SlotForum banner Nissan GT-R GT3, 2022 DiSCA GT3 Spec

9335 Views 72 Replies 10 Participants Last post by  tamar.nelwan
Having finally received my long awaited Nissan(s) and posted on their appearance in stock form ...
..they may stay like that until we return from Rockingham's Tres Petit Le Mans...but def not much longer...
... as the #23 car will be raced by my team @ Suzuka in the DiSCA GT3 race of Jan 29th 2022.
So this topic will be on how we'll prep the car(s) to DISCA GT3 spec, meaning chipping it adding lights (that will be fun)
And the fabrication of some flexible lightweight components (vacformed interior & windows, laser cut rubber rear wing mounts)
Team might even have even a certain Italian guest driver. ( and no this time that's not Grunz)

Tire Land vehicle Car Vehicle Wheel

Hard Nut to crack.

This specific Italian gentleman has given me a very hard nut to crack, cause when I check the reference pictures of this exact car...
...and compare it to the car, I can only find some extremely small areas where I can possibly improve the stock car.
More than happy to extend the black on the side skirts, as reported masking on stock car not really a match to the fine finish of the rest of the car
Wheel Tire Vehicle Car Automotive tire

And there are the solid rearwing supports, these can be lasercut from rubber with some of the openings of the 1/1 wing.
Can also extend the slots for the supports further down the trunk, will give the rubber supports even more room to "Flex"
But look at the detail, Tail lights surrounds painted in correct color...even that embossed Nissan logo is represented on the car

So..make note, add red tow band and some mesh in the lower grille. Rear window seems to have a split frame underneath (decal?)
The only thing that looks a bit "off", is the back end of the roll cage...but haven't been able to score good ref pictures of it.
Wheel Car Tire Vehicle Automotive design

DiSCA GT3 rules have a more (box) standard approach , so no trick pod mounted diffuser on this car.
Stock screws already replaced with SV Workz Titanium M2.2. Side suspension will be fitted.
Not clear yet if 1,0mm Offset Evo pod will give 1,8mm Ground clearance under motor with 20,8mm ø Scaleauto Procomp wheels.
Regs require running Scaleauto Baby Sprinter motor, hope that won't piss off "Italian guest driver" too much.
But then again Pace car he will also drive will be fitted fully with stock parts...including stock traction magnets :oops:
Yep you read it right, Traction magnets, nobody is going to bump the Official Pace car off the track on the formation lap(s), as previously happend at Le Mans 😇

O201C chip obvious choice here, testing will determine if it should be mounted longitudinal or transverse (weight distribution)
Good thing about running that big GT-R is...plenty of real estate on chassis for either configuration.

Body works
Side skirts will be cut of chassis and glued to body, most likely will do the same for the front splitter to allow independent set-up of body and chassis.
4 small Body supports will be mounted in body right in front of rear wheels and behind front wheels.
4 grub screws will be added in chassis underneath to adjust ride height. Been there done that...doing it next month
Dive plates are integrally moulded with the body, pretty sturdy too...will have to see how those will withstand the challenges of Digital racing.

Stock body now at 23,7 total. Vac formed but detailed interior should save 3,5- 4,5 grams off. Not too much gain expected from vacformed windows... plastic windows are already at minimum. So estimate maybe 5 -6 gr max from total vacformed parts.
Which mean there will stil be a lot of (careful) dremeling & scraping to get the whole body down to 14-15 there's room enough for.....
Automotive lighting Product Black Motor vehicle Font

Light(s)..let there be
Estimate 3,5 gr needed for SP44 light kit to power plenty of LED's, Slot it has moulded front lights as separate parts, so these can be done off the car.
The only Jazz I might be able to add will be some pretty purple led light peeking through the front grille.
That is unless DrC and Flag Slot manage to get their "functional LED Number/ Position Display" functional in the next month.
Oh.... good finally see somewhere I can cut into the body, opening up the bumper for the bottom purple leds :)
Automotive tail & brake light Vehicle Hood Automotive lighting Car

Ok that's it for now, got my to do list for the Nissan(s) but next update will have to wait till next month... but definitely

To be continued

With kind regards
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Wow! As always, a pleasure to read your projects Tamar!👌🏼

In the clubs I race (analog) won’t let me cut the side skirts as you say, nor the bumper, but definitely will be following your project and see what I can use in mine😀

Love the idea of the purple lights, very tuner style(as should be any Japan Gt car)😃

Also your comment about the Pace car with magnets made me remember of the Days of Thunder movie🤣:

