Invaliduser113

Perfect I will give that a try and see what it does.

Yes, I get choke in the turbo going to wot. I am receding throttle position and have it calibrated to my application.

I have altered the base tuning and got it 90% but I am having issues on the 2/3 to 100% throttle.

The issue I am having is at 2/3 I will see drive pressures over 40psi. My boost around 15-23, I am seeing about 80k rpm. 12cm is usually to big for me as I'm running this on my 4bt and that causes the turbo rpm to fall to drastically. I will see dtbr at about 2.6 and higher I have been setting the turbo to 9 than 10cm^2 and that helps at higher engine rpm. 30 is just a reasonable number I picked that seems to be when it is running the strongest. If I wot at a low engine speed the turbo stays small and the drive pressure gets to about 40 to 44 and gauss the engine to fall on its face.

Yes sir I have a thought, if I can get the controler to regulate drive pressure on the top end, mostly under Wot it would be a much more efficient turbo. I think I think the controler could keep it in its sweet spot better than me writing values.

Very bottom of tab E_Pos manage if (turbo_rpm > curve_rpm[3]) {vane_position -= TPS_range;} if (turbo_rpm > 110000) { if (turbo_accel[2] > 60) { vane_position -= 10; } if (turbo_accel[2] > 90) { vane_position -= 10; } } // Overrun protection if (turbo_rpm > 140000 ){ // 145,000 rpms is where I get worried about shaft speed. if (turbo_accel[2] > 0 && BoostPressure > 25) {vane_position = last_vane_position - 2;} //this will creep the vane position more open each code cycle if turbo rpms are above 150,000 if not in curvea ( perf mode defined by "F_watchpot" tab) else if (turbo_accel[2] > 0 && BoostPressure < 25) {vane_position = last_vane_position - 1;} else {vane_position = last_vane_position;} } if (turbo_rpm > 155000) { vane_position -=10; } if (turbo_rpm > 160000) { vane_position -=40; } } vane_position -= (FuelOffset * SpeedOffset); } if (turbo_rpm < minimum_turbo_rpm) { if (BoostPressure < 10) {vane_position = 700;} else if (BoostPressure < 20){vane_position = 600 ;} else { vane_position = 500;} //so that the turbo will default to %50 if no rpm sense. } if (ExhaustPressure > 30 ){ // Max exhaust bakpressure. if (turbo_accel[2] > 0 && BoostPressure > 20) {vane_position = last_vane_position - 2;} //this will creep the vane position more open each code cycle if back pressure if not in curvea ( perf mode defined by "F_watchpot" tab) else if (turbo_accel[2] > 0 && BoostPressure < 25) {vane_position = last_vane_position - 1;} else {vane_position = last_vane_position;} }

I have been trying to add some coding into version 1.08 to control the max exhaust pressure while driving. But i am having issues trying to figure it out, this is what i got going at the moment, I am trying to get coding to limit the max drive pressure. Not even sure if any of this is even remotely correct. if (ExhaustPressure > 30 ){ // Max exhaust bakpressure. if (turbo_accel[2] > 0 && BoostPressure > 20) {vane_position = last_vane_position - 2;} else if (turbo_accel[2] > 0 && BoostPressure < 25) {vane_position = last_vane_position - 1;} else {vane_position = last_vane_position;}

Did you get your speed sensor working?

Thankfully the sensors are easy to change. When your tuning the turbos, have you found it is easier to get the turbo spooled starting with a little larger housing or keeping it tight and opening it quickly?

I just had issues with my maxxim chip, ended up having to make a new one. The speed sensor could be temperature sensitive and when it gets cold it opens, seen that a few times.

You already have snow? Yuck! Did it sound like a big rig? Haha its a safety measure can't get on it and cause a spin out. I have been making test passes in the rain. I'm having an issue with the speed sensor reading. At the moment I have tried wiring the chip up as a1 and a2 mode and exactly as you layer it out on pg 14 hopefully correctly per the diagrams on maxim. It will not read any rpm. The circuit to the turbo is good. If I hook up just the speed sensor sorry +wire into 8 port it will read a turbo speed. I have #1 as the port with the little dimple on the chip.

I wonder than at what speed is it detrimental to the turbo and how far it can actually be pushed. If I blow mine up I will let you know what sped to not exceed. The hx40 would be a slightly larger turbo tho. So maybe it can not spin as fast?

What does holset rate the turbo to135k ish? I would think you could get the drive up by keeping the vanes small that should really spin the turbo and to keep the drive a but higher should really help out the boost to. Wonder what the 6.7 guys spin the turbo to in modded form? They have to be above the 140 mark. I just got my turbo on my 4bt have g issues with the speed sensor so I can update ya to with what I find by playing around.

Holly cow you have been busy. That actually should work out really well.

There where no 6.7's at work and I was busy replacing a manifold on a c12 acert, I will keep a look out and try and get any information I can when one comes through the door.