M coupe on a diet

crfine88 · 05-21-2011, 06:46 PM

The table of contents will be updated as items are added to the thread

Table of Contents
Post #1 Nav/Stereo delete
Post #16 OEM Battery & accessories
Post #26 Bulkhead Delete
Post #58 "Light weight" battery and bracket

Name: nav1.jpg
Views: 1602
Size: 340.8 KB

Name: nav1.jpg
Views: 1602
Size: 340.8 KB

Just finished removing the complete navigation/stereo system.
There were a lot of questions and speculations about weight, so here is the break down.

04.8 lbs-Harness
01.0 lbs-misc brackets
04.2 lbs-2 Kick panel Speakers
14.2 lbs-2 Rear subwoofers
00.2 lbs-GPS antenna
09.0 lbs-Amps/amp brackets
03.4 lbs-4 mid range speakers
00.2 lbs-2 tweeters
03.6 lbs-GPS/DVD drive
02.4 lbs-Pop-up display
02.6 lbs-Head unit

45.6 lbs total

Samjam927 · 05-21-2011, 06:54 PM

interesting, why take it out for such minimal weight loss?

Finnegan · 05-21-2011, 07:47 PM

~46 lbs.

So racing type seats; 80lbs for both?

Braille battery, 30 lbs?

Aftermarket exhaust, 40 lbs?

A/C 50 lbs?

So, maybe possible to get under 3,000 lbs?

pal · 05-21-2011, 08:35 PM

That's a decent loss - thanks for the great data. Do you have pictures of the process and the aftermath? I want to keep it all there but see if there is space around the subwoofer for a custom rollbar.

biped · 05-21-2011, 09:17 PM

Quote:

Originally Posted by Samjam927

interesting, why take it out for such minimal weight loss?

Because all the minimal things add up. You are using the wrong criteria.

You should be asking :

Is it bolted down ? Will the car still run with out ? yes/yes... good pull it.

-c- · 05-21-2011, 11:35 PM

Looks like the original guess on weight was right on ...kick but.

onebluemcm · 05-22-2011, 06:36 AM

Quote:

Originally Posted by Finnegan

~46 lbs.

So racing type seats; 80lbs for both?

Braille battery, 30 lbs?

Aftermarket exhaust, 40 lbs?

A/C 50 lbs?

So, maybe possible to get under 3,000 lbs?

The Z4M Grand Am car my friend had in 2008 weighed 2900 lbs and that was with anywhere from 50-100 lbs added to it to keep it 2900 - sanctioning body requirement. That was obviously with a roll cage, fire suppression system, dry sump oil system, and cool suit stuff. IF you really want to gut one, lightness is definitely achievable.

Hairballs58 · 05-22-2011, 09:35 AM

I'm curious how your interior looks like now too.

Finnegan · 05-22-2011, 01:18 PM

Quote:

Originally Posted by onebluemcm

The Z4M Grand Am car my friend had in 2008 weighed 2900 lbs and that was with anywhere from 50-100 lbs added to it to keep it 2900 - sanctioning body requirement. That was obviously with a roll cage, fire suppression system, dry sump oil system, and cool suit stuff. IF you really want to gut one, lightness is definitely achievable.

Not looking to really gut one; but a couple hundred pounds is about the same as adding 20 HP. Add braking and handling and even MPG benefit.

ZStig · 05-22-2011, 03:14 PM

I'd rip the system out too, if I didn't enjoy the music so much!

wrose · 05-22-2011, 04:32 PM

Now you have a great location for a gauge pod -where nav. screen was
-Can watch the boost rise as well as feel it .
-I'm trying to figure our where to mount a boost gague -mounted the ft.splitter yesterday but waiting for my S/C to arrive and install before putting the bumper back on9hopefully next weekend.
_ great updates on your ongoing project
Wayne

onelove · 05-22-2011, 07:09 PM

Did you add anything back in afterwards (IE headunit or speakers?)

