jim21070 2 Posted September 18, 2006 (edited) What with Brainfluid speaking of an LPG conversion on his 1.6 and both Bitchass205 and I getting low-mid 40s mpg from our standard 1.6s I wonder just how high it can go and how it can be improved. I've always held an interest in tuning for economy without loosing the pep. Not for me pottering around in a 1 litre shopping trolley for economy as I firmly believe a big engine tuned for high torque low down is the way to go. The 1.6 seems a good basis for an experiment as it has all the right igredients to begin with. I think 42 - 44 mpg is perhaps the best it'll go without driving like a grandad but can it be improved? I was thinking along the lines that the old Bosch L-Jet and AFM is not the best set-up for economy with power but I do not want to go for a more sophisticated ECU controlled system. So I got to thinking after reading much about the Weber 40DCOE. It appears to be a very tunable carb and wondered if a pair of these on a 1.6 with a suitable inlet manifold could allow some really excellent economy figures but still retain the power if the throttle is squeezed hard enough. Any thoughts or am I being very muddled in my thinking? Edited September 18, 2006 by jim21070 Share this post Link to post Share on other sites
Sandy 189 Posted September 18, 2006 The original 1219cc (90bhp) Samba Rallye had twin DCOE's fitted as standard and gave better economy at 56mph than the regular 1360 (75bhp). But the Urban Cycle was another matter! Higher compression with mapped ignition is most likely the way forward for your ambitions, but does mean getting a "proper" ECU. Share this post Link to post Share on other sites
Rippthrough 98 Posted September 18, 2006 (edited) The original 1219cc (90bhp) Samba Rallye had twin DCOE's fitted as standard and gave better economy at 56mph than the regular 1360 (75bhp). But the Urban Cycle was another matter! Higher compression with mapped ignition is most likely the way forward for your ambitions, but does mean getting a "proper" ECU. Could use a wideband lambda set to run it lean at low engine speeds and throttle openings. Probably be quite happy at 16/17:1 under those conditions. Edited September 18, 2006 by Rippthrough Share this post Link to post Share on other sites
205007 12 Posted September 18, 2006 im thinking along the lines of vw and supercharged, turbocharged 1.4! Share this post Link to post Share on other sites
petert 554 Posted September 19, 2006 get a cam from a 75kW DFZ. It has far less overlap than the GTi cams. Share this post Link to post Share on other sites
