Infraction Inexpensive 8S Speedrun Build

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Infraction Inexpensive 8S Speedrun Build

RedondoBeachRC

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Arrma RC's
  1. 4x4-Mega
  2. Felony
  3. Granite
  4. Infraction
  5. Limitless
  6. Kraton EXB
  7. Mojave
  8. Senton 3s
  9. Typhon 6s
  10. Typhon 3s
Acquired this V1 RTR on OfferUp. This will serve as the base for the build.
44D094CE-DFFB-4335-B28D-BF39FF5DDD28.jpeg

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E1C4FA32-967F-479E-BD76-CD4182C21F98.jpeg

Had a new Spektrum 160A 8S esc and 2050kv motor laying around, not in use. Perfect for this build. Side note: mounting tabs have to be trimmed is you’re putting this in the V1 or Limitless. The V2 Infraction or Felony have mounting holes for the 160A, so no need to trim the tabs.

A7A3CA6E-E46A-4342-BF8F-F01842C30F7D.jpeg

F0692028-3014-49E2-9F9D-9A7AB956A1ED.jpeg

V1 and V2 side by side for reference
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36BB6141-B31E-4891-9173-27F7CC250CB7.jpeg

Re-did the suspension following the tips given in Raz’s speedrun series (episode 5). Had some nitro tube on hand and some some pieces to length. Gonna try out some 3k cst diff fluid for the shocks. Stock weight is 2k cst, so just a bit stiffer.

16BC00C6-70DA-4863-9D71-0D68992D4323.jpeg

BE34A03D-8A4F-4FA2-8EE6-23BC7148ED8C.jpeg

Got everything wrapped up and took it to a parking lot. Ran pretty well, but the stiffness of the suspension had it bouncing like a bunny over bumps.. but perfect for smooth roads.

916E03BE-9E33-49BE-AB51-DA918D29B3D9.jpeg

38911DEE-6EAA-4E90-83C7-4F685AD9D51E.jpeg

Randomly I decided to take it out for its first official speedrun and it didn’t disappoint. Got a new all time PB of 107mph (172.2kph for those on the metric system) using 27/34 center gearing, 8S LiPo and Perfect Pass set to 7secs. Motor and ESC were still pretty cool to the touch after two back to back passes.

A336246E-0D98-4378-8D4D-3370457D69C3.jpeg

698D3789-E673-4FDB-BDD4-A8AF9DD805A8.png

Cost breakdown:
- $350 used RTR
- $180 motor/esc
- $60 spool
- $20 new sealed bearings
- $50 Perfect Pass
- $7 diff fluid
- $20 wires, bullets for esc

Total: $687

Can probably sale the old electronics that came with it for $100. Which will be bring the total cost under $600.

Not bad for a 100mph+ build that can perform pretty reliably.
 

SrC

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Real nice work on those rigs.(y)(y)(y)
Yea I scrutinized all of his build series. Raz's advice will get you into the 130's for sure. Space to run limiting.:)
If you study that video series and understand it all, any Speed Runner newb can get nice results. He left out nothing. It's's all there.
 
Last edited:

jondilly1974

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Arrma RC's
  1. Granite
  2. Infraction
  3. Kraton 6s
  4. Kraton EXB
  5. Senton 3s
  6. Typhon 6s
  7. Typhon 3s
Acquired this V1 RTR on OfferUp. This will serve as the base for the build.
View attachment 173060

View attachment 173061

View attachment 173062

Had a new Spektrum 160A 8S esc and 2050kv motor laying around, not in use. Perfect for this build. Side note: mounting tabs have to be trimmed is you’re putting this in the V1 or Limitless. The V2 Infraction or Felony have mounting holes for the 160A, so no need to trim the tabs.

View attachment 173065

View attachment 173063

V1 and V2 side by side for reference
View attachment 173064

View attachment 173066

Re-did the suspension following the tips given in Raz’s speedrun series (episode 5). Had some nitro tube on hand and some some pieces to length. Gonna try out some 3k cst diff fluid for the shocks. Stock weight is 2k cst, so just a bit stiffer.

View attachment 173067

View attachment 173068

Got everything wrapped up and took it to a parking lot. Ran pretty well, but the stiffness of the suspension had it bouncing like a bunny over bumps.. but perfect for smooth roads.

View attachment 173069

View attachment 173070

Randomly I decided to take it out for its first official speedrun and it didn’t disappoint. Got a new all time PB of 107mph (172.2kph for those on the metric system) using 27/34 center gearing, 8S LiPo and Perfect Pass set to 7secs. Motor and ESC were still pretty cool to the touch after two back to back passes.

View attachment 173071

View attachment 173072

Cost breakdown:
- $350 used RTR
- $180 motor/esc
- $60 spool
- $20 new sealed bearings
- $50 Perfect Pass
- $7 diff fluid
- $20 wires, bullets for esc

Total: $687

Can probably sale the old electronics that came with it for $100. Which will be bring the total cost under $600.

Not bad for a 100mph+ build that can perform pretty reliably.
Heck yeah brother 🤘🏻
 

RedondoBeachRC

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Messages
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Arrma RC's
  1. 4x4-Mega
  2. Felony
  3. Granite
  4. Infraction
  5. Limitless
  6. Kraton EXB
  7. Mojave
  8. Senton 3s
  9. Typhon 6s
  10. Typhon 3s
Gutting the Inexpensive Infraction build and moving some parts over to the limitless.

Gonna take this thing apart and inspect it more and then hit up my favorite part shop (Jenny’s RC) for some replacements.

Might even get some GP5 diffs for this one.

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