|
|
SUPPORT ZPOST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS! |
Post Reply |
|
Thread Tools | Search this Thread |
08-29-2010, 04:24 PM | #89 |
Viper Driver
36
Rep 1,311
Posts |
shereef, i'm guessing ur interior refinish was done not with the aim to reduce weight, but as a matter of increased space, luxury and sound reproduction. it's a top-notch, cleanly done job and i wouldn't be concerned at all with lost stiffness/rigidity unless u're a closet track monster at heart!
|
Appreciate
0
|
08-29-2010, 04:56 PM | #90 |
instagram 997turbotom
279
Rep 7,377
Posts |
apparently a lot of people here agree with my comment
__________________
|
Appreciate
0
|
08-30-2010, 09:13 AM | #91 |
Brigadier General
851
Rep 4,057
Posts |
Hmmm. If we accept that removel of the piece doesn't affect rigidity of the car while driving, and we believe that BMW would have used some other material if the panel was not structural, it begs the question of what the panel is intended to do!
Most intriguing! In the interest of discussing ( and not to piss off anyone!) do folks think that it may have been intended to prevent the cabin from splaying apart in a rear-end collision? If its not for rigidity of the car while driving, tha's all I can think of. Cheers!
__________________
Huz-Z
BMW Z4 3.0si Roadster. Montego Blue Metallic. Premium and Sport Package. |
Appreciate
0
|
08-30-2010, 09:46 AM | #92 |
Captain
42
Rep 632
Posts |
Woah, man, first off, welcome to the forum. Second, if you haven't already, you need to post up some kind of documentary on what you've done with your car. Major work there! Definitely worth a run down of how it went, weight loss or not. That back area look great, very well finished and professional looking. How did you tie the console in - that would be my biggest question. Excellent work, all structural and weight talk aside.
__________________________________ The thought that the bulkhead was left over from the roadster is an intersting one, I'm not sure it's a legitimate one. I'd like to hear from a BMW engineer on that one. On one hand, I can see the company leaving it for the reason of not having to deal with removal and an entirely different interior design, bulk-head forward (IIRC, the coupe and roadster interiors from the bulk head forward are very similar, no?). On the other hand, I thought the coupe was structurally a different design than the roadster (can't claim to know the details though....) so if it's a different design, why wouldn't they remove the bulkhead if they could? All I know is that on the Z4MC race car that our friend had, they left the bulkhead and built the cage integral with it. I don't know why they didn't do it like in the white coupe above - seems like that might have been easier - however, we did have to deal with the oil sump being back there. The rear compartment on his Z4MC was a bit more open and accessible. And.....we know that with out all the extreme cross bracing that the cage held up in a total loss wreck...which leads me to believe that the builder of the race car believed that the bulkhead had a definite purpose in the structure of the car with a cage and in a race application. All that said, sure would be a different animal with out the bulkhead - sort of Corvette-esque being able to reach into the rear compartment from a front seat.
__________________
|=.-._.-._.-._.-._.-._.-._.-._.-._.-._.-._.-.=| Silbergrau A08 / Sepang Brown LSD6 / Carbon Leather 4MY (1 of 3, this combo) RAC RG63 | Conti EC-DW | GC/Koni-Dinan | Rogue RSM | Arqray | Autosolutions | BMW brace | Pinnacle tint Last edited by onebluemcm; 08-30-2010 at 09:57 AM.. |
Appreciate
0
|
08-30-2010, 10:04 PM | #93 | |
Second Lieutenant
16
Rep 232
Posts |
Quote:
If you really wanted to cut weight, this could easily lead to at least 100 pounds if done properly with a harness and roll bars etc. |
|
Appreciate
0
|
08-30-2010, 10:09 PM | #94 | |
Second Lieutenant
16
Rep 232
Posts |
Quote:
|
|
Appreciate
0
|
08-30-2010, 10:16 PM | #95 | |
Second Lieutenant
16
Rep 232
Posts |
Quote:
I have been meaning to keep a log of all my modifications but never really got round to it. I will have to get something going though. I'll try to take some more pictures of the car so at least you can get some idea of how things were done in terms of the console area. As I said I checked with two shops and they both said the same thing, so I believed them. But in truth, is it weaker? Possibly. It is noticeably weaker? Did it affect the performance? From what I have noticed, not in the slightest! |
|
Appreciate
0
|
09-06-2010, 01:22 AM | #96 |
I1, I won
8
Rep 97
Posts |
Sorry, but I am not sure this is accurate, so I'll just post it up. iirc the S2000 is heavier, infact I believe it to be a different GVW measurement being theoretical, not actually true. Something about assuming two occupants, a full tank of gas AND calculated weight based on cargo space. I took my 7'er to a truck scale and it was substantially less than what other people, and wiki, said the GVW would be. The plate on my door said 4700lbs, but I'll tell you what, it was a lot less than that but I am not exactly trusting scales made for vehiles over 14,000lbs of GVW.
A friend of mine that is studying to be a BMW tech out at UTI looked at his E39 M5 and I think did the same thing, he was taught the same thing, added weight based on those factors, so a trunk'd car may not be the same as a hatchback for that theoretical load. Has anyone *actually* measured or is this all spitballing trusting plates, manuals and popular opinion?
__________________
+-============[tSc]==============-+
http://www.TestShoot.com |
Appreciate
0
|
09-06-2010, 12:53 PM | #97 |
Mars Bitches... Red Rocks !
