Automatic Boot Spring Open

This section shows how to carry out modifications to your 1 Series. Please remember that if you are modifying your car to take photo's at each step and document the mod in here.
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E87Gaz
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Re: Automatic Boot Spring Open

Post by E87Gaz »

Ah. Thank you. Makes sense.

Blakey916
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Re: Automatic Boot Spring Open

Post by Blakey916 »

Got my Octavia struts, they're about an inch too long so not much good!


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2004 BMW 120d Sport
2004 120d... In progress ;-)

Thomas.E
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Re: Automatic Boot Spring Open

Post by Thomas.E »

Blakey916 wrote:Got my Octavia struts, they're about an inch too long so not much good!


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2004 BMW 120d Sport

Is it hatchback we talking about and did you buy art nr. ST018306 it will fit.
Octavia strut length is 403mm and BMW strut is 411mm about 8mm differance (0,31 inches longer then Octavia strut)
BMW 118d Hatchback-09 - Eibach B12 Pro-kit

hhorner
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Re: Automatic Boot Spring Open

Post by hhorner »

I am going to try and do this on my 1 series. Is there anywhere to buy the springs without ordering online? Do any DIY stores sell them?

Also, if I do need to change my struts as well, where can I but these from? Don't want them to be too expensive but would prefer new to used ones.

Thanks

divingmcdiveface
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Re: Automatic Boot Spring Open

Post by divingmcdiveface »

Hi all

Sorry to drag this one alive again, just wanted to share my combination of springs and washers


The spring, in a fetching BMW Blue :o was from Amazon here https://www.amazon.co.uk/gp/product/B07 ... UTF8&psc=1

I bought a packet of 1/2 inch tap washers from Wilko
At first I put two of the tap washers on but I could see on the other end of the strut, the bracket fastened to the chassis was moving ever so slightly as I started to put force onto the boot lid
Image

So I cut one off and replaced it with a washer approx 1/2 the thickness
Image

The boot opens fully and the bracket at the chassis end of the strut doesn't seem to flex.

Tyler
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Re: Automatic Boot Spring Open

Post by Tyler »

divingmcdiveface wrote:
Thu Jul 11, 2019 4:19 pm
Hi all

Sorry to drag this one alive again, just wanted to share my combination of springs and washers


The spring, in a fetching BMW Blue :o was from Amazon here https://www.amazon.co.uk/gp/product/B07 ... UTF8&psc=1

I bought a packet of 1/2 inch tap washers from Wilko
At first I put two of the tap washers on but I could see on the other end of the strut, the bracket fastened to the chassis was moving ever so slightly as I started to put force onto the boot lid
Image

So I cut one off and replaced it with a washer approx 1/2 the thickness
Image

The boot opens fully and the bracket at the chassis end of the strut doesn't seem to flex.
Which size springs did you order from Amazon? 20x25?

divingmcdiveface
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Re: Automatic Boot Spring Open

Post by divingmcdiveface »

Tyler wrote:
divingmcdiveface wrote:
Thu Jul 11, 2019 4:19 pm
Hi all

Sorry to drag this one alive again, just wanted to share my combination of springs and washers


The spring, in a fetching BMW Blue :o was from Amazon here https://www.amazon.co.uk/gp/product/B07 ... UTF8&psc=1

I bought a packet of 1/2 inch tap washers from Wilko
At first I put two of the tap washers on but I could see on the other end of the strut, the bracket fastened to the chassis was moving ever so slightly as I started to put force onto the boot lid
Image

So I cut one off and replaced it with a washer approx 1/2 the thickness
Image

The boot opens fully and the bracket at the chassis end of the strut doesn't seem to flex.
Which size springs did you order from Amazon? 20x25?

Yes. The ones in the link posted above.

divingmcdiveface
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Re: Automatic Boot Spring Open

Post by divingmcdiveface »

Having had a bit mess about with this tonight I found that after the washer was put under some load (and probably compressed slightly), I found it was only opening half way.
I ended up adding another metal washer to it and now it seems much better. The total unloaded length is now 35mm so if you went with 20x35 make sure you use a compressible rubber grommet otherwise the total length under load might be too long and start to put the fixings under too much strain.
The washer is only there to stop the spring rattling around, but due to the hardness of the tap washer it adds some length to the overall spring.

Octavius
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Re: Automatic Boot Spring Open

Post by Octavius »

Some nice marks on the Strut top plastic mount. What have you been using to remove it, mole grips :shock:

divingmcdiveface
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Re: Automatic Boot Spring Open

Post by divingmcdiveface »

Rather than use springs, has anyone tried a different strut with a much higher eject force??
The highest direct replacement for the F20/21 from Stabilus had an eject force of 470N (the highest I could find), but the struts on an Audi TT have 630N and the dimensions are very very close. I took a look at some Youtube videos on replacing the struts on the Audi and the couplings on the end of the struts look exactly the same to me.
I'm going to ask the next Audi TT coupe owner I see if I can have a look at his struts.... :lol: :lol:

These are for the F20/21 https://www.buycarparts.co.uk/monroe/11727239

These are for the Audi TT coupe 2007 to 2014 model https://www.buycarparts.co.uk/monroe/11726875

Thoughts and comments..

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mayhem
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Re: Automatic Boot Spring Open

Post by mayhem »

Hello, I would first like to thank you all for sharing your experiences here. It has inspired me to do some maintenance and modification to my own car.

I have recently tried this on my 2009 e87. Bought myself some 25mm and 32mm light load springs, not knowing which ones will work best for me.
Tried the 25mm springs first and it just barely popped the boot open. I was obviously not satisfied as I was hoping for it to fully open.
Put both the 32mm springs in and here's the result:
https://www.youtube.com/watch?v=WwhVqoXQBW8
Now that the weather got colder it opens even less :(

Am I correct to assume that the struts are to blame for this poor result? It looks to me like they are the 10 years old original parts.

I'm posting here seeking advice. What should I install in order to achieve the desired goal of having the boot fully open?
1. 2x new bmw compatible struts 411mm long, 400N force
2. 2x new octavia struts 403mm long, 580N force
3. 1x new octavia strut paired with 1x new bmw strut
4. 1x new octavia strut paired with 1x my old bmw strut

In the end I'm hoping I could use the 25mm springs as the 32mm ones seem rather long. It makes me wonder how does it even close anymore.

Thank you!

divingmcdiveface
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Re: Automatic Boot Spring Open

Post by divingmcdiveface »

I've removed the mod now. I was fed up with inconsistent results and the constant worry that one day they'll snap the connector at the end and shoot off into the rear light cluster. I tried the Audi struts and even with 630N of force it made no difference whatsoever, you still need the spring to give the boot an initial kick so to speak.

It's up to you but I suspect it's more worry that it's worth

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