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
Bumpstarts impco fed 1986 FC rx7 turbo ( rotary )
Bumpstarts impco fed 1986 FC rx7 turbo ( rotary )
when the going is hard, don't retard, remember your lubrication
Re: Bumpstarts impco fed 1986 FC rx7 turbo ( rotary )
That sounds beautiful!! I did not realize you could use a FB mixer with a Turbo blow through? How are all the vacuums referenced/connected??? I have a '74 RX4 in my driveway runs, smokes not driven, a '73 RX2, 2-dr wobbly, steering automatic, runs sitting in my garage not driven and a '73 RX2 4-dr on a trailer in storage no engine GSL SE front struts and of course not driven. I am in the process of building my '73 Corolla TE21 with a rebuilt 3TC, Datsun truck rear axle, AE86 struts, AW11/MR2 Rack and pinion and LPG turbo so the feedback option would be awesome.
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Re: Bumpstarts impco fed 1986 FC rx7 turbo ( rotary )
Turbo propane rotary, I don't think three cooler words could be assembled in one phrase. Nice!
Re: Bumpstarts impco fed 1986 FC rx7 turbo ( rotary )
well. ive been a bit slack updating this one
still my daily user . motor has now progressed to a mildport 13bt ( 4 port ) . though im still using the same turbo combo
a haltech e8 ecu has been running full sequential 4 coil ignition, boost control , safety cut and power valve solenoid operation for many years
and there is now an extra model L convertor mounted vertically under the pipework , out of view
still running impco CDP- 02 lambda feedback, running at lambda or very close under most non WOT conditions when fully warm
exhaust temps at WOT of 1050C are holding this setup back . im weighing up water injection ( mounted in hatch )
or jumping fully to vapour EFI , as that will free up some space !
still my daily user . motor has now progressed to a mildport 13bt ( 4 port ) . though im still using the same turbo combo
a haltech e8 ecu has been running full sequential 4 coil ignition, boost control , safety cut and power valve solenoid operation for many years
and there is now an extra model L convertor mounted vertically under the pipework , out of view
still running impco CDP- 02 lambda feedback, running at lambda or very close under most non WOT conditions when fully warm
exhaust temps at WOT of 1050C are holding this setup back . im weighing up water injection ( mounted in hatch )
or jumping fully to vapour EFI , as that will free up some space !
when the going is hard, don't retard, remember your lubrication