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Looking at this thread one would conclude Z06 weighs very low 3400 lbs (around 3410) with very little fuel.
As per GM, weight differential between Z06 and ZR1 is only 36 lbs (3524 vs 3560) for curb weight.
That would put ZR1 to be 3450 lbs with same amount of fuel. Which is clearly not the case as we are getting magazine weights of 3680 lbs with full tank of gas and we know gas doesnt weigh 200 lbs.
so what is the explanation? How much does a m7 zr1 weigh with less than 1/4 tank of gas maybe just reserve?
The mag weight of 3679 3lz to 3660 1lz
My stock A8 1lz just weighed 3500 who knows the state scales read off., but I have a 4 corner scale coming so I can get the real story on my cars.
About 160 difference but the extra weight is on the front. All weights should be full of fuel. 1/4 tank stuff is not correct.
Last edited by Steve Garrett; 07-21-2018 at 05:38 PM.
You're comparing manufacturer claims to magazine figures.
I am not comparing them directly. I am comparing the DELTA figures which must be constant relative to each other. Think for a second and you ll see what I mean.
Bottom line is GM says ZR1 is 36 lbs heavier than Z06 for a M7 car. Yet that seems highly impossible when we look at the real world weights. It looks like a ZR1 with very little tank of gas will be around 3570 lbs or so at best which means the difference is over 150 lbs not 36.
I had my 2015 M7 3LZ Z06 weighed at a PCA club race event and it was 3559 with a full tank of fuel, stock wheels and tires, and AP Racing brakes. As I recall the 1LZ to 3LZ delta was only ~35 lbs on the Z06. I'm trying to borrow a set of proper scales to weigh my ZR1 and will report back. The difference between a full and totally empty fuel load is 111 lbs (18.5 X 6).
I had my 2015 M7 3LZ Z06 weighed at a PCA club race event and it was 3559 with a full tank of fuel, stock wheels and tires, and AP Racing brakes. As I recall the 1LZ to 3LZ delta was only ~35 lbs on the Z06. I'm trying to borrow a set of proper scales to weigh my ZR1 and will report back. The difference between a full and totally empty fuel load is 111 lbs (18.5 X 6).
Here is my buddy's totally stock 2015 M7 1LZ Z06 full of fuel weighed with my scales: 3560 lbs
and for reference here is my totally stock 2014 M7 1LT Z51 weighed full of fuel: 3410 lbs. So a delta of 150 lbs between an M7 Z51 and an M7 Z06 both with the base packages
I think one of the contributing factors, is when giving the 'weight difference' between the Z06 and the ZR1... is they're comparing 1LZ base trim cars. Which that is fairly apples to apples. However, the Z06 comes standard with Iron rotors, whereas the ZR1 comes standard with Ceramic rotors. Which is probably 35 more pounds that you could add/subtract depending on which car.
I think one of the contributing factors, is when giving the 'weight difference' between the Z06 and the ZR1... is they're comparing 1LZ base trim cars. Which that is fairly apples to apples. However, the Z06 comes standard with Iron rotors, whereas the ZR1 comes standard with Ceramic rotors. Which is probably 35 more pounds that you could add/subtract depending on which car.
Best Regards,
Dave
Good point. I am running the AP Racing kit and when Essex weighted out all the parts it was essentially same weight as the CCBs if you total all four corners. So in effect the extra weight my 3LZ car gained over a 1LZ was mitigated by the brake swap. I'll take that.
Also, Mike Levitas made a good point today about scales. Most scales only have a sensor in the middle and depending on where the wheels are situated on the scale it can skew the results. The ones he keeps in the transporter have 4 sensors in each pad.
Here is my buddy's totally stock 2015 M7 1LZ Z06 full of fuel weighed with my scales: 3560 lbs
and for reference here is my totally stock 2014 M7 1LT Z51 weighed full of fuel: 3410 lbs. So a delta of 150 lbs between an M7 Z51 and an M7 Z06 both with the base packages
Very good friends of mine own Intercomp. Great scales
Weighed my 720S at Atco with 1/4 tank of gas and it weighed 3,050 lbs.
edit - completely misread the thread title and thought we were comparing the 720S. sorry, guys
- NP, still interesting to know. Especially since so many here compare the 720 and ZR1 for some reason. My Z4 M Coupe weighed 3240 stock, in case anyone cares...which no one should.
Before the C7 was even introduced I was lobbying for a track special that placed a high emphasis on deleting equipment and sound insulation for those who emphasize performance
over luxury and cruising, and I was savaged because this would "devalue" the brand. Now here we are talking weights and wondering why a 3,100 pound car is faster than a 3,600 pound car with the same power. Obviously, McLaren doesn't care about devaluing its' brand.
So who is going to be first to post pics of a racing scale readout of a ZR1 full of fuel so we can compare the actual curb weight to the other models of the C7? I have great confidence on my set of Intercomp scales. I level all my scales to better than 1/16" and my readings on multiple cars are always very close to weights published by various magazines. Tires are always centered over the sensor region too which is easy to do if you have the car on a 2 post lift to move it up and down over the scales..
So who is going to be first to post pics of a racing scale readout of a ZR1 full of fuel so we can compare the actual curb weight to the other models of the C7? I have great confidence on my set of Intercomp scales. I level all my scales to better than 1/16" and my readings on multiple cars are always very close to weights published by various magazines. Tires are always centered over the sensor region too which is easy to do if you have the car on a 2 post lift to move it up and down over the scales..
I'll do it if I can get a set of scales. I put a message out for folks coming to the last track event to see if anyone would bring a set but no luck. I've toyed with it but I'm just not willing to drop a grand for scales that I would only use for this one thing.
3700 on the dot for my M7 ZR1 weighed at Houston Raceway Park. Their scale was a tractor/trailer style, in ground scale so I was not able to get corner weights. I did have a backpack and some random stuff in the car. Not more than 20lbs though
3700 on the dot for my M7 ZR1 weighed at Houston Raceway Park. Their scale was a tractor/trailer style, in ground scale so I was not able to get corner weights. I did have a backpack and some random stuff in the car. Not more than 20lbs though
LOL so what? It pulls like a freight train and will out run anything on the freeway. A couple hundred pounds is nothing in exchange for all the comfort and technology this car has that the low weight cars lack. I’d still buy it if it was heavier!
Now put your mustang on the scale and let’s all talk about how heavy and under powered it is!
07-18-2018, 06:33 PM
Z06 vs ZR1 Weight Discrepancy
