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Old 02-18-2014, 09:41 PM   #15
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Originally Posted by brt3 View Post
One interesting thing about this press release is that it indicates, to me at least, that magazine tests should begin shortly. Can't wait to start seeing actual tests of this beast in the buff mags.
Agreed, plus the final N-ring number.
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Old 02-18-2014, 10:19 PM   #16
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Also, it sounds like the differential they described is like the Eaton Truetrac, with gears instead of clutch disks. Anyone have insight on how it might compare to the Truetrac?
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Old 02-18-2014, 10:30 PM   #17
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This made me laugh, a stock SS is supposed to stop around 120 ft from 60, I would hope to God the Z/28 stops under 120 ft. It better stop under 110, Hoping for 105 ballpark. Honestly under 100 ft would not surprise me, I know that is a lot to ask but this has bigger and allegedly better brakes than the GT-R. Not to mention the GT-R brakes from 60 right under 100 ft, + the GT-R and Z/28 weigh roughly the same, + the Z/28 will have bigger stickier tires.
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With those brakes it's gotta be damn close to 100 ft.
Didn't Motortrend stop a 1LE from 60-0 in 101ft?



Speaking of which, I'm surprised that the Z28 is only 55lb lighter then a SS, even taking into consideration its increased mass on certain components for structural rigidity, etc.
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Old 02-19-2014, 12:10 AM   #18
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Why would they use smaller-diameter sways than the 1LE? What is the performance advantage?
I remember JusticePete saying something along the lines of with an optimized suspension set up, the sway bars don't need to be as big.
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Old 02-19-2014, 12:28 AM   #19
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Agreed, plus the final N-ring number.
I wonder about that. If and when they release the final Ring time for a dry track, I think they'll want video. So, unless they've been holding back on us and sandbagging (by saying that stitching all their good sectors together should give a 7:31.xx), I have to think they'll return to the Ring in May to run some final, good weather hot laps for posterity...
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Old 02-19-2014, 05:32 AM   #20
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Didn't Motortrend stop a 1LE from 60-0 in 101ft?



Speaking of which, I'm surprised that the Z28 is only 55lb lighter then a SS, even taking into consideration its increased mass on certain components for structural rigidity, etc.
Yes Motortrend did get 60-0 in 101ft with a 1LE.

Im looking forward to Motortrend running the Z28 on VIR, we know where the 1LE and ZL1 stands.
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Old 02-19-2014, 05:36 AM   #21
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Old 02-19-2014, 08:47 AM   #22
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so it weighs 3,820.
I thought they said last year it would be a hundred pounds less than the SS.
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Old 02-19-2014, 09:30 AM   #23
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so it weighs 3,820.
I thought they said last year it would be a hundred pounds less than the SS.
Hundreds less than the ZL1.
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Old 02-19-2014, 09:32 AM   #24
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no I went back and looked. they said 300 less than the ZL1 and 100 less than the SS
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Old 02-19-2014, 10:02 AM   #25
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Originally Posted by JMWNERW View Post
Why would they use smaller-diameter sways than the 1LE? What is the performance advantage?
On a race car you tune the suspension with the spring rates and the sway bars are used to fine tune. At some shorter tighter tracks (Waterford Hills in MI) some races discount the sway bars. For the street the OEM have to compromise the best of both worlds which usually means a softer springs with a larger bar (1LE)

The Z/28 is a "no compromise" track car that will be driving on the street.....so stiffer spings combined with the DSSV dampers will be doing the job and smaller sway bars can be used.

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Also, it sounds like the differential they described is like the Eaton Truetrac, with gears instead of clutch disks. Anyone have insight on how it might compare to the Truetrac?
Eaton Trutrac and JTekts Torsen diff are of the same design......Both should work the same.

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so it weighs 3,820.
I thought they said last year it would be a hundred pounds less than the SS.
That is a general marketing statement......It depends on the trim and options.

If it does weigh in at 3820 that is withing 3lbs of my 1LE with a 1/4 tank of fuel (1ss/non RS, no sunroof)

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This made me laugh, a stock SS is supposed to stop around 120 ft from 60, I would hope to God the Z/28 stops under 120 ft. It better stop under 110, .
Having driven a couple cars with Carbon Ceramic brakes on track (ZR1 / Ferrari) The inital stopping distance when cold is not the greatest result of feel from the them (relatively speaking as it best most) What is impressive is how they get better (short, better bite) when hot and then continue to be consistent lap after lap.



-Matt
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Old 02-19-2014, 11:13 AM   #26
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Originally Posted by Dropspeed View Post
On a race car you tune the suspension with the spring rates and the sway bars are used to fine tune. At some shorter tighter tracks (Waterford Hills in MI) some races discount the sway bars. For the street the OEM have to compromise the best of both worlds which usually means a softer springs with a larger bar (1LE)

The Z/28 is a "no compromise" track car that will be driving on the street.....so stiffer spings combined with the DSSV dampers will be doing the job and smaller sway bars can be used.



Eaton Trutrac and JTekts Torsen diff are of the same design......Both should work the same.



That is a general marketing statement......It depends on the trim and options.

If it does weigh in at 3820 that is withing 3lbs of my 1LE with a 1/4 tank of fuel (1ss/non RS, no sunroof)



Having driven a couple cars with Carbon Ceramic brakes on track (ZR1 / Ferrari) The inital stopping distance when cold is not the greatest result of feel from the them (relatively speaking as it best most) What is impressive is how they get better (short, better bite) when hot and then continue to be consistent lap after lap.



-Matt

To the last point, anyone not familiar with cold ceramics should be advised not to push the car with cold brakes. You will not enjoy that braking bad moment.
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Old 02-19-2014, 12:42 PM   #27
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Old 02-19-2014, 08:21 PM   #28
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Didn't Motortrend stop a 1LE from 60-0 in 101ft?



Speaking of which, I'm surprised that the Z28 is only 55lb lighter then a SS, even taking into consideration its increased mass on certain components for structural rigidity, etc.
This link claims as much, http://www.motortrend.com/roadtests/...le_first_test/

HOWEVER, I find it hard to believe a 1LE brakes from 60 in 20 ft less than its SS brother. + based on that math the Z/28 should brake under 95 ft, which I'm sorry isn't going to happen. Motortrends fastest braking car they have tested was the 2011 Corvette Z06 Carbon edition which stopped in 93 ft. That car had the same, or close to size ceramic brakes as the Z/28 will have and it weighed a good 600 lbs less. So I do not see a sub 95 ft brake from 60 mph happening.
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