MAP/EMAP VE tune with ITB's

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trentreznor321
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MAP/EMAP VE tune with ITB's

Postby trentreznor321 » Tue Jan 22, 2019 9:17 am

In the process of building an RB26 right now, and was wondering how well a MAP/EMAP VE based tune would work with ITB's and a large cam. would there be an improvement over a TPS based tune for this setup?

Mobne_s13
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Re: MAP/EMAP VE tune with ITB's

Postby Mobne_s13 » Sat Jan 26, 2019 10:59 pm

What I’ve learned ITB runs best with the fuelmap against TPS.

On my m3 engine I first tried it with map. It did work but the result was poor and when I change the tune to tps load it was like a day and night change in how the engine responded.

Hope this helps.

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HaltechMatthew
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Re: MAP/EMAP VE tune with ITB's

Postby HaltechMatthew » Mon Feb 04, 2019 2:19 pm

It will never work correctly. Use TPS/MAP to get a better result. It is the throttle opening that affects VE. MAP is a side effect of that.

inline6
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Re: MAP/EMAP VE tune with ITB's

Postby inline6 » Mon Feb 11, 2019 5:51 pm

HaltechMatthew wrote:It will never work correctly. Use TPS/MAP to get a better result. It is the throttle opening that affects VE. MAP is a side effect of that.


is the MAP using as baro sensor?

or is it better to create a small common plenum with vacuum hoses from each runner post throttle and use that with MAP correction?

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HaltechMatthew
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Re: MAP/EMAP VE tune with ITB's

Postby HaltechMatthew » Tue Feb 12, 2019 10:15 am

That is what I would do. Common small plenum for the MAP, but the main input is still TPS.

Mobne_s13
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Re: MAP/EMAP VE tune with ITB's

Postby Mobne_s13 » Wed Feb 13, 2019 6:07 am

inline6 wrote:
HaltechMatthew wrote:It will never work correctly. Use TPS/MAP to get a better result. It is the throttle opening that affects VE. MAP is a side effect of that.


is the MAP using as baro sensor?

or is it better to create a small common plenum with vacuum hoses from each runner post throttle and use that with MAP correction?



Google the bmw s54 engine.
It utilizes a common vacuum rail to get pretty stable map source.
As Matt says you run tps for the main load sensing. And the vacuum rail for map compensation for the turbo boost.

This works really good.

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Drwaffles
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Re: MAP/EMAP VE tune with ITB's

Postby Drwaffles » Wed Feb 13, 2019 11:31 pm

Mobne_s13 wrote:
Google the bmw s54 engine.
It utilizes a common vacuum rail to get pretty stable map source.
As Matt says you run tps for the main load sensing. And the vacuum rail for map compensation for the turbo boost.

This works really good.


Boost aside, that's what Triumph do. Join the three vac lines together and run through a longer line to the MAP.
Image


Interestingly.. Victory bikes (Two cylinder big V-twin with ITB's and a Visteon ECU)
Have the capability to use MAP or TPS (Or a blend of both depending on RPM or Throttle position)
The stock tune uses MAP mode and run really well, even with big cams.
Of course, boost would throw that all in the bin.. You'd have to use MAP
Image


The Subaru 'Carberry" rom (A heavily hacked Group-N WRC rom) had a blended fuel mode where you could blend MAF and MAP load source.
Image


But as the other guys said, use TPS load with MAP compensation.


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