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Location:
Adelaide
Registered:
May 2002
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Custom Inlet Manifold (4AGTE)
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Sun, 11 August 2002 13:18
 
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I'd be really keen to put some effort into this one, do it to suit your cams/head work/turbo to make to most of the available torque, with a big arse plenum as well. I'd love to see some quad throttles there too (GTR style). I'd be using quad throttles if it weren't for that damned gas carb in the way on mine.. Go for it!
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Location:
Adelaide
Registered:
May 2002
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Re: Custom Inlet Manifold (4AGTE)
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Sun, 11 August 2002 13:59
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Problem is that I'll be using the stabdard AFM ECU for a while (unless someone hands me an SMC or M4). This eliminates the quad throttles for the moment (however it is part of my larger plan)
I understand when you say do it for the cams, head and turbo to give biggest spread of torque etc. But this seems very very hard given my lack of design/dyno software. Are there any 'rules of thumb' you know of?
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Registered:
June 2002
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Re: Custom Inlet Manifold (4AGTE)
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Sun, 11 August 2002 22:00
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Why would quad throttle bodies not run on a stock ECU??
As long as the AFM is still used and a TPS then the ECU won't know any different!!
If your running a MAP ECU then vacumn lines will need to be taken off each inlet after the throttle plate and all T-ed together before going to the MAP sensor.
Just my thoughts.
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Location:
Adelaide
Registered:
May 2002
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Re: Custom Inlet Manifold (4AGTE)
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Mon, 12 August 2002 00:15
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| E30-323ti wrote on Mon, 12 August 2002 7:30 AM |
Why would quad throttle bodies not run on a stock ECU??
As long as the AFM is still used and a TPS then the ECU won't know any different!!
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Actually there isnt really any reason that it shouldn't work. I was just thinking that the increased efficiency/flow ability may make it run a little on the lean side. But if all that air is being metered anyway, who cares, certainly not the stock ECU.
Now heres the other problem, matching quad throttles to a bigport head. I could probably make the adaptor, but wouldnt the throttle throats still be smaller than the inlet ports?
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Registered:
June 2002
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Re: Custom Inlet Manifold (4AGTE)
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Mon, 12 August 2002 03:28
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What size are the 20v quads?? What about Pulsar GTiR Quads??
I guess this is being done on the cheap (as all the best projects are!!) or there are heaps of places that sell Quad setups but they are around $1000.
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I supported Toymods
Location:
melbourne.victoria.austra...
Registered:
June 2002
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Re: Custom Inlet Manifold (4AGTE)
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Mon, 12 August 2002 07:13
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yes but you can get the 20v quads much cheaper than $1k and how hard is it to make up an adaptor plate - 16mm aluminium should do the trick - and be much cheaper than aftermarket too!!!
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Location:
Adelaide
Registered:
May 2002
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Re: Custom Inlet Manifold (4AGTE)
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Tue, 13 August 2002 01:05
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The 20 valve throttles are what i was thinking of, just the potential power robbing problem of the throttles being much smaller than the inlet ports.
But ba ha, A problem!
What about the stock ECU's idle control valve?
Unless the 20valve uses the same type of setup?
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Location:
Adelaide
Registered:
May 2002
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Toymods Board Member
I supported Toymods
Location:
Turramurra, Sydney.
Registered:
May 2002
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Re: Custom Inlet Manifold (4AGTE)
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Wed, 14 August 2002 09:18
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Have you read the article by rod on this subject in the articles section?
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Banned by his request
Location:
moved to tamworth
Registered:
July 2002
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Re: Custom Inlet Manifold (4AGTE)
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Wed, 14 August 2002 11:28
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plenum should be about double engine capacity. runner lenght works on the princable of short for top end and longer for bottom
end power. throttle bodys need to be picked for flow as to big and it will make the car very hard to drive under say 50km\h. best setup is two with a small one and a larger one in a staged formation or one that is perfectly sized. as with most things to do with cars its all a comprmise.
mick
have any questions ask away.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Custom Inlet Manifold (4AGTE)
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Wed, 14 August 2002 12:16
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Well I'd be tempted to use some mildish cams, headwork, carefully matched turbo and light flywheel etc. with a plenum of about 3.5 litres (purely guesswork!), quad throttles and short runners - show the world that its not only GTRs that can have 'that sound'. Sure its gonna me a bit flat down low, but 5-8500rpm, she'll be sensational. I'd also be tempted to use an AFM with this one on a decent computer (e.g. autronic), as MAP management might be a bit lumpy, and throttle position isn't really any way to map an engine, is it?
Of course thats if you can afford to spend big $ on it! Although remember the other little rule: It may seem like big $ now, but doing it to 'rediculous' lengths will stop you from spending even more later.
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