JDG Gt4

Here is a better log showing the trim working

I would like comments from anyone that can remember their University control theory to make sure I haven't implemented something with an inherent instability. While doing some data logging on my daily commute to work, I had a light bulb moment and realised that a type of closed loop system could be implemented in the features that Wolf provides. Implementation: Below is a screen shot of the boost control configuration screen, with duty cycle Vs RPM. This is the base configuration which in my case was setup to provide Approx 14psi. On the left you can see a range of modifiers they provide such as air temp, engine temp and throttle position which are all handy. Then there is the "Special Trim" where you can choose what signal you map in the last modifier. One of the options is the Boost, psi value. Then with boost PSI selected, you can map a +/- percentage to modify the base table by based on the boost. Since I'm aiming for 14psi I have it giving and extra 10% until it reaches 10psi, then it ramps down to 0% at 14psi and then through to -10% at 18PSI. To give an idea, previous testing showed a decrease of 15% duty, dropped the boost to 8-9 Psi from 13-14. Result: The seat of my pants dyno tells me that this made a massive difference to the turbo spool, and comparing these data logs you can see the closed loop control adjusting the boost solenoid duty cycle in the second graph. BEFORE - Open Loop Log: You can see the duty cycle move with RPM as mapped AFTER - Closed Loop Log: here you can see the duty cycle start to decrease as it approaches the preset 14PSI. Closed Loop Control!! This is were it all gets a little control theory. I think what I have implemented here is a form of differential controller (integrator ?). The greater slope I put on the special trim, the greater I increase the gain on the output of the differential controller. How far should I go with this? The greater the gain the faster the boost response but I believe greater chance of instability and boost overshoot? I guess trial and error. By limiting this to +/-10% for now, I hope to avoid some of this instability but that now make is it a non linear system. Again is this going to give me stability issues? Might be time to crack out the Uni text books

I was wondering if anybody has tried it? I was thinking you could implement it to trim the boost controll solenoid +/- 10-20% by mapping the PSI into one of the multicontrollers and then feeding this back to the special trim on the boost control. Obviously this isn't as good as a full PID controller but it would be able to trim it and hopefully stabalise it a bit more?

Just wanted to give an update and a thank you to you guys for helping me out I finally got round to rejigging my loom and made up the shift likghts and I'm really happy with the results. Thank you for you help.

I assume that is with a 80 degress thermostat? I like the methodical thinking with the IAT setup. I suppose it would have been handy to know the IAT when it wasit all dyno tuned, because this wold obviously been the point to start taking timing out once it exceeded that. cheers it all makes a lot of sense.

thank you I always forget about the whole pull to ground aspect (damn Fets). And thank you for the heads up on the regulated outputs. IT will make more sense to use these

Your setup is more what I would have been expecting. It seemed strange to an uneducated mind that you would wait till such temps before pulling a large amount of ignition timing. Is there a guide somewhere I could read on how to set this up? or is it more by experience of on road performance? listening for knock, and noting the temp and correspondingly dropping the timing? This is probably a hard question to answer but any help would be appreciated

Has anybody configured the RPM Shift lights from one of the spare ignition outputs? Would I be right in assuming that you just connect at light (probably LED) to the ignition output and put a limiting resistor in assuming the output is 12 or 13.5V? Cheers Ben

Hello All, I'm just wondering what setup you guys use for the intake air temp compensation? do any of you use it? The default file for my car doesn't but I want to implement it. It does however have a default graph that takes out -7 degrees BTDC timing once it reads over 80 degrees C increasing to -12 degrees BTDC at 110 Degrees C and then it is flat from there. Does this setup work for all cars, or is this something that needs to be road or dyno "tunned". cheers Ben

What output does the knock sensor put out? it is a pulsed signal or a 0-5 V sliding scale?

I have stumbled upon the kits at http://www.alcohol-injection.com/ and I think I will give them a go to try a basic setup. I can then upgrade to a proportional setup later. Best way to learn is try it out yourself Thank you for all the help. It has given me a lot of food for thought.

Thank you, I was on the right track but you have just saved me a whole heap of stuffing round Is there any reason why there is a lack of guides for the v500? is it just because it is a newer ecu? or are you just supposed to know these details. cheers again

Hello all, a bit from left field here, but I have been looking for some information on the V500 ecus for a while and you guys seem to have the most info. I live in Australia and it is like Wolf EMS couldn't care. Anyway I want to setup a basic water/methanol injection setup to my celica Alltrac. I was wondering if you could give me some details of the setup you used on your car? I just want to setup a basic one to begin with that starts the pump above a certain boost pressure. How would I configure the wolf to do this? Also what is the best circuit setup to drive the pump? I assume I would have the wolf switching an auxiliary relay which would then switch the pump? if so how much can the v500 output relays handle? sorry if this seems like a noob question. EDIT: I just found your wiring/schematics thread and it has helped heaps thank you!!!! So I could set the pump up the same was as the fuel pump relay with the ECU dragging down the output to energize the relay? cheers