I'm about to put my old girl on a diet once I decide to cut her up for a roll bar, it's amazing how much difference weight makes yet many often overlook it. I've always been one to gut my cars in areas where people least expect it (IE shave foam off the underside of carpet, undercoating removing on the interior, lighter seats, etc).

bhoch · 05-23-2011, 06:44 AM

conversation with wife:

Me: Shame we are not closer to Cave Creek, AZ.
Her: Why?
Me: I could swap out my dash and get the built in NAV installed from someone there from the forum. Cost would be well worth it.
Her: Thankfully we are not closer to Cave Creek AZ.

crfine88 · 05-23-2011, 07:44 AM

Quote:

Originally Posted by Samjam927

interesting, why take it out for such minimal weight loss?

I can see what you mean, but 46 pound is significant in my book and the dieting is not finished yet

Quote:

Originally Posted by Finnegan

~46 lbs.

So racing type seats; 80lbs for both?

Braille battery, 30 lbs?

Aftermarket exhaust, 40 lbs?

A/C 50 lbs?

So, maybe possible to get under 3,000 lbs?

That is goal. I'm not ready to part with the A/C yet. That will be the last to go. I will try to make up for that weight in other areas.

Quote:

Originally Posted by pal

That's a decent loss - thanks for the great data. Do you have pictures of the process and the aftermath? I want to keep it all there but see if there is space around the subwoofer for a custom rollbar.

I will post photos up soon. There is a ton of wasted space under the platic sills below the small rear windows. There is a flat spot there that would be good for mounting a cage, but access for welding would be tight. Might work for bolt in though.

Quote:

Originally Posted by biped

Because all the minimal things add up. You are using the wrong criteria.

You should be asking :

Is it bolted down ? Will the car still run with out ? yes/yes... good pull it.

Yes, I agree

Quote:

Originally Posted by -c-

Looks like the original guess on weight was right on ...kick but.

nailed it

(although I did give myself a 10-15lb +/-

)

Quote:

Originally Posted by onebluemcm

The Z4M Grand Am car my friend had in 2008 weighed 2900 lbs and that was with anywhere from 50-100 lbs added to it to keep it 2900 - sanctioning body requirement. That was obviously with a roll cage, fire suppression system, dry sump oil system, and cool suit stuff. IF you really want to gut one, lightness is definitely achievable.

Quote:

Originally Posted by Hairballs58

I'm curious how your interior looks like now too.

Good to know we can get them that low. I am going to see how close I can get without fully gutting the car out.

Quote:

Originally Posted by Finnegan

Not looking to really gut one; but a couple hundred pounds is about the same as adding 20 HP. Add braking and handling and even MPG benefit.

I am going to try and keep some sort of balance between dropping the lbs and keeping a stock look from the cage forward. I hope to drop a few hundred pounds and still keep the interior looking good (fingers crossed)

Quote:

Originally Posted by Roffle Waffle

I'd rip the system out too, if I didn't enjoy the music so much!

Can't hear the music over the RPI's

I think I used to like how it sounded, just can't remember

Quote:

Originally Posted by wrose

Now you have a great location for a gauge pod -where nav. screen was
-Can watch the boost rise as well as feel it .
-I'm trying to figure our where to mount a boost gague -mounted the ft.splitter yesterday but waiting for my S/C to arrive and install before putting the bumper back on9hopefully next weekend.
_ great updates on your ongoing project
Wayne

Thanks Wayne
The gauge pod location in the dash has crossed my mind.

Quote:

Originally Posted by onelove

Did you add anything back in afterwards (IE headunit or speakers?)

I'm about to put my old girl on a diet once I decide to cut her up for a roll bar, it's amazing how much difference weight makes yet many often overlook it. I've always been one to gut my cars in areas where people least expect it (IE shave foam off the underside of carpet, undercoating removing on the interior, lighter seats, etc).

Nothing went back in, but I am thinking about a future project with a removable stereo system in the back section. The only weight that would be added to the front would be tweeters and kick panel spekers. The head unit, sub, amp and aux batt would all be a part of a removable "boombox" of sorts.

Quote:

Originally Posted by bhoch

conversation with wife:

Me: Shame we are not closer to Cave Creek, AZ.
Her: Why?
Me: I could swap out my dash and get the built in NAV installed from someone there from the forum. Cost would be well worth it.
Her: Thankfully we are not closer to Cave Creek AZ.

