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

 

i have heard people running at 110% but i would never do that for obvious reasons. just get bigger injectors and keep it safe

 

If you were to guess what boost would you think I was at?

 

26 psi

 

26 tapering to what would you guess...mbc....

 

21

 

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.

 

mine spikes 31.5 psi and tapers to about 26psi on a stock evo 8 turbo 9.8 hotside lol on MBC so take that

 

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.

 

yah I see 110% often @ 25psi

 

I too have seen 100-105% fairly often. Injectors will be needed soon but not on my current setup.

 

So I must assume that there is something wrong with the IDC showed in evoscan (I have always assumed it). Because if we pass 100%IDC the AFR must go leaner because we are out of control of the injectors.

 

easy can you explain john to lesser knowing like myself

 

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

 

thanks which extra boxes do I need to check in 2.6 to view load? Currently I have checked Throttle position,rpm,batt level,tim adv,IPW,IDC,and knock.