C6Z Scrub slick sizing, opinions and experiences?
#21
Instructor
- What are people using for alignment specs for the Pirelli.
- Has anyone run 10" F and 11" rear on a C6 Z06/GS
The reason I ask about the 10"/11" or 11"/11" combo is I have 4, 18"x10" and 4, 18x11" wheel that I used on track on my 13 Camaro 1LE. I would prefer to not have purchase new wheels for the GS if these will "work" for at least HPDE with scrubs. (offset places them at the fender with no rubbing and they have already been on the car)
Thank you,
Matt
#22
Burning Brakes
I have run and continue to run
Conti 305/645/18 and 305/650/18 fronts on 11" CCW
Conti 325/650/18 and 325/680/18 rears on 13" CCW
Pirelli DH 305/660/18 front
Pirelli DH 325/660/18 rear
I have the drop spindles. Highest that I would run in the back would be the 680 and you can still get some rub.
I like the Pirelli's better than any of the Conti's (GTO, 5000, 6000, etc.)
Conti 305/645/18 and 305/650/18 fronts on 11" CCW
Conti 325/650/18 and 325/680/18 rears on 13" CCW
Pirelli DH 305/660/18 front
Pirelli DH 325/660/18 rear
I have the drop spindles. Highest that I would run in the back would be the 680 and you can still get some rub.
I like the Pirelli's better than any of the Conti's (GTO, 5000, 6000, etc.)
What spring rate are you using in the rear? My Hoosier R100s were 27.6" diameter and the rubbed so I increased my rear spring rate from 700# springs to 800#and the rubbing stopped.
The Pirellis have a diameter of 27.83" or .23" greater then the Hoosiers . Hope they clear.
#23
Racer
I also have dropped spindles and just ordered Pirelli 325/705/18s for the rear because they are made for 13" wide wheels.
What spring rate are you using in the rear? My Hoosier R100s were 27.6" diameter and the rubbed so I increased my rear spring rate from 700# springs to 800#and the rubbing stopped.
The Pirellis have a diameter of 27.83" or .23" greater then the Hoosiers . Hope they clear.
What spring rate are you using in the rear? My Hoosier R100s were 27.6" diameter and the rubbed so I increased my rear spring rate from 700# springs to 800#and the rubbing stopped.
The Pirellis have a diameter of 27.83" or .23" greater then the Hoosiers . Hope they clear.
#24
Burning Brakes
My guess is that some folks may have <700 # rear springs. I should say I hope that is the case because I have two sets of tires arriving tomorrow . I will not know if they rub until the first event at The Glen.
I ordered the 705 Pirellis because they were the proper size for 13" wide wheels. The 660s are for 11.5-12.5 " wide wheels. Does Pirelli make a 325/680/18? I did not see it on the chart that I found on line.
wheel sec. width tread width diameter
325/660/18 11.5-12.5 12.75 11.81 26.30 DH
325/705/18 12.5-13.5 13.89 12.40 27.83 DH
Thanks for your reply
#25
Racer
My guess is that some folks may have <700 # rear springs. I should say I hope that is the case because I have two sets of tires arriving tomorrow . I will not know if they rub until the first event at The Glen.
I ordered the 705 Pirellis because they were the proper size for 13" wide wheels. The 660s are for 11.5-12.5 " wide wheels. Does Pirelli make a 325/680/18? I did not see it on the chart that I found on line.
wheel sec. width tread width diameter
325/660/18 11.5-12.5 12.75 11.81 26.30 DH
325/705/18 12.5-13.5 13.89 12.40 27.83 DH
Thanks for your reply
I ordered the 705 Pirellis because they were the proper size for 13" wide wheels. The 660s are for 11.5-12.5 " wide wheels. Does Pirelli make a 325/680/18? I did not see it on the chart that I found on line.
wheel sec. width tread width diameter
325/660/18 11.5-12.5 12.75 11.81 26.30 DH
325/705/18 12.5-13.5 13.89 12.40 27.83 DH
Thanks for your reply
#26
My guess is that some folks may have <700 # rear springs. I should say I hope that is the case because I have two sets of tires arriving tomorrow . I will not know if they rub until the first event at The Glen.
