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Davidv

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Everything posted by Davidv

  1. Hi, My other car has been off the road for ages, and life has been in the way. So I thought it might be fun to just wire up my ECU into the Echo so I could have a play around with some tuning stuff again. It's a 1300cc economy engine so not going to set the world on fire. But a bit of fun. I need/want to revert it all to factory though, so I bought a spare ECU from wreckers and cut the plugs out to make a patch loom. This car has VVTI on the intake side, which means I could do my usual sweep through the vvti angles and see which delivers the most airflow into the engine.
  2. Hi, I've recently been setting up an Alpha N based engine with modelled fuel. With Alpha N the shape of the tables are a bit abstract, as at low rpm a small amount of throttle opening can deliver nearly the entire air requirement of the engine. So to mitigate this I had the idea of using Air per Cyl Estimated as a load axis on my ignition table, so that as conditions change and the VE calculation/fuel changes, the ignition timing would match it. So I can let the wideband trim the fuel to be correct, and then the ignition timing will just follow suit instead of needing its own set of
  3. Davidv

    dashboard arduino

    Forget about the CanID you really need to think about Frame ID instead. Your frame ID takes up one of the bytes in the message. So in this example below, it is Frame number 13 . When this can frame is received by your teensy, you need to look a that first byte to tell you which frame it is. If the number is 13, then you know that your values in the frame are Inj timing, Ign Angle, and Inlet / LH target. So you can update those values.
  4. Do you have the other half of it connected to 12v? I've done the same where I removed the factory stopper switch and put another brake switch in. But the problem was that I really needed the switch to activate on/off closer to the engagement/bite point of the clutch, rather than right at the end of travel. So it didnt work so great for launch control etc. So I'm going to redo it with an adjustable mount somehow.
  5. So you've physically wired your tacho to the aux output that you're wanting to use as a tacho? Once you've done that, download PClink for G4+ and plug into your ECU. You'll see a list down the left hand side, listing the aux outputs and what they currently do. If you click on one you'll be able to reassign it in the box that pops up.
  6. What's been interesting is that a lot of weight removal so far has come from things I guess I have always considered to be a "fixed" weight. Like, a different alternator and bracket are 4kg lighter. I've never even considered looking at an alternator in this manner before. A lot of people fuss over having XYZ engine because it's 20kg lighter than ABC engine. But then you see people make the benefit null and void by using 10mm thick steel for engine mounts and stuff like that haha. I think a carbon fibre bonnet will make a lot of sense, but the front guards are paper thin and dont w
  7. In other news, I've ended up moving house a few times and various other annoying life things have meant not much time for car stuff. But I've switched over to a dual VVTI motor now. While doing so, I realized how stupidly far forward my engine sits, so I scope creeped this incredibly basic minor upgrade into a full blown overhaul haha. I decided I want to try get the car down to mid/low 900kg without sacraficing its road manners or legality or comfort etc etc. Which is so far looking like it'll be easier than expected. New engine mounts I've made are 6kg lighter than before. A 4-
  8. I've been doing some work on making a crude engine simulator, so if I'm using something else that I want to test that has Canbus I can just hook them up to each other and expect similarish results that my engine would give. So it needs an airflow model. So far I'm just using these simple factors to determine how much airflow the engine could potentially be consuming RPM How much air per cyl at 100% VE How max VE tapers each side of max torque RPM based friction losses Potential horsepower based on mass flow Then I've modelled a throttle body too, which has an exponentially
  9. Davidv

    Injector Timing

    Remember that injector timing only really makes a difference when the injector is open for a very small amount of time. Such as idle or cruising. Because once you're up to say 70% or higher duty cycle, your injector is firing for so long that it makes little difference. I've found that around 400deg is good but on cold starts bringing closer to 250deg (from memory ) meant I could reduce cold start enrichments.
  10. I've wired one up fine, 82mm though. Just using the Altezza e-throttle settings for now, havent fine tuned. But first things I would check, are if you move the throttle plate by hand, does the TPS signal move? When it does the calibration, does the throttle plate move on its own, or not? I'd say the situations you need to look for, are TPS signals not working or maybe the polarity of the motor control wires are back to front.
  11. I remember there was a thread a while back about a particular video card driver that causes these symptoms. I went from a slow old laptop that worked fine, to a flash new one that ran like a dog. But there was a fix for it by changing the video card driver. Are you definitely using the latest PClink version? As I think they also applied a fix for this inside PClink but cant remember.
  12. I've been thinking about this lately, essentially you're trying to build maximum horsepower to your cars/wheels traction curve. So you dont necessarily want more boost in 3rd gear at the same speed as second, you want the same amount of horsepower at that given speed. So I thought controlling the wastegate based on speed vs injector duty cycle would be a decent simulation of horsepower level. If you dont have enough boost in gear X to get to 30% DC on the injectors at 55kph. Here, have some more haha. (and vice versa)
  13. Davidv

