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Registered:
March 2005
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Decreasing intake restricion
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Thu, 28 July 2005 13:31
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Just wondering, if I theoretically make a y-pipe from my throttle body to two identical AFM's, where they are both OEM on a car and leave only one connected so the both have the same "resistamce" on the intake and increase the injector size by 100%. Would this decrease the intake resistance to allow the for increased HP while tricking the OEM fuel computer into thinking nothing is diffent?
Does anyone follow this mumbo jumbo?
Cheers
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Decreasing intake restricion
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Thu, 28 July 2005 13:45
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You'll find the cams are probably more of a restriction than the AFM
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Registered:
March 2005
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Re: Decreasing intake restricion
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Thu, 28 July 2005 13:52
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well i'm just yhinking the AMF will max out at not much more than 15psi on the GZ20. Boosting anymore than this will cause boost cut. So this was just an idea for eliminating the need for a full stand alone computer system.
Anyother opinions?
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Decreasing intake restricion
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Thu, 28 July 2005 13:58
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Its about 16ish PSI from memory, bit more for gen2
Boost cut defender will get that higher.
But Microtech will get it even higher, and make even more power.
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Location:
Lost in the K hole
Registered:
May 2002
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Re: Decreasing intake restricion
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Thu, 28 July 2005 14:50
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my advice - its wasted time thinking about this idea. stop now
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Location:
Brisbane
Registered:
June 2002
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Re: Decreasing intake restricion
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Thu, 28 July 2005 23:02
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get an aftermarket ecu with a map sensor, with a good tune you will never look back 
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Registered:
March 2005
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Re: Decreasing intake restricion
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Fri, 29 July 2005 04:24
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ok, i understand that getting a stand alone unit like microtec etc. etc. wil be able to produce more power. But statments like that are not answering my question, just tip toeing around it. Back to the original question, is my theory correct?
Also is my understanding that any aftermarket ECU is illegal, unless it is engineered to meet emmision levels?
Thanks again
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Location:
Canberra
Registered:
May 2002
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Re: Decreasing intake restricion
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Fri, 29 July 2005 04:28
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They did something on Autospeed a while ago about building an AFM bypass and having some electronic gizmo to fix the mixture, it could be worth subscribing to find what they did.
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Decreasing intake restricion
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Fri, 29 July 2005 04:29
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It depends on your state.
But I think you'll find messing with the emissions systems at all is illegal, and doing what you are planning would therefore be illegal.
But to answer your question no.
Not only have I never seen a Toyota with twin AFMs (unlike Nissans which can quite easily do it), but you'll never get them to be equal.
Especially if they are flaptype ones.
The spring tension could differ by a minute amount, and more or less air could be coming in than being metered, thus making the car run leaner or richer respectively.
And I doubt the ECU has the resolution for half the fuel at idle, so it would run pigrich.
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Decreasing intake restricion
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Fri, 29 July 2005 04:31
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Oh, and lastly, if ed_ma61 says its a waste of time and to stop thinking about it, it means that he himself has spent a few hours thinking about the idea, only to come to the conclusion that its not possible, or not worth the hassle.
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Registered:
March 2005
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Re: Decreasing intake restricion
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Fri, 29 July 2005 04:36
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yeah thats principly where we(me and a mate) got the idea. You add an extra intake pipe which goes straight to the throttle body. THen obtain an electronic fuel adjuster from jaycar. It has like 128 mapping points available where you can add or decrease fuel. The idea is you put an 02 sensor in your exhasut, drive around for a couple hours to "re-map" the fuel curve so to speak. The only bad thing we could think about this arrangement is that when you are say high in the reverange and there is alot of fuel being consumed, one mapping point may not cover enough of the rev range and towards the top of that point, it may lean out and cause problems.
So the idea of creating twice the intake volume and same restriction, with twice the injector size wouldnt cause this problem.
The only problem with that is idleing may not be so smooth with the bigger injectors.
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Registered:
March 2005
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Location:
tallahassee FL usOFa
Registered:
May 2002
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Re: Decreasing intake restricion
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Fri, 29 July 2005 17:21
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NO, of course not.
stop thinking before your head explodes from usless crap.
just leave the connector between the TB & AFM loose - same effect.
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