Maximum boost thread (93 oct > pump petrol/gasoline only!)

PSI · 03-01-2014, 12:17 AM

Still only on 40psi boost but now with a larger BW turbo. As of last nights dyno session the car now has 640kw/858hp at the wheels vs the 740hp previously with the smaller turbo. Best trap speed with the smaller turbo was 158mph, 2400lb car. H pattern gearbox, 26x8 tyre, leaf sprung rear end.

I would have run up to 45psi on the dyno (map sensor limit) but the wastegate spring will only allow 40.5psi (280kpa). If the engine is still going when the season finishes I'll probably change w/g springs and see what it makes on 45psi, time permitting. I'm not holding out too much hope though, the engines done almost 2 seasons racing plus 2 powercruise events, dirt drags, and whatever else. I'm glad I didn't switch to E85 yet, pump petrol is starting to get real interesting now!

03-01-2014, 12:17 AM	#29
PSI The Newbie Join Date: Feb 2012 Posts: 18 Rep Power: 0	Still only on 40psi boost but now with a larger BW turbo. As of last nights dyno session the car now has 640kw/858hp at the wheels vs the 740hp previously with the smaller turbo. Best trap speed with the smaller turbo was 158mph, 2400lb car. H pattern gearbox, 26x8 tyre, leaf sprung rear end. I would have run up to 45psi on the dyno (map sensor limit) but the wastegate spring will only allow 40.5psi (280kpa). If the engine is still going when the season finishes I'll probably change w/g springs and see what it makes on 45psi, time permitting. I'm not holding out too much hope though, the engines done almost 2 seasons racing plus 2 powercruise events, dirt drags, and whatever else. I'm glad I didn't switch to E85 yet, pump petrol is starting to get real interesting now!