INVADER - Nitro Slash drag car

Welcome to RCTalk

Come join other RC enthusiasts! You'll be able to discuss, share and private message with other members of our community.

johnnydmd

RCNT Talkaholic
Messages
235
Well, I fired it up last night, man that is one nasty, mean sounding engine :D I shoulda taken a video, I will next time. I can tell right away just by a couple of very light throttle blips, that this thing is packed with power.

Had a little trouble at first due to a faulty glow plug, but once I put in a good one, it started easily. Not sure I mentioned the mechanism, but I used a Redcat rotostarter, and rigged up a Traxxas Easy-Start connector to attach to the wheelie bar with just the plug wire and ground to use a Traxxas starter wand to heat the plug. Since the body doesn't have an opening to stick anything on the plug when the body is on, this was a necessity. Works really well. I ran about a tank idling lightly, few very slight throttle blips.

The only other issue I had was with the Hot Racing 3 shoe clutch. There are 3 little washers that go under shoes, but what I noticed is that with them there it makes the shoes slightly higher than the posts on the flywheel, which in turn push the shoes into the clutch bell a little, causing the clutch to drag pretty bad making the car creep a lot. I suppose the washers to keep the shoes from touching the flywheel when they flip outward, but really this seems a little unnecessary to me, and so I removed them and re-tested. Much, much better. Gotta say, that clutch is really, really nice when working correctly. I will probably get a few of them and drill the shoes out to test higher rpm slams.

Oh, and I found aluminum beadlock rims for the front that match the Mickey Thompson rear beadlocks very nicely! (Vanquish makes them).
 
Last edited:

johnnydmd

RCNT Talkaholic
Messages
235
Full parts list and price breakdown. Though I had free shipping on quite a few items, I'm sure it added a few hundred extra to the total....kind a got a little queasy adding this up, but it's only a little more than expected...and totally worth it :)

Integy steel drive shafts 40.00

Traxxas Screw set 14.00

Big bore aluminum Shocks 40.00

Traxxas 2055 Servos (2) 44.00

Traxxas Slipper clutch and spur gear – 20.00

Traxxas Fuel tank – 8.00

Traxxas fuel tank holder – 6.00

Traxxas upper chassis plate – 10.00

Traxxas receiver box – 3.00

GPM Servo arm and linkage – 15.00

Hot Racing X shaped alloy servo arm – 9.00

Traxxas turnbuckles – 22.00

Integy full suspension kit – 140.00

Integy front bulk head – 22.00

Traxxas gearbox – 12.00

Integy alloy Gear case – 20.00

Hot Racing 3 shoe clutch and flywheel – 38.00

Traxxas Throttle and brake linkage – 9.00

STRC steering bell cranks - 16.00

Traxxas Suspension pin set – 6.00

Xtreme Racing CF chassis plate – 90.00

STRC engine mount – 19.00

Integy body mounts front and rear – 60.00

Integy rear suspension mounts 20.00

Ball Bearing kit - 14.00

Integy hubs/nuts 12mm - 15.00

Venom hump pack – 20.00

FlySky Radio and Receiver – 40.00

O.S. .21 Engine – 280.00

THS Tuned Pipe – 55.00

Pro Line Hoosier Drag slicks – 29.00

Mickey Thompson bead lock rear wheels – 60.00

Pro Line Hoosier front tires – 22.00

Vanquish bead lock front wheels – 65.00

STRC Wheelie bar – 30.00

Parma 55 Chevy Body – 41.00

Pro Line Headlights – 25.00

PETG .60 sheet 24x18 – 10.00

30 small sheet metal screws – 2.00

Dubro green nitro fuel line – 3.00

Nitro exhaust deflector – 5.00

Traxxas EZ Start harness – 5.00

RB Innovations air filter – 30.00

RPM Zoomies – 9.00

LOSI 2 pin connector – 1.00

Total – 1442.00
 

Rolex

Hoof Hearted
Staff member
Supporter
Military Veteran
Messages
35,039
Location
In my recliner
RC Driving Style
Bashing, Flying
That's quite a parts list. Keep us posted on the progress.
 

