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Discussion Starter #1
I'm (half) looking at upgrading my map sensor so that I can (safely) apply more boost, the sensor on my car is a 1.5bar boost (2.5 absolute) + a small overboost region, ideally I'd like to get a 2bar boost sensor with the same characteristics. Also it would be ideal if it was the same form factor so it could just plug in ...

http://www.bosch.com.au/content/language1/downloads/Map_Sensor_Technical_Specification.pdf gives details of various bosch map sensors of which I believe that 0 281 002 487 is my current version (although


Having a bit of a look around the 156 20v map sensor is of the same form factor but seems to have a different part number, does anyone know the specifications for this?


Any other options??
 

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Discussion Starter #2
actualy just had bit more of a look and the map sensor for the 20v seems to be the same as for the 159/brera :( so looks like that isn't an option
 

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Discussion Starter #6
The Portland Group....... oh dear!!

They have a reputation for crap MAF sensors...

It was just the first one that came out of a search tbh ... I'd probably get it from my local auto factors (that way it is easier to take it back!!!!)
 

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According to the ePer, 20V 156 uses the same MAP sensor as 16V, which is 3bar MAP - Alfa no. 55206797 - Bosch 0 281 002 845.

If you swap it for some wider range one, you will need a remap modifying MAP linearisation map for correct functionality.

Update: Have checked ECU of 166 2.4JTD 20V - it also has 3bar MAP
 

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Discussion Starter #9
According to the ePer, 20V 156 uses the same MAP sensor as 16V, which is 3bar MAP - Alfa no. 55206797 - Bosch 0 281 002 845.

If you swap it for some wider range one, you will a remap modifying MAP linearisation map.

Looking at it they are a slightly different shape to the 10v (see P37 of the link I posted, my MAP sensor (10v) is drawing 2 and I think the 20v is drawing 3), also the 20v has a temperature sensor but that can obviously just be ignored for my purposes.

Luckily the part that gets "stuck" into the engine is the same diameter, looking at the pictures the gap between the sensor and the screw attachment seems to be about the same so hopefully it should just about fit ...


... oh and yes I know I'll have to get my MAP modified
 

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Doesn't matter. These form factors are interchangeable. You only may need to buy and exchange the connector as well, as the older ones are 3pin MAPs, while these newer are 4pin TMAPs. I did it on my car (having 3.5bar TMAP now).
 

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Discussion Starter #11
Doesn't matter. These form factors are interchangeable. You only may need to buy and exchange the connector as well, as the older ones are 3pin MAPs, while these newer are 4pin TMAPs. I did it on my car (having 3.5bar TMAP now).

:thumbs: Brilliant thanks alot (although I don't think I'll risk 3.5bar!!! ... yet)
 

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@ Yan.ko - could you tell us a little more about that upgrade yan.ko? I have an old 2002 10v and I'm currently about to embark on MAP, MAF and EGR cleaning / replacement so if there is a chance to replace the MAP with one that will increase my cars umph ;) I would be interested to look into that further. Are we saying that changing the MAP sensor and getting the ECU remaped is all thats needed, or are there extra bits that will have to be done?

Is changing to the 4 pin TMAP connector easy enough?

And what would be the performance difference and lifespan effect vs just a remap?

Thanks
 

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Hi Martin, it's just a wider range sensor, it won't give you any more oomph itself.

Btw changing to 4pin TMAP is easy, if you are familliar with soldering and capable to get needed plug and accessories.
 

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I did thes years ago on my old 2.4 10v.

A long time ago, but from memory you will need to find a suitable connector for the 3 bar MAP, I think some vauxhall connectors will fit, then solder into loom.

Would I do it again, NO!

I thought when I did it, it could be mapped in. Well it can, if you have extensive knowledge - as in you worked for Alfa in the ECU calibration/tuning dept.

All the remappers can do is alter the fuelling and boost maps, perhaps a little more, but I felt for this to really work, it needed much more.

If I was doing it again, I would ditch the standard ECU and put in an aftermarket, I don't know if DTA, Emarald etc make ECU's for diesels. If you could get one, you would have a real flying machine, but the standard ECU just wouldn't take that (250bhp+) level of performance, it was way too far from its designed paramaters.

Would I tune the balls off a diesel again, YES, if it was a BMW all alloy engine.
I would go down a similar route to Alpina, turbo, injectors etc, but keep it light so it could make the turn for the next corner, something a heavyweight diesel struggles to do - ever driven a 535d (twin turbo BMW)?
 

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Hi, did you read previous posts? Yes, these are 3bar ones, no they will not fit directly - those newer one are 4pin TMAP, while older are 3pin MAP.
 

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I did thes years ago on my old 2.4 10v.

A long time ago, but from memory you will need to find a suitable connector for the 3 bar MAP, I think some vauxhall connectors will fit, then solder into loom.

Would I do it again, NO!

I thought when I did it, it could be mapped in. Well it can, if you have extensive knowledge - as in you worked for Alfa in the ECU calibration/tuning dept.

All the remappers can do is alter the fuelling and boost maps, perhaps a little more, but I felt for this to really work, it needed much more.

If I was doing it again, I would ditch the standard ECU and put in an aftermarket, I don't know if DTA, Emarald etc make ECU's for diesels. If you could get one, you would have a real flying machine, but the standard ECU just wouldn't take that (250bhp+) level of performance, it was way too far from its designed paramaters.

Would I tune the balls off a diesel again, YES, if it was a BMW all alloy engine.
I would go down a similar route to Alpina, turbo, injectors etc, but keep it light so it could make the turn for the next corner, something a heavyweight diesel struggles to do - ever driven a 535d (twin turbo BMW)?
Replacing a 2.5 bar map for a 3 bar one and adjusting the software accordingly isn't rocket science. Using an aftermarket ecu is much, much more work because you have to fill everything in rather than making mods to existing maps.

Btw a simple method to use the 3 bar map is with separate connectors like I did with my 147 JTD 8v.
 

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