TheRcRacer TT02 - S / SR / SRX TRF420 lower plates

NOTE : At the moment you will need to email fibre lyte to order these. Only the older ones are on the website. I will update this article once the new parts are on the website.

The front and rear TT02 plates have been really popular with TT02 -S racers. For some time I have had a lot of requests to revise these to work with the much better TRF420 style suspension arms. I've had these parts ready for a very long time but have made a few small tweaks along the way and now they are ready to purchase from Fibre lyte.

The main change is that these parts will work with both the std reversible suspension that is included with the TT02-S / TT02-SR, importantly they will now also be compatible with the TRF420 arms that are supplied with the Tamiya 58720 TT02-SRX kit. So not only will you save weight, you will also have the ability to adjust droop. One of the most powerful set-up options for an onroad race car.

The other addition is that they are now adapted to use the 51644 TRF420 bumper B-Parts. These allow you to move the body forward for more corner speed, it also allows you to add the 54976 brass bumper posts for weight balance adjustment.

With these parts you will save weight, increase durability and most importantly have more tuning options. 

These plates are compatible with the following Tamiya TT02 models

• Tamiya TT02-S
• Tamiya TT02-SR
• Tamiya TT02-SRX

Fitting instructions for the front

You need the following

• 2 x 3x6mm CS screws (can be 3x8mm or 3x10mm if needed), to attach the Tamiya suspension block.
• 3 x 3x8mm CS screws to attach the plate to the chassis.
• 2mm spacer with a 3mm hole (Tamiya 53539 is ideal). (Not needed but good if you want to make the surface contact stronger)
• 1 x Tamiya 54880 Aluminum Adjustable Suspension Mount (XB). **Note** This block is needed as the inner front suspension holes are approx XD width.
• 5 x 3x10mm cs screws to build the bumper assembly and attach it to the chassis plate
• 2 x 3x10mm button head screws to secure the bumper via the top plate.
• 1 x Tamiya 51644 TRF420 B-Parts (Bumper parts and posts)
• 1 x Tamiya 51650 TRF420 Urethane Bumper 

First up you want to mount the suspension block with the 3x6mm screws. I would recommend using the N3 blocks with them on the inside to have 0deg (Or close) of front arm sweep.

You attach it to the three holes underneath the chassis. The middle screw hole is 2mm lower than the outer holes so I used a 2mm spacer. This spacer will ensure that you get a better surface area against the plate, making it more secure. So just screw in the 3x8mm screws. Fit the centre screw first and then move onto the outer screws and make sure that it is straight.

Now you need to build the front bumper. The Tamiya 51644 and 54650 are all you need. I used the optional Tamiya (13404111) carbon bumper support for added bling (The plastic part is very similar weight). 

The bumper is attached with the three screws 

If you are still using the reversible suspension arms, you will need to move the droop screw position to the rear.  This is much easier to get to than when they were positioned at the front. 

All done..  

Now take a look at some of the tuning settings you can perform with the new parts.

Changing the front arm sweep

As the block is adjustable you can select a range of front sweep. In reality I would not suggest you never go above 1 degree. I have provided a chart below. You can use the adjustable blocks, or the older suspension blocks if you have them at hand.

Front arm sweep makes your suspension bind as the front hinge pin is at an angle. This makes the front end stiffer. This is because as the weight moves forward the hinge pin is angled into the opposite direction of the corner. This delays weight transfer going forward but as the suspension binds it applies more pressure on the tyre, creating more traction and increasing your mid to exit corner steering.

• More arm sweep = less initial turning but more in the corner around the apex.
• Less arm sweep = More initial turning, less at the corner apex

Changing the Suspension pin height

With the Tamiya blocks you can also change the height as well as the width. This changes the angle of the suspension pin providing you with rear pro-squat / anti squat.

Front Kick-up / Pro-Dive  is where the front of the suspension pin is higher than the rear point. This will give you more initial steering, but less as you go around the corner.

Anti-Dive is when the front of the suspension pin is lower than the rear. This gives you less steering as you enter the corner, and more around the rest of the corner.

For lots more detail, on all of these settings and more, check the suspension guide I made here (Click link)

Fitting the rear plate

Fitting instructions.

You need the following

• 2x6mm CS screws (can be 8mm or 10mm if needed), to attach the Tamiya suspension block.
• 3x8mm CS screws to attach the plate to the chassis.
• 2mm spacer with a 3mm hole (Tamiya 53539 is ideal). (Not needed but good if you want to make the surface contact stronger)
• 1 x Tamiya 54881 Aluminum Adjustable Suspension Mount (A). This provides 1.5 - 3.5 deg rear toe . OR you can use 1 x Tamiya 54880 Aluminum Adjustable Suspension Mount (XB) This will give you 0 - 2 deg rear toe. 

First up you want to mount the suspension block with the 3x6mm screws.

You attach it to the three holes underneath the chassis. The middle screw hole is 2mm lower than the outer holes so I used a 2mm spacer. This spacer will ensure that you get a better surface area against the plate, making it more secure.

So just screw in the 3x8mm screws. Fit the centre screw first and then move onto the outer screws and make sure that it is straight.

That's it.. all sorted.. So here are are some of the tuning options that you now have for your TT02-S / SR / SRX

Changing the rear toe

As the block is adjustable you can select a range of toe-in that you need. I have provided a chart below. You can use the adjustable blocks, or the older suspension blocks if you have them at hand.

Changing the Suspension pin height

With the Tamiya blocks you can also change the height as well as the width. This changes the angle of the suspension pin providing you with rear pro-squat / anti squat.

Anti-squat is where you lower the rear suspension point, it basically helps you have more steering response, sacrificing a bit of rear grip.

Pro-squat is when you raise the rear suspension point, this provides more traction and reduces the initial steering response.

For lots more detail, on all of these settings and more, check the suspension guide I made here (Click link)

Where can I get these? (Available NOW!).

• The parts are available direct here : 
• Email sales@fibre-lyte.co.uk
• If you put this in the title 'TheRcRacer TT02-S TRF420 Front and rear Lower plates'

You can list the parts you are after and will need to give your address so they can calculate the postage and send you a paypal payment request.

Help develop more parts

If you appreciate the non profit work I have done, please feel free to tip me to help me to afford to develop more parts. You can make a safe Tip by clicking this link https://www.buymeacoffee.com/TheRcRacer

Disclaimer and thanks

These have been made as a contribution to the Tamiya racing community. There is no profit for myself and the parts can be ordered directly via Fibrelyte. These are just a tuning aid, I found them to work well, as has others who have tested parts. Every track / driving style is different so do not expect a golden bullet.

Thanks to Steve at Fibre-Lyte 

I have invested my own time and money in these parts for the Tamiya community, at no profit for myself. These designs are always helped via feedback from other racers. So please let's share feedback and set-ups and I can try to refine or design other parts in the future :)