SQ5/Q5 rear spoiler wing extension project

**Patu** · 04-08-2015 01:00 PM

Hi,

So, having done a little modification project work in the past I thought I'd extend the wing of my SQ5 as I feel it could use a little more length..

First - buy yourself a secondhand wing off Ebay, don't go wrecking your OEM wing - they're expensive new!! Make sure the brake light still works.

Here is the start of the project. I'll update as I get further along.

So I can maintain a consistant & straight edge to my wing and because I want to retain the essential design, just extending an inch or so, I will jsut be cutting out the edge and refitting.

First mark up want you want to cut and decide on the length of your extension. I'm only going for 1.25" as I don't want to get carried away to start with. Maybe I'll go bigger on part 2..

Be vary careful about what and where to cut as you'll want to protect that straight edge.

Next use a dremell or similar power tool to make a fine cut along the line ensuring you 'jig' out the back edge but also using square teeth so you have something to fasten back to the main wing.

Make sure both sides are identical

Next you want to use some body filler just to position the edges in their new location. Make sure you use a lot of hardener so it sets quickly. You'll need to brace or hold the edge in position ensuring that all edges are straight. I used a straight edge to ensure the edge followed the contour of the wing so that the airflow over the wing would be true to the original design. Don't over lift or drop or you'll be adding downforce or lift to the car which you probably won't want.

I then glued wire to add strength but you won't need to do this. I will be adding a core of fibre reinforced plastic to add rigidity but I'll show you that later. For now just run a strip of packing tape along the back edge so that you can fill the gaps along the top and sand. Fill and sand, fill and sand until smooth. Then do the other side the same..

When you are filling, it's very important that you smooth off maintaining the contour of the wing. Use something like a packet of ice-lollie sticks and draw them across the fillerso that you can maintain the contour, then sand it smooth.

So far so good...

**idahospeed** · 04-08-2015 02:22 PM

That is pretty tight.

**q5 dave** · 04-08-2015 02:28 PM

Good work and nice write up. Can't wait to see it finished

Did you ever consider the ABT q5 rear spoiler?

**Silverarrow240** · 04-08-2015 02:29 PM

Can't wait to see finished product! Very cool!

**Patu** · 04-08-2015 02:42 PM

Originally Posted by q5 dave

Good work and nice write up. Can't wait to see it finished

Did you ever consider the ABT q5 rear spoiler?

Yeah I looked at it but it's an extra fin stuck on the top, not really what I was after. I just wanted an RS-style slightly longer version of the OEM wing. You can also get a slightly extended fin from Caractere, there are cheap copies out there too, but it doesn't have the two raised fins like the SQ5/RS6 wing.

Thanks for your comments, here's hoping it turns out like planned..

Oh...and please excuse all the other crap in my garage...as you can see, I share my workshop with a number of other people, mostly under the age of 6!!

**Patu** · 05-04-2015 11:55 AM

A quick update, sorry progress has been slow lately...

I made a small jig so that I could run it the length to keep the edge consistent. I've then been building the edge up and using the jig to run the length before sanding.

I've sprayed so you can get an idea of what it's looking like now the shape is coming together.

**Silverarrow240** · 05-04-2015 12:25 PM

Gotta say... I had my doubts, but that is actually coming together into some serious dopeness...

Looking forward to the finished product.

**Smittylube** · 05-04-2015 08:19 PM

Shit I like the SQ spoiler better than the Q, but now.....I want this!
Nice work. Can't wait to see the finished install.

**CLEANA3** · 05-08-2015 07:34 AM

looks great

**Patu** · 06-06-2015 01:30 PM

Guys,

I thought I'd fit the spoiler to see how she looks.. I'm looking for feedback and interst as I've approached a number of carbon manufacturers and the repro costs aren't too bad.

I thought I'd see what interest there was before proceeding.

Rest assured, the spoiler will be tight and work with all electrics, I jsut want to know if it's worth pushnig forward or is there not a lot of interest?

