255/40/18 - Page 2 - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #21 of 29 (permalink) Old 01-14-2013, 10:49 AM
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Thanks for confirming workability of the 245/45/18 all round the GT. The only variant on a couple of the combinations mentioned seem to be actual speed versus what the speedometer is telling us assuming 18"X 8" wheels. See link below and type in a few size variants.
http://www.1010tires.com/tiresizecalculator.asp
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post #22 of 29 (permalink) Old 01-14-2013, 12:44 PM Thread Starter
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Ya at the time wasn't worried about that now I am

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post #23 of 29 (permalink) Old 01-14-2013, 02:10 PM
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What camaro's are those (polished, silver)? Very nice view in this pic. What do u have to the left of the license plate?

2008 LR GT

Pat G tune, LS7 MAF, RCR P/P/Milled LS3 Heads & valve job, ported AirRam Intake / TB & Little Lunati cam, Pypes LT's, Solo CB, Spectre CAI, Powerbond UDP

BMR rear cradle bushings, BMR F&R Swaybars, Teins & FE3's
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post #24 of 29 (permalink) Old 01-14-2013, 03:24 PM
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This is the tire calculator I use. http://www.rimsntires.com/specs.jsp

09 G8GT SwitchBlade Silver/Sunroof:
SSV Z-Series ll rims (Chevy SS rims), GXP rear diffuser, Chrome G8 gas cap cover, Console sliding leather lid, Holden Engine Covers, Intake cover delete, Automatic dimming mirror, Holden VE Onyx Leather Sports Steering Wheel, SLP spoiler

RotoFab CAI, HSRK, MagnaFlow cat back, Kooks 1 7/8 mids w/HFC, GXP Brembos with drilled rotors, VMS Stage 2 tuned, Mobil 1
60'-1.954 1/4-12.753 @ 109.42mph
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post #25 of 29 (permalink) Old 01-14-2013, 04:00 PM
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^ Same one I use and it is the best I have found.

2009 G8GT:
364--forged rods/pistons stock crank.(Rick Crawford) Ported Heads,(Modified) Intake, TB. Vararam, Custom Cam, Kooks 1 3/4 LT, 2.5in custom exhaust, Yank 3000 TC, BMR SFC, H&R Springs. DDM HID's 8k-LB 3k-Fogs.


Dynoed 435whp 386wtrq with above setup 12.8@116 2.2 60ft BTTD.

Cam,Stall,LTH,CAI,Tune. Best time 12.7@110 1.9 60ft. Old Setup.

Dynoed 370whp 380wtrq
(w/LTH,CAI,Tune)Best time 13.1@105 Old Setup.


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post #26 of 29 (permalink) Old 01-14-2013, 07:54 PM Thread Starter
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Camaro 20s , I took all the CLear off , but there polish
And next to plate (police interceptor ) sticker , my dad fixes police cars , I get from police cars hit from rear

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post #27 of 29 (permalink) Old 01-14-2013, 08:01 PM Thread Starter
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post #28 of 29 (permalink) Old 01-14-2013, 08:12 PM Thread Starter
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post #29 of 29 (permalink) Old 03-15-2013, 03:00 PM
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For those that run with the GT edition the car came with 245/45/18. A switch using same 18" X 8" wide wheels to something like BF Goodrich g-force Sport Comp -2 in 255/45ZR/18 will yield a 1.312 % slower speed on the speedometer since the actual wheel diameter shrinks by 1.3%. Can anybody out there comment on any other material changes in operation of the car with this or more significant tire size changes ? For example, computer throwing any trouble codes, electronic brake assist or electronic stability control
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