Had my 172 cup on a RR yesterday. It made 180bhp and 157lb/ft, also did a 1/4 mile in 13.87s.
Now I understand a RR is never going to be fully accurate etc. And I'm never going to claim my car makes this much, however I would like peoples comments if they dont mind.....
As far as I'm aware my 172 cup is standard other than an aftermarket mild steel exhaust, no idea what it is, a panel filter and a fairly recent service which included new plugs etc.
I've had a short shift pin fitted which may help with the 1/4 mile time a little.
So could my car have had any other modifications in the past? And if so what might it have to make that power?
I was rather pleased with the results anyway and the car managed to fend off all of the vectra gsi's I went there with (used to have one before the cup), other than a 3.0 version.
Cheers