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BillDeLong's Avatar
"Did I make the A Main?"
BillDeLong - 11.02.15, 8:36 pm Post #1: | Reply With Quote
This is arguably the car that made the SCT class popular when it was first introduced in 2008:
https://en.wikipedia.org/wiki/Traxxas#Slash_Trucks

Although the 2WD SCT Class has evolved significantly with far superior designs using modern technology from dozens of manufactures across the globe, there is still a relatively strong cultural following for those dedicated specifically to the "Spec Slash Class" and that's what this thread will be dedicated to supporting in regards to the rules observed by my local race track:
Thornhill Spec Slash Rules
OCRC Spec Slash Rules

Here we are, nearly 8 years later (at the time of this writing) and there is still a strong interest in offering a "gateway class" to merge novice in with intermediate (sportsman) drivers. I will expand on the information shared in the following link which I feel is an excellent starting point in preparing a Slash for the race track:*** I'm far from the best driver in my area, but every now and then I have a particularly good race day and have had really good results with this setup

Additional Tuning Tips:
  • Apply comm drops once at the beginning of each race day, this will help keep your commutator clean and soften your brushes to help keep them properly formed, more motor tuning info here: http://www.rcracingusa.net/electricmotor.htm
  • To help reduce weight and improve connectivity (reduce resistance) I would remove all the connectors from the ESC to motor and battery doing a direct solder on the wires to the motor and use in-line 4mm bullets to the battery
  • I highly recommend using a shorty LiPo with the pack farthest to the rear as possible in the tray as a weight distribution option to help get max rear traction to improve corner speed, there are even newer LCG packs available to further reduce weight; I recommend buying the highest C rating that you can reasonably afford, I'm currently racing with Lectron Pro 100C-4.6Ah
  • I'm using a very light coat of Green Grease on my planetary gears of the diff and also apply a thick coat of green grease on all my shock o-rings; in order to get super smooth shock action, I work the pistons back and forth (dry) in the shock body until they move free/smooth and then pack the cartridge a little loose, if I tighten the cap on the shock shaft too much then the shaft will bind with the o-rings. Once I get the perfect setting then I apply a thin bead of CA glue along the threads to lock the cap in place. When I need to service the cartridge in the future, I simply soak the shocks in acetone over night to dissolve the CA glue and the cartridge caps will twist right off the next day
  • Aluminum shock caps on the front shocks are a must, the stock plastic caps tend to pop off far too easily
  • I highly recommend replacing the stock servo with a fast low profile servo with titanium gears, I'm having good luck with the Turnigy 1251 servo, however it was necessary to Dremel away the lip of the servo mount in order to get it to fit properly
  • I highly recommend replacing the stock radio system with any computer system that offers exponential steering/throttle rates. I feel that the current best budget radio on the planet is the Radiolink RC3S, but I'm currently racing with a KO Propo EX-1
  • Before every round of racing, I spray an even coat of Liquid Wrench (Blue L212) Lubricating Oil on the rear tires to help soften the rubber and improve rear traction. It typically dries in about 20-30 minutes, but if there is any residue before your race, then I would hit the tires with some compressed air to quickly dry them off before your race to get the best results



***

If you are racing in an Open 2WD Mod SC class, then here's the list of things I would personally consider upgrading:

1) LCG Chassis

2) Aluminum shocks from any reputable 2WD SC kit with threaded collars, something like these should also do fine for a tight budget: http://www.ebay.com/itm/HD-Aluminum-...3D231901055507

3) Copy a race setup sheet based on a track with similar conditions, there are no pro drivers currently running the Slash, so pick any competitive brand that suits your taste, I'm a little partial to Losi: http://site.petitrc.com/setup/losi/S...ntyTwoSCT.html

4) Buy the same tire/compound that the fastest driver at your track is running

5) Any radio with expo steering rates is a must, I'd start with -50% expo, decent selection of radios to consider here: http://www.ultimaterc.com/forums/sho....php?p=2153402

I'm currently racing with this system and have been very happy with it: http://www.ultimaterc.com/forums/sho....php?p=2354993

