spark-only delco conversion

[BradGTV]

has your mate got a pair of carbies already?

i have a pair of freshely rebuilt dellorto dhla's 40 mm that are set up for blowthrough turbo or supercharge, these are the ones that come with shaft seals and the top hat that boost is plumbed into to, give me a pm if hes interested.

[keto]

just a quick up-date to show this project is still underway...

most of the mechanical stuff is done, just finishing the sump and other little things...

haven't prepped the carbs for boost yet, sent brad a pm a while back but i guess he doesn't log on here often?
got a 808 and loom to hack up, haven't found a cheap 2bar map sensor yet, have afew of these sensors that run electronic boost/vacuum gauges but haven't got round to testing them to see if there just normal map sensors? and haven't come across a second hand ignition module in my travels yet so might have to buy new

and still need to do a heap of reading on how to tune dellorto's

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[Poida]

I'm wanting to set up a Gemini G161Z that currently runs LPG using an RB reluctor conversion so I can use an 808 as a spark only ECU. I have a Camira loom that I can use and once I sift trough some boxes of bits I'm sure I'll find most of the bits needs that I scrounged off 808 equipped car setups.

I already have the Moates APU1 AutoProm so reprogramming hardware is no issue. For the car itself, thought is to lock the dissy (no more mechanical advance) and use a MAP sensor, MAT sensor and an engine coolant temp sensor. Can't see that I'll need the IAC as I'm not wanting to control fuel.

I wasn't planning on using the VSS but I wonder if I might need to. I have an inline one that I used as the sensor on a cruise control. I got that from Command Autogroup back in about 1999, they may have them still. I don't have an O2 sensor but I have a exhaust manifold with provision for one if needed.

So, if anyone who has already done this work wants to help me out with the finer details of what's involved, I'm all ears. I'll happily make up a generic tutorial to help others out based on what I learn doing this for myself.

[keto]

hey mate, sounds like your doing a very similar setup to me, i won't be running a IAC either, unfortunately im also unsure if a VSS is a requirement... so can't help you there

mine is not going to use a o2 sensor for normal conditions, but i am going to put the wideband in there and log to the laptop using $12P to help with tuning of the carbs

with your setup, i wonder how a map sensor would deal with lpg?? what type of lpg mixer are you using?

[antus]

Vss is really only used for the ecu to know when your speed is below the idle threshold, to then go in to idle mode and adjust the iac as part of obtaining the correct idle rpm. You can omit both, and mask the errors so the check engine light does not come on.

[Poida]

I'm planning on usings an Impco 225 mixer and a throttle body similar to the way the VP factory LPG setup is.



I'm more or less trying to do as GMH did but on a smaller engine that has been set up for performance and without it being dual fuel.



Thanks Antus... I'm planning on using a T series Gemini dissy housing with fixed shaft so no mechanical advance and no vacuum advance, RB Gemini reluctor pickup, JE Camira style ignition module and JE Camira type MAP sensor. All of the advance is to be programmable through the ECU. I'm going to need to pick your brains on this a bit, some of the details I don't yet have a handle on. Is there any value in using MAT and coolant temp sensors for fine tuning as the engine warms to full operating temp?? Could you suggest what other components I will need to set up in way of sensors etc... and how to go about fooling the ECU into not setting error codes. What about an O2 sensor... does it have any interaction with ignition timing changes?

[delcowizzid]

the more sensors the better TPS MAT CTS MAP and dizzy connections mainly then you get spark control for engine temp correction and air temp loose to many sensors and you will most likely have to get rid of a seperate idle spark table and rely on main spark table .will show everything as well its handy having speed tps map and temps etc on datalogging

[Poida]

I want to use all the resource info possible, only omit things that have no bearing on the spark side of things... I have a JE Camira EFI loom that I'll be working with. Obviously the Camira VSS is not a simple thing to adapt but I have an inline VSS sensor sold for those Command Auto Group AP90 cruise controls which attaches piggy back style at the gearbox end of the speedo cable. Just not sure about how many pulses it sends per turn single turn yet. I know the cable number of turns per KM is 637 for the Gemini.