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Tamiya TB Evo 8

Old 11-22-2022, 04:55 AM
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Originally Posted by zuqbu
Progress after parts bag B:


The one-piece aluminum diff housings are a work of art. Machined with precision and stunning quality, and so satisfying to assemble. I donít want to know what they will cost as spares
Congrats on your purchase. Looks fantastic. I have a question: What is the overall width of the chassis? Thanks c'',)
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Old 11-22-2022, 11:08 AM
  #77  
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Originally Posted by Eotz
Very nice car. Just a question. How much does that car weigh? Those bulkheads looks massive.




Originally Posted by IAmGreatDane
Congrats on your purchase. Looks fantastic. I have a question: What is the overall width of the chassis? Thanks c'',)
Tamiya states 186mm track width. Or do you mean the lower chassis plate? That would be 88mm.
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Old 11-22-2022, 02:07 PM
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Wow- if that is reading 679g that’s 40 grams heavier than the evo7 I have as a beautiful shelf queen! Was too heavy! Would be interested in a review In performance against something like a TRF420. Only chance of being near class weight is with a shorty pack.

or is the weight 619 g on that scale above?
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Old 11-22-2022, 02:27 PM
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Originally Posted by minidriver
Wow- if that is reading 679g thatís 40 grams heavier than the evo7 I have as a beautiful shelf queen! Was too heavy! Would be interested in a review In performance against something like a TRF420. Only chance of being near class weight is with a shorty pack.

or is the weight 619 g on that scale above?
Itís 619 g Ė sorry for the picture quality.
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Old 11-22-2022, 09:29 PM
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Originally Posted by zuqbu





Tamiya states 186mm track width. Or do you mean the lower chassis plate? That would be 88mm.
The chassisplate. Sorry, I wasn't specific in my request. Thanks. Much appreciated.
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Old 11-23-2022, 01:00 AM
  #81  
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Quick note: After assembling I noticed some binding in the rear gearbox, I added a 0,1mm shim in step 6 as pictured here – that eliminated some play that could push the bevel gear into the differential.


Another potential source for binding are the polycarbonate dust covers – they can touch the diff housing in the rear. I made a small cutout on that side.
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Last edited by zuqbu; 11-23-2022 at 02:00 AM.
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Old 11-23-2022, 02:11 PM
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minidriver we need you to come out to the TCS race in Maryland in Feb.
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Old 11-23-2022, 09:46 PM
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Originally Posted by minidriver
Wow- if that is reading 679g thatís 40 grams heavier than the evo7 I have as a beautiful shelf queen! Was too heavy! Would be interested in a review In performance against something like a TRF420. Only chance of being near class weight is with a shorty pack.

or is the weight 619 g on that scale above?
619g is still 70g heavier than most other shaftdrive cars...Lots of heavy aluminum parts on the tb evo8...
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Old 11-26-2022, 08:32 PM
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Originally Posted by zuqbu
Progress after parts bag B:


The one-piece aluminum diff housings are a work of art. Machined with precision and stunning quality, and so satisfying to assemble. I donít want to know what they will cost as spares
Nice looking chassis! Is there any loss of longitudinal rigidity around the spur gear? I'm asking as I've noticed that the supports that are on either side of the spur gear is not bridged by a top cap (like on the Evo7) and it seems that it's either the chassis plate or the spur shaft to resist longitudinal flex around that zone. Although the Evo7 also has this discontinuity lengthwise, they're located close to gearbox area where the effects of bending are less significant.
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Old 11-28-2022, 01:53 AM
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Originally Posted by rc_square24
Nice looking chassis! Is there any loss of longitudinal rigidity around the spur gear? I'm asking as I've noticed that the supports that are on either side of the spur gear is not bridged by a top cap (like on the Evo7) and it seems that it's either the chassis plate or the spur shaft to resist longitudinal flex around that zone. Although the Evo7 also has this discontinuity lengthwise, they're located close to gearbox area where the effects of bending are less significant.
Just finished building mine, and yes there is loads of flex around that area where the spur gear is.

Disappointing that they didn't bridge it with a top cap like on the evo 7. I wonder if the part from the evo 7 would fit if you get get hold of one.

I hope tamiya releases it as a hop up option, my biggest fear is the chassis splitting there in a collision.
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Old 11-28-2022, 04:11 AM
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Originally Posted by hipwell
Just finished building mine, and yes there is loads of flex around that area where the spur gear is.

Disappointing that they didn't bridge it with a top cap like on the evo 7. I wonder if the part from the evo 7 would fit if you get get hold of one.

I hope tamiya releases it as a hop up option, my biggest fear is the chassis splitting there in a collision.
The one from the Evo7 will likely not fit as you would then lose the mounting points for the Evo8 top decks, moreover the Evo7 top cap uses three screws and the forth hole being a keyed opening.

Just by photos, the chassis (esp. being carbon) should be okay in a hard frontal impact, and most likely the spur shaft and bearings would take the hit.

They could have made a bridged top cap with offset mounting points and slightly shorter top decks. Only time will tell if it's an issue or not.

As far is as I know Tamiya has stopped the strategy of offering hopups for Evo specific cars since as far back as the Evo6, likely due to the much smaller production quantities compared to their other RC lineup. A run of MS version of kits is more likely than hopups.
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Old 11-29-2022, 07:50 AM
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Originally Posted by Casey
minidriver we need you to come out to the TCS race in Maryland in Feb.
Did you get one of these?
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Old 11-29-2022, 09:24 AM
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Anybody used it yet? I will be on Friday, low/medium grip carpet, stock setup.

The stock front end seems quote narrow, it suggests the e block with the inserts inwards 1 notch, which i assume is what on the old system would be a D block.

I've always found F to be the best on my 419xr.

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Old 11-30-2022, 07:41 PM
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Can the car be set up so the battery be mounted on either side? Anyone know?
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Old 12-01-2022, 03:00 PM
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I think so.....Checkout the manual...
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