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Location:
adelaide
Registered:
May 2002
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 RA28 RC -> R-GEU conversion
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Sun, 22 September 2002 06:32
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G'day, sorry but i am in need of some technical expertise.
i am seriously thinking of doing the conversion soon, 18R-c to 18R-geu, because im sick of seeing a mates celica blitz and mine go shit slow in comparison. Thats usually what starts it..
I am just curious, i know the rg is almost identical to the rc, in terms of the block and running gear they use, and the main differences are the yamaha head, and higher compression pistons etc. But what would i need to fit an EFI 18RGeu into my fairly stock RA28?
*It will sit on the same mounts... so thats ok.
*It will bolt up to the same w50... so thats ok.
*The radiator will fit because its identical... so thats ok.
*I have a stock fuel pump and rails for the single-cam carby. This is inadequate for an efi engine, so what setup will i need from the tank to the injectors?? Can i just have one pump from the boot or in the bay?? it will run completely stock so theres no need for huge pumps. But it needs morelike 60psi than 4.
*It has a computer whereas the rc had screws on the carby. haha.
it is all complete but are there any known difficulties in setting up the computer with efi and with fuel ???
What i am really after is a definitive guide to RGeu swaps into RA carby celica's  I know it is considered a really simple conversion but efi is always a bit of a hassle, so has anyone done this swap in the past or recently and feel like running through what they had to do? also any tips on setting up the computer/fuel/dizzy would be a huge help.
How come they have a dizzy if the computer controls the ignition and timing? what is the point of pointless dizzy? no pun intended, i bet its been said many many times.
I was hoping there would be a tech article on the conversion because it has to be more common than a 1G series swap??? but ive searched the forum and nothing came up. Anywho thanks anyone and to all who can give some input. One last thing does anyone know the weight of a complete 18R-geu? this is important to me so i can ship the engine to Adelaide!!!
Cheers heaps, again and again
Guy
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BlackRA28
-SLEEK77-
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Location:
Perth
Registered:
September 2002
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Re: RA28 RC -> R-GEU conversion
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Sun, 22 September 2002 06:56
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hey man about the conversion. I did it in my ra40 celica. its pretty easy as far as gettin the engine in goes, all just bolts up and clears everything. I used an aftermarket computer (Injec) i dunno wot you r plannin on using or wot you already have. I have the standard computer but i couldnt get hold of a full wiring harness so i went aftermarket. I proggrammed it all myself and got it runnin pretty well, fuel pumps were a problem for ages and fuel pressure regulators were also a problem, seeing though i couldnt afford to spend any money on aftermarket setups. My computer only runs the fuel side of things and which is why ya keep the dizzy. I made a dodgy surge tank out of a spagetti tin which fixed that problem. So how much do ya actually have already E.G. have ya got a motor yet, or harness, computer etc. i have got a complete setup which im prolly gonna sell if you are intersted. (complete setup being, Programmable computer, Surge tank, manifold with injectors etc, throttle pos sensor, h/p efi pump, relays, resistor pack for injectors etc.) If you are keen we might be able to sort something out. Or if ya have any questions let me know.
Matty
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Location:
adelaide
Registered:
May 2002
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Re: RA28 RC -> R-GEU conversion
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Sun, 22 September 2002 07:37
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nah i dont have a motor yet, cheers heaps tho man anyway. I am aloways on the lookout for good buys and if i DID have the 18RG i probably would be interested in that gear of yours. I am currently investigating an efi 18rg in sydney for sale on this forum. It apparently has the stock computer and harness complete.
I was just need to know what sort of fuel setup over the stock carby-feeder i need. If i can just replace this pump with a single high-pressure pump, or if i have to have a surge tank aswell, + regulator etc.. ?? or where the best place to mount all these is i.e. bay or boot??? and if diameter of fuel lines are a problem.
Cheers,
Guy
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BlackRA28 - 18rc hillclimber
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Location:
Brisbane
Registered:
May 2002
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Re: RA28 RC -> R-GEU conversion
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Sun, 22 September 2002 08:11
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I put an 18R-GU in my RA23 a few years ago and later converted it to EFI. The fuel side of things is pretty straightforward - I got an external EFI pump from a JE Camira at the wreckers (same as a VL pump) and mounted it in the boot on the driver side in that little hole where you keep tools and stuff. From there it just pumps straight into the factory fuel lines via an EFI fuel filter. Of course it's not a bad idea to run a surge tank, but I haven't got around to that yet.
Definitely don't mount your pump in the engine bay, this isn't especially safe and probably wouldn't work anyway as EFI pumps don't like to "suck" fuel from a long distance away. In fact it's important to mount the fuel pump such that the inlet is lower than the tank so that the fuel can gravity feed into the pump - that's why I mounted my pump in that hole in the side of the boot.
Don't worry about the fuel lines, they're big enough for way more power than a stock 18R-G can provide. 
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Location:
Rocky Mountains, Canada
Registered:
May 2002
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Re: RA28 RC -> R-GEU conversion
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Sun, 22 September 2002 14:33
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No surge tank is ok if you always keep your tank over 1/4 way full.
Go under 1/4 and youll fry the EFI fuel pump cos itll overheat by not having any fuel running through it during cornering.
So basically, if you like curvy hills driving, a surge tank is a must.
You two guys that have done the conversion... what did you do about fuel return lines?
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Location:
adelaide
Registered:
May 2002
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Re: RA28 RC -> R-GEU conversion
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Sun, 22 September 2002 15:24
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Yeh no joke, thanks for the advice, i LIVE for hills driving so i dont want that happening. Yeh my mates been having hell fuel troubles lately with his 74 lancer starion turbo, it gets hell stutters sometimes and he is running a surge tank, pump and regulator. but the problems almost fixed, he has a new pump now.
So, just for the knowlege, how does a surge tank work? i guess this is how roughly, correct me please: you run the stock(4psi) fuel pump into the top of the surge tank which fills and fuel comes out the bottom into your Hi/pres. (VL/camira)fuel pump, keeping plenty of fuel on hand for said pump with gravity feeding it from the surge tank. Then the fuel goes on through a filter then your stock rail/s(?) and to the injectors??
What is this about a return line/s? i have heard you need them. is this 100% essential/do i need one? do they just run back to the surge tank with un-needed fuel from injector rail?
Where does the computer come in to all this or is that just connected to control the injectors? Also are there any differences in starter motors/ignition systems for the 18RC and efi 18RGs? I need to know if im going to need new elec. ignition? or does the computer hook up to the starter aswell.
Cheers again, you guys are a great help. this information is gold to me 
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BlackRA28
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Location:
Brisbane
Registered:
May 2002
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Re: RA28 RC -> R-GEU conversion
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Mon, 23 September 2002 01:40
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I use the factory return line which goes straight back to the tank. You'd run this to the surge tank if you had one, then the overflow from the surge tank would go back to the main tank.
The computer does not directly control the fuel system, however there is a switch in the airflow meter which triggers the fuel pump. This means the fuel pump is only switched on when the engine is actually drawing air through the airflow meter. It's sort of a safety measure - if you crash the engine will stop and the fuel pump will switch off straight away.
The starter works the same way as the original engine, however the computer requires a signal on the STA pin which connects to the starter switch so it knows when you're trying to crank the engine. The ignition system is independant of the EFI system, but later model 18R-G's use an electronic pickup in place of the breaker points found in 18R-C's. This means you'll need a different type of coil with ignitor attached, but you can grab one of them from the wreckers easily enough (I got mine from an EFI Corona).
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