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Location:
Canberra
Registered:
May 2002
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18RG and superchargers
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Thu, 22 January 2004 08:43
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G'day people,
I Just got a few questions about supercharging a 18RG.
Now, I have an 18RGU that was converted to EFI (Haltech computer). Internals standard (to the best of my knowledge).
It runs fine.
Now my questions are:
Do I need to change the internal parts if I supercharge it? Are they already strong enough?
How difficult are they to fit?
What supercharger should I use?
I take it i would need bigger injectors???
What injectors do I choose?
How much is this all going to set me back?
cheers
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Location:
Perth
Registered:
May 2003
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Re: 18RG and superchargers
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Thu, 22 January 2004 09:43
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Do you know the compression of the engine?
You should be able to run 4 possibly up to 8PSI on the higher comp motor with proper tuning.
The standard internals are very strong provided you avoid detonation.
Not too difficult to fit, just time consuming. Pipe work and the bottom pulley are the hardest. I never got to finish mine as I put the supercharger onto another engine (2TG).
I was using an SC14 off of the 1GGZE, this is the best to use on the 18RG. Using the SC12 would mean spinning the supercharger too fast to get higher boost levels.
If it only has standard injectors then an upgrade would more than likely be required. The size of the new injectors depends on the HP you are aiming for. For a rough estimate, (HP @ flywheel x 5 x 1.2) = total cc of injectors (ie all four injectors).
Supercharger = $300
Injectors = $250-$300
Pipework (if done by yourself using mandrel bends) = $200 - $300 (?)
Intercooler =$100
Custom Pulley = $?
Bigger Fuel Pump = $120
Belt = $40
Tuning = $?
Hope this is helpful.
Tyron.
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Location:
Rocklea qld
Registered:
February 2003
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Re: 18RG and superchargers
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Thu, 22 January 2004 09:48
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i would be going the injecters out of a 7mgte they are about 440cc so should be right for the job. i was thinking the same thing as you but have found that its probably cheaper to turbo it.
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Location:
Brisbane
Registered:
May 2002
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Re: 18RG and superchargers
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Fri, 23 January 2004 01:09
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Yep, 7M 440's are a good choice, or if you're going nuts, 550's from a 13B turbo. Both of these will fit in the factory fuel rail; just make sure you get the loom plugs with them as they're different to the 18R-GEU ones.
Your 18R-GU will have 8.7:1 compression which should allow you to run a decent amount of boost with an intercooler and good tuning. I wouldn't go nuts with the standard internals though; for higher boost levels (say 10psi+) you should probably invest in forged pistons.
The SC14 is a good choice, but be aware this is a positive displacement supercharger, which means you'll have to re-arrange your inlet so the throttle body is before the blower. You'll also need to make the factory bypass system work, otherwise the blower will wear out quickly; it's not designed to be constantly engaged.
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Location:
Brisbane
Registered:
October 2002
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Re: 18RG and superchargers
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Fri, 23 January 2004 07:43
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| Norbie wrote on Fri, 23 January 2004 11:09 |
The SC14 is a good choice, but be aware this is a positive displacement supercharger, which means you'll have to re-arrange your inlet so the throttle body is before the blower. You'll also need to make the factory bypass system work, otherwise the blower will wear out quickly; it's not designed to be constantly engaged.
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what if he had a map sensor
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Location:
Canberra
Registered:
May 2002
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Re: 18RG and superchargers
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Fri, 23 January 2004 10:47
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cool, thanks guys.
Does anyone know of any power output figures for this kind of setup?
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Location:
Adelaide
Registered:
September 2003
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Location:
Brisbane
Registered:
May 2002
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Re: 18RG and superchargers
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Sat, 24 January 2004 04:12
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| philmelvin wrote on Fri, 23 January 2004 17:43 |
what if he had a map sensor
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What does that have to do with anything?
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Location:
Brisbane
Registered:
October 2002
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Re: 18RG and superchargers
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Sat, 24 January 2004 04:22
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oops, my bad i thought u said AFM, not throttle body, just ignore me 
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Location:
Christchurch, New Zealand
Registered:
March 2004
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Re: 18RG and superchargers
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Wed, 25 August 2004 00:28
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| Norbie wrote on Fri, 23 January 2004 14:09 |
The SC14 is a good choice, but be aware this is a positive displacement supercharger, which means you'll have to re-arrange your inlet so the throttle body is before the blower. You'll also need to make the factory bypass system work, otherwise the blower will wear out quickly; it's not designed to be constantly engaged.
