Ecutek stock map and maf question

[jflogerzi]

Can ecutek calculate boost without a gauge? Trying to determine if I have just a vacuum leak or also a boost leak at the actuator on the sprintex 210 which would be causing both a vacuum and boost leak.

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[kev0]

Just curious, does your car make a hissing sound or sound of air releasing when you turn your car off?

[jflogerzi]

Originally Posted by kev0

Just curious, does your car make a hissing sound or sound of air releasing when you turn your car off?

No not that I can hear.

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[86TOYO2k17]

Originally Posted by jflogerzi

Can ecutek calculate boost without a gauge? Trying to determine if I have just a vacuum leak or also a boost leak at the actuator on the sprintex 210 which would be causing both a vacuum and boost leak.

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Yes, but stock MAP only reads to 5.6psi. And if you have intercooler you cant use aftermarket. Its easy to 1/8th npt tap the map sensor plate screw a 1/8npt to hose barb and run hose through firewall to a gauge.

I use a mechanical boost gauge with a vent pod and just cut the end of the rubber “nipple” sticking out of the firewall behind brake booster so didn’t need to drill anything and it creates a perfect seal, hose runs out and up to vent perfectly and since its mechanical don’t have to deal with wires unless you want a back light.

But if you don’t know what your boost was it’ll be hard to tell unless it’s drastic.

[steve99]

Log monifold pressure
Ignition on , engine stopped should read 1 bar ie amospheric pressure
At idle should be about 0.3-0.4 bar if it closer to 1 bar you likely have intake side leak


As above the stock map sensor only reads to about 6psi above atmospheric so max manifold pressure you will see is about 1.4 bar ie 0.4 bar boost.

[jflogerzi]

Originally Posted by steve99

Log monifold pressure
Ignition on , engine stopped should read 1 bar ie amospheric pressure
At idle should be about 0.3-0.4 bar if it closer to 1 bar you likely have intake side leak


As above the stock map sensor only reads to about 6psi above atmospheric so max manifold pressure you will see is about 1.4 bar ie 0.4 bar boost.

Hey Steve did both and each was spot on. manifold absolute pressure off was 13.9-14psi and at idle I was seeing about 4.8-5psi which about where it should be. Can there still be a vacuum leak with in the SC itself causing the high LTFT positive?

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[steve99]

Originally Posted by jflogerzi

Hey Steve did both and each was spot on. If idle is good there can still be a vacuum leak correct?

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Leak could srill be present but it would be small

[jflogerzi]

Would it be enough to cause LTFTs to Max out pretty quickly at idle? @steve99

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[steve99]

Originally Posted by jflogerzi

Would it be enough to cause LTFTs to Max out pretty quickly at idle? @steve99

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If the ltft go high positive at idle but ok at say 3000 it can be exhaust leak

[kev0]

Originally Posted by steve99

If the ltft go high positive at idle but ok at say 3000 it can be exhaust leak

What about high positive during cold starts, but ok when engine warms up? I cant figure out what could be possibly causing LTFT to shoot up ONLY during cold starts.. I'm lost at to where to start.

[jflogerzi]

Originally Posted by steve99

If the ltft go high positive at idle but ok at say 3000 it can be exhaust leak

Yes this is what I am seeing. Header looks good. So the leak could be at the header? With my old UEL header I was seeing the same issue and I had an exhaust shop put on my new JDL EL header while on the lift welding in resonator. Could it be a bad/failing O2 sensor?

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[steve99]

Originally Posted by kev0

What about high positive during cold starts, but ok when engine warms up? I cant figure out what could be possibly causing LTFT to shoot up ONLY during cold starts.. I'm lost at to where to start.

There are lots of offsets to maf andcfuelng during cold start so this can effect fuel trims, if its normal after car warmed up dont worry

[steve99]

Originally Posted by jflogerzi

Yes this is what I am seeing. Header looks good. So the leak could be at the header? With my old UEL header I was seeing the same issue and I had an exhaust shop put on my new JDL EL header while on the lift welding in resonator. Could it be a bad/failing O2 sensor?

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Poswible ifs o2 sensor but if it was you would think fuel trims would be bad all the time

[jflogerzi]

Originally Posted by steve99

Poswible ifs o2 sensor but if it was you would think fuel trims would be bad all the time

That's what I was wondering and thought the same thing. I really need to get it on the Dyno. If it's close in whp then I know it's not a boost leak.

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