How accurate are the Bullydog GT tuners(boost) - Diesel Forum - TheDieselStop.com
'99 & up Upgrades and Aftermarket - 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

 
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post #1 of 4 (permalink) Old 02-19-2011, 05:55 PM Thread Starter
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How accurate are the Bullydog GT tuners(boost)

I have a 2000 F250 with a Bullydog GT tuner on it. I was just wondering how accurate will the boost readings be? I know it reads what the MAP sensor is seeing but im having issues with the guage reaching 15 psi then the check engine light comes on and the boost drops to 7-8 psi. Check engine light stays on for a minute or so and goes off. I pull the codes P0238 most the time and recently p1211.When the check engine light comes on and goes off it normally means it reaches 20 psi or more and the MAP sensor doesn't like it. But my guage only reads 15psi then falls....What gives cuz im stumped guys.!
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post #2 of 4 (permalink) Old 02-19-2011, 06:34 PM
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You might wanna run a hard lined boost gauge an see if that tuner is accurate my 7.3 has to see 20-25 psi before itll throw the light but mine does not drop boost... possible that its defueling???
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post #3 of 4 (permalink) Old 02-19-2011, 06:35 PM
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You're right - since it is reading your MAP sensor, it will only be as accurate as your MAP sensor is.

I have a ScanGaugeII and a ISSPRO boost gauge. They have identical values after subtracting about 14.5 off the ScanGauge for sea level pressure on the ScanGauge reading. That tells me my MAP sensor is accurate.

So the real issue is whether your MAP sensor is working correctly. Unfortunately, the only way to know that for sure is to compare it to a real boost gauge...

2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM, Full Force Stage 1 injectors

IF MY BODY IS EVER FOUND ON A JOGGING TRAIL JUST KNOW THAT I WAS MURDERED SOMEWHERE ELSE AND DUMPED THERE
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post #4 of 4 (permalink) Old 02-19-2011, 09:00 PM Thread Starter
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Yeah...i have read and read up on it...an they say that the P0238 can be a faulty wiring harness or faulty MAP sensor...but of course when i talk to my local dealership he says they don't hardly ever sell any MAP sensors and when it goes bad...it goes bad...thats what makes me think that since it hits 15psi then hits 7-8 that that its gotta be the MAP sensor shorting out or not reading it correctly when it reaches that high...but it exactly 15psi everytime when it does it...which is weird to me
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