put me on the list 3.45 baby
    2008 G8 GT
    Birth-9-19-08
    Death-3-20-12-Accident

    My Baby is Gone
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  10. 07-05-2010, 11:45 AM #30
    familycaronROIDS!
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    woot woot next Tuesday is d instal date. FIngers crossed that everything will come out ok and the tune will be dialed in...

    2009 G8 GT
    Wrenched&tuned@CMS w/N2o
    518rwhp-450rwtq
    11.4@121mph DA2400+
    sound clip:
    http://www.youtube.com/watch?v=h8trh7SkzQg
    racing
    http://www.youtube.com/watch?v=DA5td_Jm1OE
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