Request: ITB's on an FE head
Request: ITB's on an FE head
28-02-2020, 04:27 AM
sprinter2012 Can't help on the ITB side, but keep in mind that I drew up the 1G inlet layout on CAD for Stav, which may be useful if you need anything custom made...
That was for a -GTE head though, I would have thought the -FE would be different again!
28-02-2020, 04:28 AM
Any idea how things like vac lines and stuff work with ITB's?
Stix - thanks mate, will drop them an email.
el_bandido
28-02-2020, 04:28 AM #22that would be handy. I just need to find out exactly what needs designing in the first place if that makes sense. I'd rather be able to use something like a pilfered BMW set up instead of a full custom piece, as it would be a **** sight cheaper to simply make an adapter.
Any idea how things like vac lines and stuff work with ITB's?
Stix - thanks mate, will drop them an email.
28-02-2020, 04:30 AM
Idle control is a little difficult as you can't have an ICV. Ed did it on the UZ with a vacuum tank.
Edited 10-04-2013, 02:34 PM by toxo.
You can run things off an individual throttle, so in theory you could plumb the brake booster into cyl1, MAP sensor into cyl2 etc. Each throttle should read the same, so you could also have a vacuum distribution block. The 4A-GE runs TPS on cyl4.
Idle control is a little difficult as you can't have an ICV. Ed did it on the UZ with a vacuum tank.
28-02-2020, 04:54 AM
toxo You can run things off an individual throttle, so in theory you could plumb the brake booster into cyl1, MAP sensor into cyl2 etc. Each throttle should read the same, so you could also have a vacuum distribution block. The 4A-GE runs TPS on cyl1.
Idle control is a little difficult as you can't have an ICV. Ed did it on the UZ with a vacuum tank.
Could idle not be controlled by the management using the vacuum signal from the Map sensor?
toxo You can run things off an individual throttle, so in theory you could plumb the brake booster into cyl1, MAP sensor into cyl2 etc. Each throttle should read the same, so you could also have a vacuum distribution block. The 4A-GE runs TPS on cyl1.
Idle control is a little difficult as you can't have an ICV. Ed did it on the UZ with a vacuum tank.
Could idle not be controlled by the management using the vacuum signal from the Map sensor?
28-02-2020, 04:58 AM
Stix44 Could idle not be controlled by the management using the vacuum signal from the Map sensor?
Yes, but it's more complex than that. You still have an IDL switch in the throttle position sensor, so the ECU knows when the throttles are closed, but you have to open up a hole in to each throttle of the same size to make them idle. This can be controlled via management but because it has to happen after the throttle butterfly but before the head, you generally deal with it in the plate that fits the throttles to the head. You can't however use the stock idle control valve, or have a throttle motor that partially opens the throttles because then the IDL will be open and the ECU will think the engine is required to rev.
It's just another consideration in an already complex setup. Some throttles have an idle screw on them, which is fine as long as the screws are set the same on each (balanced like carbs). Toyota generally don't do that though, so 4A ITBs are unlikely to have that setup.
Edited 10-04-2013, 02:33 PM by toxo.
Stix44 Could idle not be controlled by the management using the vacuum signal from the Map sensor?
Yes, but it's more complex than that. You still have an IDL switch in the throttle position sensor, so the ECU knows when the throttles are closed, but you have to open up a hole in to each throttle of the same size to make them idle. This can be controlled via management but because it has to happen after the throttle butterfly but before the head, you generally deal with it in the plate that fits the throttles to the head. You can't however use the stock idle control valve, or have a throttle motor that partially opens the throttles because then the IDL will be open and the ECU will think the engine is required to rev.
It's just another consideration in an already complex setup. Some throttles have an idle screw on them, which is fine as long as the screws are set the same on each (balanced like carbs). Toyota generally don't do that though, so 4A ITBs are unlikely to have that setup.
28-02-2020, 05:38 AM
toxo That was for a -GTE head though, I would have thought the -FE would be different again!
Aah ye I think you're right, me and Stav just refered to is as the 1G when we were talking about it.
sprinter2012
28-02-2020, 05:38 AM #26toxo That was for a -GTE head though, I would have thought the -FE would be different again!
Aah ye I think you're right, me and Stav just refered to is as the 1G when we were talking about it.
28-02-2020, 06:31 AM
toxo Yes, but it's more complex than that. You still have an IDL switch in the throttle position sensor, so the ECU knows when the throttles are closed, but you have to open up a hole in to each throttle of the same size to make them idle. This can be controlled via management but because it has to happen after the throttle butterfly but before the head, you generally deal with it in the plate that fits the throttles to the head. You can't however use the stock idle control valve, or have a throttle motor that partially opens the throttles because then the IDL will be open and the ECU will think the engine is required to rev.
It's just another consideration in an already complex setup. Some throttles have an idle screw on them, which is fine as long as the screws are set the same on each (balanced like carbs). Toyota generally don't do that though, so 4A ITBs are unlikely to have that setup.
Ah I see! Could you just have a vacuum take off in the adapter plate that would go to an idle control valve?
An idle screw was my first thought but it seemed a little bit low tech! But I suppose if it works it works.
Edited 10-04-2013, 04:09 PM by S.
toxo Yes, but it's more complex than that. You still have an IDL switch in the throttle position sensor, so the ECU knows when the throttles are closed, but you have to open up a hole in to each throttle of the same size to make them idle. This can be controlled via management but because it has to happen after the throttle butterfly but before the head, you generally deal with it in the plate that fits the throttles to the head. You can't however use the stock idle control valve, or have a throttle motor that partially opens the throttles because then the IDL will be open and the ECU will think the engine is required to rev.
It's just another consideration in an already complex setup. Some throttles have an idle screw on them, which is fine as long as the screws are set the same on each (balanced like carbs). Toyota generally don't do that though, so 4A ITBs are unlikely to have that setup.
Ah I see! Could you just have a vacuum take off in the adapter plate that would go to an idle control valve?
An idle screw was my first thought but it seemed a little bit low tech! But I suppose if it works it works.
28-02-2020, 12:50 PM
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Sparkystav
28-02-2020, 12:50 PM #28Could you not fit a large icv like the Vauxhall ones? Then control it with a pwm from the ecu?
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