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06-09-2014, 01:33 PM
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#1 |
 
Drives: 2013 ZL1 Join Date: Jun 2013
Location: Austin
Posts: 124
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Effect of weight on performance?
I was wondering if anybody had any real objective data on the performance of the ZL1 relative to weight.
I realize there are MANY variables including weather, mods, fuel, etc. But...has anybody actually seen any real data on increases in 1/4 mile times by removing 50/100/200? pounds. I'm the heaviest thing that could be removed from my car 
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06-09-2014, 01:36 PM
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#2 |
Drives: Widebody 2013 Mustang GT Join Date: Feb 2012
Location: 1721 E. Lambert Rd. Unit C, La Habra, Ca 90631
Posts: 2,845
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You can find lots of 1/4 mile calculators to get a rough idea, but I'm not sure how accurate most of them are. Weight makes a huge difference for road racing and drag racing as well, hopefully someone can post up some time slips before and after a weight loss, but that might be hard to find without the times being skewed by additional power mods.
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06-09-2014, 02:48 PM
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#3 |
         
Drives: 20 X3M CP & 19 ZL1 1LE A10 Join Date: Jun 2013
Location: Brenham, TX
Posts: 3,517
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Weight is the enemy.
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🔺22 RS E TRON GT
🔺21 Model S Plaid |
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06-09-2014, 02:59 PM
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#4 |
 
Drives: '15 SS 1LE, '69 Z28 drag car Join Date: Dec 2009
Location: Mich
Posts: 4,482
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Did a weight loss back to back comparison a few weeks ago. A 55 lb reduction was good for about a .15 improvement. Swapped two lead acid batteries for one lithium battery in a high 8 sec 1st gen car. Less weight in the back hurt the 60 ft .01/.02ish, possibly had slight tire slip. With a little more chassis tuning might be able to slightly improve on the weight loss et improvement.
Traction, and weather often seem to really impact the ET the most. Below 50 F, with traction, and the ET really drops a couple tenths. All else being equal, I'd guess 100 lbs being good for about 2 tenths. Lots of variables though. |
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06-09-2014, 03:11 PM
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#5 |
Drives: '21 ZLE A10 Join Date: May 2012
Location: Mechanicsville, VA
Posts: 6,824
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general old school weight difference seems to be .1 sec for every 100 pounds. Anyone ever read the old Hot Rod article "Caddy Hack"?
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'21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60'
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold) |
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06-09-2014, 04:15 PM
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#6 | |
Drives: 2013 ZL1 Convertible Join Date: Oct 2013
Location: Valrico, FL
Posts: 516
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Quote:
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2013 ZL1 Auto Convertible - BRM
Best: 10.829@127.15 FI Interchiller, Roto-Fab CAI, Big Gulp & Res, 9.1/2.5 Pulleys, PB&S, DeatschWerks 1500cc, Fore triple pump, Pfadt LT's, RD HX, MT DR's New times to come with E85 2016 2SS Auto - Hyper Blue Metallic Roto-Fab CAI |
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06-09-2014, 04:25 PM
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#7 |
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Speed Freak
Drives: 2013 ZL1 Camaro, 2016 Camaro SS Join Date: Jun 2013
Location: Ardmore, OK
Posts: 2,637
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I frequently let a passenger ride with me on the 1/4 mile and they are always good for 2/10 second extra on the clock.
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2016 SS -AGP twin Borg Warner 7163 EFR's, LT4 mechanical pump, LT4 injectors, Walbro 255 low side, Castrol SRF. 734whp/759 tq
2013 ZL1 -ADM - 427 LSX 6 bolt, O-ringed block built by LME. Twin PT6466 turbos. RPM custom manual trans, RPS Quad carbon clutch, 9" Hendrix rear diff & axles. ADM/squash fuel system, Ron Davis radiator, Spal fans, AGP air to air, turbo plumbing. LPE oil cooler, rear bushing upgrade, roll bar...etc. rwhp 1400+... 212.5mph, best Texas mile to date.  |
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06-09-2014, 04:47 PM
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#8 | |
 
Drives: 2023 Silverado LTZ, 2022 Camaro 2SS Join Date: Jul 2010
Location: Arkansas
Posts: 322
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Quote:
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06-09-2014, 05:02 PM
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#9 |
Drives: 2010 Camaro 2SS/RS Join Date: Mar 2008
Location: S.W. Florida
Posts: 6,294
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Lots of guys race with a passenger in their car. Most don't realize that the passenger is worth about .2 or so in the 1/4 mile (-20hp).
Especially guys street racing. One person will ride along to film the race. The car with the passenger filming is at about a 2 car length disadvantage in a full length race. Also, the lighter your car the more a reduction or increase in weight will affects it (higher % of its overall weight) A lighter car (WRX for example), will be more affected by an increase of 100 lbs than a 4200 lb car. |
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06-09-2014, 07:29 PM
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#10 | |
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Drives: '21 ZLE A10 Join Date: May 2012
Location: Mechanicsville, VA
Posts: 6,824
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Quote:
__________________
'21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60'
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold) |
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06-09-2014, 09:17 PM
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#11 |
Drives: 2012 ZL1 Join Date: Dec 2011
Location: pittsburgh area
Posts: 1,426
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I rode with my uncle a couple times in his car. It was an automatic mercedes so very very consistent 12.9's with just driver and very consistant 13.1 with passenger. That 100# = 1/10 is fairly accurate. Where the weight comes off is also very important. Static weight, sprung and unsprung, and rotational weight will offer different gains.
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2012 CTF ZL1-stock
2012 ZL1 (sold) JRE 75rwhp kit catless ported lsa TB 11.04 @ 128.35 on hoosier drs and skinnies @ PRP with 1100DA |
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06-10-2014, 06:02 PM
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#12 | |
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Drives: 2013 ZL1 Convertible Join Date: Oct 2013
Location: Valrico, FL
Posts: 516
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Quote:
__________________
2013 ZL1 Auto Convertible - BRM
Best: 10.829@127.15 FI Interchiller, Roto-Fab CAI, Big Gulp & Res, 9.1/2.5 Pulleys, PB&S, DeatschWerks 1500cc, Fore triple pump, Pfadt LT's, RD HX, MT DR's New times to come with E85 2016 2SS Auto - Hyper Blue Metallic Roto-Fab CAI |
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