Harry “I want you to hit the pace car”
Cole “Hit the pace car, what for?”
Harry “Cause you hit all the damn cars and I want you to be perfect, come on, go go go”


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Daniel, you need to move to a digital! We can let you cut whatever you want ;-)
The only guy around here who was(is) an authority in digital racing (he owned the only private club track 10 years ago), is my pal Marc Santos, he plans to open again a private club track anytime soon in the near future, but until then it’s the only formal way to get into the digital racing for me(of course I could buy a digital set for home racing or adapt to oxigen/scorpius)… you know what? I’ll see how the income for end of this year goes and if everything is ok, maybe next year I’ll be adapting my track for digital racing(pray that Policar releases the Lc please!)😉

I die to race GTAM, GTPRO, LMP1 and LMP2 in the same track, simultaneously!😀


ps. Little off topic but had to ask, Scorpius or Oxigen?
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And you don't have to Daniel.
There are 3 reasons for doing this mod.
  1. It will allow independent ride height adjustments of Chassis and Body
  2. It will lower the chassis weight and increase the body weight...but way down low. Nice if the rules allow you to lighten bodies and shift weight around.
  3. It will allow more accurate support of body on chassis (in combination with grub screws added on chassis and some supports glued in body)
Now obviously your club rules don't allow any of this...but you can still have some of the benefits of point 3.
The downside of a slotcar constructed in a way that the body rests on the outer edges of the chassis (side skirts, front-splitter and diffuser) ... that its very hard to have/control that contact...hmm how shall I say this....evenly around the whole perimeter.
The body will make contact with the chassis everywhere, or better anywhere at some point.
So to get more control, adding 4 small drops of cyan glue to underside of the body above the corners of the side skirts( in front and behind the wheels) would help.
Because now the body will only rest on 4 points of the chassis......instead of everywhere anywhere....much easier to check and adjust if pressure is divided evenly.

With kind regards
Wow! You nailed it 😮, I n fact when I was adjusting body to chasis screws I noticed that the body “rocked” funny(which later test on the track confirmed it), had to left a bit more lose all the screws to get a decent movement of the body “over” the chasis and get more stability on track.

Mmm seems I will try those 4 points of contact, I like the idea 😀, thanks for the tips 👍🏼

Did I just call her a she? yes I did, GT-R might be a gorilla...but I do think its a female Gorilla
With all those curves I bet is a female, just look at that a***😉

I do not know Tamar, if the driver were a bit lower
Maybe we should call Yuki Tsunoda, bet he would sit lower🙃

Btw I do sometimes remove the whole interior and put a plain black tray with just the pilots half body and helmet and a steering wheel, buts that only when there’s no space for another option…or if I get lazy🙂
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Back to Basics
Hello Slotfriends, with the Rockingham race now well behind us (still recovering) and Suzuka next on the calendar its about time to start working on the Nissan GT-R and build it too DiSCA GT3 spec.
Its been a while since anyone posted on the specs of such a slotcar...
So for starters here's a breakdown of what parts are needed and which areas need attending.

View attachment 289110

0: Scaleauto Procomp4 20,9mmø, Stock inserts fit (more info on that subject will follow in a later post)

1: Motorpod, two options here, Safe one would be 0,5 offset, critical one would be 1,0mm offset. 1,0 barely makes 1,8mm GC on new wheels and would require motor to be raised by 0,2mm.
Ideal would be a 0,75mm offset...but that unfortunately does not exist as an AW in the range.
For all options ballbearing type preferred.

2: 16mmø AW Spur, gearing most likely 12x28.

3: You can use the stock (6,5mmO) pinion or when motor pod modified you can also use Sigma/ Scaleauto/Mitoos M50 nylon 12t (6,8mmø)

4: Use of evo -Side suspension preferred but will need some material to be removed from body (side intakes) for clearence.

5: Scaleauto Baby Sprinter Motor SC-0027b (Long can Boxer type) Don't forget to mount Endbell adaptor upside down.

6: Hall sensor to the right mounted on foam pads.

7: DiSCA rules require 1,8 Ground Clearance C under the centre of the motor. The reason for this is that first of all we did not want the GT3 cars to have too much motor magnetism. Secondly we wanted specs that would be achievable by all brands with as much off the shelf parts as possible. Stock NSR cars are well above that 1,8 GC under the motor.
For the Nissan to clear 1,8 GC with a 1,0 offset pod, two 0,5mm shims are needed to lift front of pod to position Motor level with techblock/track rails.