6) Any fast servo is a must, I'm currently running a Turnigy 1251: http://www.ultimaterc.com/forums/sho....php?p=2326343

7) Any 100C LiPo as sub shorty, I'm currently running this pack: http://www.yourbatterybuddy.com/inde...lipo-pack.html

8) Any 7.5T combo will do, perhaps a 10.5T motor might be more suitable for indoor tracks. If I were to race in open mod, I'd go with this ESC here:http://www.banggood.com/SKYRC-TORO-T...166379201304IO

And this 10.5T motor here: http://www.banggood.com/ROCKET-540-B...166379201304IO

More general information here that might be useful for a novice racer:
http://www.ultimaterc.com/forums/sho....php?p=1953528
http://www.ultimaterc.com/forums/sho....php?p=2295675
http://www.ultimaterc.com/forums/sho....php?p=1976019

Good Luck!
(Last edited by BillDeLong : 6.24.17 at 8:27 am)
eTruggy + eBuggy + 4WD Mod SC + 4WD Mod ST + 2WD Mod ST + 4WD 13.5T Buggy + 2WD 17.5T Buggy + Spec Slash
BillDeLong's Avatar
"Did I make the A Main?"
BillDeLong - 11.02.15, 9:05 pm Post #2: | Reply With Quote
The track in my area doesn't allow any performance enhancing modifications, but they do allow minor durability upgrades so long as it doesn't improve performance. I already mentioned the need for aluminum shock caps earlier, but some folks have also invested in aluminum hub carriers too... they tend to snap when landing from big jumps at odd angles.

What I've been experiencing a bigger problem lately has been the front upper shock screws tending to back out during the middle of a race. Even if I apply some CA, they still tend to back out

I've decided to experiment with threading a 3x30mm screw through the back of the shock tower/ body mount backed with a couple #8 washers, then a shock bushing backed with a M3 lock nut, fingers crossed this resolves the problem so I don't have to worry about losing a shock during a race again



(Last edited by BillDeLong : 11.02.15 at 9:22 pm)
eTruggy + eBuggy + 4WD Mod SC + 4WD Mod ST + 2WD Mod ST + 4WD 13.5T Buggy + 2WD 17.5T Buggy + Spec Slash
gillbily23's Avatar
"USMC (Ret)"
gillbily23 - 11.11.15, 7:36 am Post #3: | Reply With Quote
Subbed. I had dumped all my Slash stuff after not seeing any interest in it the last couple years overseas and sure enough I move to Indy and there are nothing but stock Slash spec races. We even have a local track that runs stock Slash modified car oval races so I have picked up a Robby Gordon 2wd Slash for the stock SCT racing and am working on getting another stock Slash with a modified body for oval racing. The local rules are only a couple RPM upgrades, Traxxas spring adjustments, any gearing combination, Traxxas Slash wheels and tires, any tx/rx combo, and stock electronics other than battery. I will try to contribute a little once I get the truck on the track but thanks for gathering all the information already for a great starting point.
Hmmm, what should we do today? Shall we go drifting, crawling, short course racing, mudding, rock racing, road racing, trailing, or just run them as fast as we can around the baseball field and create a dust storm?
BillDeLong's Avatar
"Did I make the A Main?"
BillDeLong - 11.15.15, 9:35 am Post #4: | Reply With Quote
Glad to hear of more Spec Slash racing out there, sounds like your track is a little more liberal with the rules than mine.

I had another good race day yesterday, while comparing my results from the last time I raced, I got the same number of laps but was able to get a faster fast lap time, and that was with poor track conditions too! Earlier in the day I was able to pull some 18.0 second laps before. My shock tower repair held up nicely and didn't have to fuss with my shock screws once yesterday

My next goal is to make a sub 18 sec lap before they change the track layout for the upcoming ROAR Regionals in December!
eTruggy + eBuggy + 4WD Mod SC + 4WD Mod ST + 2WD Mod ST + 4WD 13.5T Buggy + 2WD 17.5T Buggy + Spec Slash
Rodarbal's Avatar
"In the mirror you'll see a dog"
Rodarbal - 11.16.15, 8:56 pm Post #5: | Reply With Quote
Bill your Spec Slash is starting to embarrass my ol' B4.1 blinky buggy. Lol

