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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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 18rc + Supercharger????
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Mon, 29 July 2002 22:40
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Well guys can a 18RC Engine handle a supercharger? if so what type, how easy are they to install and can it just be connected to the existing webers? how much would i be looking at to do this and what sort of power boost would i get?
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Location:
Brisbane
Registered:
May 2002
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Short answers
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Mon, 29 July 2002 23:54
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1. Maybe
2. Depends what you want
3. Hard
4. Not really
5. Lots
6. About 25-50%
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Registered:
May 2002
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Re: 18rc + Supercharger????
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Mon, 29 July 2002 23:58
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Dude, just drop in a 1GGTE, it is real easy to instal and goes like mad, revs it's nut off and sounds awesome. Also, it runs like your mums car. I.E. always starts first time, idles fine in the cold, uses shit-all fuel and you don't have any webber-associated hassles.
Nothing else is worthwhile when it comes to old celicas..
Tim
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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Re: 18rc + Supercharger????
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Tue, 30 July 2002 00:06
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but i like my engine, starts first time weather its cold or hot, idles smooth has great top end grunt and heaps of troque never have to down change for any hills, only problem is it likes the fuel and doesn't have much power in low revs, if i was to do anything i was thinking of putting a RG head on mine as that way i don't have to change engine numbers or anything.
except big question is weather the extractors will still line up on a rg head but i'm pretty sure they can be supercharged
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Location:
Melbourne
Registered:
May 2002
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Re: 18rc + Supercharger????
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Tue, 30 July 2002 02:20
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supercharge it! if it blows up big deal only an 18R $1 a dozen!
the only problem i see is jeting the webbers for blow thru maybe "tricky"
Allan
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Registered:
May 2002
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Re: 18rc + Supercharger????
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Tue, 30 July 2002 04:26
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I've read on this forum, that the 18R bottom end may not be able to take the abuse an 18RG head would deal out to it, also, I think the 18RG heads would be crossflow wouldn't they?
Tim
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Location:
Brisbane
Registered:
May 2002
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Re: 18rc + Supercharger????
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Tue, 30 July 2002 04:40
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18R-C and 18R-G bottom ends are practically identical; there are minor differences between them, but they have no impact on strength.
The 18R-G cylinder head is cross-flow as it is a twincam design.
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Location:
Hobart, TAS
Registered:
July 2002
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Re: 18rc + Supercharger????
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Tue, 30 July 2002 09:40
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GIN51E please tell us how you got your 18RC to produce 111kw, or do you mean 111 horse power?
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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Re: 18rc + Supercharger????
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Tue, 30 July 2002 10:21
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ok well here is a list to what was done to it.
Bigger pistons,
Polished Head,
Ported,
Side draft 45mm double intake weber,
Mild Street Cam,
Oversized Valves,
and sports exhaust all the way through.
i think thats it.
it used to be a real machine, i remember driving it on my l's and hitting 2nd and hearing the tyres spin and the back squirm around a bit, but sadly its no longer like that, yeah it still goes pretty good but nothing like it used to as during my time of learning about cars and so forth i have messed up the timing and played around with the weber, (wish i had never touched the enigne) so now it hasn't got the power and responsiveness to what it used to have as the engine was dynotunned thats how they got those power readings taken at the flywheel now i just wish i could find someone who knew heaps about tunning webers and timing and get this thing back to its original state, but i just don't want to take it anywhere unless i know for certain they can get every bit of power out of the engine as possible. as i don't want to pay for something and get it back and find it could be better. even if any of you guys think you know a bit about tuning the timing and webers then feel free to come over and give me a hand, i'm sure you could get it better then i can and after we will have a few beers.
and yes 150hp (111Kw) at the flywheel
[Updated on: Tue, 30 July 2002 10:22]
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Location:
New Zealand
Registered:
May 2002
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Re: 18rc + Supercharger????
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Tue, 30 July 2002 10:29
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with the carb, you probably only played with the 2 screws, idle mixture and idle speed.
If so.. set idle at 800rpm, then set idle mixture to the point where the vacuum is greatest.... or the engine sounds smoothest (will be same point), then set idle again.
