They made it two wins out of two on Day 2 when they beat the other Day 1 winners, Lanarkshire 7-2.
The Morning Foursomes were won by 2-1 with Alyson McKechin and Eilidh Briggs being in tremendous form starting with 3 birdies in a row to kick off the teams fantastic display of good golf.
Their strength in depth in the singles, spearheaded by County Champion Alyson McKechin (Elderslie) followed by, the Briggs sisters from Kilmacolm Eilidh and Megan, Gillian Kyle (East Renfrewshire) and Linsey Stevenson (Whitecraigs / Elie) shone through as they took the afternoon session 5-1.
In the other tie last year's champions, Ayrshire, lost for the second time, beaten 5 1/2-3 1/2 by Dunbartonshire and Argyll.
The West Division champions will meet the other three divisional title-winners in the Scottish county finals at Montrose Links in September.
FOURSOMES:
RENFREWSHIRE v LANARKSHIRE (Renfrewshire names first)
Alyson McKechin and EIlidh Briggs beat Susan Wood and Susan McGrenaghan 7/6
Megan Briggs and Linsey Stevenson lost to Fiona Norris and Ruth Rankin 2 holes
Liz Stewart and Donna Jackson beat May Hughes and Lesley Lloyd 3/2
Foursomes Result: Renfrewshire 2 Lanarkshire 1
SINGLES
Renfrewshire 5 Lanarkshire 1
Alyson McKechin beat Emma Caddow 3&2
Eilidh Briggs beat Fiona Scott 8&6
Megan Briggs beat Susan Woods 4&2
Gillian Kyle beat Susan McGrenaghan 3&2
Linsey Stevenson beat Ruth Rankin 4&3
Carol Whyte lost o Fiona Norris 6&4
Final Result : Renfrewshire 7 Lanarkshire 2
D&A v AYRSHIRE ( D&A names first)
FOURSOMES
Nichola Ferguson and Jill Meldrum beat Linzi Allan and Mhairi McKay 3/2
Anne Laing and Jorden Ferrie halved with Lesley
and Jenny Linklater
Laura McGeachy and Lorraine Campbell lost to Connie Jaffrey and Audrey Thomson 7/6
Foursomes Results : D&A 1.5 Ayrshire 1.5
SINGLES
D&A 4 Ayrshire 2
Nichola Ferguson beat Lesley Hendry 1 hole.
Jorden Ferrie lost to Rachael McQueen 2 holes.
Sheena McDonald lost to Connie Jaffrey 3 and 2.
Laura McGeachy beat Catherine Malcolm 1 hole.
Jill Meldrum beat Audrey Thompson 1 hole.
Anne Laing beat Mhairi McKay 2 and 1.
Final Result : D&A 5.5 Ayrshire 3.5