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Location:
Adelaide
Registered:
August 2003
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Location:
Brisbane
Registered:
February 2003
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Re: Supercharging 18rc
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Thu, 25 September 2003 13:53
 
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instead of carbi's have your thought of EFI? you've gotta build a custom intake manifold anyway, so you might as well put the injector ports in at the same time? (i wish i did)
would two charade carbi's be enough once you're at serious boost - i think there's a mazda carbi for early turbo RXs?
i thought the GSR sigmas/cordia started out as throttle-body injection before going port injection? (anyone?)
blowoff valves should work for either S/C or Turbo? definately essential if the T?B is after the compressor. Choice is really whether you want the rice-sounds or not?
but an 18R? you'll need to do some decent head work to reduce compression ration - mine runs at 7.4:1 after serious machining in combustion chambers in head - but is still very prone to pinging/detonation. you'll have to seriously modify the dizzi (or replace it with some kind of ECU).
Charles.
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Location:
Brisbane
Registered:
May 2002
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Re: Supercharging 18rc
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Fri, 26 September 2003 00:40
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| blacks wrote on Thu, 25 September 2003 23:20 |
Also will a normal blow off valve flow enough to vent enough pressure on throttle off conditions so damage will not occur to the throttle linages and/or blow off the induction piping.
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I doubt it. BOV's aren't designed for that sort of thing, and besides, this will make your engine horrendously inefficient as it will be wasting energy trying to compress air all the time which just gets blasted out the BOV. The only sensible way to do it is to mount the carby before the supercharger - that way you don't have to use a special carby, anything will do the trick.
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Location:
adelaide
Registered:
August 2003
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Re: Supercharging 18rc
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Fri, 26 September 2003 11:56
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I agree with norbie...easier to use such thru'.....but then you can't use an intercooler seeing it has fuel mixed with the air..one back fire and it goes bang!!
I haven't seen one, but if you want blow thru' setup,there is the suggestion that the whole carby is enclosed in a sealed enclosure as part of the induction system so the pressurised air acts on the entire carby and there is no need for fancy sealing/o rings etc.
good luck, kevin.
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Location:
melb
Registered:
May 2002
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Re: Supercharging 18rc
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Fri, 26 September 2003 14:03
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hey charles - how good does your turbo 18r go.
reckon it was worth the effort? ie would you do it again or go the import motor? - seems a lot of money and effort.
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Location:
Brisbane
Registered:
February 2003
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Re: Supercharging 18rc
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Sat, 27 September 2003 07:38
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hi chrisss
| chrisss wrote on Sat, 27 September 2003 00:03 |
hey charles - how good does your turbo 18r go.
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when in tune, clean air-cleaner, cool air, new oil - a lot of fun! serious improvement on the 18RC even at minimal rpm and is much smoother engine.
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reckon it was worth the effort? ie would you do it again or go the import motor? - seems a lot of money and effort.
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i think it was worth the effort as it was just part of the whole car rebuilding process - at the time i didn't know of my options but it made sense to retain as much factory standard stuff to minimise any engineering hassles.
for the next car, i'll start with EFI/electrics first and go newer engine - as there's not much more i can do to the 18RC without making it undrivable in street conditions. (note: i already have a 1G-GTE waiting for revamping before transplanting)
As for the money thing - it was too much for the post-install setup - but i didn't have anything to compare it too at the time. Had i known about toyomods back then, i would have rebuilt a newer engine that had a turbo.
It makes sense to start with a turbo motor - but it also makes sense to start by rebuilding your target engine if you don't know it's history. This way you get your big ticket items (like the rebuild, paint job) out of the way before you start driving it. Regardless of which motor i chose, i wanted something that would last a fair amount of abuse. So i guess i was prepared to pay for durability.
other important thing: one of my driving factors for spending (or was it wasting?) all this cash was to have an every-day driver that was a sleeper. I've got no turbo badges or 5inch cannon muffler or wanker stickers - it might sound like a turbo cordia, but visually it's just a repainted RA40 4-banger.
anyway, you try to buy a newly painted, no rust, 5sp, new/rebuilt 4-cyl turbo, no engineering defects, hatchback, new front/rear glass, new w/seals all round, new rubber, exhaust, new shocks, new seats, revamped/recoloured interior, trimming, etc... and doesn't require any significant work to get it driving and registered legally? and not pay under $10-12k?
plus it's great fun to drive - it's like a big RA23 with more room and better ventilation 
Charles.
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Supercharging 18rc
