Stock Inj duty cycle
Nov 22, 2009, 07:10 PM
#1
Stock Inj duty cycle
Just curious what is the max stock injectors will run in terms of duty cycle? I logged a couple of runs tonight and max duty was 102.96% with no knock. TBE tune MBC ETS 4inch IC Spoolinup COP at .030 gap Copper plugs
Nov 22, 2009, 08:23 PM
#7
Why on earth would you guess how much boost you are at? Don't you have a boost gauge or upgraded MAP sensor? Very very foolish if you are tuning and have no way of referencing boost.
You should be able to do up to 115% or so w/o them going totally static, the stock turbo tapers pretty bad (in ref to power, not just boost) up top which helps this. With alky, I ran mine up to peak of 129% IIRC w/o issue.
You should be able to do up to 115% or so w/o them going totally static, the stock turbo tapers pretty bad (in ref to power, not just boost) up top which helps this. With alky, I ran mine up to peak of 129% IIRC w/o issue.
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Nov 22, 2009, 08:59 PM
#9
IDCs have almost nothing to do with boost or power. I have seen 330whp cars at 102% and 374whp cars at 102%. VE and mods have a lot to do with how the car is going to react. A more accurate question would be what load is the car at when it is at 102.xx% and the math is pretty easy.
Dec 5, 2009, 08:38 AM
#13
IDCs have almost nothing to do with boost or power. I have seen 330whp cars at 102% and 374whp cars at 102%. VE and mods have a lot to do with how the car is going to react. A more accurate question would be what load is the car at when it is at 102.xx% and the math is pretty easy.
Dec 5, 2009, 10:52 AM
#14
Peak load and load at lets say 7500-8000. A stock MAF car on gasoline (octane limited) will have a load level that corresponds to the estimated hp formula I implemented with Eric's help so long ago.
For instance if you are at 102% and only 190 load at 7500, the formula looks like this:
190 (load) / 95 = 2 (g/rev) * 7500 (rpm) / 454 (constant) = 33.04 (lbs/min)
33.04 * 9.15 (apparent constant for DJ numbers)= 302whp
Now if we repeat the same thing with higher load (better VE and more power) we get
220/95=2.315*7500/454=38.256*9.15=350whp
Both values can be 102% but because the car is breathing better from cams, exhaust, whatever it makes more power as is reflected in more load. Strange but true.
https://www.evolutionm.net/forums/ec...hp-torque.html
For instance if you are at 102% and only 190 load at 7500, the formula looks like this:
190 (load) / 95 = 2 (g/rev) * 7500 (rpm) / 454 (constant) = 33.04 (lbs/min)
33.04 * 9.15 (apparent constant for DJ numbers)= 302whp
Now if we repeat the same thing with higher load (better VE and more power) we get
220/95=2.315*7500/454=38.256*9.15=350whp
Both values can be 102% but because the car is breathing better from cams, exhaust, whatever it makes more power as is reflected in more load. Strange but true.
https://www.evolutionm.net/forums/ec...hp-torque.html