3 bar map sensor from a MY97 onwards
09 March 2005, 09:02 AM
#3
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Originally Posted by HeMan1320
I'm hearing different things. Is it a 3Bar 2.5Bar or a 1.7Bar ?
Got one now, and all plumbed in but have sold car now, so will never get the chance to try another map and say 1.3/1.4. The Turbo is only good for 1.5 for anything over 1.5 is OK. So irrelevant if its 1.7 or 2.5.
If you no what I mean.
09 March 2005, 09:27 PM
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Originally Posted by HeMan1320
so then what is the point of having a MAP with different Bar ratings?
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10 March 2005, 12:33 PM
#8
The standard map sensor in a Pre96 Scoob's only run in theory upto 1.2816 bar (apprx 2.3 bar, inc 1 bar atmospheric pressure).
From experience anything above a target setting of approx 1.1bar and fuel cut of 1.2bar starts hitting the limit of the standard map sensor. It can also be quite inconsistent at these levels, with boost fluctuations in the higher gears and intermitent fuel-cut.
Using a Map sensor from the later car allows you to go beyond these regions i.e it is a 3bar map sensor (thats 1 bar atmospheric pressure and 2bar boost pressure).
Therefore if you want to map a Pre96 car to run higher then 1.1/1.2 bar using the stock ECU control and retain fuel cut, you need to use the later sensor.
OH! and you also need to rescale the code in the ECU to use the new sensor too....
From experience anything above a target setting of approx 1.1bar and fuel cut of 1.2bar starts hitting the limit of the standard map sensor. It can also be quite inconsistent at these levels, with boost fluctuations in the higher gears and intermitent fuel-cut.
Using a Map sensor from the later car allows you to go beyond these regions i.e it is a 3bar map sensor (thats 1 bar atmospheric pressure and 2bar boost pressure).
Therefore if you want to map a Pre96 car to run higher then 1.1/1.2 bar using the stock ECU control and retain fuel cut, you need to use the later sensor.
OH! and you also need to rescale the code in the ECU to use the new sensor too....
10 March 2005, 09:37 PM
#11
OK, so no, can't change the map sensor and gain more boost then with just a MAP sensor change.
Later MAP sensors do provide higher levels of controllable boost. BUT need mapping .. and hence a new ECU or secondary board. The later std MAP sensors can do 1.8 bar, above what most people can use, but need remapping / scaling so they can be used as Scott says above.
If you are not MAP sensor based for air flow ( i.e. not using a Link ECU ) then the MAP signal seems to be not that important ... my boost controller goes well past fuel cut ( I run 24 PSI boost ) whilst the MAP flatlines it's output by 1.2 bar / 17.5 psi ... as my controller also raises / removes fuel cut whilst 2 levels of boost. This was mapped in for my Power FC and I used 18 psi and 24 PSI, both with no knock or weak AFR, ( I do have full decat, fuel pump and regulator, 550 injectors etc. ) and I get 325 lbft torque and 363 bhp at Well Lane, with some slipping on the rollers!
These boost controllers are available now ( see ad in scooby magazine by the importer ) and work very well!
Later MAP sensors do provide higher levels of controllable boost. BUT need mapping .. and hence a new ECU or secondary board. The later std MAP sensors can do 1.8 bar, above what most people can use, but need remapping / scaling so they can be used as Scott says above.
If you are not MAP sensor based for air flow ( i.e. not using a Link ECU ) then the MAP signal seems to be not that important ... my boost controller goes well past fuel cut ( I run 24 PSI boost ) whilst the MAP flatlines it's output by 1.2 bar / 17.5 psi ... as my controller also raises / removes fuel cut whilst 2 levels of boost. This was mapped in for my Power FC and I used 18 psi and 24 PSI, both with no knock or weak AFR, ( I do have full decat, fuel pump and regulator, 550 injectors etc. ) and I get 325 lbft torque and 363 bhp at Well Lane, with some slipping on the rollers!
These boost controllers are available now ( see ad in scooby magazine by the importer ) and work very well!
10 March 2005, 09:39 PM
#12
Scott - what wiring mods would be needed for a later MAP sensor to be fitted to a early pre 97 car?
Previous replies were buy a special 3 bar sensor ... but still may need wiring !
Mapping is needed I know!
Previous replies were buy a special 3 bar sensor ... but still may need wiring !
Mapping is needed I know!
10 March 2005, 10:23 PM
#13
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[QUOTE=vulnax999]Scott - what wiring mods would be needed for a later MAP sensor to be fitted to a early pre 97 car?
Previous replies were buy a special 3 bar sensor ... but still may need wiring !
Mapping is needed I know
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