Mugen MBX8 Toe block meassurements

It’s been a while, but I’m racing again since June 2019 after a 4.5 year break and I will try to post something on this blog from time to time.

Mugen came out with the optional +2mm and +4mm toe block this summer for the MBX8 vehicles. I was wondering how they would affect handling of the car and how much toe in they offer. So I ordered both blocks and started measuring.

I installed all the blocks in my car with the middle insert for the rear toe block. I then put the car in my Hudy setup bench and try to figure out the toe in. The Hudy bench isn’t super accurate to see 0,25° increments, but I measured multiple times and took the average value. For example, with the stock block I measured 2.5°, 3.0° and 2.75°, so I took 2.75° as the average value which should be correct.

I have also measured the wheelbase, because when you take away toe-in, the wheelbase gets longer and you should compensate by moving the rear hubs forward to achieve the same weight balance and axle plunge.

I haven’t driven with the +2mm and +4mm blocks yet, but that’s on my list when the weather gets better. I’ll report back when I have tested them.
Beware that they probably won’t be useful on low to med grip tracks since they take away rear grip. But the car should be smoother on turn in and have more corner speed on high grip tracks. At least that’s the theory.
I know that Adam Drake and Ryan Maifield used the +2mm block in their buggies at the ROAR nats which was high grip. And Shin Adachi uses +4mm block from time to time on high grip tracks.
And if you own a truggy, these probably are certainly worth a try. I have driven an MBX8T one time and it could definitely use more steering.

Here is the table with the measurements. In case you have any questions about this, leave a comment and I’ll do my best to reply asap.

Measurements made with middle insert in rear toe block
Front toe block	Toe in	Wheelbase	Wheelbase difference
0mm (stock)	2.75°	321mm	0mm (base)
2mm	1.75°	323mm	+2mm
4mm	0.75°	325mm	+4mm