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Hi guys,

 

As most of you know by now, we - in Qld - have been racing this class in various formats since late 2005. It all started with PETG Porsche 996's and steadily progressed to the full blown GT class it is now. This class caters for everyones likes - body wise the choice includes plastic modelling kits right up to the very fansy and expensive handmade carbon fibre master pieces form Fola and Nick de Wachter. Chassis choice is similar, anything from your basic Plafit or Scholer to the very best of the best commercial runs offered by Garry Johnson, Fola, NDW and the like.

 

I have not raced this class since 2007, so I decided to make an effort and get involved again. My choice of body has been the Scale Auto range (which you may realise has become somewhat of a passion with me). I like the bodies as they are very well detailed and has better crash resistance than normal plasic modelling kits, whilst they are still affordable - starting from $29 for a white kit. From this range I decided to choose the Porsche GTR and the Audi R8 LMS - It has been a longstanding habit of mine to build two cars and then deveolpe one against the other for maximum performance extraction.

 

The class rules (very losely and in summary) provides for a minimum total car weight of 160 grams, here is my Porsche...

 

20130625_135416.jpg

 

...and my Audi (please ignore the wheel inserts on it's roof - still had to put them into my wheels of choice).

 

20130625_135358.jpg

 

You may be wondering how I got these cars so close to the minimum weight limit - I'll get to that, but let me just say; there is no extra lead on either of the cars, only the chassis and body as built...... The minimum body weight of the class is 45 grams (both cars are the same, so I'm only showing you one).

 

20130625_140741.jpg

 

Now when I show you both the cars underside, look closely and you may spot a few differences, that account for the weight control. Here is the Porsche....

 

20130625_135435.jpg

 

....and here is the Audi.

 

20130625_135502.jpg

 

The body weight secret lies in the body mounts... DoSlot has developed this chassis system with aluminum, brass and carbon fibre body mounting plates....so you simply use the plate that will give the correct end result.

 

20130625_135702.jpg

 

DoSlot is a German company and their chief designer and engineer, Sebastian has specifically developed this chassis for the Scale Auto bodies. One can get all the correct body mountings and simply take the Scale Auto body off your Scale Auto car, then screw it on to this chassis and you have a Modern GT. Two classes, one body - too easy. (Those of you that know the Scale Auto rules, will realise that these two bodies of mine are not legal for those rules due to a few bits on them).

 

Here is my Audi and it's DoSlot chassis, side-by-side. For the Aussie specifications, Sebastian has titled the chassis 'RedBack' and it certainly is a lethal weapon.

 

20130625_135841.jpg

 

....a closer look at this work-of-art.

 

20130625_135902.jpg

 

Now I just have to get them to a track and race - hopefully all the local hotshots will give me a break and allow me some glory with my two new cars.

 

Cheers,

 

Jan

Edited by Springbok Racer

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These are beautifully built chassis. The torx screws are a nice touch. I'm now on my 3rd chassis build [2 for me]. I'm Currently developing the chassis with different spring settings,different roll outs and tire widths. I'm sure I will get into the 5's at Narangba soon.

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sure Jason.nothing over the top.just a scholer striker. comes with 10mm brass body mounts.

cheers

warrick

 

 

kz4chassis_zps2ee3ba7c.jpg

Edited by warrick

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just got back from its first run in race trim.some tuning to go yet but it did a best tonight of 5.95 at Andrews.still experimenting with gears & rear tyre widths,so there is more to come yet.very stable to drive though.

cheers

warrick

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Interesting... The Modern GT's with Fox motor's and any chassis are not much faster at Jans than a tuned Scaleauto with 1.8 clearance. Is it worth trying the Scaleauto Chassis in Modern GT? With the rules allowing reduced tyre diameter, lighter body and chassis components and lowering to 1mm it might be fast. Its certainly got the weight down low. At Jans with 1.8mm clearance I know Noel has broken the 6 sec lap barrier and I got into the 6.2's (in a Scaleauto Enduro). So... anyone fast with a modified one at Nerangbah?

Edited by axman

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Interesting...At Jans with 1.8mm clearance I know Noel has broken the 6 sec lap barrier and I got into the 6.2's (in a Scaleauto Enduro).

 

Hi Kim,

 

Just a correction; the quickest that Noel has gone around on my track is a 6.125 and the fastest a Scale Auto in race trim has ever gone around my track is a 6.049. No Scale Auto of any kind have ever broken the 6 second barrier.

 

However. it will be good to see what your suggested specs using a Scale Auto chassis will achieve.

