Toymods Car Club Inc: Tech & Conversions => 18RG Carby to EFI Conversion

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mcnicol
Occasional Poster

Location:
Canberra
Registered:
September 2003

18RG Carby to EFI Conversion	Mon, 06 September 2004 13:01

Anyone able to tell me: What do I need to do the conversion? What is it all likely to cost? Where can I get it all from? Are there any other differences difference between an 18RG and 18RGEU? [Report message to a moderator]

Norbie
Forums Junkie

Location:
Brisbane
Registered:
May 2002

Re: 18RG Carby to EFI Conversion	Mon, 06 September 2004 23:09

This has been covered before so if you take the time to do a search you'll find everything you need to know. In short though, you'll need the manifold/plenum and associated gear, thermostat housing, EFI fuel pump, EFI-spec fuel hose and fittings, and of course an ECU of some description (either the original one or aftermarket). As for where to get it, keep your eye on the forsale section, this sort of thing pops up occasionally. [Report message to a moderator]

RT104GT
Regular

Location:
Western Victoria
Registered:
September 2004

Re: 18RG Carby to EFI Conversion	Tue, 07 September 2004 06:56

18RG 9.7:1 18RGEU 8.5:1 compression ratios differ. Also some inlet manifolds differ there are short no water heated, there are long throw water heated to suit the carby models depending on which model the engine came from. RA40's had very little space to the strut towers so I guess the manifold is shorter than the RT series Corona which did not use struts so the manifold had a longer throw. have seen different balance tubes used also some integral and some external again over 10 years there were a lot of different 18RG's engines developed for three series of celica GT's and sundry Corona Carina models..There is a link to I think is davos pages with every combination of every model of every Toyota engine ever made. If I can find it I'll post it. This is not the one but its a start.. 18RG DOHC 2 chain ?? 1990 140 ?? 89 80 9.7:1 18RGEU DOHC 2 chain ?? 1990 120 ?? 89 80 8.3:1 18RGR DOHC 2 chain ?? 1990 130 ?? 89 80 9.2:1 18RGRU DOHC 2 chain ?? 1990 125 ?? 89 80 9.2:1 18RGU DOHC 2 chain ?? 1990 120 ?? 89 80 8.7:1 http://www.toyota-mods.org/engines.txt [Updated on: Tue, 07 September 2004 07:08] [Report message to a moderator]

Location:
townsville NQLD
Registered:
February 2004

Re: 18RG Carby to EFI Conversion	Tue, 07 September 2004 09:04

talk to a guy, not sure of his user name but type in 'megasquirt' into the search forum thing [Report message to a moderator]

mcnicol
Occasional Poster

Location:
Canberra
Registered:
September 2003

Re: 18RG Carby to EFI Conversion	Tue, 07 September 2004 13:22

Does the conversion from carby on a high compression engine to efi, need any other issues considered if the efi gear was designed for a lower compression engine? [Report message to a moderator]

mcnicol
Occasional Poster

Location:
Canberra
Registered:
September 2003

Re: 18RG Carby to EFI Conversion	Tue, 07 September 2004 13:24

I've also read some posts on ULP vs leaded and PULP. Does the compression issue come into this inthe converswion to efi? [Report message to a moderator]

Norbie
Forums Junkie

Location:
Brisbane
Registered:
May 2002

Re: 18RG Carby to EFI Conversion	Tue, 07 September 2004 13:40

1. The early EFI systems like this are very flexible; they don't have fuel maps like modern EFI, in fact they're much like an electronic carby. The system will work fine with higher compression after a good tune on a chassis dyno. 2. These engines are generally happier on high-octane fuel, like Optimax or BP Ultimate. [Report message to a moderator]

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