Required modifications (based on a Tamiya 107B kit):
The following list is collected from internet forums, email exchange with other modelers and an article in an old Tamiya Magazine about this conversion.
Suspension
- modify front suspension pick-ups for passive suspension
Bodywork
- Engine cover shape is correct
- Engine cover has extensions to the rear
- two air ducts in rear engine cover
- central (differential) air duct on rear engine cover is closed
- (Front of) side pods shape is correct
- Air exits in side pods need to be opened and scratch-built
- Fuel fillers only needed for Brazilian GP and Pacific GP specs, later they had a cover in body color
- use Tamiya Ferrari F189 gear shift lever, but can also be scratch-built very easily!
Wings
- Front wing is correct (107 has different wing)
- Vortex generator is ok until Monaco, Later races had no vortex generator and smaller end plates!
- Rear wing is ok until SanMarino, later versions had different end plates!
Gearbox
- semi-automatic gearbox initiated by a shift lever, difference in casing is unclear
- 10cyl-Mugen would be slightly longer than 8cyl-Ford of the 107B (see wheelbase differences)
Possible donors for engine MF-351H-C (ZA-5C)
Modeler's Footwork FA13 (Mugen MF-351H)
- almost the same engine
- needs a different exhaust collector
- kit includes Mugen/Honda script
- peripheral parts differ
Tamiya Tyrrell 020 (Honda RA101E)
- needs different cam covers
- almost the same exhaust collector
- has also some peripheral parts that closely match the Lotus configuration (coolers, piping)
- Mugen/Honda decal or PE script needed
Dimension differences
- Wheelbase: 2950mm (107C) - 2900mm (107B) due to the length of the Mugen engine...
- Track front: 1650mm (107C) - 1650mm (107B)
- Track rear: 1600mm (107C) - 1610mm (107B)
As a sidenote it has to be said, the Tamiya Lotus 107 kit is not a good base. It has a longer nose cone, different (not angled back) front wing end plates, a slightly different engine cowl and some other smaller issues.
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