MAP sensor location?
11 February 2002, 11:16 AM
#2
Cheers mate,
Thought it was that on first look as it's similar looking to cossie ones (upside down etc) just thro me a bit coz MAP pressure pipe goes through the boost solenoid.
How did you guess I was fitting a dawes cut raiser
James
[Edited by jameswrx - 11/2/2002 11:17:20 AM]
Thought it was that on first look as it's similar looking to cossie ones (upside down etc) just thro me a bit coz MAP pressure pipe goes through the boost solenoid.
How did you guess I was fitting a dawes cut raiser
James
[Edited by jameswrx - 11/2/2002 11:17:20 AM]
11 February 2002, 01:12 PM
#3
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james,
Have you got a dawes for the boost control too, as well as your fuel cut raiser...???
I had the exact same problem when i fitted my dawes boost controller, i got it right in the end by removing the restrictor in the pipe that used to go to the boost solonoid... I then fitted the dawes (not the FCR) in a pipe that went direct from the turbo nipple to the wasgate...
Dan
[Edited by dhorwich - 11/2/2002 1:14:30 PM]
Have you got a dawes for the boost control too, as well as your fuel cut raiser...???
I had the exact same problem when i fitted my dawes boost controller, i got it right in the end by removing the restrictor in the pipe that used to go to the boost solonoid... I then fitted the dawes (not the FCR) in a pipe that went direct from the turbo nipple to the wasgate...
Dan
[Edited by dhorwich - 11/2/2002 1:14:30 PM]
11 February 2002, 01:53 PM
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Hi mate, you dont really want your boost gauge t'd off there..
best place is off the manifold..
Rob
p.s. when the fuel cut raiser opens your gauge will under read if it is fitted where it is now..
edited to add... if you look on top of your manifold you will see three small hoses next to each other, the first one goes to your Dump valve, the middle one goes to your atmos sensor/map sensor (this is the one with your fuel cut raiser), the third pipe is the one you want to 'T' into for your boost gauge.
[Edited by tweenierob - 11/2/2002 2:03:36 PM]
best place is off the manifold..
Rob
p.s. when the fuel cut raiser opens your gauge will under read if it is fitted where it is now..
edited to add... if you look on top of your manifold you will see three small hoses next to each other, the first one goes to your Dump valve, the middle one goes to your atmos sensor/map sensor (this is the one with your fuel cut raiser), the third pipe is the one you want to 'T' into for your boost gauge.
[Edited by tweenierob - 11/2/2002 2:03:36 PM]
11 February 2002, 02:10 PM
#5
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I took my boost gauge from the pipe in the centre of the three in the pic, dump valve is far left and i used the centre one..
Dan
[Edited by dhorwich - 11/2/2002 2:12:12 PM]
Dan
[Edited by dhorwich - 11/2/2002 2:12:12 PM]
11 February 2002, 02:15 PM
#6
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but its straight off the manifold, and has not gone through the atmosphereic thingy.... it does not matter what i goes to aslong as it comes straight from the manifold itself as this pressure will go straight to the boost gauge...???
just thought, i dont have a fuel cut raiser on my car so your right it may make a difference, i.e bleeding air away on a car with a FCR...
Dan
[Edited by dhorwich - 11/2/2002 2:44:13 PM]
just thought, i dont have a fuel cut raiser on my car so your right it may make a difference, i.e bleeding air away on a car with a FCR...
Dan
[Edited by dhorwich - 11/2/2002 2:44:13 PM]
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11 February 2002, 06:14 PM
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Didnt think you had the FCD in that pipe Dan 
What i meant by the hole is that.... there is a hole on the dawes that bleeds off some air, however this does not bleed off air until the dawes is open...
Imagine the dawes had no ball bearing or spring inside it, the dawes would then become a normal bleed valve.. it has a small bleed hole on it... say this (for example)hole makes you run 15psi and the dawes is set at 14psi.. when the dawes reaches its set pressure(14psi) it will open and then run 15psi.. like is said just a guess really...
I think that what Dan said sounds more realistic..
Like Dan said.. let us know mate
Rob
edited cause i see what wasnt plugged in
[Edited by tweenierob - 11/2/2002 6:17:03 PM]
What i meant by the hole is that.... there is a hole on the dawes that bleeds off some air, however this does not bleed off air until the dawes is open...