johnnydmd

RCNT Talkaholic
Messages
235
I can tell this thing is gonna be snappy :) Just barely touch the throttle, this thing revs fassssst. I also put on the Vanquish OFM Outlaws(one, lol). I thought I was ordering "pairs", turns out it was parts for one. Then I went to order the other, and there were out of the center clamp rings! Doh! Scoured the net and couldn't find any. I kinda was resigned to either waiting for them to make more, or ditching the idea altogether. I was a little concerned about the weight, the wheels were around 90 grams alone. Then I got to thinking...why not 3d print the center ring? My Mickey Thompson's on the rear have a plastic center ring, presumably to save weight(and it's totally inside where you cannot see it, so I did the measurements, made the model in Meshmixer, and printed it out. That original ring was 40 grams of the weight, so good opportunity to make the weight a bit more reasonable. Worked like a champ :)

 
Last edited:

johnnydmd

RCNT Talkaholic
Messages
235
Sounds like she is gonna be smoking fast.
Yeah, it feels ridiculously strong and responsive. Can't wait to get it broken in, weather isn't cooperating much here ;) It's definitely got a meaner, snarlier sound than any motor I've had previously.
 

Tunedpipe

RCNT Addict
Supporter
Military Veteran
Messages
790
Location
Somewhere.
RC Driving Style
Bashing
I bought a Tornado s30 nitro 3 months ago just for a mod platform and I have yet to break it in because of weather. I don't want to break it in and then have it sit for another 3 months so I'll wait.
 

johnnydmd

RCNT Talkaholic
Messages
235
Construction is finally 100% done(at least until testing). The last piece of the puzzle was the front wheels, which I finally got the second one delivered and was able to put together last night. I compared the weight of the Proline Pomona rims, and adding the Vanquish rims with the clamp ring being 3d printed wound up being a net weight gain of .25 lbs(120g). I can live with that, and the total is now at 6.6lbs, still a pretty light vehicle given the power output of the OS .21tm. The additional weight is a decent trade off for how much tighter and precise the Vanquish wheels are. Man those Pomona's had some real slop in them.

120338


Have to wait a bit to finish breaking in the engine, it was only 21 degrees this morning :O I really am pretty anxious to start doing test runs, and tuning/modding the clutch and gearing.
 

johnnydmd

RCNT Talkaholic
Messages
235
Got a chance to burn two tanks this weekend while it was 50 degrees out :) That weather didn't last unfortunately, now it's back to 30 and snowing, lol. Still running at factory needle settings and being very ginger with it. Ran with the lid on too keep the heat in. Might insulate with foil and run some if it doesn't warm back up. Couple of little half-throttle blips on the third tank from a stop, and the rear slicks easily broke loose. Power to weight looks pretty good, and just a guess, but likely I'll be changing the bell and spur gears out to get more top end. Bottom end is really strong with the 72/20 setup. 65/24 might be where I need to be. Pretty sure I'm going to drill out my clutch shoes too, but won't know until more testing is done.

Just for fun I did a build sheet for an "express" version of this car. Using stock chassis/arms/towers/bulkheads/steering/servo arms/linkages, but still a beefed up drive train and rear wheels. Engine would be Dynamite .19, and front rims would be the ProLine Pomona's. 875 was the final tally for that version, so would have been quite a bit cheaper.

Once this thing is broken in and I start tuning for real, I'll post some vids of runs, and hopefully the ET's are where I expect them to be.
 

johnnydmd

RCNT Talkaholic
Messages
235
Little while since an update, but I've been toying with this thing the past couple of weeks nonetheless. I didn't get a chance to record a video, but will soon once I have it where I want.

I got the engine about 3/4 the way broken in, but haven't messed with the needles just yet. My next outing I will start dialing it in some. First I had to fix a couple of glaring problems.

The first problem is that the 3d printed attachment for the wheelie bar was just not stiff enough, far too much flex. Even with my rich settings, launching the car(tested at half throttle), the front wheels came way up(when it actually got traction). So I started thinking of ways to brace it, and came up with using Jato turnbuckles and a strip of .60 PETG mounted to some handy existing screwholes in the shock tower.

120557


120558


The second problem is traction loss. I was testing on my parents driveway while visiting them, which is probably a little smoother than typical no-prep road/parking lot surfaces(it's sealed blacktop). After launching, I gunned it briefly, and it spun out of control. Nearly hit my mother's car!