    Knock trouble

    I havent had a look in your logs files, but just a thought - your knock sensor is just a microphone, so anything else that happens around same frequency as knock will get picked up like knock. I drove myself mad trying to solve a similar issue, with knock only at certain load and rpm combinations... gave up - months later I found that the springs were rattly and loose in the clutch plate. So if the clutch was loaded up one way or the other it was fine, if it was "coasting" it would rattle and show as knock! Do you think there's possibly anything else going on in the motor/gearbox/
  14. So the % of zone means, how close it needs to be to the center of a cell to count the value example - if half way between one cell at the next, ignored.
  15. If you do that, arent you liable to get e-throttle errors if it over runs past what it thinks is the maximum/minimum allowable voltages? As realistically it's going to overshoot at some times.
  16. One thing that's unique about E-throttle compared to a cable setup, is that its possible to smash the throttle into the end stops and damage the internals of it. (I've got a pile of busted e-throttle gears here somewhere...) So generally the solution is to limit the targeted travel to say 2% and 98% of the actual measured sweep of the throttle. But, its kinda weird looking through the logs when you see it's at 98% when really its 100% as far open as it should be. Or when it's at 2% that's really its closed position. So I know it sounds nitpicky but it would be cool if it coul
  17. You can already do that too. You just open the log file manager tab on the side, and then click in the box for the one you'd like to overlay. Then it shows two lots of graph times down the bottom, you can move one back and forth if you want to try make them line up.
  18. Imagine you had your bare engine block, and you hit it with a big hammer. And it went doooooonnnnggggggggggggggggggg like a bell. That's basically what knock does, and it's what you're listening for. The size and shape of your engine block changes the noise that it will make. (Primarily bore size) So it's not a case of setting it up based on what sensor you're using - it's about matching the sensor to your engine. As a knock sensor is basically just a type of microphone. There's a good article on knock sensing here: https://www.hpacademy.com/forum/webinar-questions/show/083-understan
  19. Hi, just putting together some math channel stuff where the numbers might get quite big. I am guessing that the largest number you can go to would be a signed 32 bit integer? 2,147,483,647 maximum? Or are they a 16 bit signed int? Or a float? something else. Also, what happens when you overflow this number? Will it stay at the max value, or bounce back to zero or a negative value? Thanks
  20. Davidv

    Water Pump PWM

    Ahhh thanks, excited about this now! Will put this back higher up the priority list haha. Does the signal ground wire need to go to the signal ground wire on ECU? Or both to same place? EDIT: Ahhhh no I get it now, feed it 12v constant then PWM on the earth pin back to ECU.
  21. Davidv

    Water Pump PWM

    Hi Richard, Do you mean it's as simple as connect 12v pin, earth pin, and then 3rd wire to to an aux output set to high side direct to ECU? Sounds too good to be true! I was anticipating needing to make a pump controller or using SSR to trigger that 12v signal pin. What do you do with the 4th pin on the pump, I was under impression this is essentially a pump speed tacho signal. So you can wire it to a DI. Is this correct?
  22. Davidv

    Modelled fuel

    Definitely put in the tested value. If you want really good accuracy though then it's good to have a fuel pressure sensor so it can work out the fuel pressure differential accurately. As mechanical FPR can fluctuate a little. Your deadtimes being accurate will be a big make or break for accuracy of your fuel consumption though.
  23. Hey Jenova, I've run a redtop 3SGE for a long time with a G4+. Great engine! You can use the Altezza 3SGE basemap, and then just turn off the exhaust side VVTI options. I can give you some decent maps for cam timing / ignition / etc but will need to know what sort of load axis you are using. (MAP sensor?) If you PM me your email address, I'll send you a redtop specific map that you can start from. But keep in mind there are a lot of variables that you'll still need to fine tune yourself for your particular engine. I would reccomend that you switch to a set of Altezza injecto
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