Imagine the dawes had no ball bearing or spring inside it, the dawes would then become a normal bleed valve.. it has a small bleed hole on it... say this (for example)hole makes you run 15psi and the dawes is set at 14psi.. when the dawes reaches its set pressure(14psi) it will open and then run 15psi.. like is said just a guess really...
I think that what Dan said sounds more realistic..
Like Dan said.. let us know mate
Rob
edited cause i see what wasnt plugged in
[Edited by tweenierob - 11/2/2002 6:17:03 PM]
02 November 2002, 11:35 AM
#12
Yeah don't worry I will, only wanna run 1bar.
Does it deffinately go in the pipe between the boost solenoid and the MAP sensor?
Is it not better to put it in the pipe between the manifold and the boost solenoid, s'pose it goes to the same place but just through the boost solenoid first?
James
Does it deffinately go in the pipe between the boost solenoid and the MAP sensor?
Is it not better to put it in the pipe between the manifold and the boost solenoid, s'pose it goes to the same place but just through the boost solenoid first?
James
02 November 2002, 12:08 PM
#13
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The map sensor measures manifold absolute pressure, when you put it in the pipe leading to the map sensor it bleeds away a small amout on pressure that the MAP sensor would usually see.
It is the map sensor that controls/triggers fuel cut i think amoung other things. It triggers it due to overboost that the map sensor sees, so when you fit the Fuel cut raiser in the pipe leading to the map sensor itself you prevent it from causing overboost as some pressure is bled away...
I think thats how it works, some people have found they could not get the dawes to work right on WRX's i think jonny gav had one and he changed it in the end...???
Dan
It is the map sensor that controls/triggers fuel cut i think amoung other things. It triggers it due to overboost that the map sensor sees, so when you fit the Fuel cut raiser in the pipe leading to the map sensor itself you prevent it from causing overboost as some pressure is bled away...
I think thats how it works, some people have found they could not get the dawes to work right on WRX's i think jonny gav had one and he changed it in the end...???
Dan
02 November 2002, 12:44 PM
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You deffo want to put it between the manifold and map sensor, if you put it between the atmospheric sensor and the map sensor you will get check engine light illumination..
Rob
Rob
02 November 2002, 12:51 PM
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Picture hijack
If you look at this
No.1 is the pipe from the atmos solenoid (No.2)
Pipe No.3 is where you wanna put it, if you put it in pipe No.1 you will get CEL as the map sensor is getting a different reading to the Atmos solenoid due to the bleed of air being after the AS (No.2)
Think that makes sense???
The Boost solenoid is on a different system, different pipes..
Rob
If you look at this
No.1 is the pipe from the atmos solenoid (No.2)
Pipe No.3 is where you wanna put it, if you put it in pipe No.1 you will get CEL as the map sensor is getting a different reading to the Atmos solenoid due to the bleed of air being after the AS (No.2)
Think that makes sense???
The Boost solenoid is on a different system, different pipes..
Rob
02 November 2002, 12:54 PM
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02 November 2002, 12:56 PM
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oops...!!!!!
sorry jameswrx, just shows what i know ey...!!!
Hope you have not blown your car up..
Thanks for that tweenierob...
im going to crawl back under my stone now....
Dan
sorry jameswrx, just shows what i know ey...!!!
Hope you have not blown your car up..
Thanks for that tweenierob...
im going to crawl back under my stone now....
Dan
02 November 2002, 01:05 PM
#19
Ok guys, thanks all, I'm clear on fitting.
Don't worry Dan i've been careful
It's driving me mad though coz I can't get the boost I want!
Trying to set it up to run 1bar, but at mo (and i've tried loadsa times) boost is coming in 0.9bar@4,500rpm in 4th and then @ 5,00rpm it climbs with the revs!
I just wanna set it to come in at 1bar and hold it or tail off a bit but can't sort it!
I've got a bleed valve on my GTi-R set at 1bar and it's been fine like that for years!, can I put a normal bleed valve on my scooby as I reckon it'll work loads better than the dawes!
Anyone done this?
Cheers
James
Don't worry Dan i've been careful
It's driving me mad though coz I can't get the boost I want!
Trying to set it up to run 1bar, but at mo (and i've tried loadsa times) boost is coming in 0.9bar@4,500rpm in 4th and then @ 5,00rpm it climbs with the revs!
I just wanna set it to come in at 1bar and hold it or tail off a bit but can't sort it!
I've got a bleed valve on my GTi-R set at 1bar and it's been fine like that for years!, can I put a normal bleed valve on my scooby as I reckon it'll work loads better than the dawes!
