SD tuning when IAT is integrated into MAF?
04-20-2007, 02:07 PM
#1
SD tuning when IAT is integrated into MAF? I have an 02 Z06 with an integrated IAT sensor into the MAF. So when I disconnect the MAF to tune the VE table I have no IAT sensor. Should I just 0 out my MAF table in the Engine Calibration table? Or 0 out the MAF High and Low frequencies tables in the Diagnostic Perameters? Any help would be appreciated. Thanks.
Brett
Brett
04-20-2007, 02:22 PM
#2
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Set your:
{C2901}MAF High Frequency Fail to 1Hz
{C2903}MAF High Frequency Fail Limit to 1
{C2904}MAF Low Frequency Fail to 13,000Hz
{C2906}MAF Low Frequency Fail Limit to 1
That's what they're called in EFI Live. HPT may have slightly different names. The limits are basically the number of times the MAF can fail the test for going above the High or below the Low. By setting them to 1, it should fail immediately.
{C2901}MAF High Frequency Fail to 1Hz
{C2903}MAF High Frequency Fail Limit to 1
{C2904}MAF Low Frequency Fail to 13,000Hz
{C2906}MAF Low Frequency Fail Limit to 1
That's what they're called in EFI Live. HPT may have slightly different names. The limits are basically the number of times the MAF can fail the test for going above the High or below the Low. By setting them to 1, it should fail immediately.
04-20-2007, 02:23 PM
#3
TECH Senior Member
You set the high fail frequency to 0 and it will cause a MAF failure to be reported... however I think this also has additional affects on C5s... not 100% sure since I've not tuned any C5s using non custom SD OS's
04-20-2007, 04:30 PM
#4
Thanks guys. I leave the MAF hooked up with this approach correct? So when I am done with the SD tune I just return the tables to stock and start calibrating the MAF correct? There is also an ETC table that I noticed has been modified on the tune I am bouncing my tuning off. Some thing about a problem with the car going into reduced power if you don't multiply the tables by 100% or some thing. I can get you the code to the table if you need it. I am useing EFI live.
04-20-2007, 04:42 PM
#5
Hi, For the speed density program it is always better to use one of efilives custom os systems. You can use it with your stock tune even. But it will allow you to use all the spark tables and fueling tables instead of defaulting to single modes.
also, if you have an auto, make sure that the trans dtcs are set to not allow max line pressure when you have a MAF failure.
The other table you set higher is the calculated airflow table. If not it will throw a 1514 code.
also, if you have an auto, make sure that the trans dtcs are set to not allow max line pressure when you have a MAF failure.
The other table you set higher is the calculated airflow table. If not it will throw a 1514 code.
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04-20-2007, 10:49 PM
#8
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The only problem we had with HP tuners in SD 2 bar is the engine going into reduced power. We sent the file to HP tuners and it let us go the rest of the way with the stock maf in place. So far the best pull to date is 825 rwhp.
04-20-2007, 11:56 PM
#9
Wait.
Isn't that why you copy the high octane to the low octane table so you are dealing with the same timing curve? What method do you recommend for tuning then? I tried leaving the maf hooked up and adjusting the VE tables to match but at idle and low cruise I was already at 85 and up in the cells. That is def not correct.
Brett
Isn't that why you copy the high octane to the low octane table so you are dealing with the same timing curve? What method do you recommend for tuning then? I tried leaving the maf hooked up and adjusting the VE tables to match but at idle and low cruise I was already at 85 and up in the cells. That is def not correct.
Brett