Spec Slash is a riot on our current layout. It's a blast at Indy in Dallas, too, but they run open gearing.
RJ Labrador
On Road: Tamiya & XRay
Off Road 1/10: Losi & XRay
Off Road 1/8: Mugen
BillDeLong's Avatar
"Did I make the A Main?"
BillDeLong - 11.17.15, 7:39 am Post #6: | Reply With Quote
LOL... sadly my Spec Slash has been turning comparable lap times with my 4WD SC... not sure what the deal is there... I guess I'm better suited for Spec Racing than open mod, go figure???

Open Gearing??? Not to sure I like that idea, I recall seeing lots of motors get burned up at the ClayPit when they had open gearing in the Spec SC class there, I've grown to appreciate having a 90% Spec Class
eTruggy + eBuggy + 4WD Mod SC + 4WD Mod ST + 2WD Mod ST + 4WD 13.5T Buggy + 2WD 17.5T Buggy + Spec Slash
Rodarbal's Avatar
"In the mirror you'll see a dog"
Rodarbal - 11.17.15, 8:16 am Post #7: | Reply With Quote
The Indy track has the benefit of having several Traxxas engineers racing with them. Traxxas is backing up their program. They can get new Titan 12T motors for $10 when they turn in a burned up unit.

I, too, am not a fan of open gearing. Whether it's $10 or $20, I don't like the idea of plowing through motors for the sake of competition.
(Last edited by Rodarbal : 12.09.15 at 2:50 pm)
RJ Labrador
On Road: Tamiya & XRay
Off Road 1/10: Losi & XRay
Off Road 1/8: Mugen
BillDeLong's Avatar
"Did I make the A Main?"
BillDeLong - 12.05.15, 12:53 pm Post #8: | Reply With Quote
I think I have about 4-5 race days with this car and it's been doing really well for me. I was kind of surprised to see the shock fluid already this dirty, see the clear tray on the left filled with fluid from all 4 shocks. I also didn't realize it but both rear shock shafts were slightly bent. It wasn't enough of a bend to make out on camera nor enough bend to effect the friction on the pistons inside the shocks, but certainly enough for me to want to replace them. I'm much happier with the rebuilt shocks now and it's time to clean/inspect all the bearings... good times

eTruggy + eBuggy + 4WD Mod SC + 4WD Mod ST + 2WD Mod ST + 4WD 13.5T Buggy + 2WD 17.5T Buggy + Spec Slash
BillDeLong's Avatar
"Did I make the A Main?"
BillDeLong - 12.08.15, 8:52 pm Post #9: | Reply With Quote
So I recently did a trade for another Slash, and it has turned into quite a project as the previous owner had swapped out far more parts than I bargained for with aftermarket upgrades and I had to sink an additional $60 worth of stock parts to get it back into box stock form. I found it necessary to painstakingly go through the following exploded parts to make sure all the right length screws were in place and ordered all the correct bits needed:

Slash Exploded Parts Diagrams


I'll soon have a spare loaner/rental available
eTruggy + eBuggy + 4WD Mod SC + 4WD Mod ST + 2WD Mod ST + 4WD 13.5T Buggy + 2WD 17.5T Buggy + Spec Slash
Abomb's Avatar
"Experienced user"
Abomb - 1.07.16, 7:55 pm Post #10: | Reply With Quote
We're doing a stock slash class this year, both oval and off road. Seeing as we will have Sat. off road, and Sunday oval races, I'm hoping to stumble across a setup that works reasonably well for both...with both me and my 11 year old racing 2 classes at both tracks, I really don't want to be completely changing a setup on two cars Saturday nights...

Here's my $30 garage sale Slash on our oval track last fall....It's the one with the 55 chevy body, and my 11 year old son is doing the driving.

https://www.youtube.com/watch?v=_tbjYTulZkY
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