I ordered the 705 Pirellis because they were the proper size for 13" wide wheels. The 660s are for 11.5-12.5 " wide wheels. Does Pirelli make a 325/680/18? I did not see it on the chart that I found on line.
wheel sec. width tread width diameter
325/660/18 11.5-12.5 12.75 11.81 26.30 DH
325/705/18 12.5-13.5 13.89 12.40 27.83 DH
Thanks for your reply
I ordered the 705 Pirellis because they were the proper size for 13" wide wheels. The 660s are for 11.5-12.5 " wide wheels. Does Pirelli make a 325/680/18? I did not see it on the chart that I found on line.
wheel sec. width tread width diameter
325/660/18 11.5-12.5 12.75 11.81 26.30 DH
325/705/18 12.5-13.5 13.89 12.40 27.83 DH
Thanks for your reply
#27
Burning Brakes
Where did you get the canards for the front of you car?
Do you know Jim Beaton from Nepean Ontario?
Last edited by C6RAPTOR; 03-13-2017 at 03:44 PM.
#28
Racer
I was going to go to the Trackmasters May 22/23 event. I have not gone to a NASA event for over 8 years . I have been doing Trackmaster, BMW, PSA & CHIN. I will need to look it up to see the exact date. Late in April is best but not a guaranty that we will not have snow. I have seen snow in May.
Where did you get the canards for the front of you car?
Do you know Jim Beaton from Nepean Ontario?
Where did you get the canards for the front of you car?
Do you know Jim Beaton from Nepean Ontario?
The canards were on my car when I bought it from Richard L'abbe (one of the partners who own Calabogie race track near Ottawa). The car was built by Powell Motorsports. The canards are aluminum. They did a very good job balancing that car (aero, suspension). It's got vented hood and fenders, side skirts, front splitter and rear wing (Crawford composites).
I am going to put the race car up for sale this year. I promised my wife I would sell it last year but I am procrastinating. I am picking up a new 2017 GS this weekend and will use that as an occasional track car (don't need the truck, enclosed trailer, stacks of wheels and tires....).
Sorry, have not had the pleasure of meeting Jim Beaton of Nepean.
#29
Burning Brakes
I have been doing the NASA spring Watkins Glen event for the last 7 years. Bill Dearborn was my first instructor with NASA and I learned a lot from him (moved from HPDE1 to HPDE4 over the years). They have always run a good event and a group of us from the Toronto area have made the trip each year. Weather can be spotty (cold, wet, sometimes a little snow) but we always have a good time and it's a great track - even better with the new pavement.
The canards were on my car when I bought it from Richard L'abbe (one of the partners who own Calabogie race track near Ottawa). The car was built by Powell Motorsports. The canards are aluminum. They did a very good job balancing that car (aero, suspension). It's got vented hood and fenders, side skirts, front splitter and rear wing (Crawford composites).
I am going to put the race car up for sale this year. I promised my wife I would sell it last year but I am procrastinating. I am picking up a new 2017 GS this weekend and will use that as an occasional track car (don't need the truck, enclosed trailer, stacks of wheels and tires....).
Sorry, have not had the pleasure of meeting Jim Beaton of Nepean.
The canards were on my car when I bought it from Richard L'abbe (one of the partners who own Calabogie race track near Ottawa). The car was built by Powell Motorsports. The canards are aluminum. They did a very good job balancing that car (aero, suspension). It's got vented hood and fenders, side skirts, front splitter and rear wing (Crawford composites).
I am going to put the race car up for sale this year. I promised my wife I would sell it last year but I am procrastinating. I am picking up a new 2017 GS this weekend and will use that as an occasional track car (don't need the truck, enclosed trailer, stacks of wheels and tires....).
Sorry, have not had the pleasure of meeting Jim Beaton of Nepean.
Where do you get your Pirelli tires ? Have you used JB Racing Tires?
#30
Racer
#31
Burning Brakes
I always have kept my Hoosiers in a heated garage so I have never experienced any freezing related damage .