15
Rep 344
Posts
Drives: '07 Z4 M Coupe
Join Date: Nov 2008
Location: Trapped in a glass case of emotion !
|
Here's some weight savings that I've done to mine…
Cobra Suzuka seats (including custom floor mounts) = -70 lbs Morr VS8's : 8 lbs a wheel lighter ( i believe ) = -48 lbs Braille 15lb battery = -30 lbs SS Powerloop mufflers = -20 lbs Removed secondary cats / replaced with stainless tubing = -12 lbs So just this stuff equals +-180 lbs less than stock. You really notice a big difference in acceleration, especially on the freeway. I also keep my windshield washer tank empty ( living in so cal you never need it anyway / I never drive it in the rain ) and I also for the most part only fill my gas tank up half way. I still don't understand why I do that, but I do… hahahaha |
Appreciate
0
|
09-07-2010, 12:16 PM | #98 |
Lieutenant Colonel
41
Rep 1,855
Posts |
Your MORR tire weight savings calculation is a little off at -48lbs, if indeed each rim is 8 lbs lighter. 4 x 8lbs = 32 lbs lighter.
You may be counting tires as well for that total -48lbs lighter total, though, but right now it doesn't add up. Looks like you've saved a lot of weight w/o stripping the interior. Good job.
__________________
///M Coupe: RPI Scoop, OE Strut, CDV, Volk RE30, SS Brake Lines, Stromung Exhaust |
Appreciate
0
|
09-07-2010, 04:31 PM | #99 | |
Mars Bitches... Red Rocks !
15
Rep 344
Posts
Drives: '07 Z4 M Coupe
Join Date: Nov 2008
Location: Trapped in a glass case of emotion !
|
Quote:
|
|
Appreciate
0
|
09-07-2010, 07:01 PM | #100 |
I1, I won
8
Rep 97
Posts |
Pee before driving: -2lbs
Haircut: -1lbs Donate kidney: -2lbs Drive naked: -2lbs Date anorexic midget: -40lbs Fasting: -10lbs (your milage may vary) I feel light headed, but I'm fast! But in all seriousness, that is some great weight savings there man! Being in SoCal, you could of course pull the A/C and heater core. Out of all that, I would probably have kept the battery for the weight in the rear, I imagine the rear getting a bit light in sharp cornering.
__________________
+-============[tSc]==============-+
http://www.TestShoot.com |
Appreciate
0
|
11-29-2010, 10:12 PM | #101 |
Second Lieutenant
20
Rep 231
Posts |
Excellent thread. Does anyone know what a typical variance is between the advertised weight and the actual delivery weight?
My car should weigh 2,865 lbs, but is coming in at 2,884 lbs. That is only 19 lbs difference, and could be scale error, a heavier than expected car, or both. I was just wondering what a normal difference might be between delivery and advertised-- especially since my measurement was on a nearly empty tank and the consensus here is that BMW does "wet" weights. The 2004 Z4 3.0i is supposed to weigh 3,009 lbs. Mine came with the sport/premium packages. I weighed mine with a nearly empty tank and after losing weight from the following changes: Battery -32 Wheels -41 Springs -6 Seats - 70 Camber plates +5 Theoretical = 2,865 Actual = 2,884 Thanks
__________________
FS: Leather Recaro Pole Position Seats & Hardware Last edited by nlink720; 11-29-2010 at 10:39 PM.. |
Appreciate
0
|
11-30-2010, 11:48 AM | #102 |
Midlife Crises Racing Silent but Deadly Class
1821
Rep 5,337
Posts
Drives: 2006 MZ4C, 2021 Tesla Model 3
Join Date: Oct 2007
Location: Welcome to Jamaica have a nice day
|
Porsche weights are dry.
__________________
Sitting on a beat-up office chair in front of a 5 year old computer in a basement floor, sipping on stale coffee watching a bunch of meaningless numbers scrolling aimlessly on a dimly lit 19” monitor.
|
Appreciate
0
|
12-23-2010, 01:47 AM | #103 |
///M-fanatic
193
Rep 3,885
Posts |
After exhaust mufflers, coilovers, wheels, driver bucket seat, and taking out some of the tools above the battery, my car weighed in @ 3180 lbs. with 1/4 tank of gas.
I also did a full tank weighing with the above setup, and it came in @ 3260 lbs. Since then, I've gotten a different set of wheels/tires, and have swapped out the stock headers. I will report back with my weight findings, since I have a weigh station nearby Last edited by mfanatic325; 12-27-2010 at 06:04 PM.. |
Appreciate
0
|
02-04-2011, 12:38 AM | #106 |
///M-fanatic
193
Rep 3,885
Posts |
I only swapped out the driver's seat. Left the passenger seat alone, since I didn't want to deal with the airbag stuff. Plus, I only had one bucket seat available from my MR2
The OEM heated and powered seat weighs in at almost 60 lbs. And typical bucket seats weigh in at around 15 lbs. excluding mounting hardware, etc. so a full seat with hardware is probably around 20 lbs. total give or take. That means a weight savings per seat of about 40 lbs. or so. |
Appreciate
0
|
02-04-2011, 09:43 AM | #109 |
Lieutenant Colonel
41
Rep 1,855
Posts |
Argh. With a full tank of gas, yours is still in the 3200's. Mine is pretty much stock, and it must weigh 3300+ with a tank of gas. Sad face.
__________________
///M Coupe: RPI Scoop, OE Strut, CDV, Volk RE30, SS Brake Lines, Stromung Exhaust |
Appreciate
0
|
02-04-2011, 10:00 AM | #110 |
Lieutenant
51
Rep 576
Posts
Drives: Interlagos Z4 M Coupe
Join Date: Jun 2010
Location: In a van, down by the river.
|
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|