how to get rid of MAF
15 November 2003, 11:53 PM
#1
Scooby Regular
Thread Starter
iTrader: (4)
Join Date: Jun 2003
Location: Scotchland
Posts: 9,200
Likes: 0
Received 0 Likes
on
0 Posts
i know i could get rid of it by getting a new ecu, but is there any other way???
i'm thinking it may be the cause of a bit of rough idleing but it should be ok as it was only replaced a couple of months ago.
i'm thinking it may be the cause of a bit of rough idleing but it should be ok as it was only replaced a couple of months ago.
16 November 2003, 12:16 AM
#2
Scooby Regular
Join Date: Aug 2003
Location: west yorkshire
Posts: 761
Likes: 0
Received 0 Likes
on
0 Posts
Didn't know you could get rid of the MAF as the ecu relies on it for the correct air flow and hence mixes the right amount of fuel.. i stand to be corrected 
16 November 2003, 10:13 AM
#6
Scooby Regular
Join Date: Sep 2001
Posts: 1,873
Likes: 0
Received 0 Likes
on
0 Posts
MAF measures air flow directly to decide how much fuel to put in.
Other ECU's use a throttle pot and engine revs as inputs. For any measured throttle position and revs the engine will always be sucking in the same amount of air so it can add the fuel to suit. If it's clever it will also measure air temp and baro pressure to fine tune for different ambients that affect air density.
Very much doubt if you can just add a thottle pot to the standard ECU you will need to change to an aftermarket ECU and map it from scratch.
Other ECU's use a throttle pot and engine revs as inputs. For any measured throttle position and revs the engine will always be sucking in the same amount of air so it can add the fuel to suit. If it's clever it will also measure air temp and baro pressure to fine tune for different ambients that affect air density.
Very much doubt if you can just add a thottle pot to the standard ECU you will need to change to an aftermarket ECU and map it from scratch.
16 November 2003, 10:27 AM
#7
Scooby Regular
Join Date: Jun 2000
Posts: 327
Likes: 0
Received 0 Likes
on
0 Posts
HKS did a speed density (IIRC) device for MAF replacement, but it was horrendously expensive and I think it's discontinued now.
John Banks looked into building and coding some appropriate hard/firmware for doing this a bit ago.
Cube.
John Banks looked into building and coding some appropriate hard/firmware for doing this a bit ago.
Cube.
Trending Topics
16 November 2003, 02:26 PM
#9
Scooby Regular
iTrader: (9)
Join Date: Oct 2003
Location: InTheSticks
Posts: 6,120
Likes: 0
Received 0 Likes
on
0 Posts
A HKS Vein Pressure Convertor (VPC) is what you need...
The HKS VPC is designed to physically and electronically replace OE air metering devices which present a significant restriction to the intake system and offer no adjustment or reprogramming options to take advantage of dramatically higher air flow or larger fuel injectors. The VPC converts both air flow meter and air mass sensor systems to what is referred to as speed density systems by utilizing a 16 bit central processing unit reading its own intake air temperature sensor and absolute pressure transducer (B-MAP sensor) signals. This unique conversion feature not only allows the VPC to replace the factory air flow metering device, but also eliminates the need for a fuel cut defencer. Another benefit of the VPC is the ability to create our own programs to take advantage of larger fuel injectors and new air flow characteristics (larger turbos). In some specific instances, the VPC may be used in addition to the PFC F-Con and larger injectors for the ultimate in HKS plug-in fuel system technology. VPC equipped vehicles respond quicker with improved horsepower. To take full advantage of the VPC, HKS VPC Power Flow adapters with the HKS Super Mega Flow air filter should be used......
That was a bit of a mouthful!!!
[Edited by little'un - 11/16/2003 2:27:18 PM]
The HKS VPC is designed to physically and electronically replace OE air metering devices which present a significant restriction to the intake system and offer no adjustment or reprogramming options to take advantage of dramatically higher air flow or larger fuel injectors. The VPC converts both air flow meter and air mass sensor systems to what is referred to as speed density systems by utilizing a 16 bit central processing unit reading its own intake air temperature sensor and absolute pressure transducer (B-MAP sensor) signals. This unique conversion feature not only allows the VPC to replace the factory air flow metering device, but also eliminates the need for a fuel cut defencer. Another benefit of the VPC is the ability to create our own programs to take advantage of larger fuel injectors and new air flow characteristics (larger turbos). In some specific instances, the VPC may be used in addition to the PFC F-Con and larger injectors for the ultimate in HKS plug-in fuel system technology. VPC equipped vehicles respond quicker with improved horsepower. To take full advantage of the VPC, HKS VPC Power Flow adapters with the HKS Super Mega Flow air filter should be used......
That was a bit of a mouthful!!!
[Edited by little'un - 11/16/2003 2:27:18 PM]
16 November 2003, 02:59 PM
#10
Scooby Regular
Join Date: Nov 2000
Location: 32 cylinders and many cats
Posts: 18,658
Likes: 0
Received 1 Like
on
1 Post
See the thread on 22b. When I get my car back I'm going to test it.
Best plan in the end I think is to use an inexpensive microcontroller.
The basic calculation is:
MAF = k * MAP * RPM / charge temperature
RPM is battery voltage pulse on every 20 degrees crank rotation. MAP goes from 0.88 at vac to 4.84 at 1.8 bar boost. Charge temp can be done with a thermocouple.
I hope to have something running and publish all the details - I will probably have it working by the spring
[Edited by john banks - 11/16/2003 3:00:25 PM]
Best plan in the end I think is to use an inexpensive microcontroller.
The basic calculation is:
MAF = k * MAP * RPM / charge temperature
RPM is battery voltage pulse on every 20 degrees crank rotation. MAP goes from 0.88 at vac to 4.84 at 1.8 bar boost. Charge temp can be done with a thermocouple.
I hope to have something running and publish all the details - I will probably have it working by the spring
[Edited by john banks - 11/16/2003 3:00:25 PM]
)
16 November 2003, 04:24 PM
#13
Scooby Regular
Join Date: Jun 2002
Location: From Kent to Gloucestershire to Berkshire
Posts: 2,905
Likes: 0
Received 0 Likes
on
0 Posts
In this case, assuming I'm following this correctly, k must be a constant "scaling factor". Possibly more to the point, John - do you know the value of k yet?
I put it in before some smart **** mentioned that I shouldn't just divide by temperature
17 November 2003, 12:34 PM
#19
Scooby Regular
Thread Starter
iTrader: (4)
Join Date: Jun 2003
Location: Scotchland
Posts: 9,200
Likes: 0
Received 0 Likes
on
0 Posts
thinkin i'm just gonna get a link ecu. that'll get rid of MAF therefore shouldn't have any more rough idleing and get rid of me wee problem with the afr.
cheers again people
cheers again people
Thread
Thread Starter
Forum
Replies
Last Post
Mattybr5@MB Developments
Full Cars Breaking For Spares
28
28 December 2015 11:07 PM
Mattybr5@MB Developments
Full Cars Breaking For Spares
12
18 November 2015 07:03 AM