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Sunroof Weight

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Old 05-25-2014, 11:57 AM   #1
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Default Sunroof Weight

On a different thread it was mentioned that there is a noticeable improvement in acceleration and handling on non sunroof equipped SQ5's because it reduces overall weight of the vehicle more than 100 pounds. It's easy to understand why 100 pounds would make a difference, but I would have guessed that a sunroof would add less than half that amount of weight. I understand that it's much more than just the sunroof (also the frame, motor, and perhaps extra roof bracing) but does it really increase the weight that much? Thanks.
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Old 05-25-2014, 01:05 PM   #2
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Default Yes, all those reasons, plus

the glass itself is a good amount heavier than the sheet metal area it displaces. It also raises the center of gravity at the same time, and at the area highest up/with the most effect to start with. Little stuff like the blind for it, the pop up air deflector, the drain system tubing, etc. also add to the incremental total weight.
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Old 05-25-2014, 01:22 PM   #3
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Believe it or not a complete system sunroof has the weight 104 kg
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Old 05-25-2014, 02:19 PM   #4
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Wow! That's more than 200 lbs! I'm trying to imagine how many technicians it takes to lift a new one in when in the event a replacement is needed.
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Old 05-25-2014, 02:22 PM   #5
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Quote:
Originally Posted by shark115 View Post
On a different thread it was mentioned that there is a noticeable improvement in acceleration and handling on non sunroof equipped SQ5's because it reduces overall weight of the vehicle more than 100 pounds. It's easy to understand why 100 pounds would make a difference, but I would have guessed that a sunroof would add less than half that amount of weight. I understand that it's much more than just the sunroof (also the frame, motor, and perhaps extra roof bracing) but does it really increase the weight that much? Thanks.
That was me. I knew that the weight of a standard-sized sunroof is around 40 pounds. However, until seeing spijun's spec above, I was just guessing that the panoramic one was at least 100 pounds. At nearly 230 pounds, I was way off! Thanks spijun! That is substantial!

Now, I'm guessing the weight of the metal that it replaces to be around 30 pounds, so let's talk about those 200 extra pounds...they are on the roof! For a simple demonstration, strap 200 pounds to the roof of any regular-sized vehicle and see if you notice it. I do have a couple of minor complaints about my (still new) SQ5, but the panoramic sunroof deletion isn't one of them. After driving both, I am thrilled that I waited the extra time to get one without. It's not so much the acceleration (although it is most likely the reason for my bone-stock, 0-60 time of 5.0 sec.), but the handling is noticeably, greatly improved. Aesthetically...I'm kind of a cave-dweller, so I really like the darker and cooler interior.

spijun: I'm starting a new thread that I would like your technical input on, regarding the noticeable negative camber at the rear wheels.
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Old 05-25-2014, 04:23 PM   #6
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That sounds about right. On an RS4 the difference with/without sunroof is about 70 pounds, and that sunroof is what - about 1/4 the size? I ordered my RS4 without sunroof and have never ever regretted it. If I want to go topless, I'll ride my motorcycle or borrow my daughter's A4 cab. I hate sunroofs!
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Old 05-25-2014, 06:10 PM   #7
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Has anyone weighed their SQ5? Is the tech spec curb weight of 4400lbs with or without the sunrooof?
(Assuming "with" since the sunroof delete is an option.)

I just weighed my S4 at the local track and mine is about 200lbs over the spec.(I accounted for the difference between my weight and the 75kg European driver. I assume my options account for the rest of the difference? (19" + nav + sport diff...)
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Old 05-25-2014, 06:14 PM   #8
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I've got one without the sunroof and enjoying every moment of it. Where can I weigh it though?
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Old 05-25-2014, 06:24 PM   #9
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Quote:
Originally Posted by MAMOHT View Post
I've got one without the sunroof and enjoying every moment of it. Where can I weigh it though?
Track or a scrap metal place usually has a scale to weigh you before and after dropping off...they may charge you a couple bucks to just simply weigh it though...
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Old 05-25-2014, 06:29 PM   #10
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I've got one without the sunroof and enjoying every moment of it. Where can I weigh it though?
I saw the weight on a standard Prem+ with sunroof at 4409. As soon as I took delivery, I looked for the sticker in the driver's door jam. I didn't get one. I thought they were a mandatory U.S. thing. I saw somewhere that a fully loaded Prestige weighs 4472. If I had to guess, I'd say mine weighs around 4220, but I would need to actually weigh it to confirm that.

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Old 05-26-2014, 07:07 AM   #11
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Quote:
Originally Posted by gk1 View Post
I just weighed my S4 at the local track and mine is about 200lbs over the spec.(I accounted for the difference between my weight and the 75kg European driver. I assume my options account for the rest of the difference? (19" + nav + sport diff...)
Tech specs are usually a dry weight - may or may not include coolant and oils. Would definitely be measured empty fuel. May not include spare tyre. Definitely no driver!
- an empty fuel tank is worth 60kg (130lbs) straight away...