8: Protect base of antenna with some 2k glue and Shrinktube. Funny detail, wanna know how tall the Nissan body is? well the O2 Antenna fits under body in almost fully upright position. 😂

9: O201C1 chip mounted @ 90˚ on foam pads. Stock chassis has some nice locator pegs to correctly fix the chip correctly over the various LC Led openings. Clicks right in place. But I would advice a more "soft" placement to isolate chassis vibration and dampen forces during inevitable digital crashes.

10: Stock plastic Front wheels are fine, true and glue stock front tyres. With superglue coating total would be ≠ 20,2mmø. Inserts pop right out, you could drill some holes in the back face of the rims, safes a bit of weight and makes removing inserts even easier.

11: Now we are arriving at a problem area. With the stock guide the front of the chassis sits a bit high.
Straightening the chassis as I described in this post has cured this. Will repost it here at a later stage.
Stock "clip in "guide is limited in guide ride height adjustments, best candidate for replacement/upgrade would be the new Ch89b guide.

12: With Chassis straightened the body rests much better on the chassis...but due to profile of front splitter how the body rests on the chassis will vary under acceleration and braking.
My preferred option would be to cut the Splitter and side skirts and mount them to the body. That way you can adjust Body ride height and Chassis ride height independently. (all allowed by DiSCA GT3 rules)

Ok that's it for now Gents
to be continued

With kind regards
Fabulous post Tamar! I’ll have to buy at least two more GTR and try an Aw set up 😀
I still can’t get my Nissan GTR to the pace of the Maserati @tamar.nelwan
I fitted some spacers in the motor mount to lower the stance of the car, it’s running on Slot it G25(thinking about changing to Scaleauto AS25), both cars (GTR and Mase) with same gear ratio , the GTR is to the max width possible in the front axle and the rear almost to the width of the body but still not visible from upper side view, also changed the braids for some ultra thin Sloting Plus, has some ballast (about 5-7gr) in the middle -front section of the chasis and of course the front tires just barely touch the track.

But it’s still +-2 tenths per lap behind the Mase ☹, not fair I want to race the GTR but the Mase is the best shot I have by now 🥲
For some of the DISCA races, we need to use scaleauto sponge tyres.
Wood track right?
No, Ninco

We’ve been racing using the ProComp3 (and now 4) for DiSCA GT3 on Ninco track since 2015.
Wow! I thought sponge tires would be torn apart on the abrasive surface of Ninco track 😯
The idea is that they do have to be "torn apart" ;-)
More seriously, Tamar and Gary have done a lot of testing when this rule set was put together.
The Procomp 3 rate of wearing on Ninco is good enough for a race of 1 to 1,5 hour.
The DiSCA GT3 Euro Series was set up such that teams have to use some strategy to with tyres.
Initially, the organisers handed out 2 sets of tyres and that was all that you got for practice, race 1 and race 2.
At the beginning of each race, the cars must have a clearance of 1.8 mm under the motor.
So you had to use both tyres over the practice session without wearing them too much otherwise you would not pass the 1.8 mm (I learned this the hard way on my first race).
I think it was (and still is) a very good race format.
Nice idea to involve tires strategy, just don’t get Binoto on your team and you’ll be safe 😉
So sponge tires are cheaper than rubber ? I mean what diference makes using Scaleauto 19.5x10AS25 racing slicks or 20x11AS25 vs sponges , or is it the whole advantages (price, performance, degradation, easier to true, etc) that gives the sponge tires an edge over the rubber?

It’s a pure academic interest as nobody around here races on sponge tires and I don’t even have wheels for those tires, but I’m curious.
Because one of the things DiSCA rule sets set out to do, especially with GT3, is to facilitate as much variety as possible on the grid. Would you like to race a 62mm Porsche against a 66mm McLaren?

And the fact is that we’ve achieved that. If you look at our GT3 grids over the years the range of different cars has always been apparent. Scalextric body cars have both won races and achieved podiums and I think thats a direct result of us balancing the width around narrower cars.

Anybody that’s been racing slot cars for a long time knows that whether it’s a club race or national competition there’s always that one car that’s favourite for any given rule set. A look at the UK Analogue GT3 Nationals for example sees several years of “every car is a Corvette C7R” and has now become “every car is a Scaleauto Viper”. That sucks in my opinion. I’m not singling out this series btw, it happens everywhere.

Except DiSCA…

While it’s not quite true that every car in a twelve (plus..) car grid is unique, it’s happened on several occasions, and if there are duplicates in a field then there’s usually only two of any given car. That’s a huge win for the ruleset and one of things I’m most proud of having achieved with DiSCA as a whole.

