MAP sensor help. Perrin 4 bar discontinued and Cobb Greenspeed killed tuning

JKN · 04-16-2025, 01:36 AM

Hello. I first was to start by saying I apologize if there is a thread out there that I have missed as my research game is weak lol. But I am in need of help.
My Perrin 4bar MAP sensor is failing. When idling in traffic at operating temps it randomly reads approx. 1psi. Also does it more often on hot starts. Car runs but not great. After driving it (cautiously) it goes back to normal. Now recently, a couple times it has spiked to like 38psi, once at idle and car stalled, another while at cruising speeds. Couple seconds later it was again fine.

So to the main question. Seeing as I need a new sensor and the Perrin one is discontinued. A new sensor will have a different calibration scaling that needs to be re-tuned. Now with that said, I am currently on a old Pro-tune using the cobb access port before they went all "green"...... So now I'm unsure how to re-tune it without spending a boat load of money for a standalone as all my emission devices are deleted.
Any help or insight on what's currently happening for solid tuning options are appreciated.

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benflynn · 04-23-2025, 07:22 AM

Get an aem 4 bar. I think all the non GM 4 bar map sensors seem to use the same settings. Just check the Cobb settings for the map and find one that matches. I think I recall them being the same.

And down with COBB!!!!!!!

benflynn · 04-23-2025, 07:22 AM

Perrin sensor not Cobb, same answer.

04-16-2025, 01:36 AM	#1
JKN Scooby Newbie Member#: 358611 Join Date: Jun 2013 Chapter/Region: W. Canada Location: Mission, BC, Canada Vehicle: 2010 WRX STI	MAP sensor help. Perrin 4 bar discontinued and Cobb Greenspeed killed tuning Hello. I first was to start by saying I apologize if there is a thread out there that I have missed as my research game is weak lol. But I am in need of help. My Perrin 4bar MAP sensor is failing. When idling in traffic at operating temps it randomly reads approx. 1psi. Also does it more often on hot starts. Car runs but not great. After driving it (cautiously) it goes back to normal. Now recently, a couple times it has spiked to like 38psi, once at idle and car stalled, another while at cruising speeds. Couple seconds later it was again fine. So to the main question. Seeing as I need a new sensor and the Perrin one is discontinued. A new sensor will have a different calibration scaling that needs to be re-tuned. Now with that said, I am currently on a old Pro-tune using the cobb access port before they went all "green"...... So now I'm unsure how to re-tune it without spending a boat load of money for a standalone as all my emission devices are deleted. Any help or insight on what's currently happening for solid tuning options are appreciated. * Registered users of the site do not see these ads.

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04-23-2025, 07:22 AM	#2
benflynn Scooby Specialist Member#: 515308 Join Date: Jun 2020	Get an aem 4 bar. I think all the non GM 4 bar map sensors seem to use the same settings. Just check the Cobb settings for the map and find one that matches. I think I recall them being the same. And down with COBB!!!!!!!