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Hi Norbie,
I jsut got may sc14 and im in the planning process of figuring out how to make it work, now i was just wondering what you thought about running the standard throttle body and a large (or maybe 2 small bosch style) BOV's rather than putting hte throttle before the charger??
Also trying to search the wreckers for some obscure bracket that may bolt to the head for mounting, any ideas?
Cheers
Logan
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Location:
Brisbane
Registered:
May 2002
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Re: 18RG and superchargers
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Wed, 25 August 2004 01:36
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| SRacin wrote on Wed, 25 August 2004 10:28 |
I jsut got may sc14 and im in the planning process of figuring out how to make it work, now i was just wondering what you thought about running the standard throttle body and a large (or maybe 2 small bosch style) BOV's rather than putting hte throttle before the charger??
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As I've mentioned in several other threads, I think this is a terrible idea. 99% of the time you'll be driving around with several hundred CFM of air blasting out of your BOV(s), which will make your engine tremendously inefficient, promote premature wear of the blower, and make your car sound like a steam train. I don't understand why people are so averse to the idea of moving the throttle body, it's really easy to do!
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Also trying to search the wreckers for some obscure bracket that may bolt to the head for mounting, any ideas?
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Are we talking 18R-G here? Try to get your hands on a factory aircon pump bracket; with a few mods it should be just about ideal.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 18RG and superchargers
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Wed, 25 August 2004 04:15
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YOU CANNOT HAVE MY BRACKETS!!
You can only run this dual BOV system in a VL.
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Location:
Christchurch, New Zealand
Registered:
March 2004
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Re: 18RG and superchargers
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Wed, 25 August 2004 09:01
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Hi,
Will try find an AC bracket.
The reason i didnt want to move the throttle body is basically a space issue. I was thinking along the lines of positioning the blower such that the inlet faces up and outlet downwards. Its basically the only way i can make it fit. Anyway with doing it this way i could use the factory outlet elbow and then fabricate a little alloy box to hold a panel filter right on top of the blower, as there is not enough room for the elbow and the bonnet.
Yes moving the throttle would be easy with some mild fabrication, so i may have to go stare at the engine bay for another couple of hours and figure out how i can make it all fit...
should have played more tetris back in the day....
Logan
P.S. yea 18rgeu in an rt40 corona running MAP based link computer.
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Location:
SA
Registered:
July 2004
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Re: 18RG and superchargers
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Wed, 25 August 2004 13:13
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I am currently putting this setup on my 18rgeu, ive rebuilt the whole eng with a fully prepped bottom end, balanced crank, rod & piston assembly, ARP rod bolts, 40thou flat top pistons with chrome rings. The head has been ported, manifolds portmatched, and has reground cams. Ive set the comp ratio to 7:0.1 and plan to screw in around 16 pound intercooled, with a haltech to run it all. The only thing it really lacks is forged pistons but at $1100 cast items had to do. Ive really got no idea of how much power it will pump out as i can really compare it to anything! Its a few months away yet but i cant wait. I will keep you posted.
Cheerzz,
Brendo.
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Location:
Christchurch, New Zealand
Registered:
March 2004
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Re: 18RG and superchargers
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Wed, 25 August 2004 21:10
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sounds awesome!!
are you mounting it above the exhaust manifold?
I planned to make some custom pullys, using a toothed cambelt, just a matter of finding the right dimension pulleys and adapting them, would love to know how your going about it.
Cheers
Logan
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Location:
SA
Registered:
July 2004
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Re: 18RG and superchargers
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Thu, 26 August 2004 12:15
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I really wanted to mount it under the intake manifold as having that much weight so high up on the exhaust side is not ideal handling wise. There is the heat factor aswell, but there just isnt enough room on the intake side which is a real bummer. As for the pulleys im going to machine a recess on the inside of the crank pulley, and then machine an ally serpentine pulley which will spigot into the recess, and then drill and tap into both to hold it in place. I will have to put an idler in somewhere to get around the waterpump but ill work that out later. Im yet to work out what diameter i need to make the pulley for the amount of boost i want, but hopefully it wont have to be too big.
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Location:
Christchurch, New Zealand
Registered:
March 2004
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Re: 18RG and superchargers
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Thu, 26 August 2004 22:29
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sounds good, i plan to run one belt for everything, (alt, w/p and blower) A mate has suggested to go check out austin princess's as apparentyl they use a toothed belt for the water pump and alt etc. The other thing is trying to figure out how to change the pully on the sc14 to a toothed design and still keep the clutch...If i stare at it long enough im sure i'll think of something..lol
Cheers
Logan
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