I'm running 72/20 gearing, with an unmodified hot racing 3 shoe clutch. Given that the stock Nitro Slash runs 50-55 mph top speed with 18/72, I'm thinking that I should be around 60+, which is probably plenty to compete in typical no-prep SE classes, or Pro Mod RCDRL rules, but I'm thinking of switching up to 65/24 gearing, and either lighting my shoes by drilling them out, or trying to find a clutch system with different spring choices. I know Reds makes a fantastic clutch, but it's 1/8 scale. I'm guessing a 1/8 clutch and bell isn't gonna work. Anybody know, or ever tried? Or are those clutches the same size? Bottom line is, if I gear this thing up, I think I need to tune the clutch to hit at higher rpms to prevent bog and get up further in the power curve. That gearing should add quite a bit of top end I think, and still have tons of power.

Speaking of which, does anyone really know the hp of the O.S. .21? I know the .18tz was dyno tested at 2.4 back in the day. I wonder if the .21 is pushing 3? Feels vastly stronger than a TRX 3.3(saw that tested at like .97 hp), and the Dynamite .19(which is rated at 1.7 I think).
 

cbaker65

Hardcore RCNT User
Messages
3,792
Location
Kern county ,Calif.
I think that it is best if you wait until your engine is fine tuned to leaner conditions before you start changing the clutch shoes!

The fine tune of the engine will effect the way that it takes off from dead still to full WOT on the starting line ,if you just start
making sudden changes now ,it will only confuse you!

Yea ,you can change the timing of the clutch ,but ,I would also look into a good slipper spur ,allowing the slipper to slip a
little will help on take offs!
 

johnnydmd

RCNT Talkaholic
Messages
235
I just have the stock slipper currently, which is the one with the little plastic pegs. Are there some better options out there? I see some ones with actual pads, etc, but not sure they will work.
 

cbaker65

Hardcore RCNT User
Messages
3,792
Location
Kern county ,Calif.
I just have the stock slipper currently, which is the one with the little plastic pegs. Are there some better options out there? I see some ones with actual pads, etc, but not sure they will work.
The friction style does burn out faster ,the Mgt trucks uses those as well ,at one point ,I was modifying my spurs gears an drilling
the peg holes out a little to install ball bearings in there place ,it caused the gear to wobble around ,so when I touched the gear
with my fingers ,the gear would move from side to side ,but it never did effect the runs like that ,to me ,it actually helped shed
any debris off of it like little pebbles!....:cool:

My spur gear mod!





 

johnnydmd

RCNT Talkaholic
Messages
235
How does that work with the ball bearings? Wouldn't the disks spin on the bearings?

I've got this thing broken in, and am starting to tune. Gradually leaning int out, it's still pretty rich. I have to do something about the brakes, they just don't work all that well, tried some adjustments to no avail. Bad enough that twice I tapped into a curb at low speed, but enough speed to wreck my steering servo(no servo saver, or front bumper for that matter on this).

Definitely have to do some suspension tuning as well. The wheelie bar mod is working great though, but when I gun it the right rear wheel tends to lift up pretty hard and make the car spin to the left quite a bit. So I am thinking the shocks need to be adjusted to be a bit stiffer...gobs of insane power though! I can easily brake the tires free even when moving 10-20 mph. Can't wait to race this against some of the local 2s electric guys who think nitro isn't fast enough :D:D Just a couple of test runs of 132 feet and timing in my head, I can already see that this thing can fly. Still need to do a full top speed run to decide if I want to change gearing, but I might actually be ok with the 20/72 set up.
 

cbaker65

Hardcore RCNT User
Messages
3,792
Location
Kern county ,Calif.
How does that work with the ball bearings? Wouldn't the disks spin on the bearings?

I've got this thing broken in, and am starting to tune. Gradually leaning int out, it's still pretty rich. I have to do something about the brakes, they just don't work all that well, tried some adjustments to no avail. Bad enough that twice I tapped into a curb at low speed, but enough speed to wreck my steering servo(no servo saver, or front bumper for that matter on this).

Definitely have to do some suspension tuning as well. The wheelie bar mod is working great though, but when I gun it the right rear wheel tends to lift up pretty hard and make the car spin to the left quite a bit. So I am thinking the shocks need to be adjusted to be a bit stiffer...gobs of insane power though! I can easily brake the tires free even when moving 10-20 mph. Can't wait to race this against some of the local 2s electric guys who think nitro isn't fast enough :D:D Just a couple of test runs of 132 feet and timing in my head, I can already see that this thing can fly. Still need to do a full top speed run to decide if I want to change gearing, but I might actually be ok with the 20/72 set up.
That spur set up is like what is in most rear trans on 2wd models an the way they work ,most trans. are set up on a bunch
of bearings inside of a gear an a thrust screw runs through the out drive cups to tighten the pressure ,in which allows a
certain amount of slippage ,the slippage helps save the gears on torque loads an during rough terrain & jumps that is
hard on the gears!
 

