23-04-2014, 09:57 AM
That's pretty light for a 306 given that they're what, 150kg+ up on that as standard? Indeed, I'd say that's probably not far off what a (fully trimmed) 205 GTi-6 weighs in at!
I can't help but wonder if the absolute figures aren't on the optimistic side as ~100lbft/litre would be exceptionally given comparitiverly modest spec? Either way, even assuming they're a few percent high it goes to show what difference paying attention to induction length and some hotter cams makes and that's going to go pretty damned well in a sub-tonne 306, especially with the chassis sorted so that it'll carry that speed through the corners too
Did you do a dummy build to check valve-piston clearance? It's all too often worryingly tight on anything but the mildest of cams on standard GTi-6 pistons as I'm sure you're well aware. Was it the Cat Cam 106's that you went for in the end? 109's would be suicidal on standard pistons IMO but 106's would probably be just about OK providing that the timing is bang on and it's never had a head skim of note.
Anyway, thread has been a good read and I've found the adaptability of the standard ECU to run throttle bodies quite interesting - I'd seen it done with older more basic management before (eg Motronic M3.1) to good effect.
Enjoy the 'Ring - this should be very well suited I reckon
I can't help but wonder if the absolute figures aren't on the optimistic side as ~100lbft/litre would be exceptionally given comparitiverly modest spec? Either way, even assuming they're a few percent high it goes to show what difference paying attention to induction length and some hotter cams makes and that's going to go pretty damned well in a sub-tonne 306, especially with the chassis sorted so that it'll carry that speed through the corners too
Did you do a dummy build to check valve-piston clearance? It's all too often worryingly tight on anything but the mildest of cams on standard GTi-6 pistons as I'm sure you're well aware. Was it the Cat Cam 106's that you went for in the end? 109's would be suicidal on standard pistons IMO but 106's would probably be just about OK providing that the timing is bang on and it's never had a head skim of note.
Anyway, thread has been a good read and I've found the adaptability of the standard ECU to run throttle bodies quite interesting - I'd seen it done with older more basic management before (eg Motronic M3.1) to good effect.
Enjoy the 'Ring - this should be very well suited I reckon
1990 Peugeot 205 GTi 1.9 // 1991 Peugeot 205 GTi 1.9 16v // 1992 Peugeot 205 GTi 1.9 // 1999 Peugeot 306 HDi Estate