Monthly Archives: June 2014
After the build review of the Samix TRF418 kit , which I posted when the kit became available late April, I have been waiting for a chance to test it. Due to the weather, track availability and other more urgent matters this test has been delayed more than I wanted, but I finally got a chance to do a proper test last week. And while I have now back-to-backed it with the original 418 configuration, I will continue this and possibly post more findings later.
Anyway, back to last weeks test and first impressions. The way I tested it was that I bolted it on one piece at a time to see the effect of each one of them. Meaning that I started off with a standard 418, then exchanged the lower deck followed by the top deck and finally the motor mount, allowing a couple of packs running between each step to form a good idea of everything.
The results were all positive with each step improving the car, which obviously is a very good thing and left me very positive by the last run of the day. It was clear already after just changing the lower deck to the narrower and crucially softer, Samix spec chassis, that this improved the grip in the car. The car however really came together late in the day with the motor mount added. The 418 also felt even more responsive to change in this configuration, usually a good sign of a chassis working well. The final configuration I run the car in was as mentioned with the Yokomo style motor mount, with all screws in the upper deck. I did not run the steering brace and post connecting to the upper deck at the front though, but did run the screw in the center post in front of the motor mount (I found this was significantly better in this configuration).
So following the positive first impression and build of the Samix conversion, the same trend definitely continued on track. Look forward to more running with it.
I promised in my TB Evo 6 build post that I would post more on the Evo 6 dampers.
At first look it was a bit difficult to see any difference to the already available 42273 TRF Short Dampers with all external measurments appearing the same. However, since there is no part number for some damper parts in the Evo manual and Tamiya have written about big bore dampers in Evo 6 introductions, I figured there has to be a difference. Of course there is one, it just took some measuring to find it since the difference is in the internal measurments of the damper cylinders.
The difference is small though with the inner diameter being just 0.5mm larger on the Evo 6 dampers. Therefore also the pistons are 0.5mm wider. It might seem an insignificant increase, but with the cylinders just a couple of millimeters shorter it means the cylinder volume is very close to the same as in the standard TRF dampers which we find for example on the TRF418.
The shafts included are the TRF M-damper titanium coated ones already available for a couple of years and 2mm shorter than the normal length TRF damper shafts. Overall this makes the dampers 4mm shorter which means they are 57.5mm normally built. Significantly, normal length springs can still be used, which means all normal springs like HPI and Yokomo, as well as the included new 42278 Damper Large Diameter Spring Set (TRF) fit. As can be seen by the completed TB Evo 6 photos, this means the upper spring retainers are only turned about 3 turns on the Evo6 to achieve normal ride heights.
Perhaps we’ll see this configuration on the TRF418 cars at the Worlds this year…?
Run the TB Evo 6 for the first time yesterday.
The conditions were a bit tricky but improved throughout the day, and I had the 418 setup with the same components for a comparison. I spent more of the day running the Evo 6 and had the 418 with me more as a reference point. For this test I run 0-timing and 10.5, which is the Pro Stock class here.Both cars I run for the first time on this track.
Based on this first test these are my notes:
– the Evo 6 was better than I expected and handling was good from the start
– as I expected the car is quite loud
– the motor stayed quite cool in the car, this will be partly be because it’s sticking out so far that it gets more airflow, but it also means that the drivetrain is fairly free
– no reliability problems, although the servo mount is not as well designed as on the 418, and will move to throw tracking off-center if you hit something hard enough with your front wheels
– the car feels quite easy and safe to drive but with good steering
– the 418 is still the faster car though, proven when I switched back to the 418 late in the day and immediately went quicker – it was 0.1-0.2s faster (if this is the same with both cars perfected I cannot say, but I believe so)(now both cars did not have the perfect setup)
– 418 need a lower deck made out of the same material as the Evo 6 one…