ra23 efi?

[SillyCarS]

would anyone be able to tell if they have put fuel injection on an 18rg and how they did it, the factory efi is hard to come by but im told a 22-rg or a 4age efi can be adapted.

also, does anyone think it would be possible to just use an sr20 intake manifold and port it to match with a dremel and then run a megasquirt system?

i wanna run injection real bad as i just got my hands on an sc-14 supercharger.

dw i will document as i go along

cheers

[ra40celica]

im also in the same boat as you, been reading alot about megasquirt and it sounds really good. just the only thing that puts me off is getting a manifold.

i was thinking of making one out of mild steel exhaust pipe. but then cant be stuffed arsing around with that.

also those who have used MS how do u run Sequential fuel injection somekind of CAS? or is basic port injection fine.

[thechuckster]

you get the EFI hardware and head from an 18RGUE and you have a fuel-injected engine. Why bother frabricating when the goods already exist?

ra40Celica: megasquirt doesn't do sequential injection - it can drive 2 banks of injectors (also known as batch fire). seqential is only really useful for engines with massive injectors or direct injection. MS can do waste-spark ignition and with a cam trigger aswell as crank trigger you can do sequential CoP ignition.

If you're contemplating doing EFI on an 18R (non-crossflow) engine - dont - it's a friggin PITA (and i should know as i'm trying to get the thing to run tonight).

[The Witzl]

Chuck is correct, dont bother fabricating unless you HAVE TO.... your performance and your wallet will hate you for it.

All you need from an 18R-GEU is:

the Intake manifold + plenum (they separate into two parts),
fuel rail,
EFI thermostat housing (yes it's different to the carby one)
.... and the rest you can make up from generic parts


Have a look at these pics..... they show a few progress steps when i did the 18R-GEU efi conversion on my 18R-G. You can see all the parts you need here.

.... EFI thermostat housing comparison



..... lower half of intake manifold and fuel rail



..... and here it is complete

[SillyCarS]

thanks

does anyone see it unneccesary to inject this engine or just run a blow through set up, i thought i understood that injection meant better burn, more economy and more power if set up correctly, but have been told otherwise by this guy at adelaide jap

also once i get all these parts, how do i set up the ecu?

thanks again

[TA-022]

18RG + carb + boost = bad mkay

not worth the effort or cost to use carbs. dont get me wrong it can be done and can pull good power but in this day and age its not worth the hassle seriosly.

[The Witzl]

think of it this way....

a carby is a mechanical device, with virtually ZERO flexibility in terms of compensation for engine conditions. It takes air going thru it, and squirts some fuel based upon air velocity... blah blah blah

EFI on the otherhand is completely flexible and versatile. It is designed to take into consideration the variability of engine operating conditions and make self adjustments based upon those.


simple facts.... i went from 68kW to 72kW converting to EFI... same engine and everything else.

I can tell you now that the 72kW is a HELL OF A LOT FASTER than the carbied 68kW... because there is power everywhere else other that max rpm + wide open throttle

[chris_rg]

I run 18rgeu manifold and megasquirt. See my thread in members rides for more info.... link in sig.

Cheers
Chris

[river]

Hi,

EFI will not give you more power over a properly tuned set of carbs. I'm talking about the 18RG system here, where you effectively have a pot per cylinder.

EFI will give you better economy and less hassles with tuning. Tuning twin Solex properly is an art in itself and not cheap 'cos it needs to go to a master artist who is well versed in such things. Carbs are tempremental and unless they're kept tuned they can decrease your power, revs and fuel economy. And, when I say tuned properly, I mean properly - it's not something your average mechanic can do well, let alone hacking around with them yourself in your backyard.

If you had carbs and replaced them with EFI and got an increase in power it shows the carbs you had were not tuned properly.

Despite their antiquity and temperment, I like carbs and find they do a superb job when properly set-up. Not only do I like the sound of them, I think they look soooo cool and an 18RG doesn't look like the proper old school masterpiece that it is without some nice sidedraught carbs hanging off it.

seeyuzz
river

[chris_rg]

Hi,

EFI will not give you more power over a properly tuned set of carbs.

[snip]

seeyuzz
river

but i believe it will give you a fatter torque curve, and therefore a faster car.

anyways i think craigafleming has a sc14 to use

[The Witzl]

river..... what i was saying is that EFI will give you better power from idle to 5000rpm....

carbies will be the same or better above 5000rpm, if tuned properly. That is their only benefit, beside the cool noises.

[SillyCarS]

thanks alot guys your help is going a long way for me, i've spoken to a guy over here in adelaide and im going in to get the factory intake manifold early next week, that megasquirt does sound good too

cheers

[river]

Hi,

river..... what i was saying is that EFI will give you better power from idle to 5000rpm....

carbies will be the same or better above 5000rpm, if tuned properly. That is their only benefit, beside the cool noises.

Well, that stuffs me up, considering I haven't taken my engine above 3,500rpm since 1997.

seeyuzz
river

[o_man_ra23]

You have an 18RG and dont take it above 3500?? I never let mine go below that!!... 7000rpm is where the fun is at!

Cheers, Owen