Who would be interesting in a ITB setup? or Just a new intake manifold
#1
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Who would be interesting in a ITB setup? or Just a new intake manifold
As title says, Who would be interested in an ITB setup or a new Intake manifold?
The big question - What are you willing to pay?
Keeping in mind -
- That the throttle bodies are about $800 for a set of 4. (Australian made and very high quality)
- Plenum may be made from Carbon fiber. OR multi piece cnc machined aluminium.
This is just a feeler as not everyone is willing to spend the money on one, and if it's worth my time trying to make a user friendly one, while i think about making one for my self that will not be user friendly.
The big question - What are you willing to pay?
Keeping in mind -
- That the throttle bodies are about $800 for a set of 4. (Australian made and very high quality)
- Plenum may be made from Carbon fiber. OR multi piece cnc machined aluminium.
This is just a feeler as not everyone is willing to spend the money on one, and if it's worth my time trying to make a user friendly one, while i think about making one for my self that will not be user friendly.
#2
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I might be interested in one dependent on cost. The one Milledge put together was pretty expensive in the end.
Also have a question on boost control with an ITB set up, as the sensor pick ups are usually down stream of the throttle body and with an ITB I would assume it would be upstream. Does this have an impact on the pressure reading.
Also have a question on boost control with an ITB set up, as the sensor pick ups are usually down stream of the throttle body and with an ITB I would assume it would be upstream. Does this have an impact on the pressure reading.
#3
Rainman
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Not to throw a wet blanket on this thread, we all love engine ****, but why the effort/expense of making custom throttles when there are thousands of OEM throttle designs available to choose from, that can be made to fit?
Since you're making a custom manifold anyways you can adjust the runners to fit TB spacing and stuff.
Since you're making a custom manifold anyways you can adjust the runners to fit TB spacing and stuff.
#4
The MAP signal is always measured after the throttle, regardless how many there are.
#5
As title says, Who would be interested in an ITB setup or a new Intake manifold?
The big question - What are you willing to pay?
Keeping in mind -
- That the throttle bodies are about $800 for a set of 4. (Australian made and very high quality)
- Plenum may be made from Carbon fiber. OR multi piece cnc machined aluminium.
This is just a feeler as not everyone is willing to spend the money on one, and if it's worth my time trying to make a user friendly one, while i think about making one for my self that will not be user friendly.
The big question - What are you willing to pay?
Keeping in mind -
- That the throttle bodies are about $800 for a set of 4. (Australian made and very high quality)
- Plenum may be made from Carbon fiber. OR multi piece cnc machined aluminium.
This is just a feeler as not everyone is willing to spend the money on one, and if it's worth my time trying to make a user friendly one, while i think about making one for my self that will not be user friendly.
#6
#7
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https://rennlist.com/forums/944-turb...28-4v-itb.html
Itb turbo tuning is tricky, I was advised against it by few tuners.
http://www.motec.com/forum/viewtopic.php?f=39&t=401
Itb turbo tuning is tricky, I was advised against it by few tuners.
http://www.motec.com/forum/viewtopic.php?f=39&t=401
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#8
Three Wheelin'
It is maybe advised by those who cannot tune it It takes of course more effort compared to plain jane speed density but it works and is definitely worth it.
Have done this and the engine behaviour is absolutely phenomenal, imagine a bike and then there's rush of torque by turbo. Instant throttle response.
Pure speed density sucks with ITB's, it has to be hybrid load (both MAP and TPS are mixed to hybrid load vs rpm). Now you have VE table and then you still need secondary RPM vs MAP fuel table to compensate for different load, then it works perfect in every weather and condition (provided that it is tuned in first place of course).
And boost reference can be taken both before and after throttle, for example VEMS has selection which one is it.
Have done this and the engine behaviour is absolutely phenomenal, imagine a bike and then there's rush of torque by turbo. Instant throttle response.
Pure speed density sucks with ITB's, it has to be hybrid load (both MAP and TPS are mixed to hybrid load vs rpm). Now you have VE table and then you still need secondary RPM vs MAP fuel table to compensate for different load, then it works perfect in every weather and condition (provided that it is tuned in first place of course).
And boost reference can be taken both before and after throttle, for example VEMS has selection which one is it.
#9
Thanks ya I have seen that thread but no photos of an installed setup
https://rennlist.com/forums/944-turb...28-4v-itb.html
Itb turbo tuning is tricky, I was advised against it by few tuners.
http://www.motec.com/forum/viewtopic.php?f=39&t=401
Itb turbo tuning is tricky, I was advised against it by few tuners.
http://www.motec.com/forum/viewtopic.php?f=39&t=401
#10
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Not to throw a wet blanket on this thread, we all love engine ****, but why the effort/expense of making custom throttles when there are thousands of OEM throttle designs available to choose from, that can be made to fit?
Since you're making a custom manifold anyways you can adjust the runners to fit TB spacing and stuff.
Since you're making a custom manifold anyways you can adjust the runners to fit TB spacing and stuff.
Reason is so the runners can be all equal and symmetrical.
I might be interested in one dependent on cost. The one Milledge put together was pretty expensive in the end.
Also have a question on boost control with an ITB set up, as the sensor pick ups are usually down stream of the throttle body and with an ITB I would assume it would be upstream. Does this have an impact on the pressure reading.
Also have a question on boost control with an ITB set up, as the sensor pick ups are usually down stream of the throttle body and with an ITB I would assume it would be upstream. Does this have an impact on the pressure reading.
I haven't made anything, Couple of drawings on solidworks of plenums designs.
This is where i decide if i want to make something for everyone to use almost bolt up, or for my self where i'll make it work for me only.
It is maybe advised by those who cannot tune it It takes of course more effort compared to plain jane speed density but it works and is definitely worth it.
Have done this and the engine behaviour is absolutely phenomenal, imagine a bike and then there's rush of torque by turbo. Instant throttle response.
Pure speed density sucks with ITB's, it has to be hybrid load (both MAP and TPS are mixed to hybrid load vs rpm). Now you have VE table and then you still need secondary RPM vs MAP fuel table to compensate for different load, then it works perfect in every weather and condition (provided that it is tuned in first place of course).
And boost reference can be taken both before and after throttle, for example VEMS has selection which one is it.
Have done this and the engine behaviour is absolutely phenomenal, imagine a bike and then there's rush of torque by turbo. Instant throttle response.
Pure speed density sucks with ITB's, it has to be hybrid load (both MAP and TPS are mixed to hybrid load vs rpm). Now you have VE table and then you still need secondary RPM vs MAP fuel table to compensate for different load, then it works perfect in every weather and condition (provided that it is tuned in first place of course).
And boost reference can be taken both before and after throttle, for example VEMS has selection which one is it.
#11
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I won't be using my 43mm busa itbs so if anybody wants them I've posted them fs in other thread.
Last edited by Voith; 11-30-2016 at 10:17 PM.
#12
Three Wheelin'
For a street car I would not probably bother, I had a dilemma when I had to decide which way to go with my 2.5 16v turbo. Mostly because of space constraint and the urge to get it finally running.
But if the car needs to see track occasionally then ITB+turbo is something I wouldn't want to miss
But if the car needs to see track occasionally then ITB+turbo is something I wouldn't want to miss