Last week I took advantage of the nice autumn weather and went testing with the TRF419XR and MTC1 to the Laukaa track where I missed a race earlier in August. All of my TC running this summer had been at the Kypak track, and I wanted to especially test the MTC1 on another track to get a better idea of the car.
After 1,5h of cleaning the track to start with, it was a beautiful day with at least decent testing conditions, although the track was a bit dirty and therefore not very quick. I mostly spent time with the MTC1, as I knew I had a good setup for the TRF419XR.
The MTC1 proved much more of a struggle on this more normal track, and although I improved the setup throughout the day, I was never really happy. As soon as I, towards the end of the day, switched to the 419XR, the consistency and laptimes were better. The most noticeable change was that I felt a lot more comfortable with the TRF.
So the conclusion was that the TRF419XR is still just as good as it has always felt, and that I need to work more on the MTC1. Unfortunately, there will be no more outdoor running up here for this year. Hopefully there will also be some improvements from Mugen for the MTC1 platform. I really like the car, but at this point my choice for racing between these two cars would always be the TRF419XR because it is a car that will always work.
Below a picture of the track, and the setups I ended up with. The TRF setup is pretty well sorted, but on the MTC1 setup there is still a lot of work to do as I already mentioned. Still thought I would post it as a reference.
You can click on the setups for PDF sheets.
Best laps in similar conditions were 0.1-0.15 faster with the TRF.
Best 5 minute results were 3-4 seconds faster with the TRF, but also much more repeatable.
TRF419XR testing setup.
Mugen MTC1 testing setup (forgot to mention that A2121 is upside down (no shims).
Best 5 minute run of the day with the TRF:
Final official info and a high resolution image on the TRF419 37T Aluminum Gear Differential Case from Tamiya Inc.
42325 TRF419 37T Aluminum Gear Differential Case
★ This precision aluminum case can be used in place of kit-standard resin equivalent.
★ Offer excellent resistance to deformation, thus helping cool the silicone oil inside and also minimize leaks.
★ The result is a smooth, consistent drive.
★ Gasket and screws are included.
TA07 PRO, TRF419 XR, TRF419X WS, TRF419X, TRF419 & TRF418 Chassis
(October 20 – Japan release date)
After a was prototype shown earlier this year, the new Destiny RX-10FF chassis will now finally be available very soon, as Destiny have now released the first official picture of the car. Looking forward to seeing more of this FWD release.
I already published the official product info from Tamiya on the TA07 MS in English, but this translated from Japanese info contains a bit more details.
● It adopts high efficiency single belt drive 4WD, and it is a model which further improved the running performance of TA 07 PRO which can select of three motor positions .
● The main frame is a combination of carbon lower deck and two vertical upper decks, optimally matching rigidity and bending.
● Adopt aluminum bulkhead that mounts the front and rear drive system about 2 mm lower, increasing the traction during acceleration. The stabilizer adopts the latest bearing support specification.
● Set the motor mounting position inside 1 mm to optimize right and left balance. In addition, adoption of 20T center pulley minimizes belt tension and reduces rolling resistance.
● Suspension is the same as TRF419XR.
● A special carbon damper stay for use in combination with a TRF damper is also set, such as a special venue and a course with gaps, when the vehicle height is required.
Main product content
● Carbon lower deck (2.25 mm)
● Carbon upper deck (2 mm) Vertical arrangement 2
● SSBB front and rear carbon damper stay (3 mm) for damper
● TRF damper front and rear carbon damper stay (3 mm)
● Carbon Battery Plate (2mm)
● Carbon bumper support (2 mm)
● Carbon Servo Stay (3mm)
● Aluminum lower bulkhead
● Aluminum upper bulkhead
● Aluminum motor mount
● Aluminum 20T center pulley
● Aluminum counter pulley
● Aluminum belt stabilizer
● Aluminum suspension mount (05E – 05E – 1XA – 1D)
● Aluminum Turnbuckle Shaft
● Aluminum Steering Wipers
● Aluminum Servo Mount
● SSBB Damper
● Double Cardan Drive Shaft (44 Size)
● 44 mm lightweight swing shaft
● Clamp type aluminum wheel hub (4 mm thick)
● Bearing retaining type stabilizer
● Full bearing specification
A bit of fever unfortunately cancelled my FF testing plans for this week of beautiful weather, but before this week I have made a bit of further progress on the FF2017 car which I have now been running since August 2016.
If you have not read about this project car before, but would like to, check here:
I still plan to test as much as the weather allows over the next month or so, but thought I would share some small things now.
Previously this summer I tested different FF bodies extensively, and have also continued that a bit, with the Fiesta eventually coming out as the preferred choice on our small technical tarmac track, with its consistency over 5 minutes the deciding factor. As a further update on the body tests, I also need to mention that I briefly tested the best bodies on a larger and much faster tricky track (which you can see here), and there the Subaru was mighty, being much more stable than hatchback bodies.
Now on to the chassis tests though.
The car I still run is basically the same as at the end of 2016, as last summer saw very bad weather, problems with the local track, and a bit less motivation, so as a result much less running.
The main change I have done so far, except for normal setup stuff, is that I now run some modified Tamiya “short reversible suspension arms” up front, i.e. the arms used on the TRF416/417. I had already been running these arms in standard form up front before as opposed to the 418/419 arms, as they allowed the front wheels further forward. I have now taken this a bit further by cutting the front part of the suspension arms by 3.5mm, which in turn means I can space the arms 3.5mm further forward, pushing the front wheels even more towards the front.
There are lots of benefits of doing this, as the weight of the motor is now 3.5mm closer to the front axle, the front drive shafts are now almost straight instead of pointing backwards, and the front overhang is even less, meaning that the front will scrape the ground even less.
It required a bit of tinkering to get right as it affects a lot of things like the steering, clearance here and there and so on, and still could be much improved, but back-to-back testing confirmed this change improved the feeling, laptimes, and especially consistency.
This mod obviously made the wheelbase very long, and later moving the rear wheels forward to go back to a 259mm wheelbase again improved the car. Further on I also moved part of the weight in the car forward to compensate for the F/R weight balance change of moving the wheels. This was a further improvement.
I will next do further tests to see what is the ideal weight placement with this new layout.
Finally a few pictures to detail these changes.
As you can see in this first image, the front overhang is now super short for an FF chassis. You can also see the two weights moved forward to beside the front of the shorty battery.
Another view to show the position of the motor in relation to the front axle.
Here you can see how far forward the arms are pushed on the standard 46mm hinge pins.
A view of the now straight front drive shafts, as well as motor position, and how I had to cut the front foam bumper corners to allow the wheels to turn!
Front wheel position on the current Fiesta body is now fairly extreme…
…neatly reminding me of one of my favourite full size racing cars, the Polestar Volvo C30 S2000 STCC/WTCC car.
That’s it for this post. I will most probably do another FF update at some stage in the next month, as long as I learn something during that time. Thanks for reading.