Zeitronix Boost Sensor

[TheHydro]

Hey guys. I’m running a Zeitroniz ZT-2 with a fuel pressure sensor, IAT2 sensor, and a 3.5 bar/50 psi map sensor to monitor boost on my ngauge. I’ve been doing some testing lately and noticed that with my gen 3 whipple with 3.625 pulley I am only seeing a max of 8psi and my 3.375 pulley a max of 11psi. My car runs great and does not have any vacuum issues. I am at 2500ft elevation so I should be seeing a lot more boost than that. I have heard that the zeitronix is very accurate and the fuel pressure and IAT2 read very accurate with my set up. My eco boost gauge is reading about the same max boost as my zeitronix sensor and I have read the eco boost gauge is off. I’m just looking to see if anyone has had accuracy issues with a zeitronix boost gauge or if anyone has experienced any boost leaks with a whipple.

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[turbofiveoh]

Have you done a vacuum leak test on the engine to determine if you have any vacuum leaks? A pinhole leak or two won't have any impact on how the car drives but will result in lost boost pressure.
Have you checked the bypass valve operation with a hand pump to make sure it is working properly at vacuum and closing all the way with no vacuum?
Is your car stock? If not, what mods have you done?

For reference I am at 2,400 ft and have a Stage 2 Gen 3 Whipple with a 3.75" pulley and stock size lower, Kooks 1 7/8" long tubes, Borla touring exhaust, and an Airflow Solutions ported lower and I am seeing 7-8 psi of boost on the ecoboost gauge vs the 11.5 psi advertised by Whipple.

 

[TheHydro]

I haven’t done a vacuum leak test but that will probably be next. I have a stage 2 Gen 3 whipple with mak cat deletes and fore fuel system.

 

[turbofiveoh]

Let us know what you find after you do the vacuum leak.

For anybody else in this situation that wants to check for leaks here a diagram for a smoke machine you can make for under $50 bucks...

 

[Jay-rod427]

It takes WAY more than a pinhole to lose measurable boost. You're talking over 1,000 cfm of air. No significant amount can get out of pinholes. As long as the zeitronix, and nguage are calibrated/formulated correctly I'm sure your readings are correct. Mods, Tune, DA can all play a big difference in the measured boost. A better comparison is the MAF and fuel corrections to tell you how much air is being moved. Boost reading is nothing more than the excess air NOT consumed by the engine.

OP what fuel setup do you have? If its regulated return style you can compare your base psi with no vacuum to the fuel pressure under boost and use the 1:1 reference to get a good idea on boost.

 

[turbofiveoh]

In my experience with previous cars small pinhole leaks have resulted in measurable pressure drop. For example, one car had two pinhole leaks (one from a poor weld and another from a tiny hole in a vacuum line). Once the leaks were fixed the car picked up 1.5 psi of boost. In any case, it is probably a good idea for the OP to make sure he doesn't have any vacuum leaks.

If he has a vacuum/boost leak, the FPR may not see the correct MAP for fueling based on the reference signal.

 

[TheHydro]

OP what fuel setup do you have? If its regulated return style you can compare your base psi with no vacuum to the fuel pressure under boost and use the 1:1 reference to get a good idea on boost.[/QUOTE]

You are right. When looking at my boost reference I am getting 13lbs on my 3.375 which sounds right. I guess at this point I need to find out why the map sensor is reading low

 

[Jay-rod427]

OP what fuel setup do you have? If its regulated return style you can compare your base psi with no vacuum to the fuel pressure under boost and use the 1:1 reference to get a good idea on boost.

You are right. When looking at my boost reference I am getting 13lbs on my 3.375 which sounds right. I guess at this point I need to find out why the map sensor is reading low[/QUOTE]


Good deal. Being able to log/watch fuel pressure is a nice backup when it’s referenced to boost/vacuum.

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