Powys rally ace Phil Mills will hand over £14,000 to Wales Air Ambulance (WAA) on Tuesday after helping to stage a fund-raising evening.
Phil Mills is a former world rally champion
Mills, from Caersws, near Newtown, took part in a question and answer session with fans of the sport last December.
He also helped organise a rally-themed quiz and charity auction with driving enthusiasts from Mid Wales Rally Forum.
Meanwhile, eight cyclists from North Wales Police have raised £5,000 after completing a 176-mile sponsored ride.
Co-driver Mills, 43, who won the world rally championship with Petter Solberg in 2003, will present the money on Tuesday with members of the rally forum at Mid Wales Airport in Welshpool, where the third Welsh air ambulance is based.
Meanwhile, Pc Timothy Baxter, one of the North Wales Police cyclists, said it took him and his fellow fund-raisers four "tough" days to ride from Caernarfon to Cardiff.
The cyclists from North Wales Police raised £5,000
They rode in memory of one of their colleagues, Pc Steven Nesfield, who died suddenly last summer.
He added: "We rode along the Lon Las Cymru cycle track from Cardiff to Caernarfon, passing through Brecon, Rhayader and Dolgellau on the way.
"We estimate that the total amount raised for the Wales Air Ambulance is about £5,000."
The cyclists were supported by Arriva Trains Wales.