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Horatio's B7 Buggy

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Horatio

RCTalk Champion
Messages
210
Reaction score
823
Points
240
Location
Carmarthen
RC Driving Style
  1. Bashing
  2. Racing
  3. Flying
Initially, I got hold of the B7 Team which had been setup by a sponsored, local driver.

I bought the car as a slider and planned on getting my nephew racing with it.

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It sat like this on the 'to do' list, ahead of the SWRCCC 25/26 Winter Champs.

Long story short, our young driver is not quite ready for buggy and is now in possession of a Tamiya TT01 which he loves and is better suited to a 6 year old pilot! 😅

So, should I race a second class with it? Yes, totally!

So, it was time to look at what needed attention. The rig was mint to be fair. Nothing bent or broken. There were a couple of missing parts - like the rear anti-rollbar mount, but otherwise good.

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Upgraded rear ballraced anti-rollbar mount. Carbon rear arms.

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Build was getting there, but the gearbox was needing some TLC.

Out it came - Willspeed idlers went in. This hugely improved the smoothness of the gears.

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At this point I noticed there was an issue with the motor mount. I was also gobsmacked that a buggy would mount a motor in this manner - hanging on for dear live from the bottom of the mount, made from unknown material and obviously far from being immune from bending. Hopeless for gear mesh and durability. It had to go!

R1 Wurks Carbon mount was ordered up.

Along with a Vision Racing Std length Carbon Chassis. 🤩😝

Electronics selected for mod racing was the HW XR10 G3 Pro and 5.5T motor, which has already proven entertaining and formidable in my 4WD buggy. 👌

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Super straight. Super light. Super rigid. Perfect for carpet - don't let anyone convince you otherwise.

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Now we're beginning to get there....
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Weight was improving - but there was still room for improvement.

That being said, this is how I raced it for a couple of meetings. Compared to the previous chassis and gearbox - this was definitely smoother and the rig was lighter and carried more speed through the corners.

I was racing 2WD for the first time in 20 years and loving it. Getting within 1 lap of my 4WD TQ and qualifying 2nd overall for 2:rounds.

More improvements....

I don't like rubber bands for battery mounting - so I used these....

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More strategic use of titanium and fitting of the new 3 gear conversion....

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New gearbox has less drag, less rotating mass and I fitted with ceramic bearings. Motor position is the same as the 5 gear from what I can tell.

Titanium axles....

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Jconcepts finned Titanium turnbuckles....

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Vs the stock steel items - these savings quickly add up.
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As there are 6 of them, so I conclude that it's a sound investment for both durability, lightness and eye candy. 🤩

Ceramic hybrid bearings were used throughout.

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These are super free spinning, are lighter, reduce parasitic drag and are pretty much rust proof.

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Now we're cooking on gas. This is a formidable racing machine now.

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Now we're having to be careful for sanctioned races. This is nearly done - some more titanium to fit and this rig is maxed out!

So - how does it race?........
 
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Not every upgrade is visible. Like these R1 Wurks low profile upper shock mounts....

But they save significant weight from high up, helping to lower CoG.

Another whopping 2g saved! 🤭

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Race day....

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The B7 has a precise, agile handling and I can thread the eye of the needle with - like here where I pick a line through lapped traffic with zero room for error.

Landing off jumps is plush with the 13mm shocks, even when running at very low ride heights...

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It's also Xray team driver proof! 😝 Despite rubbing wheels - neither buggy crashed as I yielded at the next jump. This part of the track was not a place where my B7 could be passed without attempting to go through my buggy! 😅

You can see my race here:

Qualified 3rd - finished 3rd, although I was in 2nd place for 25 laps - taken out by a back marker in the last 10 seconds....🤬

 
Nice!
That battle at the 3min mark was great and then avoiding the back marker who stopped just off line, nice moves. It looked like a ginsu out there.
It was a great race - filmed by car 8. His wide angle headcam caught about 50% of my race.

I was super pleased with the car - and 2nd for 99% of the race was better than my peers predicted. 😎

The modified B7 is definitely lapping faster - within 0.4 seconds of my 4WD in fact.
 
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I was so, so close to getting 27 laps with it. But consistency was 97% which I am very happy with.

For comparison, here's my 22X-4 Elite times...

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There's really not much in it, yes it's faster - but it's also harder to drive - which is counter-intuitive to everything I thought I knew about 2WD Vs 4WD buggy racing.

The reason? Carpet. Put buggies onto carpet and give them all the traction and suddenly most of the advantages of a 4WD system are nullified.

2WD is lighter, uses less battery and definitely can be very, very fast.

I'll check data logs in a bit and see what sort of speeds it was going with the 5.5t, but last race it hit 43mph, whilst my 22X-4 was pushing 46mph.

I suspect there's less of a difference this round. 😅😎
 
Kong Vs Zilla.

Ford Vs Chevy.

Liverpool Vs Manchester United.

We love to compare stuff. So I'm going to directly compare 2 RC giants,

RC10 B7 Team
V
TLR 22X-4 Elite

During race conditions, same driver, same cells.

B7 using 5.5t - 20t pinion, 27.00mm/rev

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47490 rpm = 46mph

22X-4 Elite using 4.5T, 18t pinion, 23.74mm/rev

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50410 rpm = 45mph

So there we have it. For the first time, my 22X-4 is not faster in a straight line than my B7, despite using a 4.5t motor.

Following these upgrades on the B7, the car is finding an extra 3mph on the straight and carrying more of that speed through the corners.

New tyres for both rigs next round may yield different results also.

Track design for Round 4 on the 22nd February:

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Curious to see the results after fresh tires are added to the mix. 🤔 l don't race but this is still interesting. :thumbs-up:
Being thrifty (and fairly easy going on my tyres) - I can find use for each set of tyres over about 3 meetings, then they're just not really up to anything more than just hooning around.

When the tyres are optimal, I can pick a perfect line onto the straight and can hold 100% throttle just that little bit longer. 🤩

Either way - this is the fastest I've recorded my B7 during a meeting.

It's a ridiculous speed for an RC car indoors. This is why it's awesome! 🤩😝
 
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