Bumpstarts impco fed 1986 FC rx7 turbo ( rotary )
Posted: Wed Jun 29, 2011 10:37 am
hello,, i am bumpstart from sunny west oz , here is a few little details on my daily user rx7 turbo ( on LPG )
the engine is a self built s4 6P with a mild ported turbo primary plate, turbo s4 rotors and oil pump
the inlet manifolds are s4T,, modded suit the 6P secondary plates
[ for non rotor heads,, it is a franken- engine using NA and turbo engine parts to get the better combinations of porting and compression ]
turbo is also self built and its a s5 hybrid using V trim to4B front and knjghtsports cover , HKS wastegate can
3 inch combined backplate and dump, with 2 x 2.25 rear
equipment used : impco 225FB mixer ( standard ) , impco model E convertor ( standard ) , commander lambda feedback controller and solenoid
65L ( 45 usable ) litre conventional "manchester" style tank
floor rear of back seat has been boxed and raised so as to retain the stock fuel tank ground clearance
( though is not necessary by the code to remain minimum clearance if retaining stock ride heights )
distributer from 12at is retrofitted,, i am running ONLY leading ignition ,, in wastespark direct fire
( note no leads in dizzy cap )
i have trialled many forms of ignition,, from 2nd gen DFI , stock 12at,, sequential EFI ( microtech ) ignition
and also many combinations of ignition curves
ATM,, half mech curve,, ( from a 10 BTDC ignition timing at idle ) and 12aT boost retard pot seems to be a very stout combo
( 10 - 22 BTDC ignition curve,, with about 8 degrees retard at 12- 15 pounds boost )
on a LSU 4.2 wide band oxygen sensor and engine at 180F ( LPG corrected AFR )
idle- 15.5 : 1
cruises- 15.5 : 1
WOT in 3rd at revs - 12.8 : 1
decel at 18 :1
eomp controller in operation on my current setup
http://www.youtube.com/watch?v=X4kIGRg24no
my previous manifold setup is now on a RESI engine and fitted into a b2000 ute , 286 RWHP , 13 psi on an S trim s4 highflow and 2.5 inch exhaust system
http://www.youtube.com/watch?v=59Yt8gH9i5w
the engine is a self built s4 6P with a mild ported turbo primary plate, turbo s4 rotors and oil pump
the inlet manifolds are s4T,, modded suit the 6P secondary plates
[ for non rotor heads,, it is a franken- engine using NA and turbo engine parts to get the better combinations of porting and compression ]
turbo is also self built and its a s5 hybrid using V trim to4B front and knjghtsports cover , HKS wastegate can
3 inch combined backplate and dump, with 2 x 2.25 rear
equipment used : impco 225FB mixer ( standard ) , impco model E convertor ( standard ) , commander lambda feedback controller and solenoid
65L ( 45 usable ) litre conventional "manchester" style tank
floor rear of back seat has been boxed and raised so as to retain the stock fuel tank ground clearance
( though is not necessary by the code to remain minimum clearance if retaining stock ride heights )
distributer from 12at is retrofitted,, i am running ONLY leading ignition ,, in wastespark direct fire
( note no leads in dizzy cap )
i have trialled many forms of ignition,, from 2nd gen DFI , stock 12at,, sequential EFI ( microtech ) ignition
and also many combinations of ignition curves
ATM,, half mech curve,, ( from a 10 BTDC ignition timing at idle ) and 12aT boost retard pot seems to be a very stout combo
( 10 - 22 BTDC ignition curve,, with about 8 degrees retard at 12- 15 pounds boost )
on a LSU 4.2 wide band oxygen sensor and engine at 180F ( LPG corrected AFR )
idle- 15.5 : 1
cruises- 15.5 : 1
WOT in 3rd at revs - 12.8 : 1
decel at 18 :1
eomp controller in operation on my current setup
http://www.youtube.com/watch?v=X4kIGRg24no
my previous manifold setup is now on a RESI engine and fitted into a b2000 ute , 286 RWHP , 13 psi on an S trim s4 highflow and 2.5 inch exhaust system
http://www.youtube.com/watch?v=59Yt8gH9i5w