I have had many of these conversations with my wife

inTgr8r · 05-23-2011, 07:58 AM

subscribed.

the only music I ever listen to in the coupe is the S54

crfine88 · 05-23-2011, 08:00 AM

-45.2 lbs Batt.
-06.4 lbs acc's on top of batt.
-03.6 lbs batt bracket

-55.2 total

+15.0 rplc batt + custom bracket

40.2 total weight saved

007MCoupe · 05-23-2011, 09:30 AM

Getting ready for beach season?? lol

Good to know how much weight could be lost with such a simple stereo delete. (since I don't have nav to begin with)

Agreed A/C should be last thing to go, until it's dedicated...especially in AZ.

ZStig · 05-23-2011, 02:01 PM

I like that scale. Gonna have to pick one up later on amazon

Finnegan · 05-23-2011, 02:34 PM

Subscribed.

I'm guessing you're going to need to keep that lightweight battery on the charger when off the road though!

This is an interesting thread and I'm hoping I can get some ideas for long-term diet projects w/o too much loss in functionality (A/C is a tough delete in AZ for example).

a_riddler · 05-23-2011, 03:56 PM

Headlight washer system can go also. The pump to the headlights is at the low point in the reservoir though so you can't pull that unless you find a plug. I was hoping to find a reservoir from non-m model but it looks like they also have the headlight washer.

crfine88 · 05-23-2011, 04:24 PM

Quote:

Originally Posted by inTgr8r

subscribed.

the only music I ever listen to in the coupe is the S54

Quote:

Originally Posted by 007MCoupe

Getting ready for beach season?? lol

Good to know how much weight could be lost with such a simple stereo delete. (since I don't have nav to begin with)

Agreed A/C should be last thing to go, until it's dedicated...especially in AZ.

yep

Quote:

Originally Posted by Roffle Waffle

I like that scale. Gonna have to pick one up later on amazon

Had it for a few years now and it has always been very accurate up to 150lbs

Quote:

Originally Posted by Finnegan

Subscribed.

I'm guessing you're going to need to keep that lightweight battery on the charger when off the road though!

This is an interesting thread and I'm hoping I can get some ideas for long-term diet projects w/o too much loss in functionality (A/C is a tough delete in AZ for example).

Ended up going with a 20lb option for more reliability since we do still take the car on road trips.

Quote:

Originally Posted by a_riddler

Headlight washer system can go also. The pump to the headlights is at the low point in the reservoir though so you can't pull that unless you find a plug. I was hoping to find a reservoir from non-m model but it looks like they also have the headlight washer.

Good call. I removed this during the Splitter install

imom · 05-23-2011, 07:41 PM

Wow Crfine...how come you haven't pulled the trigger yet and just get carbon fiber body parts. Forget this diet business and go for the serious lippo suction and stomach stapling. Your car will be the monster of a 2600+ lb car with 450HP or more...sorry I didn't follow up on your modification journal, but giving modest numbers...you're probably over 500+ HP now - 1/4 HP for the headers.

I wonder with all of your mods if you're under 3000lbs yet? Very impressive if it already is.

OH BTW, losing AC in AZ is insane especially in the summer...that's really dedication for a car...but to each their own.

