Author Topic: 1.5bar MAP sensor  (Read 10535 times)

Offline dani1326

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1.5bar MAP sensor
« on: December 08, 2010, 04:39:34 pm »
before i slap on my 17% smaller charger pulley, camshaft and custom map i need to make sure my MAP sensor is up to it ( how do i test if it is an uprated one?? )

sorry to be a pain but this is my first G40




Offline hayesey

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Re: 1.5bar MAP sensor
« Reply #1 on: December 08, 2010, 04:44:39 pm »
how much boost will you be running?  The only real way to tell what map sensor you have fitted is to open up the ECU and look at it.  I reckon it's highly unlikely to have been changed though unless the car was already running significantly more than 1 bar when you got it (and whatever has been done to it has been done properly).

Offline dani1326

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Re: 1.5bar MAP sensor
« Reply #2 on: December 08, 2010, 04:46:20 pm »
how much boost will you be running?  The only real way to tell what map sensor you have fitted is to open up the ECU and look at it.  I reckon it's highly unlikely to have been changed though unless the car was already running significantly more than 1 bar when you got it (and whatever has been done to it has been done properly).

its running 11psi atm but im unsure what it will be running with the 17% smaller charger pulley :/

Offline hayesey

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Re: 1.5bar MAP sensor
« Reply #3 on: December 08, 2010, 04:52:14 pm »
this is with an eaton charger isn't it?  I've no idea what boost to expect from that.  I'd probably just go for it and see what happens.  Changing the map sensor isn't a simple task as you'll need a different ecu remap to suit and given the spec, you'll be unlikely to find anything suitable off the shelf so would need a custom remap.

Offline dani1326

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Re: 1.5bar MAP sensor
« Reply #4 on: December 08, 2010, 04:54:58 pm »
this is with an eaton charger isn't it?  I've no idea what boost to expect from that.  I'd probably just go for it and see what happens.  Changing the map sensor isn't a simple task as you'll need a different ecu remap to suit and given the spec, you'll be unlikely to find anything suitable off the shelf so would need a custom remap.

yeh its an eaton pal.... its already having a custom map :) .... iv just txt the past owner he said he thinks it was a 2bar map sensor cos its running 1bar atm... but ant 11psi not even a bar?? but he is unsure eva

Offline grungeisdead

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Re: 1.5bar MAP sensor
« Reply #5 on: December 08, 2010, 05:11:27 pm »
14 psi is a bar. well its actually 14.5

pm a few eaton owners (Vwmk3jon, giorgio, lance) and find out what they were running, to give you some idea of what to expect!

whats your full spec list from the previous owner?

Offline G40supercharged

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Re: 1.5bar MAP sensor
« Reply #6 on: December 08, 2010, 05:12:41 pm »
11 PSI is less than a bar but the absolute pressure is 25.5 PSI (11 PSI more than the normal 14.5 PSI/1 bar atmospheric pressure). The standard pressure sensor is 2 bar absolute i.e. it works up to 1 bar above atmospheric pressure (about 14.5 PSI on a boost gauge). You need to fit a 2.5 or 3 bar sensor if you are intending to run more than 1 bar of boost.

At a rough guess (as I don't really know how Eatons respond to spinning faster) you will get 117/100 x 25.5 = 29.8 PSI i.e. just over 15 PSI of boost so you should be just on the limit of the standard sensor.

Offline Justin14100

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Re: 1.5bar MAP sensor
« Reply #7 on: December 08, 2010, 05:13:16 pm »
this is with an eaton charger isn't it?  I've no idea what boost to expect from that.  I'd probably just go for it and see what happens.  Changing the map sensor isn't a simple task as you'll need a different ecu remap to suit and given the spec, you'll be unlikely to find anything suitable off the shelf so would need a custom remap.

yeh its an eaton pal.... its already having a custom map :) .... iv just txt the past owner he said he thinks it was a 2bar map sensor cos its running 1bar atm... but ant 11psi not even a bar?? but he is unsure eva
Im sure its a standard ECU cause its running the standard chip yes?
1 bar (or 2 absolute if you include the 1 bar or the earths atmosphere) is standard

Offline dani1326

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Re: 1.5bar MAP sensor
« Reply #8 on: December 08, 2010, 05:18:11 pm »
most of that went over my head lol.... iv just took some pics of my ECU it looks standrd to me :/

Offline dani1326

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Re: 1.5bar MAP sensor
« Reply #9 on: December 08, 2010, 05:19:39 pm »
14 psi is a bar. well its actually 14.5

pm a few eaton owners (Vwmk3jon, giorgio, lance) and find out what they were running, to give you some idea of what to expect!

whats your full spec list from the previous owner?

from what i no its just a full engine rubuild ( standard ) and the eaton slaped on...

Offline dani1326

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Re: 1.5bar MAP sensor
« Reply #10 on: December 08, 2010, 05:21:41 pm »





I believe thats totally standard 200kpa??

Offline hayesey

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Re: 1.5bar MAP sensor
« Reply #11 on: December 08, 2010, 05:26:36 pm »
map sensors are normally rated in absolute pressure.  Where zero is actually a vacuum.  When people talk about boost pressure they normally use relative pressure where zero is actually atmospheric pressure (1 bar or 14.5 psi at sea level).  The Bosch map sensors (and possibly all map sensors) are rated in kPa (kilo-pascal) where 100 kPa is near enough to 1 bar as damn it. The standard G40 map sensor is 200kPa which means it'll read to 100kPa relative pressure (above atmospheric).  So that's what you'd describe as 1 bar on a boost gauge.  

So if you are going to increase boost pressure much above 1 bar then you really need to change the map sensor for something that doesn't top out at 1 bar.  The most common one is a 250kPa sensor which will read to ~1.5 bar boost pressure.  It's not as simple as just changing the sensor though as the entire ecu map has to be altered to take into account the different scale from a different sensor.

Offline hayesey

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Re: 1.5bar MAP sensor
« Reply #12 on: December 08, 2010, 05:27:23 pm »
yeah thats the standard 200kPa map sensor. It's maxed out at 1 bar boost.

Offline dani1326

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Re: 1.5bar MAP sensor
« Reply #13 on: December 08, 2010, 05:32:48 pm »
yeah thats the standard 200kPa map sensor. It's maxed out at 1 bar boost.

ill get a map sensor ordered then..... its getting a custom map done by jabba anyway but with the cam, smaller pulley and 4 branch i had to make sure the map sensor is up the the job..

im just on the mini forum trying to find out that boost the eaton will run with a 17% smaller pulley so i no what map sensor to get

Offline dani1326

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Re: 1.5bar MAP sensor
« Reply #14 on: December 08, 2010, 05:46:13 pm »
No luck with finding out how much boost ill be running :/ im sure the largest map sensor is 1.5bar so ill go with that....

how hard are they to fit??? i found this and it looks pretty simple http://www.crea2.de/map-sensor%20g40.pdf
« Last Edit: December 08, 2010, 05:52:42 pm by dani1326 »