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Location:
Perth
Registered:
July 2004
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4AGZE Overboost pulleys
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Tue, 18 January 2005 09:13
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I am currently in the process of modifying my AW11SC MR2, and the idea of an overboost pulley has crossed my mind more than once. But, I have access to a full CNC machining shop, so if there is enough interest I will make up a run of them for all the fans of this great engine...I will need some dimensions though, so if someone has some good drawings of a 12psi pulley, or can lend me one for a while, that would be great. Even a standard pulley will do, as long as I can work out the dimensoions needed for the belt in the new one.
Anyone interested? PM me or reply below 
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Location:
Adelaide, drift capital
Registered:
May 2004
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Re: 4AGZE Overboost pulleys
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Tue, 18 January 2005 09:32
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Overboost pulley? Never heard of it called that before! Only an overdrive pulley.
If you want to make your own...you'll prolly need to copy the design of a stock SC12 pulley and enlarge it and lighten it. If you want to make them well and ensure they're balanced at high rpm you'll need to design the pullies on a CAD program.
gluck mate. Happy GZEing 
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Location:
Perth
Registered:
July 2004
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Re: 4AGZE Overboost pulleys
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Tue, 18 January 2005 09:58
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Yeah, that was the idea. I have access to some of the latest Harding CNC gear, so acuraccy is not an issue. I really just need a stock pulley to copy off, and some interested buyers. No point writing the program for 2 pulleys.
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: 4AGZE Overboost pulleys
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Tue, 18 January 2005 14:47
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| 4ageeza wrote on Tue, 18 January 2005 19:32 |
If you want to make your own...you'll prolly need to copy the design of a stock SC12 pulley and enlarge it and lighten it.
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enlarging the s/c pulley will make less boost, not more.
Mullett, most people use a larger crank pulley to gain more boost from the sc12. the 165mm crank pulley by memory is the 12psi one.
there has been some smaller fixed pullies made for the sc12 before.
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Location:
Perth
Registered:
July 2004
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Re: 4AGZE Overboost pulleys
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Wed, 19 January 2005 00:32
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ok, I was actually under the idea of making one to suit the supercharger...I've been told that there isn't much you can put on the crank in the MR2 before you run out of room. Is that the case?
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 4AGZE Overboost pulleys
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Wed, 19 January 2005 01:18
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dont forget that your SC12 will melt at about 12000rpm...
you might have to look at the arrangement of the electromagnetic clutch too if you are going to put on a smaller SC pulley. One dude somewhere got some made up with a new clutch as part of the whole package.
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Location:
Girraween,Sydney
Registered:
September 2003
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Re: 4AGZE Overboost pulleys
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Wed, 19 January 2005 02:06
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Get an oversized NEVO crank pulley for it, this alows the extra boost once fitted & set up correctly, This is what i will be in the market for in the not to distant future,
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Location:
Sydney
Registered:
April 2004
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Re: 4AGZE Overboost pulleys
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Wed, 19 January 2005 08:16
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i have an aw11 4AGZE from a trueno.... same deal
i have a 175mm crank pulley, this is the largest that will fit, it almost doesn't, very tight
much easier to fit a larger crank pulley, as has been said the sc12 is on an electomagnetic clutch and it would b a good idea not to ignore this...
if a nevo pulley is too expensive u can press a ford falcon around ur standard crank pulley to get more boost
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Location:
cambo
Registered:
May 2002
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Re: 4AGZE Overboost pulleys
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Wed, 19 January 2005 09:47
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i know everyone advises against smaller s/c pulleys but im gonna add my 2c.
i had a smaller s/c pulley, it was solid mounted (no clutch) and with long intercooler piping and a largish cooler it made 15psi. now i know everyone says 'you cant boost it over 14psi' bla bla bla but most of these people dont have any first hand experience, they are just repeating crap they have heard. i ran this set up for only a little over a year, but the guy i bought it from ran it for about 5 years WITHOUT a FMIC, only a top mount under the bonnet with NO scoop. after all that time there was no trouble with the s/c, the car went fukin hard until the power dropped off after 6000rpm which is expected. maybe its bad for the s/c, but i reckon its worth it cause even if you had to replace it every 5 years, they only cost $200 so its not that much of a big deal.
i dont have the s/c pulley atm, im still wating for someone to give it back to me but when i get it ill measure it up, unless i can find the measurements before hand. i do still have pics somewhere however if wanted. if you want more info just ask.
sorry for the LONG post 
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: 4AGZE Overboost pulleys
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Wed, 19 January 2005 10:26
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i did run a 90mm fixed s/c pulley for 2 weeks (had it on loan)before i did my turbo conversion, the s/c produced boost faster and harder than my mates 175mm crank pulley'd aw11 4agze did. i liked it.  (i was getting about 12-13psi).
as ke35 - 4AGZE said 175mm is max size to fit for any 4agze crank pulley, and that is spose to put you up around the 14psi mark.
