3 Bar Map Sensor - Genuine Marelli
#1
I've found that life I needed.. It's HERE!!
Thread Starter
Join Date: May 2004
Location: Surrey
Posts: 1,197
Likes: 0
Received 0 Likes
on
0 Posts
3 Bar Map Sensor - Genuine Marelli
Re: My Matt Lewis Motorsport topic i am still looking for a new 3 bar map sensor.
I have phoned up all the shops I can think of and all are out of stock.
One of the shops told me that marelli are going to make 1000 more then thats it.
Has anyone got a new 3 bar for sale or know any shops that have them in stock.
Thanks
Ollie
I have phoned up all the shops I can think of and all are out of stock.
One of the shops told me that marelli are going to make 1000 more then thats it.
Has anyone got a new 3 bar for sale or know any shops that have them in stock.
Thanks
Ollie
#5
RS & ST Parts Specialists
iTrader: (2)
Re: My Matt Lewis Motorsport topic i am still looking for a new 3 bar map sensor.
I have phoned up all the shops I can think of and all are out of stock.
One of the shops told me that marelli are going to make 1000 more then thats it.
Has anyone got a new 3 bar for sale or know any shops that have them in stock.
Thanks
Ollie
I have phoned up all the shops I can think of and all are out of stock.
One of the shops told me that marelli are going to make 1000 more then thats it.
Has anyone got a new 3 bar for sale or know any shops that have them in stock.
Thanks
Ollie
Matt
#6
Seems like a genuine effort to put things right, and to be honest if my brother passed away the whole world could go to hell for as long as it took !!
Sorry to hear about your loss fella
Trending Topics
#12
PassionFords Creator
iTrader: (12)
5 bar
#14
Cossiemodo
Join Date: Jan 2006
Location: Liverpool
Posts: 3,075
Likes: 0
Received 0 Likes
on
0 Posts
#19
Testing the future
can the 5 bar and loom not be sold with a little box of tricks to match the output of the 5 bar to what a 3 bar chip would expect to see? then it would be a drop in replacement
#22
PassionFord Post Troll
#24
PassionFord Post Troll
#26
Colossal Pervert
Let's have a brief educational moment (for you):-
1. Analogue inputs on ECU's are 0-5v, typically.
2. An 8-bit ADC (analogue-to-digital converter) has 256 iterations of measurement, a 10-bit one has 1024 and a 12-bit one has 4096. Remember binary?
3. A 3 bar MAP sensor thus has the resolution of 0.17, 0.04 and 0.01 psi/bit respectively (depending on ADC).
4. A 5 bar MAP sensor has 0.28, 0.07 and 0.02 psi/bit.
5. Summary = 5 bar MAP sensor has less resolution than a 3 bar. It's basic stuff.
Have a nice day now
#27
Testing the future
and anyway, the resolution of the sensor is not an issue, it's the resolution of the ADC using that sensor just me being pedantic as usual
that could be overcome if a converter was used as i suggested anyway if it was entirely analogue
#28
PassionFord Post Troll
Oh dear, I thought you were a computer guy? Obviously not a very good one.
Let's have a brief educational moment (for you):-
1. Analogue inputs on ECU's are 0-5v, typically.
2. An 8-bit ADC (analogue-to-digital converter) has 256 iterations of measurement, a 10-bit one has 1024 and a 12-bit one has 4096. Remember binary?
3. A 3 bar MAP sensor thus has the resolution of 0.17, 0.04 and 0.01 psi/bit respectively (depending on ADC).
4. A 5 bar MAP sensor has 0.28, 0.07 and 0.02 psi/bit.
5. Summary = 5 bar MAP sensor has less resolution than a 3 bar. It's basic stuff.
Have a nice day now
Let's have a brief educational moment (for you):-
1. Analogue inputs on ECU's are 0-5v, typically.
2. An 8-bit ADC (analogue-to-digital converter) has 256 iterations of measurement, a 10-bit one has 1024 and a 12-bit one has 4096. Remember binary?
3. A 3 bar MAP sensor thus has the resolution of 0.17, 0.04 and 0.01 psi/bit respectively (depending on ADC).
4. A 5 bar MAP sensor has 0.28, 0.07 and 0.02 psi/bit.
5. Summary = 5 bar MAP sensor has less resolution than a 3 bar. It's basic stuff.
Have a nice day now
That makes perfect sense how ever running over 2bar of boost is needed to the map sensor needs to measure it.....
So its not the perfect fix but its better than not having the scope :P
And doesn't it depend on the type of 5bar that is used ?
#30
Colossal Pervert
No, as foreigneRS said, it depends on the ADC resolution.
And as I said, yes you only need a MAP sensor with greater range than 3 bar when your application warrants it. Otherwise, technically, you'd have less resolution (in every circumstance) if you ran one 'bigger' than necessary.
It is rather pedantic though
And as I said, yes you only need a MAP sensor with greater range than 3 bar when your application warrants it. Otherwise, technically, you'd have less resolution (in every circumstance) if you ran one 'bigger' than necessary.
It is rather pedantic though
#32
Colossal Pervert
Worse.. it's shocking how many people actually do this.. a 3 bar can only measure to 29 psi.. if you run more than this, then the ECU just sits at the 'top line' of the map.. So say you run 35 psi (which i've seen people do), then the top line has to be rich enough for this boost, but then when the engine is inbetween 29 and 35 psi it will be varying rich to super-rich.. Not a very good solution
#33
Did Someone Mention TUV
iTrader: (1)
Worse.. it's shocking how many people actually do this.. a 3 bar can only measure to 29 psi.. if you run more than this, then the ECU just sits at the 'top line' of the map.. So say you run 35 psi (which i've seen people do), then the top line has to be rich enough for this boost, but then when the engine is inbetween 29 and 35 psi it will be varying rich to super-rich.. Not a very good solution
see my sig for the boost i hit as a peak value lol.
#37
PassionFord Post Troll
#39
Colossal Pervert
No typo.. i'm sure people hack their way through the self-induced problem a gazillion cowboy ways, depending on the management being used.. Personally i'd just use the appropriate sensor for the application
#40
Colossal Pervert
On the money.. (in theory)... I have no idea what your respective tuner would do to overcome the problem, or would I like to suggest otherwise that you actually have a 'problem'