 Nyorai kupfuurira kweiyi ndima - 1989 rakanga riri gore rokutanga umo injini dzomuzvarirwo dzakaputirwa dzakanga dzichimanikidzirwa nokuda kwamapoka ose pashure pokurambidzwa kwezvikwata zvine turbocharged pamugumo wemwaka wapfuura. Nokuda kwechinangwa ichi, Honda akavaka injini ye3.5-litre V10, yakagadzirwa mukati memazuva akawanda ehafu yekupedzisira ya1987 uye kuburikidza na1988. Iyo MP45 yakafumurwa kuti iongororwe pre-mwaka uye yaive pakarepo pane nhanho, pamwe nekuvimbika. Yakagadzirwa naNeil Oatley, MP45 yakaratidzika semotokari yokurova mumwaka mutsva. Nepo Ferrari mwaka iwoyo yakanga iri motokari inomhanyisa yose-yakapoteredza kunyanya mumaoko aNigel Mansell, yakanga isinawo kuvimbika kwenguva refu nekuda kweiyo itsva semi-electronic gearbox shift, ichipa imwezve mukana kuna McLaren. Iyo Honda-powered MP4 5 yakaratidza kuva nekukurumidza kwakakwana pamusoro pevamwe vese, ne 15 nzvimbo dzepamusoro, 13 yavo naSenna iyo yakaenzana neyakagadziriswa muna 1988 muMP4 4. MuMexico Grand Prix, Senna akawana danda rake rechi 34 mubasa rake muMP45, achiputsa rekodhi yapfuura yemakumi matatu nematatu yaichengetwa naJim Clark uyo akanga amira kubvira ipapo. 