This has always bugged me????

Why do people kick up such a fuss about cars running 28 psi+ on a 2 bar MAP sensor, as its out of its "Range"

BUT

You dont here people kicking up about people running 38 psi through a 3 bar MAP sensor, but isnt that out of the "Range" of that one too???

 

blinkers lol

 

dont think you quite mean that now do you

 

eerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr

Yep

 

38psi is out of range to with a 3bar map.

but how many people are boosting 38psi.....not many i think.

 

i wouldnt never run boost over the top of my map sensors range

 

I think there is a few out there that are

 

It's all down to how you map the car, such as using throttle multipliers as well as top line extrapolation. In an ideal wolrd we would'nt do this, but since not everything is ideal, there are ways around it that are very reliable.

I usually run anything up to around 6psi over the map sesnors range and find this causes no problems in terms of being able to map it. i.e. up to 23psi on a 2bar and 36psi on a 3bar.

 

Running over the sensors range has multiple effects....


1) NO OVERBOOST PROTECTION.
E.G. Say you run 35 psi on a 3bar that only measures 29 psi then suddenly your
wastgate jams open and you get 40 psi = engine melt no warning.

2) OVER RANGE BOOST WEARS THE SENSOR OUT
A three bar sensor is designed for two bar of boost. If you continuously keep
stressing the sensor by over pressure you are reducing its usefull working life.
3 bar sensors are fragile even when kept in range from my experience.

3) ECU IS PRETTY DUMB
If the ecu is mapped for the boost out of range say at 35 psi and the sensor tops
out at 29 psi, all is ok if you run 35 psi but drop the throttle back a bit then the
boost tails off, if the boost is 32 psi then it is still getting fuel for 35 psi causing a
rich mixture. Some ecu's can overcome this but not many !

On my car, I run a 5 bar bosch sensor which can measure over 45 psi boost.
My normall running boost is 34-36 psi which is fuelled correctly and I have an over
boost fuel cut at 38 psi.
Also, I have closed loop boost control as the sensor measures the boost through
out the whole range.

Hope all this makes sense..

 

 

I knew you was one Angus

 

ran 28 on esc 2.5 std MAP.

 

 

tiff whilst i see the point you're making, consider this...

what "excuse" can you use for not running a 3bar map sensor at that boost?

"i was too pikey to buy a 3bar" is the only one i can think of

for 2+bar boost applications there are a lot more "issues" to resolve when not using a std marelli 3bar map sensor... so a lot more reasons to do things this way :P

whereas you're just too much of a gypo to buy a proper map sensor

 

jim, he runs a 3 bar you tart, he never used to on his stage 1 though and that caused a few issue for others

 

oops, forgot he was on greys now

you know what i meant tho :P

 

Jim

You fookin TIT

 

i run 20psi on my 2 bar (thanks to Karl ), but i'll be having the stage 3 treatment next year with a 3 bar

 

but mike, WHY do you use a 2bar instead of a 3bar?

if you had a 3bar sitting there for free you'd use it yeah?

 

Jim,

I run the 2 bar as Karl set it up with that.

I will be running a 3 bar when i go stage 3.

remember, my 20psi is stage 1.

 

This has been done for YEARS, so what is your point actually ?

 

mike, i mean if you had a 3bar sitting there when you went to karl and its available to use if you wanted to at no extra expense... you'd have used it right?

 

Yes of course I would, but it seems as though Tiff thinks that running above 15psi or 30psi on each sensor respectively is something new .

I was running 19psi on my stage 1 chip before he was born .

 

mike, wrong mike, i was after the northern monkey

 

Jim,

Of course i would, but if i had a 3 bar, i'd probably have greens to accompany them, therefore i wouldnt of gone for a stage 1

 

I dont think that running high boost on thses is new at all, i was just wondering Mike

People are quick enough to tell others that a 2 bar wont work right, but nothing is said to people running a 3 bar above its range.

PS- Im 26, do your maths old man

 

Tony TS didnt say it was daft Jimboy...and i was running light blues. 28psi on 2.5 bar map. Or is he a dumpling?