Timing.... use a timing light and set it at 12deg.
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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Re: 18rc + Supercharger????
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Tue, 30 July 2002 10:42
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yeah i re did the weber using stuff off this site like it was hard as you have to adjust two screws at the same time but i adjusted them till the engine revs got to the highest point and if i moved them anymore the engine revs would drop so i got it set to where they were at the highest revs then set idle to 900rpm, tried the timing but the timing light i was using couldn't get a good reading (think the light didn't have a quick enough flash) as the mark was always blured, and i need a timing light that has a advance adjustment on it as my engine only has a mark for TDC not for any advanced settings and i can't afford a timing light to expensive.
also there is another adjustment on my distributor which isn't in my workshop manual on one side you have the Vacuume thing and on the other theres a knob and depending on which way you adjust it it turns that metal plate which the rubbing block and points are attached to so i don't know what that does, is it just another way to adjust the timing advance or is it to adjust the mechanicle timing advance for when the revs get higher?
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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Re: 18rc + Supercharger????
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Tue, 30 July 2002 10:48
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but i also heard that theres a big difference to what the timing should be in a normal engine and a modified engine, as i have the cam and all that sort of stuff means to get max power i should adjust the timing more and also the timing in a normal car is set so it has good economical running in all conditions and situations where in a modified engine you can set the timing for max power for the desired rev range, i think it can get pretty complicated if you don't know anything about it ie ME!!!!
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Location:
Western Sydney
Registered:
May 2002
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Re: 18rc + Supercharger????
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Tue, 30 July 2002 11:15
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GIN51E, unless you're going to do all the work yourself, a supercharger on an 18R-C isn't worth the money. An 18R-G head swap is possible. You'll have lower compression than a standard 18R-G though, because the RG pistons have domed tops. I had this set-up with big cams and injection on my old Celica and while top end was bloody good, torque at low rpm was a bit dodgy. My new 18R-C Celica probably would have beat it to 60.
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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Re: 18rc + Supercharger????
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Tue, 30 July 2002 21:50
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thing is i don't want to just move to an 18-RG as when we got the engine the guy we got it off put a 18-Rg into his car and he said that the rc was just as quick or a bit quicker then the rg was, simply because of the amount of mods that had been done to the rc while the rg he put in was pretty close to standard except for the cams.
so if i moved to an rg i'd want to have a fully modifed one but i would never modify an engine myself as the cost involved would be huge.
i think first off i should just try and get this thing running to its peak then if i'm not happy with it i can start considering and engine change.
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Location:
Brisbane
Registered:
May 2002
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Re: 18rc + Supercharger????
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Wed, 31 July 2002 02:42
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| GIN51E wrote on Wed, 31 July 2002 7:50 AM |
but i would never modify an engine myself as the cost involved would be huge.
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And yet you're talking about supercharging an old carby engine? Dude, that definitely counts as a "modification" - and a pretty big one at that!
I see in your list of mods above that your engine has a "mild street cam". I wouldn't mind betting it has plenty of overlap, which means it's quite unsuitable for use with forced induction. In other words, you'd have to replace your cam to make it work properly with a supercharger. On top of that, your "bigger pistons" more than likely have a pretty high compression ratio, which once again is not going to work well with forced induction - especially since you can't run an intercooler.
To put it simply, it's going to take a lot of work and a LOT of money to make this happen, even if you do all the work yourself. And if you pay someone else to do it - ouch. Even off-the-shelf kits are anywhere from $5-10k installed, but a custom setup would cost way more than that. At the end of the day, an engine swap will cost less and work much better.
But hey, it's your money, do whatever you like...
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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Re: 18rc + Supercharger????
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Wed, 31 July 2002 06:21
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well for starters when i said i wouldn't modify an engine myself i'm talking about the internals of the engine, and the psi is 10 over standard in each cylinder. but i think i'll pass on supercharging it i was just interested to know if it could be done and how easy it would be now that i know what it involves i think i'll remain a N/A man until i get my GT4 in a million years time 
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