05-21-2011, 06:46 PM	#1
crfine88 Colonel 442 Rep 2,747 Posts Drives: E86M Join Date: Jan 2009 Location: Cave Creek AZ. iTrader: (19)	M coupe on a diet The table of contents will be updated as items are added to the thread Table of Contents Post #1 Nav/Stereo delete Post #16 OEM Battery & accessories Post #26 Bulkhead Delete Post #58 "Light weight" battery and bracket Just finished removing the complete navigation/stereo system. There were a lot of questions and speculations about weight, so here is the break down. 04.8 lbs-Harness 01.0 lbs-misc brackets 04.2 lbs-2 Kick panel Speakers 14.2 lbs-2 Rear subwoofers 00.2 lbs-GPS antenna 09.0 lbs-Amps/amp brackets 03.4 lbs-4 mid range speakers 00.2 lbs-2 tweeters 03.6 lbs-GPS/DVD drive 02.4 lbs-Pop-up display 02.6 lbs-Head unit 45.6 lbs total __________________ LINK TO 07 IR PHOTO JOURNAL:http://www.zpost.com/forums/showthread.php?t=1303735 LINK TO 06 IB MOD JOURNAL:http://www.zpost.com/forums/showthread.php?t=403119 Last edited by crfine88; 05-31-2011 at 05:29 PM..
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05-21-2011, 06:54 PM	#2
Samjam927 The One And Only 15 Rep 398 Posts Drives: 2006 TiAg ///M Roadster Join Date: Jun 2007 Location: Deerfield, Illinois iTrader: (0) Garage List 2006 Z4M Roadster [10.00] 2003 Z4 [5.00]	interesting, why take it out for such minimal weight loss? __________________ By Samjam927
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05-21-2011, 07:47 PM	#3
Finnegan Dog Listener 703 Rep 7,850 Posts Drives: Z4M/. Z3M, E36/46 M3 Join Date: Oct 2008 Location: Teaching the dog to slalom iTrader: (22)	~46 lbs. So racing type seats; 80lbs for both? Braille battery, 30 lbs? Aftermarket exhaust, 40 lbs? A/C 50 lbs? So, maybe possible to get under 3,000 lbs?
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05-21-2011, 08:35 PM	#4
pal Captain 433 Rep 753 Posts Drives: Z4 M Coupe Join Date: Nov 2007 Location: Seattle, WA iTrader: (2)	That's a decent loss - thanks for the great data. Do you have pictures of the process and the aftermath? I want to keep it all there but see if there is space around the subwoofer for a custom rollbar.
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05-21-2011, 11:35 PM	#6
-c- Colonel 888 Rep 2,736 Posts Drives: bmw Join Date: May 2010 Location: Chicago iTrader: (5)	Looks like the original guess on weight was right on ...kick but.
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05-22-2011, 09:35 AM	#8
Hairballs58 Needs FI 6 Rep 73 Posts Drives: '06 Z4MR Join Date: Jul 2010 Location: So Cal iTrader: (0)	I'm curious how your interior looks like now too.
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05-22-2011, 03:14 PM	#10
ZStig instagram 997turbotom 279 Rep 7,377 Posts Drives: Interlagos Z4MR Join Date: Jun 2008 Location: Delray Beach, FL iTrader: (4)	I'd rip the system out too, if I didn't enjoy the music so much! __________________
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05-22-2011, 04:32 PM	#11
wrose Private 13 Rep 91 Posts Drives: 2007 Z4MC Join Date: Oct 2009 Location: NS,Canada iTrader: (1) Garage List 2006 Z4M Roadster [8.50] 2007 Z4MC [0.00] 2005 X3 [0.00]	Now you have a great location for a gauge pod -where nav. screen was -Can watch the boost rise as well as feel it . -I'm trying to figure our where to mount a boost gague -mounted the ft.splitter yesterday but waiting for my S/C to arrive and install before putting the bumper back on9hopefully next weekend. _ great updates on your ongoing project Wayne
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05-22-2011, 07:09 PM	#12
onelove Track Head 24 Rep 503 Posts Drives: 07 Z4M Join Date: Jan 2008 Location: Orlando,FL iTrader: (0)	Did you add anything back in afterwards (IE headunit or speakers?) I'm about to put my old girl on a diet once I decide to cut her up for a roll bar, it's amazing how much difference weight makes yet many often overlook it. I've always been one to gut my cars in areas where people least expect it (IE shave foam off the underside of carpet, undercoating removing on the interior, lighter seats, etc). __________________ 2004 Porsche GT3 \|White HRE R40 Monoblocks \| KW Clubsport Suspension \| RSS Lower Control Arms and Suspension Links \| GT3RS Wing and Front Bumper \| Cup Car Lip \| Euro GT3 Seat \| GMG Half Cage \| Europipe Exhaust \| EPL Tuning
