992 GT3 Touring approach and departure angles

[dragon02]

Hi, I'm expecting my 992 Touring in a couple of months and currently building a new home on a rather steep block!! Trying to shape the new driveway so that the vehicle does not scrape is proving a challenge so wondering if anyone has first-hand experiences they can share, offer some advice/suggestions as well as approach and departure angles of the car? Thanks in advance.

[sleazius]

It is the transitions that will kill you, not the angle. If the house isn't built yet your easiest solution is to build a garage at street level.

[hugh]

Designing driveway/ramp gradients and transitions is a very specific exercise, especially for low/sports cars. My guess is that the FFL of the home will be determined by various factors (height, setback & planning controls, cut/fill levels etc). So, the garage level will need to be determined by these factors and then need the ramp grades (that will translate to the ramp length) to be then designed accordingly by a professional. Best to consult your architect, if they can’t help then engage a traffic engineer - both need to work together. 

[WGA]

One of the houses I lived in Europe quite a few years ago had an incredibly steep entry into the under house garage. At the time I was driving an Audi TTRS and it was impossible to get it down and into the garage. Fortuitously, one day I was lamenting to my next door neighbour about the fact that I had this garage but couldn't use it because of the impossible entry angles.

He said, leave it to me and went out and measured the wheelbase of the car, the heights mid, front and back, etc.....and after a couple of days came back with a set of simple drawings and said....if you do this you will get it it.  So I went ahead and implemented what he recommended and it worked. Without him I would have continued to park on the street and never used the garage as intended.

So my suggestion would find an engineer who understands the problem and ask him for a suggested solution.

 

 

[sleazius]

I've walked away from property that doesn't have appropriate car storage (or that couldn't be added). That solution @WGA was very nice though

[DJM]

Most of the time, for homes we design and build, we work on 1:8 grade for 2M length at the top then a constant grade of max 1:4 then another transition at 1:8 for 2M at the bottom.  That’s what the Australian standard dictates and most cars will work fine on that.  

if that cannot be achieved or if you have other challenges to consider, get a traffic engineers to give you the answer.    I’ve used these guys a few times for advice, quick and cheap.  Last time was $300 I think 🤷‍♂️

https://amberorg.com.au
 

sometimes can be a problem if council require crossover to come up before you start going down.  The crest can cause bottoming out.  And by coming up initially, you exacerbate the level change.

anyway, recommend calling these guys.

 

Or upgrade to Dakar 😆

[TwoHeadsTas]

On 15/04/2023 at 11:17, dragon02 said:

Hi, I'm expecting my 992 Touring in a couple of months and currently building a new home on a rather steep block!! Trying to shape the new driveway so that the vehicle does not scrape is proving a challenge so wondering if anyone has first-hand experiences they can share, offer some advice/suggestions as well as approach and departure angles of the car? Thanks in advance.

Ian, I'm pretty sure that is the block we looked at 11 years ago, seeing your trials and tribulations makes me glad we went for a flat block at the other end of the suburb 🙂 

[on_booost]

Not discounting all of the above - the wider the driveway - the easier it is to get the right angle so to speak....

Its the old diagonal anti scrape manoeuvre you see all of us doing with low cars.

I had a hell of a time - council was a total PITA and wanted us to mirror reverse the whole house at one stage!! The crossover is "usually" required to go up (edit - as mentioned above) as well - which makes it worse.

An experience concreter will also pay dividends....

 

 

[tomo]

On 15/04/2023 at 19:44, WGA said:

One of the houses I lived in Europe quite a few years ago had an incredibly steep entry into the under house garage. At the time I was driving an Audi TTRS and it was impossible to get it down and into the garage. Fortuitously, one day I was lamenting to my next door neighbour about the fact that I had this garage but couldn't use it because of the impossible entry angles.

He said, leave it to me and went out and measured the wheelbase of the car, the heights mid, front and back, etc.....and after a couple of days came back with a set of simple drawings and said....if you do this you will get it it.  So I went ahead and implemented what he recommended and it worked. Without him I would have continued to park on the street and never used the garage as intended.

So my suggestion would find an engineer who understands the problem and ask him for a suggested solution.

 

 

Geezze mate a couple of scaffold planks and few bricks would have did the same job

[AndrewM]

On 15/04/2023 at 19:44, WGA said:

 

Backing out of that with snow and ice! Ouch! And you wouldn't want to slip sideways!

Respect!

[edgy]

On 15/04/2023 at 22:53, DJM said:

sometimes can be a problem if council require crossover to come up before you start going down.

 

I went through this about 10 years ago with a 996 GT3, and this ^^ was a big factor, so we got the VFC drawings from council first, poured it, signed it off and graded the rest accordingly (at least the council I was in, was not so worried about the driveway on my property). 

The way we handled it was to work on the profile of the underside (road base), it took a few goes of scrape, compact, profile repeat, yes it is a bit of work but a very practical approach that netted us a good result, as its been said a good concreter is key! Once you've profiled the underside it is critical they follow it.  

 

 

 

Our new place we didn't build and I need a set of race ramps to get out until I can get a solution actioned... this one is definitely worth your time & effort in my experience!  

 

[nine11]

Had a similar issue, it's all good to do your homework on driveway gradient etc, however you may need to also factor in the camber of the road in relation to where it meets your crossover.  Saves having to visit Bunnings to buy a plywood sheet pending awaiting a good concreter!

[P0RKY]

I'm no expert, but I suspect implementing some of the suggestions so kindly offered by the others here PLUS the fact that the GT3 comes with the Front Axle Lift might see you get the car up into the garage safely! Good luck - that's one awesome car on its way!

[749dark]

My house that i'm in has the same issue. The first part of the driveway has a very steep upwards kicker from the street. I lamented how to get my GT4 up the driveway without ripping off the front splitter when the wife walks out of the garage with large pieces of cardboard. She places this under the splitter which gets dragged up the driveway (and down) thus not damaging the car. Obviously this isn't a long-term solution as the wife always complains about me taking the car out.

Simple solution is to move into one of our other houses which is what we're now doing.