 

Cheers,

 

Jan

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Oops.. Thanks for the correction guys... got my tracks mixed up.

So whats the fastest a Modern GT has gone at your track Jan...

And how fast are they now at Nerangbah? NZ Paul, as the "official" Modern GT Rep you should have this info...

Edited by axman

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Lovely looking chassis. I am a big fan of the scaleauto cars. I can't remember a class of car i have enjoyed as much as these but perhaps it is because they are so much simpler than Plafits and all my previous experience is with plastic. I could be wrong but it looks like a much better chassis but a less powerful motor giving a similar time? One of the good things about the scaleautos is that they punch and stop just like a real car even if they are a bit more..... hmmm 'agricultural' compared to more exotic chassis. They give a more life like experience compared to underpowered heavy cars. Would going to a more torquey motor be better or simply too much speed?

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Scale auto with a fox only get @ 6.0 sec at Narangba, even at 1mm ride height, a couple of people run them but they are a little off the pace.

They are ok in std trim with the bigger motor getting @ 5.8 but is not really the same class of car.

 

The fastest Modern Gt cars are doing @ 5.6 - 5.7 sec but there are a bunch in the 5.8 - 6.0 bracket.

 

Bring your cars and have a go, remember this is a developement year and these cars will be in a class of their own next year, a true open chassis class, its great to see loads of different bodies, it is a class that if you get a body to suit a chassis you will go fast, and there are many different ones on the track already from Plafit SLPJ to SLP2 and Scholers to Doslots, they are all very similar in pace.

 

This is an elite class and should remain this way. emphisis on detail in the bodies is a must.

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Thanks for the info Paul... as Jason says, my Scaleauto might have to go to Jeny Craig.. and go on a Carbon diet.

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I cant see any reason why a scale auto chassis plate based car cant be competative if built correctly. I ran a standard plafit 1700 chassis last night (blueprinted and re-assembled) in its first outing with a scale auto porsche body and it will dip into the 5.7 at narangba. I only finished one lap behind werner and would have been closer if i didnt have a crash in the last bracket trying to set a fast lap on green.

 

On the body issue in my opinion i think we should keep them to scale there are already a lot of out of scale (width stretched) gfk bodies going around. Have noticed that OEPS have adopted a max spur of 83mm which eliminates the custom made scale altered bodies. (just my two cents worth)

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Jason,

 

I'm with you on that. Also the 83mm maximum spur makes a lot of sense. Some of the bodies, especially when setup on 78mm wide main chassis plates, look like pyramids. And even worse when the maximum spur of 86mm is being run. I mean that is wider than most LMP's.

 

Anyway, let's have a photo of your 1700 shod Porsche - inside and out.

 

Cheers,

 

Jan

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Totally agree Jason... As Paul NZ stated the emphasis is on detail.. So out of scale bodies have no part in this class of racing.

I totally support the 83mm rule as there is such a great variety of bodies properly scaled for this class and the 45g body weight keeps things pretty even between GFK and plastic body's like the Scaleauto's.

As a racer that likes to experiment this class ticks all the boxes because we can be creative, try different chassis and because its not tied to any one manufacture, any track or club can run their favourite local chassis.

This class has the potential to be the major open scale class in Australia.. So lets keep it scale and make it accessible to all.

( I might point out this statement coming from an old wing car racer that has seen the death of Slotcars from excessive expense so don't allow the rules to favour the biggest spender )

Edited by axman

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Jason,

 

I'm with you on that. Also the 83mm maximum spur makes a lot of sense. Some of the bodies, especially when setup on 78mm wide main chassis plates, look like pyramids. And even worse when the maximum spur of 86mm is being run. I mean that is wider than most LMP's.

 

Anyway, let's have a photo of your 1700 shod Porsche - inside and out.

 

Cheers,

 

Jan

Don't want to show all my secrets Jan. Its a RTR car same as this but with standard body mounting plates and a scale auto Porsche with the body posts cut off 1700SR_zps720c9929.jpg

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Don't want to show all my secrets Jan. Its a RTR car with standard body mounting plates and a scale auto Porsche with the body posts cut off

 

Jason,

 

I thought showing your car inside and out, was the whole reason for this thread?

 

Jan

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Yes, I'm intrigued as to how you get a 1700 to go as quick as an SLPJ or an SLP2 or a Doslot for that matter, most people are struggling with getting below 6.0 yet with no practice you are doing 5.7? what is the body weight of your car? what is the total chassis weight? it needs to be 45 body and 160 total, you will need a lot of lead on a 1700 to achieve this, some pictures of your car would be nice. Hope to have a look on Saturday at the QPC.

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