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05-23-2011, 06:44 AM	#13
bhoch SSGT USMC - '78 - '86 13 Rep 487 Posts Drives: Z4 3.0si Join Date: Jul 2010 Location: Liberty Hill, Tx iTrader: (0) Garage List 2007 BMW Z4 [7.33]	conversation with wife: Me: Shame we are not closer to Cave Creek, AZ. Her: Why? Me: I could swap out my dash and get the built in NAV installed from someone there from the forum. Cost would be well worth it. Her: Thankfully we are not closer to Cave Creek AZ. __________________ Thanks, Bill 2007 3.0si Roadster Black/Red, sport, Piano Black F14 Forgestar's
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05-23-2011, 07:58 AM	#15
inTgr8r Lieutenant General 2432 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	subscribed. the only music I ever listen to in the coupe is the S54 __________________ '21 M2C Hockenheim Silver '18 718 Cayman S Lava Orange (sold) '13 E92 M3 Santorini Blue (sold) '07 Z4 M Coupe Alpine White (sold)
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05-23-2011, 08:00 AM	#16
crfine88 Colonel 442 Rep 2,747 Posts Drives: E86M Join Date: Jan 2009 Location: Cave Creek AZ. iTrader: (19)	More Dieting -45.2 lbs Batt. -06.4 lbs acc's on top of batt. -03.6 lbs batt bracket -55.2 total +15.0 rplc batt + custom bracket 40.2 total weight saved Attached Images __________________ LINK TO 07 IR PHOTO JOURNAL:http://www.zpost.com/forums/showthread.php?t=1303735 LINK TO 06 IB MOD JOURNAL:http://www.zpost.com/forums/showthread.php?t=403119
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05-23-2011, 09:30 AM	#17
007MCoupe Lieutenant Colonel 94 Rep 1,546 Posts Drives: '18 Sakhir M3 ZCP Join Date: Jun 2010 Location: ( ///// ) iTrader: (5)	Getting ready for beach season?? lol Good to know how much weight could be lost with such a simple stereo delete. (since I don't have nav to begin with) Agreed A/C should be last thing to go, until it's dedicated...especially in AZ. __________________ Become a ///Member!
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05-23-2011, 02:01 PM	#18
ZStig instagram 997turbotom 279 Rep 7,377 Posts Drives: Interlagos Z4MR Join Date: Jun 2008 Location: Delray Beach, FL iTrader: (4)	I like that scale. Gonna have to pick one up later on amazon __________________
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05-23-2011, 02:34 PM	#19
Finnegan Dog Listener 703 Rep 7,850 Posts Drives: Z4M/. Z3M, E36/46 M3 Join Date: Oct 2008 Location: Teaching the dog to slalom iTrader: (22)	Subscribed. I'm guessing you're going to need to keep that lightweight battery on the charger when off the road though! This is an interesting thread and I'm hoping I can get some ideas for long-term diet projects w/o too much loss in functionality (A/C is a tough delete in AZ for example).
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05-23-2011, 03:56 PM	#20
a_riddler Bimmer Noob 30 Rep 566 Posts Drives: 08 Z4MC;08 MBZ E350 4Matic Join Date: May 2010 Location: Seattle, WA iTrader: (6)	Headlight washer system can go also. The pump to the headlights is at the low point in the reservoir though so you can't pull that unless you find a plug. I was hoping to find a reservoir from non-m model but it looks like they also have the headlight washer. __________________ 08 Z4MC /// DKF Exhaust, Stoptech 6/4 BBK, TCK Coilovers, Strong-Strut, Apex EC-7's, APR Splitter/Wing, AFE Intake, Underdrive pulleys, AS SSK, Jaffster, UUC Tranny Mounts, Matte Grill, RPI Scoop, CF Badges
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05-23-2011, 07:41 PM	#22
imom First Lieutenant 29 Rep 313 Posts Drives: Subaru BRZ ....... Z4MR (SOLD) Join Date: Oct 2009 Location: Los Angeles iTrader: (3)	Wow Crfine...how come you haven't pulled the trigger yet and just get carbon fiber body parts. Forget this diet business and go for the serious lippo suction and stomach stapling. Your car will be the monster of a 2600+ lb car with 450HP or more...sorry I didn't follow up on your modification journal, but giving modest numbers...you're probably over 500+ HP now - 1/4 HP for the headers. I wonder with all of your mods if you're under 3000lbs yet? Very impressive if it already is. OH BTW, losing AC in AZ is insane especially in the summer...that's really dedication for a car...but to each their own.
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