What is the max load are u seeing guys?
Jun 6, 2007, 11:20 AM
#31
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I'm seeing about 275 currently 24psi spike, 93 octane
HKS 280, air filter, 3" TBE w/test pipe and bullet muffler
HKS 280, air filter, 3" TBE w/test pipe and bullet muffler
Last edited by Mellon Racing; Jun 6, 2007 at 11:30 AM.
Nov 13, 2008, 11:51 AM
#36
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when I put a bead of epoxy around the honeycomb to keep it in place my peak load went on up to 380kpa where it cannot go higher, so when I run more boost it doesn't send the extra fuel for it. I just removed the honeycomb and scaled the injectors back in and now it's ~ 365kpa peak and I have room to grow again.
Nov 13, 2008, 02:51 PM
#37
Thanks Chris, was hoping you would chime in as I knew you'd pushed it very hard.
I looked at the code and have calculated the basis for the ~380 limit.
There is a lookup table for the maximum allowed which is maxxed to 255. This is then multiplied by approx 128 depending on water temp and another time by approx 128 depending on air temp, then divided by 16384 then multipled by 8.
This gives: 255*128*128/16384*8 = 2040
This is scaled the same as the other MAFSOURCE variables, which is converted to load by multiplying by the MAF size which is 0x9884/0xffff or 0.59577 which gives:
2040*0.59577= 1215.4 which has to be multipled by 10/32 to give load = 379.8
If anyone needs more headroom, those water and air temp tables that contain ~128 can be increased to hopefully allow this. These tables aren't used anywhere else in the ECU apart from limiting the load.
I looked at the code and have calculated the basis for the ~380 limit.
There is a lookup table for the maximum allowed which is maxxed to 255. This is then multiplied by approx 128 depending on water temp and another time by approx 128 depending on air temp, then divided by 16384 then multipled by 8.
This gives: 255*128*128/16384*8 = 2040
This is scaled the same as the other MAFSOURCE variables, which is converted to load by multiplying by the MAF size which is 0x9884/0xffff or 0.59577 which gives:
2040*0.59577= 1215.4 which has to be multipled by 10/32 to give load = 379.8
If anyone needs more headroom, those water and air temp tables that contain ~128 can be increased to hopefully allow this. These tables aren't used anywhere else in the ECU apart from limiting the load.
Nov 13, 2008, 05:14 PM
#40
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Thanks Chris, was hoping you would chime in as I knew you'd pushed it very hard.
I looked at the code and have calculated the basis for the ~380 limit.
There is a lookup table for the maximum allowed which is maxxed to 255. This is then multiplied by approx 128 depending on water temp and another time by approx 128 depending on air temp, then divided by 16384 then multipled by 8.
This gives: 255*128*128/16384*8 = 2040
This is scaled the same as the other MAFSOURCE variables, which is converted to load by multiplying by the MAF size which is 0x9884/0xffff or 0.59577 which gives:
2040*0.59577= 1215.4 which has to be multipled by 10/32 to give load = 379.8
If anyone needs more headroom, those water and air temp tables that contain ~128 can be increased to hopefully allow this. These tables aren't used anywhere else in the ECU apart from limiting the load.
I looked at the code and have calculated the basis for the ~380 limit.
There is a lookup table for the maximum allowed which is maxxed to 255. This is then multiplied by approx 128 depending on water temp and another time by approx 128 depending on air temp, then divided by 16384 then multipled by 8.
This gives: 255*128*128/16384*8 = 2040
This is scaled the same as the other MAFSOURCE variables, which is converted to load by multiplying by the MAF size which is 0x9884/0xffff or 0.59577 which gives:
2040*0.59577= 1215.4 which has to be multipled by 10/32 to give load = 379.8
If anyone needs more headroom, those water and air temp tables that contain ~128 can be increased to hopefully allow this. These tables aren't used anywhere else in the ECU apart from limiting the load.
good stuff.Right now I'm okay but I'm going to be putting in race gas and running another 6psi or more soon and fully expect to be all over the 380kpa clip again
Nov 14, 2008, 01:24 PM
#42
88590015:
2d7c - 17 values, the important ones from 2000 RPM are already at 255
2d94 water multiplier - 8 byte values that can be increased to 255
2da2 air multiplier - 8 byte values that can be increased to 255
Suggest try increasing the 8 values from 2d94 and the 8 values from 2da2 to 255. Please confirm there is nothing funny about the way the car runs, otherwise I expect you can register and use higher load values.
2d7c - 17 values, the important ones from 2000 RPM are already at 255
2d94 water multiplier - 8 byte values that can be increased to 255
2da2 air multiplier - 8 byte values that can be increased to 255
Suggest try increasing the 8 values from 2d94 and the 8 values from 2da2 to 255. Please confirm there is nothing funny about the way the car runs, otherwise I expect you can register and use higher load values.
Nov 20, 2008, 12:01 AM
#43
88590015:
2d7c - 17 values, the important ones from 2000 RPM are already at 255
2d94 water multiplier - 8 byte values that can be increased to 255
2da2 air multiplier - 8 byte values that can be increased to 255
Suggest try increasing the 8 values from 2d94 and the 8 values from 2da2 to 255. Please confirm there is nothing funny about the way the car runs, otherwise I expect you can register and use higher load values.
2d7c - 17 values, the important ones from 2000 RPM are already at 255
2d94 water multiplier - 8 byte values that can be increased to 255
2da2 air multiplier - 8 byte values that can be increased to 255
Suggest try increasing the 8 values from 2d94 and the 8 values from 2da2 to 255. Please confirm there is nothing funny about the way the car runs, otherwise I expect you can register and use higher load values.
Nov 20, 2008, 12:18 AM
#44
When you say 8byte value you mean one value in 8 byte format not 8 values correct? I understood it that way based on the main load table you mentioned as having 17 values vs rpm at any rate.
Also I am seeing 147 and 115 as uint8 values attached to those addresses in stock IX Roms. Did I miss something?
thanks
Also I am seeing 147 and 115 as uint8 values attached to those addresses in stock IX Roms. Did I miss something?
thanks
Last edited by JohnBradley; Nov 20, 2008 at 12:26 AM.