#32
Burning Brakes
The contis do last forever, and thats the issue. We run them until they are so hard, they simply have no grip, so an R/A7 has more grip at that point.
Correct.
The 700+ diameters will rub, as mentioned. If you have the car lowered at all, it will rip the inner fenders out.
Keep in mind that youll need a F/R split to keep the ABS/AH happy. a 660/680 works, or 650/680, 660/690.
Running the same diameter front and rear hurts the performance of the car.
Correct.
The 700+ diameters will rub, as mentioned. If you have the car lowered at all, it will rip the inner fenders out.
Keep in mind that youll need a F/R split to keep the ABS/AH happy. a 660/680 works, or 650/680, 660/690.
Running the same diameter front and rear hurts the performance of the car.
I am in the process of ordering 8 tires from GT Racing Tires and I have dropped spindels but do not want to screw up.
#33
Supporting Vendor
I would not run the 700/705/710 rear tire. Its faster, but its a big tire, and will have clearance issues.
On the drop spindles, check your inner wheel barrel to a arm clearance. We have to modify the lower control arm to fit the 18" wheels with drop spindles.
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"Keeping You on Track!"
http://www.gspeed.com
877-512-5180
Instagram_Facebook_YouTube
GSpeed C7Z Cooling Development
2014 NASA Texas TT1 Champion
2015 NASA Texas ST1 Champion
2018 NASA TTU & TT3 National Champions
2019 NASA ST2 National Champion
2019 NASA Texas TT2 Champion
2020 SCCA Majors COTA GT2 pole sitter
2020 SCCA Trans Am Road Atlanta SGT Winner
2022 NASA National Champion ST2
2023 NASA National Champion ST2
2023 NASA National Champion TT2
#34
Supporting Vendor
Edit: If its a C6, you definatelty will not clear the 700+ rear tires, but your control arms will be fine. Just run the suspension through its travel with no shock to verify. Your mileage may vary.
#35
Burning Brakes
Good advice. I have had the dropped spindles for a number of years and had performed the control arm wheel clearance task after I read a post by one of the Corvette Forum members from Norway stating that he did not know about the clearance problem until he wiped out his Corvette at the Nurburgring.
#36
Supporting Vendor
There are several variables with the control arm clearance. The inner wheel design, the thickness of the barrel, the camber you run, the ride height you run, the shock package you have, and where it bottoms out, or doesnt bottom out.
When performing modifications such as these, you should always check and recheck all of these variables. Its like torquing your wheels, or setting tire pressures or putting gas in. We all make sure those are done, but often times forget the bigger details that are unassuming.
When performing modifications such as these, you should always check and recheck all of these variables. Its like torquing your wheels, or setting tire pressures or putting gas in. We all make sure those are done, but often times forget the bigger details that are unassuming.
#37
Good advice. I have had the dropped spindles for a number of years and had performed the control arm wheel clearance task after I read a post by one of the Corvette Forum members from Norway stating that he did not know about the clearance problem until he wiped out his Corvette at the Nurburgring.
#38
Burning Brakes
It is about notching the LCA
The photo was taken with my 19" OEM wheels installed . When the 13" wide 18" diameter CCW wheels are installed the wheel will hit the lower control arm when the rear suspension is compressed.
The photo was taken with my 19" OEM wheels installed . When the 13" wide 18" diameter CCW wheels are installed the wheel will hit the lower control arm when the rear suspension is compressed.
Last edited by C6RAPTOR; 03-23-2017 at 12:21 PM.
The following 2 users liked this post by C6RAPTOR:
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#39
Burning Brakes
So I see suggestions for cars with drop spindles. But anyone have good suggestions for a C6Z with stock spindles and 18x11/18x13 CCWs? I believe with the stock spindles I'll have clearance with the lower control arm, but any suggestions on scrubs that work well with this setup (don't rub wheel wells)?
#40
What's your recommendations for track only rims and tires for my 2012 Z06 with PTM and Magna shocks...not racing, just for weekend fun? Im going to store thm at MSR garage
IE 18 or 19?
tires sizes?
scrubs or R7
...pita