Any one with OBD 2 Readers
#1
SFZCC
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Any one with OBD 2 Readers
I was wandering if anyone with OBD 2 readers like the digimoto have checked for codes even if your light is not on? I have a constant code P0328 which is for excessively high voltage form knock sensor, I have had it for a while even before the TT install and had not paid much attention to it since the light wasn't on and I really didn't notice any difference in performance.
We were trying to tune another TT and just couldn't get the power considering we were using what I have in mine and decided to check the ECu and found the same code plus P0327 which is excessively low voltage so I assume his timing was just all messed up causing the problems.
So based on this I decided to log my timing using the digimoto and although it is not the best logger I did see my timing in at WOT around 15 or so, assuming stock timing is 27 and I am pulling 6 degrees at redline and full boost this means the ECU is pulling another 6 degrees or so, which might also explain why I am only at 401 at 8 psi while others are at 420+
SO if anyone else has this please post and any thoughts as to why, as I type this it occurred to me I have the UR Crank Pulley so I wonder if that is causing it?
We were trying to tune another TT and just couldn't get the power considering we were using what I have in mine and decided to check the ECu and found the same code plus P0327 which is excessively low voltage so I assume his timing was just all messed up causing the problems.
So based on this I decided to log my timing using the digimoto and although it is not the best logger I did see my timing in at WOT around 15 or so, assuming stock timing is 27 and I am pulling 6 degrees at redline and full boost this means the ECU is pulling another 6 degrees or so, which might also explain why I am only at 401 at 8 psi while others are at 420+
SO if anyone else has this please post and any thoughts as to why, as I type this it occurred to me I have the UR Crank Pulley so I wonder if that is causing it?
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Originally Posted by racin
Use higher octane fuel, and try again (unless you were already using 100 octane). See if this is mechanical noise, etc., or fuel induced retarding.
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Originally Posted by jpc350z
Could a knock sensor fail with the voltage output high and if it can fail in this mode then wouldn't the ECU pull timing thinking it's a valid signal?
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Originally Posted by westpak
I was wandering if anyone with OBD 2 readers like the digimoto have checked for codes even if your light is not on? I have a constant code P0328 which is for excessively high voltage form knock sensor, I have had it for a while even before the TT install and had not paid much attention to it since the light wasn't on and I really didn't notice any difference in performance.
We were trying to tune another TT and just couldn't get the power considering we were using what I have in mine and decided to check the ECu and found the same code plus P0327 which is excessively low voltage so I assume his timing was just all messed up causing the problems.
So based on this I decided to log my timing using the digimoto and although it is not the best logger I did see my timing in at WOT around 15 or so, assuming stock timing is 27 and I am pulling 6 degrees at redline and full boost this means the ECU is pulling another 6 degrees or so, which might also explain why I am only at 401 at 8 psi while others are at 420+
SO if anyone else has this please post and any thoughts as to why, as I type this it occurred to me I have the UR Crank Pulley so I wonder if that is causing it?
We were trying to tune another TT and just couldn't get the power considering we were using what I have in mine and decided to check the ECu and found the same code plus P0327 which is excessively low voltage so I assume his timing was just all messed up causing the problems.
So based on this I decided to log my timing using the digimoto and although it is not the best logger I did see my timing in at WOT around 15 or so, assuming stock timing is 27 and I am pulling 6 degrees at redline and full boost this means the ECU is pulling another 6 degrees or so, which might also explain why I am only at 401 at 8 psi while others are at 420+
SO if anyone else has this please post and any thoughts as to why, as I type this it occurred to me I have the UR Crank Pulley so I wonder if that is causing it?
#7
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Originally Posted by booger
This....digimoto..[ never heard of it ] Does it read what the ECU is doing ? If so , than your ECU is retarded timing to 15 degree's and you are pulling another 6 degree's . My OBD2 reads only what the ECU is doing and not what my piggyback is adding to the mix. When my wiring was messed up . At WOT , the OBD2 was reading 15 of timing advance . It was getting a false reading from the CAS wire [ knock ] . PLus my piggyback was reducing the timing also
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Originally Posted by booger
After the wiring was straightened out the car really woke up . Now the OBD2 reads 22 degree's at WOT and actually goes up to 24 degree's after 6500rpm
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