Finish will either be in full carbon or part carbon part FRP.

Cheers

**98_916sps** · 06-06-2015 01:51 PM

I would buy one in Full Carbon.

Greg
Florida

**QUBE5** · 06-06-2015 02:13 PM

Originally Posted by 98_916sps

I would buy one in Full Carbon.

X2

What would be the price?

**snig** · 06-06-2015 02:47 PM

Originally Posted by Patu

Guys,

I thought I'd fit the spoiler to see how she looks.. I'm looking for feedback and interst as I've approached a number of carbon manufacturers and the repro costs aren't too bad.

I thought I'd see what interest there was before proceeding.

Rest assured, the spoiler will be tight and work with all electrics, I jsut want to know if it's worth pushnig forward or is there not a lot of interest?

Finish will either be in full carbon or part carbon part FRP.

Cheers

Just do FRP, keep costs low, and let people get a good paint match. Even OEM carbon (M3 performance full carbon spoiler) tends to look like crap after a while.

**psiaddict85** · 06-06-2015 05:19 PM

I agree on the FRP as well. Would be in for one of those.

**Silverarrow240** · 06-06-2015 05:24 PM

Originally Posted by 98_916sps

I would buy one in Full Carbon.

Greg
Florida

Me too! I'm all in...FRP or Carbon...

CF just needs a polish once and a while, and it's good as new.

Oh and you did that me hell of a job making that spoiler Patu!! Nice work

**MilesM** · 06-06-2015 05:38 PM

Hold up, SQ5 TDI? Lol

That aside, the part looks badass and I might be interested in a FRP version.

**QUBE5** · 06-06-2015 06:22 PM

Originally Posted by MilesM

Hold up, SQ5 TDI? Lol

I wish Audi brought the SQ5 TDI to the United States, but instead the rest of the world gets spoiled with this magnificent beast.

**snig** · 06-06-2015 07:29 PM

Originally Posted by QUBE5

I wish Audi brought the SQ5 TDI to the United States, but instead the rest of the world gets spoiled with this magnificent beast.

He probably thinks the tfsi is the only SQ5.

**MilesM** · 06-06-2015 11:21 PM

Originally Posted by snig

He probably thinks the tfsi is the only SQ5.

This. Didn't realize there was a TDI version. TIL.

**QUBE5** · 06-07-2015 09:00 AM

Originally Posted by MilesM

This. Didn't realize there was a TDI version. TIL.

The SQ5 TDI is really Audi's true SQ5 since Audi doesn't even offer a 3.0TFSI SQ5 in Germany. The 3.0TFSI was really only offered for the NA petrol addicts.

**Patu** · 06-07-2015 12:17 PM

When I opened the interior molding to undo the holding bolts for the spoiler there is a second electrical unit feeding a green and red cable. Brown and black on the other side feeds the removable tailgate light but does anyone know what the other unit is? These cables are glued into the spoiler and cannot be replicated.

UPDATE: OK so I think I've managed to work this one out on my own...it's part of the antenna booster system for the DAB system. The remote antenna on top of the roof also extends (believe it or not) into the spoiler and the two cables I believe are simply the aerial extending from the unit show below which is the Antenna Booster Unit!

Further investigation required into this but can't imagine this is going to be a difficult part to include with the spoiler.

OEM 3rd brake light will be included.

Initial cost estimates including all fittings, brake light, etc will be around USD $1000 for the full carbon version, slightly cheaper for FRP and the customer can choose.

Details to follow..

**IanSQ5** · 06-09-2015 05:34 AM

Are these going to be 'wet lay' or pre-preg auto clave carbon?

Also I assume that it will be a composite top piece attached the OEM underside with the brake light?

**Patu** · 06-09-2015 07:44 AM

Originally Posted by IanSQ5

Are these going to be 'wet lay' or pre-preg auto clave carbon?

Also I assume that it will be a composite top piece attached the OEM underside with the brake light?

