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Old Feb 27, 2026 | 01:06 PM
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Boost fooler

The truck is running really well. I recently took it from here in the Houston, Tx area up to Winchester, Ky to get our youngest daughter another Audi Q5 TDI diesel...long story, but a woman high on drugs ran a red light and totaled her other Audi Q5 TDI diesel. The truck is setting the SES light when in the throttle good, but it does go away fairly soon. I recall pulling the code which is the over boost scenario. It is not de-fueling by any means as it pulls hard. I've researched having the boost foolers for both the physical side in the vacuum line off the spider and the electronic side at the plug to the sensor...they both seem to have postitives and negatives. So should I be worried about long term affects on the MAP sensor...or just leave it be?
 
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Old Feb 27, 2026 | 01:37 PM
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Riff raff ocr is the one to run imo.
 
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Old Feb 27, 2026 | 03:48 PM
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Tunes should be written to not need a boost fooler. I guess it would depend on when you got your tunes
I run the Riffraff one just as a precaution and I think I got it a long while back when running old tunes.
 
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Old Feb 27, 2026 | 07:29 PM
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I’ve never had any defueling but have seen the temporary SES depending on the tuner. My current PHP library tunes do not set the light. My truck has seen over 30psi for years and the MAP has lived so far.
 
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Old Feb 27, 2026 | 07:30 PM
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Originally Posted by Tpayne621
Riff raff ocr is the one to run imo.
...ocr?
 
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Old Feb 27, 2026 | 07:33 PM
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Originally Posted by RacinJasonWV
I’ve never had any defueling but have seen the temporary SES depending on the tuner. My current PHP library tunes do not set the light. My truck has seen over 30psi for years and the MAP has lived so far.
The tune I have on my trucks don't defuel when boost goes higher than 23psi, but it will set the SES light for a short time. I don't get into it alot, just worried about the MAP sensor being able to take it in the long run...
 
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Old Feb 27, 2026 | 07:40 PM
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Originally Posted by bwguardian
...ocr?
Overboost Control Regulator

Originally Posted by bwguardian
The tune I have on my trucks don't defuel when boost goes higher than 23psi, but it will set the SES light for a short time. I don't get into it alot, just worried about the MAP sensor being able to take it in the long run...
The light annoys me even when it’s just temporary. Who’s tunes are you running?

My MAP has put up with all the abuse it’s been put through. Not sure if it may hurt it long term but it’s been taking it for over 10 years.
 
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Old Feb 28, 2026 | 05:51 AM
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Originally Posted by RacinJasonWV
Overboost Control Regulator



The light annoys me even when it’s just temporary. Who’s tunes are you running?

My MAP has put up with all the abuse it’s been put through. Not sure if it may hurt it long term but it’s been taking it for over 10 years.
Good to know...I will probably just live with the light. I have the old Superchips 1700 and1705 box programmers...they just seem to work fine for me.
 
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Old Feb 28, 2026 | 09:04 AM
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i made a simple boost with a harbor freight mini air pressure regulator, some vacuum hose, and a few hose clamps. set the regulator to 16 psi and installed in the map sensor line.
 
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Old Feb 28, 2026 | 11:25 AM
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When I swapped to a T4 kit and a Borg Warner SXE turbo almost 10 years ago now, I installed a RiffRaff OCR at the same time.

OCR Link: https://www.riffraffdiesel.com/ocr-o...gulator-99-03/

Some tuners write the defueling out of the tunes, but not all do. At the time, it was 50% of the cost it is now and I considered it cheap insurance in order to keep the PCM happy if/when the boost exceeded the OEM threshold. Here we are almost 10 years later and the OCR and turbo are still performing great with OEM 267,000 mile injectors even up to 10,000 elevation towing a 5th wheel camper. Seeing at the price for the OCR is now $115, you may want to take a path similar to what Tom took and build your own.

Choose wisely and only choose once.
 
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