Anyone done this?
Cheers
James
02 November 2002, 01:37 PM
#20
Dan
yeah, i'm trying to setup the dawes boost controller.
I've allready got mine in the pipe between turbo nipple and wastegate actuator but can't sort it.
Whats the restrictor your on about mate?
Also as in this pic my boost gauge take off will now be after the fuel cut raiser, is this ok? As I can't see how everythings gonna work properly if the boost reading is in a position after the air is bled off. Shall I move it?
Cheers
James
yeah, i'm trying to setup the dawes boost controller.
I've allready got mine in the pipe between turbo nipple and wastegate actuator but can't sort it.
Whats the restrictor your on about mate?
Also as in this pic my boost gauge take off will now be after the fuel cut raiser, is this ok? As I can't see how everythings gonna work properly if the boost reading is in a position after the air is bled off. Shall I move it?
Cheers
James
02 November 2002, 01:55 PM
#21
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Where is your dawes fitted??
Best thing to do is run a pipe straight from the turbo into the dawes and then into the wastegate.
Not sure how you have fitted it if you are using the restrictor pipe??
Rob
Best thing to do is run a pipe straight from the turbo into the dawes and then into the wastegate.
Not sure how you have fitted it if you are using the restrictor pipe??
Rob
02 November 2002, 02:02 PM
#22
Rob,
Yeah thats what I thought would happen, I'll tee it off at the manifold.
What pipe can I use other than the pipe to the atmos solenoid for the boost gauge, or can I put it in this pipe but just near the manifold so it's in line before the fuel cut raiser?.
My dawes boost controller is between the nipple on the turbo inlet housing and the actuator allready but it still does this weird levelling off @4,400rpm then climbing @5,00rpm til it hits fuel cut
Cheers
James
Yeah thats what I thought would happen, I'll tee it off at the manifold.
What pipe can I use other than the pipe to the atmos solenoid for the boost gauge, or can I put it in this pipe but just near the manifold so it's in line before the fuel cut raiser?.
My dawes boost controller is between the nipple on the turbo inlet housing and the actuator allready but it still does this weird levelling off @4,400rpm then climbing @5,00rpm til it hits fuel cut
Cheers
James
02 November 2002, 02:10 PM
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Firstly read my edit for best pipe for boost gauge (can post pic if wanted)....
Sounds like it might be the bleed hole on the dawes, if you raise the boost a bit higher does it still do it??
It might be that the dawes is staying shut (like it should) until say 14psi then opening slowly and the bleed is 15psi?? just a guess bit hard to say without feeling it myself...
Rob
only problem with a bleed valve instaed of the dawes is that it stays open, which means on idle it can suck in whatever it likes
Sounds like it might be the bleed hole on the dawes, if you raise the boost a bit higher does it still do it??
It might be that the dawes is staying shut (like it should) until say 14psi then opening slowly and the bleed is 15psi?? just a guess bit hard to say without feeling it myself...
Rob
only problem with a bleed valve instaed of the dawes is that it stays open, which means on idle it can suck in whatever it likes
02 November 2002, 02:29 PM
#25
Rob,
Does this mean my dawes is faulty?,
not really following what you mean bout turning the boost up and it still happening mate. This is where my dawes is
Dan, cheers for pics mate,
Like Rob said I would think you get a lower reading in this pipe coz it's in the same line as fuel cut raiser (bleeding air).
Cheers for this guys, really appreciate your help
James
might be the bleed hole on the dawes
not really following what you mean bout turning the boost up and it still happening mate. This is where my dawes is
Dan, cheers for pics mate,
Like Rob said I would think you get a lower reading in this pipe coz it's in the same line as fuel cut raiser (bleeding air).
Cheers for this guys, really appreciate your help
James
02 November 2002, 02:34 PM
#26
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you still have the restictor in the pipe mate i can see it..... you need to remove this in the pic below....!!!! as i had the same probs as you until i removed this...
Just remove the restictor and fit the larger pipe straight to the dawes....
Dan
My set up is different as i dont have a FCR..!! so my boost gauge is fine in this line.
[Edited by dhorwich - 11/2/2002 2:41:20 PM]
Just remove the restictor and fit the larger pipe straight to the dawes....
Dan
My set up is different as i dont have a FCR..!! so my boost gauge is fine in this line.
[Edited by dhorwich - 11/2/2002 2:41:20 PM]