Mullett, making a fixed smalled s/c pulley wouldnt be too hard a job given you have access to a machining shop. people say it flogs the bearings out quicker, the s/c i had loan of had been running the 90mm fixed pulley for a couple years and still worked and sounded fine.
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Location:
Melbourne
Registered:
March 2004
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Re: 4AGZE Overboost pulleys
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Thu, 20 January 2005 10:23
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In the unlikely event of you actualy driving a non clutched s/c sedately, could it return fair economy.
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Location:
NSW
Registered:
June 2004
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Re: 4AGZE Overboost pulleys
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Thu, 20 January 2005 10:51
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yer whats the fuel economy like on them with th fixed pulley. I was going to put mine on this weekend but was hesitant on fuel economy and the clutch.
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Location:
Brisbane
Registered:
November 2002
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Re: 4AGZE Overboost pulleys
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Thu, 20 January 2005 11:39
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Keeping my presently standard MR2 4agz on boost draws as much as 27 litres/100km of 98 octane fuel.
I am going the crank pulley change route at the moment, and I investigated both crank and SC pulley options. A local perFOURmance shop originally did the crank pulley enhancement themselves using the ford pulley method. This method was not reccommended because the shrink process is quite costly.
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Location:
Brisbane
Registered:
November 2002
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 Re: 4AGZE Overboost pulleys
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Thu, 20 January 2005 11:42
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Oh, yeah...
SC Pulley changes can still be sourced in Japan, but it is a fussy process with me not speaking Japanese
So I have decided on a Diabolique all aluminium pulley from the US (if they reply to my emails...) because it costs a lowly $350 odd AUD for the kit and the lighter constuction will perfom better than the rivals.
It is supposedly rugged enough (endorsed by my mechanic) but may require a water pump pulley change (not included) to be sure of reliability.
Sorry 4 the sermon
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Location:
Brisbane
Registered:
November 2002
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: 4AGZE Overboost pulleys
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Thu, 20 January 2005 12:16
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cantr say i noticed any difference in the fuel consumption when i ran a fixed pulley compared to the clutched factory one.
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Location:
Brisbane
Registered:
November 2002
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Re: 4AGZE Overboost pulleys
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Thu, 20 January 2005 12:29
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27 l/100 km seems extreme, because I was wrong 
It was 19 l/100km and with that my 4agze is a little out of tune and the SC slips intermittently. But that was very hard driving
I raced it recently anyway and got 175km from a full tank (used 33.5 litres).
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Location:
Ireland
Registered:
May 2002
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 4AGZE Overboost pulleys
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Thu, 20 January 2005 15:23
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| Lucas777 wrote on Thu, 20 January 2005 20:29 |
27 l/100 km seems extreme, because I was wrong
It was 19 l/100km and with that my 4agze is a little out of tune and the SC slips intermittently. But that was very hard driving
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That still seems majorly extreme, thats about the same as a 300kW V8 in an 1800kg Commodore.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 4AGZE Overboost pulleys
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Thu, 20 January 2005 21:13
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yeah the speedchaser dude is who i was referring to with the smaller SC pulley + clutch.
EVOSTi - the reason you probably experienced no power above 6000rpm, is because at that speed you were probably running the SC above its rated RPM. Its ok if you dont do it too long, but yes can burn the fokker out pretty fast if done regularly.
Personally i would just smack a turbo on.
Who here gets over 110kW atw with just 10psi from a supercharger??
I have driven an AE82 AE101 map GZE, which i rated as pretty quick, and still do (i helped with this conversion). I always found the power to be pretty linear and have good torque down low.
Upon chucking the turbo on pimpboy, i have found a whole new meaning to torque. Even before i start making full boost, the turbo just seems to have more guts to it... and then rips it over the GZE.
P.S. anyone here with a GZE sprinter etc - i challenge you. 16th Feb. WSID. DO IT.
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Location:
cambo
Registered:
May 2002
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Re: 4AGZE Overboost pulleys
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Thu, 20 January 2005 23:47
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yeah i knew there was no power to be made after 6000rpm, i figured due to the fact at that rpm the s/c becomes more of a restriction than anything, especially when you take into account the beautifully made inlet manifold as standard 
for those interested the fuel economy with the fixed pulley was what i considered still quite good. i could easily get over 400 kms with half normal driving and half hard driving (in a sprinter).
and yes theres definately more power to be made with a turbo, i just miss the spontaneous power of the s/c. waiting for 5000rpm for anything to happen is a bit annoying but fun when you get there. 
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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