Some larger wheels can reduce unsprung mass (rubber is heavy), so I wouldn't immediately blame the 19's for a weight increase. Nav and sport diff would only add a few kg's.
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Old 05-26-2014, 06:18 PM   #12
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Quote:
Originally Posted by twentysevenlitres View Post
Tech specs are usually a dry weight - may or may not include coolant and oils. Would definitely be measured empty fuel. May not include spare tyre. Definitely no driver!
- an empty fuel tank is worth 60kg (130lbs) straight away...

Some larger wheels can reduce unsprung mass (rubber is heavy), so I wouldn't immediately blame the 19's for a weight increase. Nav and sport diff would only add a few kg's.
Curb weight (US English) or kerb weight (UK English) is the total weight of a vehicle with standard equipment, all necessary operating consumables (e.g., motor oil and coolant), a full tank of fuel, while not loaded with either passengers or cargo.

This definition may differ from definitions used by governmental regulatory agencies or other organizations. For example, many European Union manufacturers include the weight of a 75 kilogram driver to follow European Directive 95/48/EC.

I'm figuring Audi uses the European 75kg driver version. I think someone once mentioned the sport diff adds 80lbs...but I have no definitive info on that.
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Old 05-26-2014, 08:05 PM   #13
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Someone posted in another thread the weight difference was like 68 pounds.
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Old 05-26-2014, 09:16 PM   #14
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Quote:
Originally Posted by twentysevenlitres View Post
Tech specs are usually a dry weight - may or may not include coolant and oils. Would definitely be measured empty fuel. May not include spare tyre. Definitely no driver!
- an empty fuel tank is worth 60kg (130lbs) straight away...

Some larger wheels can reduce unsprung mass (rubber is heavy), so I wouldn't immediately blame the 19's for a weight increase. Nav and sport diff would only add a few kg's.

Quote:
Originally Posted by gk1 View Post
Curb weight (US English) or kerb weight (UK English) is the total weight of a vehicle with standard equipment, all necessary operating consumables (e.g., motor oil and coolant), a full tank of fuel, while not loaded with either passengers or cargo.

This definition may differ from definitions used by governmental regulatory agencies or other organizations. For example, many European Union manufacturers include the weight of a 75 kilogram driver to follow European Directive 95/48/EC.

I'm figuring Audi uses the European 75kg driver version. I think someone once mentioned the sport diff adds 80lbs...but I have no definitive info on that.

FROM AUDI:
Quote:
* Fahrzeugleergewicht mit Fahrer 68kg, Gepäck 7kg und Kraftstoffbehälter zu 90% gefüllt, ermittelt nach der EG-Richtlinie 92/21/EWG in der gegenwärtig geltenden Fassung. Durch Sonderausstattungen können sich das Leergewicht und der Luftwiderstandsbeiwert des Fahrzeugs erhöhen, wodurch die mögliche Nutzlast bzw.
Höchstgeschwindigkeit entsprechend verringert wird.

Google translate:

* Vehicle curb weight includes driver 68kg, 7kg luggage and fuel tank 90% full, calculated according to the EC Directive 92/21/EEC in the currently as amended. Optional equipment's unladen weight and drag coefficient of the vehicle whereupon the possible payload can increase etc.
Top speed will be reduced accordingly
.
Weight is always refers to the base model, without additional equipment
The difference can be up to 250 kg of the same car with different equipment packages
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Old 05-27-2014, 06:42 AM   #15
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If weight and center of gravity are of such concern, why drive a Q at all? Get an S4.
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Old 05-27-2014, 07:08 AM   #16
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Quote:
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If weight and center of gravity are of such concern, why drive a Q at all? Get an S4.
If weight and center of gravity are of such concern, why drive an S4?
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Old 05-27-2014, 07:52 AM   #17
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Also, some people do not fit into s4/s5 or alike. But in SQ5 without sunroof I have few inches of space above my head.
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Old 05-27-2014, 09:29 AM   #18
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Good grief! 104 kgs? I can now imagine how much better handling would be without that weight up there. Pano roof delete probably affects resale though. Someone should go with the delete and fit a CF roof up there.
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Old 05-27-2014, 10:06 AM   #19
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If weight and center of gravity are of such concern, why drive an S4?
I agree with your point. Although S4 wouldn't be my personal choice.
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Old 05-27-2014, 11:03 AM   #20
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I find the handling of my Q with pano roof just great; with what I need it to do even in spirited driving - we go to the mountains quite a bit and I run away from most people there. Could I use more cornering g's - of course, but for an suv it suits me more than fine and most people who ride along for the first time give the roof 2 thumbs up.
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Old 05-27-2014, 11:03 AM
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