Corner Weights, Alignment, C6 weight...
Thread Starter
Safety Car
Joined: May 2005
Posts: 3,520
Likes: 3
From: Redwood City CA
Corner Weights, Alignment, C6 weight...
C6 Z51, DRM coilovers, DRM/RD Combo Radiator, Wilwood SL6R front brakes, Pfadt Original Pfatty Swaybars, HardbarUSA Harness Bar & Belt Mounts, Pfadt Poly Bushings. Full, stock interior. CCW C140 18x10+18x11 wheels with Toyo R888s 275/35r18+305/35r18 tires. Almost completely full tank of gas.
Aligned:
Front: -1.8deg, 1/32" toe-in, 7.5deg caster, 4.5" to frame by jacking
Rear: -1.3deg, 1/16" toe-in, 4.5" to frame by jacking
Corner Weights (with 165# driver):
LF 909#, RF 893#
LR 838#, RR 812#
Total 3452# *oink*oink*
Front 1802# (52.2%)
Rear 1650# (47.8%)
Left 1747# (50.6%)
Right 1705# (49.4%)
Cross 1731# (50.1% of total)
We'll see how she feels at Thunderhill Friday. If folks remember I was struggling with tire rub on the fenders and eventually solved it, but I pulled the front wheels in too far and was rubbing the wheelhouse. Yesterday we solved that and re-aligned and balanced. Friday we'll see if we really solved it and are keeping the wheel away from the fender.
I'm pretty happy today. The numbers looks good and the car feels good in street driving...
Aligned:
Front: -1.8deg, 1/32" toe-in, 7.5deg caster, 4.5" to frame by jacking
Rear: -1.3deg, 1/16" toe-in, 4.5" to frame by jacking
Corner Weights (with 165# driver):
LF 909#, RF 893#
LR 838#, RR 812#
Total 3452# *oink*oink*
Front 1802# (52.2%)
Rear 1650# (47.8%)
Left 1747# (50.6%)
Right 1705# (49.4%)
Cross 1731# (50.1% of total)
We'll see how she feels at Thunderhill Friday. If folks remember I was struggling with tire rub on the fenders and eventually solved it, but I pulled the front wheels in too far and was rubbing the wheelhouse. Yesterday we solved that and re-aligned and balanced. Friday we'll see if we really solved it and are keeping the wheel away from the fender.
I'm pretty happy today. The numbers looks good and the car feels good in street driving...
Tech Contributor
Joined: Oct 1999
Posts: 41,066
Likes: 9,829
From: Charlotte, NC (formerly Endicott, NY)
Not all that bad on the weight considering the driver is in the car. Without the driver we are talking about less than 3300 lbs. Also aren't you supposed to set the weights with a half tank of gas Vs almost full? At 6 lbs per gallon you would be close to 3250 at a half tank.
Bill
Bill
Thread Starter
Safety Car
Joined: May 2005
Posts: 3,520
Likes: 3
From: Redwood City CA
So, I thought the half tank thing, too, but RAFTRACER explained to me the last time I posted about this that with the saddle tanks and how the C5/C6 fuel system works you either want to be completely full or completely empty unless you always run with half a tank of gas. Since the tanks are saddled and one side empties in to the other and only then heads up to the fuel rails I guess full or empty gets the best results.
I put a few more miles on the car driving it in to work today and it is feeling really really nice... I can't wait for Friday...
I put a few more miles on the car driving it in to work today and it is feeling really really nice... I can't wait for Friday...
Thread Starter
Safety Car
Joined: May 2005
Posts: 3,520
Likes: 3
From: Redwood City CA
C5stein and Randy@DRM both recommended toe-in; I set 1/32" toe-in over a year ago and have been very happy with it for my dual-purpose car. I find it turns in just fine, which is where toe-out would help the most. Toe-in adds some stability for high-speed and braking, too, making the car easier to drive. I suspect if I was doing any autocross I'd be leaning towards toe-out in the front.
