Bumpstarts impco fed 1986 FC rx7 turbo ( rotary )

Let's hear all the gory details about your car and how it became alternative fuelled.
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bumpstart
Posts: 132
Joined: Wed Jan 20, 2010 9:09 pm

Bumpstarts impco fed 1986 FC rx7 turbo ( rotary )

Post by bumpstart » 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



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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
when the going is hard, don't retard, remember your lubrication


LPGTE21
Posts: 4
Joined: Sun Feb 06, 2011 1:58 am

Re: Bumpstarts impco fed 1986 FC rx7 turbo ( rotary )

Post by LPGTE21 » Fri Aug 03, 2012 5:10 pm

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.

Johnmaster
Posts: 154
Joined: Mon Sep 20, 2010 5:58 pm
Location: Mukwonago, WI
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Re: Bumpstarts impco fed 1986 FC rx7 turbo ( rotary )

Post by Johnmaster » Tue Sep 04, 2012 12:02 am

Turbo propane rotary, I don't think three cooler words could be assembled in one phrase. Nice!

bumpstart
Posts: 132
Joined: Wed Jan 20, 2010 9:09 pm

Re: Bumpstarts impco fed 1986 FC rx7 turbo ( rotary )

Post by bumpstart » Sat Sep 24, 2016 8:04 am

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 !

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when the going is hard, don't retard, remember your lubrication

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