While it’s true we could BOP every single car individually the amount of work to do that and amount of cost we would incur to test everything would be astronomical. While I wish that administering DiSCA was my full time job, it isn’t. I don’t even have regular access to a track, and Tamar, Gio and others are extremely valuable to our organisation because they do, and can test here and there.

DiSCA has a donate button on it’s website which has only been used once since 2015. And while I’m not lobbying for donations I would like to use it as an example that people don’t care what it takes to create solid rule sets and organise competitions of a high standard. They just expect it to happen. And again I’m not complaining, I’ve done this long enough to know this is just how it is. But if anyone has expectations for individual car BOP then you better get clicking that button so we can buy every car on the market, chip it, and spend 8 hours a day testing 😉
Great post mate. 👍🏼

I think the only way to get the hobby alive and get a chance for it to grow, is to include people with love for the hobby and that extra money that they can spend without too much problem, I know maybe it’s not me or you this last guy, but believe me, they are out there. Personally I have meet and make friends with some guys who (for the love of the hobby) have sponsored one day slot fests(and many more things), paying all costs and entry fees, inviting all guys to this kinda of events and guess what? Even with free access and free food and free track, people don’t go because many times they got complexes that won’t let them enjoy the hobby(human specie are way to complicated 😅).

There’s no secret formula to involve those guys with enough money to invest/sponsor the hobby, but I’m pretty sure they will follow an honest effort for the hobby and those who inspire and transfer the racing spirit form the 1:1 tracks to the 1:32 world of slots.

It wouldn’t be a bad idea to ask the Masterslot guys in Spain on how they finance their events, but as far as I know, it’s an event with 40 teams or so(3 members per team), with a waiting list of more than 20 teams, so they must be doing something good for an analog event😉

Like Bon Jovi would say, “keep the faith”

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I would add to my last post , take for example F1, Stroll (Sr) is a character that many don’t like but without him there wouldn’t be no AMRT, we need those teams for F1 to exist, same goes to slot cars and fortunately, there are people far more nice than Mr Stroll 😉
Coming back on the topic.
I've received some Sponge tyres, SC-2020 as set by the Disca rules.
I've tested first on my GT-R GT3...and men! What an improvement!
So I've tested the tyres on two other cars.
On the left, the Nissan GT-R GT3, then the Sideways Huracan, and then the NSR McLaren.
View attachment 316769

As discussed on other topics, I also have tested difference between loose and tight motor mount.

My wood track is 15m long, with the Nissan, I've improved the lap time by half a second from 5.39s to 4.88s. Best lap with loose motor Mount.
And more importantly, there is a hudge improvement in the car handling.
I'm so happy that a tyres swap can make this car a very good performer. I still think I need to had some weight to reduce the de-slot and improve the lap time.

With the Huracan, there is an improvement by 0.250s, at 4.661s for its best lap. Best lap with loose motor Mount.

With the McLaren, the time is improve by 0.42s, with a record lap of 4.520s! Best lap with tight motor Mount.

All cars see their lap times improved by quite lot, considering the track length.
Also, all cars run smoother and quieter with sponge tyres than with rubber tyres.
In handling, the best improvement is with the Nissan GT-R GT3, the car finally became competitive.

Regarding the loose/tight motor mount. With my short experience, the results seems depend on the car and its mount type.
With the Nissan, with the Sideways tyres, tight mount is better by 01.s, but equal with the sponge tyres.
With the Huracan, same performance with Sideways tyres, same lap time with tight and loose, but loose mount performance is better than tight with the sponge tyres, by 0.16s.
With the McLaren with both tyres types, the tight mount shows an improvement with their lap time. By 0.05s with the Sideways tyres and 0.14s with the Scaleauto tyres.
I've runned 5 times 10 laps, and it seems that the improvements, in all cases, are consistant.
So, I need to see how it works with other cars.

Overall, the Scaleauto procomp 4 tyres are a really nice surprise. I have to try the 11mm width version and maybe other compound.
I've very happy with this discover and plan to expand the test with others cars. Likely that this tryes are going to become my to-go tyres.

Ah, I've took a close shoot of the Scaleauto and the Sideways tyres:

View attachment 316773

The surface degradation is very obvious with the Sideways tire (right) than with the Scaleauto (left).
The good is that despite being narrower, the Scaleauto tyre perform the best, by far, on my track.
Happy man here!
Interesting findings, mmm, wonder how would they perform on a Ninco or Policar Track due to high degradation surface, if you happen to run a test with those tracks please report back , just as an academic experiment😉
Exactly, it’s just like when people want “post race”effects on their cars, just race them hard and you’ll get them free😉😅
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