DakRatFink

RCNT Rookie
Active Military
Messages
17
I’m loving the updates on this build. You can probably tell from my screen name I Love Big Daddy Roth and Kustom Kulture hot rods. Your craftsmanship is superb and I love seeing your imagination come to life in the form of a wicked gasser. If I ever decide to build a Slash Drag car I’d like to do a Willy’s style gasser I’m going to have check out your T Maxx build. I have a T Maxx but mine is stock. Still a fun rig though .
 

Create an account or login to comment

You must be a member in order to leave a comment

Create account

Create an account on our community. It's easy!

Log in

Already have an account? Log in here.

Thread starter Similar threads Forum Replies Date
S Duratrax Invader Electric RC 4
J Traxxas nitro rustler transmission problem Chassis & Drivetrain 1
J Different nitro fuel and overheating Nitro RC 9
hartleyd21 Electric vs Nitro General Chaos 8
jlobbia Need help identifying associated nitro short course truck Nitro RC 3
jlobbia Check out my YouTube for Nitro RC action! Nitro RC 0
S Please help identify nitro buggy Nitro RC 5
Simonh080 Need help with my hyper 7 nitro Nitro RC 19
jlobbia What is the biggest nitro engine ever built on a monster truck? Nitro RC 1
G Kyosho inferno neo 3.0 nitro engine help Engines 4
hoopdoggy I need help with my nitro HPI rs4 mt Stadium Trucks 30
P Nitro Hawk - 3110 Nitro RC 7
MoNitro Reviving my Nitro RC's Nitro RC 4
Z Need help identifying this nitro engine! Engines 10
K Nitro car not moving Nitro RC 31
S Nitro rc fuel Nitro RC 5
jlobbia 1/16 Nitro??? Nitro RC 10
jlobbia How do i hook up a RF7G to my nitro? Nitro RC 2
G Hpi rs4 nitro viper 4wd staggered wheels possible? Chassis & Drivetrain 4
Connor_TK.Extra Need help with parts for my nitro HSP bug crush RC car Nitro RC 15
W Dug out my old Nitro buggy, need help, it's been so long! Nitro RC 1
brownbread Kyosho Nitro Tracker stuttering second gear Nitro RC 6
NurturantQuasar What are some Reliable nitro rc cars? Nitro RC 6
Tivum Can you start a nitro with a car battery? Nitro RC 7
N Need help identifying this nitro car Nitro RC 5
L Please help me identify my nitro car Nitro RC 11
drivinggun Want/Need Camera with sound to mount to my Nitro Reviews, How-to, & Guides 4
I Nitro to electric conversion questions Electric RC 14
G Nitro engine priming and starting difficulties (needs help) Nitro RC 27
F Nitro motor stuck RC Aircraft 0
Z Schumacher Nitro Help Nitro RC 8
W Advice on a Nitro MT Nitro RC 8
H What's new in nitro engines? Engines 2
Reeves9277 Nitro none start Nitro RC 4
Berlinetta95 Does anyone live near the Dallas,Texas area with on road nitro rc car? Nitro RC 1
H Hpi Super nitro build Nitro RC 2
B Lexan shell for nitro airway question(s) Nitro RC 5
Striikar Nitro ID & $? Nitro RC 6
DirtyMonkey318 Looking for help idenifying this nitro Nitro RC 3
J New Nitro engine Nitro RC 10
robertlow E-flite PA-20 Pacer 10 Nitro conversion? RC Aircraft 0
N Fuel won't flow and can't prime NITRO BUGGY HELP Nitro RC 4
Camarolover2005 Throttle servos randomly broke on my HSP nitro car Electronics 5
D Identifying nitro truck Nitro RC 24
Rubendb The best 1/10 scale nitro engine Engines 47
>BD Show me your vintage nitro RCs. Nitro RC 1
M HELP!! me build my first brushless(ARMA Limitless) for a NITRO FaN Electric RC 10
C Hello in need of some help nitro rc upgrade Nitro RC 38
R/C Ambassador Winter time nitro fun. Nitro RC 4
Chris_205 Nitro exhaust outlets orientation? Nitro RC 3
Similar threads


















































Top