No MAF? No problem!
Aug 21, 2007, 07:10 PM
#32
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Other people are free to leave the stock MAF in place and plugged in if they wish, and use the MAP patch to allow them to VTA and get rid of issues associated with karmann vortex sensors.
Aug 21, 2007, 09:28 PM
#33
Interesting. I cant wait to see how this develops. My datalogging shows that the 3bar actually will see up to 33psi at 5.0v and log it accurately. It is easy to see over 30psi though if I understand that you are correlating boost to kpa/bar/psi. I am interested in some the implementation details though as much as you know them.
1. Are you logging this and how do the variables log (i.e. 2 byte and boost primarily)?
2. Has it introduced any unexpected quirks into the tuning or is it still the joy its always been?
3. What is it converting to?
1. Are you logging this and how do the variables log (i.e. 2 byte and boost primarily)?
2. Has it introduced any unexpected quirks into the tuning or is it still the joy its always been?
3. What is it converting to?
Aug 22, 2007, 05:05 AM
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Interesting. I cant wait to see how this develops. My datalogging shows that the 3bar actually will see up to 33psi at 5.0v and log it accurately. It is easy to see over 30psi though if I understand that you are correlating boost to kpa/bar/psi. I am interested in some the implementation details though as much as you know them.
1. Are you logging this and how do the variables log (i.e. 2 byte and boost primarily)?
2. Has it introduced any unexpected quirks into the tuning or is it still the joy its always been?
3. What is it converting to?
1. Are you logging this and how do the variables log (i.e. 2 byte and boost primarily)?
2. Has it introduced any unexpected quirks into the tuning or is it still the joy its always been?
3. What is it converting to?
1. Logging load and boost remain the same. Another variable, MAFSOURCE1, is added. MAFSOURCEMAIN is a 2 byte value that represents what the stock MAF is seeing. Address for MAFSOURCEMAIN is hi = 6B68 lo = 6B69
2. 4 additional tables are added, a VE table, MAP calibration table, MAP temp compensation table and a MAPtoMAF offset table. These are used to get close to your original tune. Then you have to fine tune using the fuel and timing maps again.
3. MAFSOURCE1= MAP*TEMPERATURE_COMPENSATION/16*VE/256+MAP_OFFSET
MAP = raw value from address 6AED or MUT 38
TEMPERATURE_COMPENSATION = Temp based 2D table value
VE = RPM based 2D table value
MAP_OFFSET = 1D table value
The goal is to make MAFSOURCE1 = MAFSOURCEMAIN as much as possible.
I need someone with a IX, JDM MAP sensor, tactrix cable and a mostly stock setup to PM me.
Aug 23, 2007, 05:33 AM
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Aug 23, 2007, 02:05 PM
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Are you locking in the baro? This is what creates problems with weather/altitude variance in tunes. If there was a way to still use the stock baro sensor in conjunction with the MAP setup?
Consider this; if a DSM can use an EVO MAF reading off the EVO MAF's baro. (Which it can, with no alterations mentioned, as this was done on DSMlink forums) Wouldn't the same also be true? (EVO reading 2g MAF's baro output?) Just for a cost item. If you sold the evo MAF to a DSM guy, and bought a 2g DSM MAF to dissect for the baro. You would still come out ahead in $.
Not to get ahead of anything. Why dissect a MAF someone else will pay money for. And all you need, you can get from a cheaper source.
Consider this; if a DSM can use an EVO MAF reading off the EVO MAF's baro. (Which it can, with no alterations mentioned, as this was done on DSMlink forums) Wouldn't the same also be true? (EVO reading 2g MAF's baro output?) Just for a cost item. If you sold the evo MAF to a DSM guy, and bought a 2g DSM MAF to dissect for the baro. You would still come out ahead in $.
Not to get ahead of anything. Why dissect a MAF someone else will pay money for. And all you need, you can get from a cheaper source.