Heel & Toe
Joined: Oct 2008
Posts: 19
Likes: 0
C6 Z51, DRM coilovers, DRM/RD Combo Radiator, Wilwood SL6R front brakes, Pfadt Original Pfatty Swaybars, HardbarUSA Harness Bar & Belt Mounts, Pfadt Poly Bushings. Full, stock interior. CCW C140 18x10+18x11 wheels with Toyo R888s 275/35r18+305/35r18 tires. Almost completely full tank of gas.
Aligned:
Front: -1.8deg, 1/32" toe-in, 7.5deg caster, 4.5" to frame by jacking
Rear: -1.3deg, 1/16" toe-in, 4.5" to frame by jacking
Corner Weights (with 165# driver):
LF 909#, RF 893#
LR 838#, RR 812#
Total 3452# *oink*oink*
Front 1802# (52.2%)
Rear 1650# (47.8%)
Left 1747# (50.6%)
Right 1705# (49.4%)
Cross 1731# (50.1% of total)
We'll see how she feels at Thunderhill Friday. If folks remember I was struggling with tire rub on the fenders and eventually solved it, but I pulled the front wheels in too far and was rubbing the wheelhouse. Yesterday we solved that and re-aligned and balanced. Friday we'll see if we really solved it and are keeping the wheel away from the fender.
I'm pretty happy today. The numbers looks good and the car feels good in street driving...
Aligned:
Front: -1.8deg, 1/32" toe-in, 7.5deg caster, 4.5" to frame by jacking
Rear: -1.3deg, 1/16" toe-in, 4.5" to frame by jacking
Corner Weights (with 165# driver):
LF 909#, RF 893#
LR 838#, RR 812#
Total 3452# *oink*oink*
Front 1802# (52.2%)
Rear 1650# (47.8%)
Left 1747# (50.6%)
Right 1705# (49.4%)
Cross 1731# (50.1% of total)
We'll see how she feels at Thunderhill Friday. If folks remember I was struggling with tire rub on the fenders and eventually solved it, but I pulled the front wheels in too far and was rubbing the wheelhouse. Yesterday we solved that and re-aligned and balanced. Friday we'll see if we really solved it and are keeping the wheel away from the fender.
I'm pretty happy today. The numbers looks good and the car feels good in street driving...
Glad to see this note. I have a C6 Z51 as well and I am switching to 18 in wheels all around (cost less). I am currently running 275 35 in front and will run 315 30 in back. I previously ran 305 30 19s in the back and I have not had issues. Also getting LG coilovers.
Question is, do you have to do anything unique to the suspension now that you are running 2 inch smaller diameter wheel/tires in the back?
Thanks a bunch!
Thread Starter
Safety Car
Joined: May 2005
Posts: 3,520
Likes: 3
From: Redwood City CA
Dig up the post that talks about Z and D trim heights; you might want to set things based on those rather than the frame rail heights. I think you'll run into traction control issues (if you run it) with the rear tire being a smaller diameter than your fronts...
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Thread Starter
Safety Car
Joined: May 2005
Posts: 3,520
Likes: 3
From: Redwood City CA
Check the tire manufacturers claims. Also, for TC to work you need a difference in size front:rear. I show 275/35r18 as 25.6in tall and 315/30r18 as 25.4in tall ... a shorter rear tire will confuse the computer unless you turn off all the TC. Stock the rear tire is almost an inch taller than the front... if somebody would build a 315/35r18 it would sure make us C6 folks happy... run a 315/30 on the front and a 315/35 on the back and still have all the toys at your disposal should you choose to use them.
Heel & Toe
Joined: Oct 2008
Posts: 19
Likes: 0
Hadn't thought to check with manufacturer specs. Using 1010 tire and the difference on that site is 0.13 inches. I am going to use Toyo R888s and according to their specs it is a 0.2 inch difference (difference may be with decimal round-off).
Think I am going to try and see if this difference affects the TC. I normally always run with it off anyway (except cold or wet track). Another option I guess is to go with a 265 35 in front???
Think I am going to try and see if this difference affects the TC. I normally always run with it off anyway (except cold or wet track). Another option I guess is to go with a 265 35 in front???