I don't know of the final material yet but can of course provide details when I get that far - once I've selected manufacturer. Do you have a preference? I have asked my preferred supplier in any case.

No, it will be a complete carbon/FRP unit with appropriate opening to fit the OEM tailgate light and feed the cable. You cannot separate the two pieces of the OEM spoiler, it comes complete/glued.

You will not need your own OEM spoiler/light to work with these, it will be a complete unit, OEM tailgate light can be included or not to your specification.

Cheers

**IanSQ5** · 06-10-2015 12:51 AM

Wet lay will be cheaper but comes with its own issues on post curing and shrinking, pre-preg would be the route I would recommend but its significantly more expensive but the result will last longer.

I can point you in the direction of one of the best composite companies in the UK (they produce F1 parts!) if you need any any more quotes.

Thinks to consider are what method they are going to make the part (wet lay or pre preg autoclave) what the mould is to be made from and how many pulls you will get per mould before it needs remaking.

Its looking good though, nice work.

**Silverarrow240** · 06-10-2015 05:47 AM

You two should DEF collaborate on this one!!!

**IanSQ5** · 06-10-2015 05:59 AM

Id like to see it maybe a bit more aggressive with a slight kick on the end

**Patu** · 06-10-2015 03:10 PM

I wondered the same thing.. It's not too late to extend it further, I just didn't want to impact the aerodynamics too much without proper analysis tools to determine the best angle... A little too much and you might get excessive drag at high speeds..

I emailed C6 to ask if they wanted to see the spec sheet to quote but not heard back.

**IanSQ5** · 06-11-2015 12:52 AM

I was at C6 HQ last night, we discussed it. Do you have CAD drawings or just the prototype part?

here is a Scirocco spoiler that Paul did recently, obviously with a bigger lick than I think would work best on the Q/SQ5

I think a nice subtle kick up at the end and maybe a touch longer would be better, possibly without the lower section in the middle (although drag will increase by removing this). still think more like Jon Olsson's RS6 spoiler.

**Patu** · 06-11-2015 04:26 AM

Thanks Ian - so an update...

I don't have CADs only the prototype. But I do have a full specification document with full measurements and all picture angles etc, I've sent this to Paul so thanks for giving it a mention.

One of my manufacturers uses the pre-preg method and also have multiple autoclaves so seem like a better option even though they are more expensive. Thanks for the heads up on that..

The upside of using China aside from them being cheap, they can export Internationally at very low shipping rates. I'd be interested to know what C6 can do price wise but the shipping ex-UK is a killer making it near-on impossible to export even if they come in comparably. Without a doubt C6 stuff looks amazing, it's just the costs I'm not sure about.

In terms of design, I tend to agree and like the look of both Olsson's and the Scirocco design here. The problem is that the slope on the rear of the SQ/Q5 is very low in comparison and a big upwards lip on a rear spoiler will create a great deal of drag at speed. Without proper wind analysis functionality such as from Solidworks, I can only estimate. I can extend it slightly more and extend the current uplift which is more noticeable now I've already extended it but I wouldn't want to create a Porsche Whale tail look-a-like..

I will look at extending the wing by another 1" or I have a second wing I could develop separately..

:)

**IanSQ5** · 06-11-2015 05:26 AM

Jonnie If you are prepared to sell the other wing I will take it off your hands if the price is reasonable (I wont be looking to make and sell though, I will leave that to you!)

**Patu** · 06-12-2015 12:40 AM

Originally Posted by IanSQ5

Jonnie If you are prepared to sell the other wing I will take it off your hands if the price is reasonable (I wont be looking to make and sell though, I will leave that to you!)

Keep scanning on Ebay for 'Audi Q5 Tailgate' there are loads on there from wreckers. I got both mine by asking them to sell me the spoiler off a full tailgate, they've always been happy to!

**SQ5LIFE** · 02-23-2016 11:10 AM

Hey guys soooo, any news of this project? I have a 2016 SQ5 and was hoping to get some nice sporty spoiler. Let me know whats going on with this. Thanks.