all turbo cars run a valve in the BOV pressure side. If manifold pressure exceeds the allowed pressure the valve closes, causes the BOVs to blow open and drop all boost. Painfully effective. In fact it really doesn't work well with the stock system because it spikes and then returns, I had to add a boost controller to keep the spikes under control. max boost I saw today was 11.3 psi dammit.
mate the car was a shitbox in the wet (don't believe what you read on the internet abotu 4wd in the wet....it does SFA for mid corner speed). But in the dry it went f**king great, I was holding down 4th place with an emo X, emo 9 and sti only in front of me. pretty good for a 20yo car with a hack driver. And I had the wrong damn tyres on again. bring on wakie!
What went wrong was....the fuel sender was borken, we chucked in all the fuel we had in jerries to be safe. 25min race, 3 warm up laps after the trouble on the grid....I just ran out of fuel on the second last lap. I could hold say 2000rpm without running out of fuel but anything above that it broke down Won't happen again.