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Steve

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Posts posted by Steve

  1. You could most probably benefit from better resolution at small throttleopenings in your fuelmap. Instead of 0 ,5 ,10 and so on you should space them closer down low. Like 0,  2,  4, 6, 10, 15 and so on. There are BIG changes in the airflow at small openings requiering finer adjustments of the fueling

  2. Ilias. You seem to have some groundissues affecting your sensors. Look at the ECT as an example

    image.thumb.png.63d1f1590101e26b5fafa63cafd98f14.png

    Also your 4 thoot triggerwheel doesnt seem to play nice. Also see the warmup enrichment going active again because of the sensor readings.

     

    Are your fuelpressuresensor hooked up? The sensor is static.

     

    Your lambdasensor seems to of line now and then. Like where the marker is in the next pic.

    image.thumb.png.934870f618bdfeedce60759b1928e4b7.png

     

    image.thumb.png.411f2711ffadef0cd58b8db0e00be98b.png

    Also idle target is set to 1200rpm and your idle rpm lockout is set to 800rpm. Which ads up to 2000 rpm

  3. I got mine before Ross started making it for the VG. That only happend after i had a "campaign" going to open peoples eyes in the z community about this problem. Mine is actually one of the "Race dampers" from ATI that i custom ordered directly from ATI. Took me 6 months to get it and cost me about 1200 usd at the time. You are better of with Ross. They do not make 60-2 setups, no.

    Sensor brackets you are going to have to fab up yourself. No premade kits for sale as far as i know. Yet.

    You dont NEED a new CAS pin but it doesnt hurt either. No benefit from it though. Other than longer life i suppose.

    Stock belt is fine.

     

    Yeah Viritual Dyno is useless with the stock CAS. Been there done that.

  4. Haha. As i understand it the stock ecus dont code them like the aftermarket ones do. Ie they dont read the 360 slots as position the way one would think. Its pretty trick as i understand it. And i guess it works good "enough" for stock cars as they was intended to be. But as soon as you start modifying stuff all goes down the drain. But i agree, putting it at the end of a cam connected to the crank via a rubberband seems somewhat... out.

    I`ve heard about several tuners that simply refuse to tune them unless triggered properly

  5. Yes Miguel, thats my take on it all.

    You can use the single "cam tooth" on the disk as camsynk yes. Thats what im doing myself.

    Stevie, seems the WPS500 got a responsetime of 100 usec. So quite a step up from 1ms. https://www.picoauto.com/download/documents/datasheets/MM073.en_WPS500X.pdf

    Yeah Western Union really does not sit well with me.

    To be honest im no so sure high RPM tests are very usefull anyway. Exept of course on a LIVE cylinder. But thats another topic.

    Would be awsome if the ECU manufacturers implemented that sort of thing, However they would need to drasticly up their samplerate for it to shine. A bit of sidetrack. Plex-tunings bigger dash can read and log in cylinder pressure transducers. Which is absolutely awsome!. No experience with it myself though. Just drool over it from time to time...

    EDIT: Miguel, to expand a little bit. When my own car was at its worst, and i decided there was no way around a cranktrigger, i could also feel it in the car. It was like power- less power - power - less power - power. I didnt loose "all" power, but from the looks of your logs, neither do you. I could actually also see it on my tachoneedle jumping around a little (there is a limit to how fast it can react though).

  6. Wow. I have never seen that software before. Looks pretty cool.

    The pico software wont do all that automatically. It wont lay it all out in plain "text" for you, rather you will gonna have to interpret the data you collect yourself. So i guess you will have to understand "yourself" what is or should be going on. There are softwares/scripts/addons (or whatever you want to call it) available that helps the process though

    Yep its pretty pricey the WPS. I would love to have one or two more but at the pricepoint its at its pretty far down the priority list.

  7. There we go.

    Granted the RPM line itself is smoother than what i suspected. Could be because of slow logging rate. What gives it away to me though is looking at the RPM ROC parameter. Thats RPM Rate Of Change. How much the RPM changes over a second. Anything over 0 meens RPM is rising at a certain rate and below 0 means its falling. We bot KNOW you are accelerating so the CRANK is certainly not slowing down, right? However you can see i both my screenshots that the ECU is logging a very erratic RPM ROC. It should ALWAYS be on the positive side when the engine is accelerating. That IS the CAS flapping around. There is also some knock registered in one of the logs. I bet because of unstable timing.

    image.thumb.png.6f7de243860a2f86e97a981322c3e7ef.png

     

    image.thumb.png.2cffda795330bac1548da34ad1ce8208.png

     

     

    Never mind me saying it looked smoother than expected. I just wasnt looking close enough at it. Its actually one of the worst i have ever seen

    image.thumb.png.aadcc2094a2ba83789e06965de149b94.png

     

    You sir, are going to install a cranktrigger before it breaks down completely

  8. Yeah... With those downpipes and an open after them there should be no restrictions to speak of anyways. So i guess we are ruling that out now.

    So where does that leave us. In the logs i saw so far i dont think i actually saw the lambda go lean anywhere, which it should do if there really was a missfire (unburnt air passing thorugh the exhaust). Also all the logs showed a picture perfect RPM line which to me and what my experience with the CAS tells me there is heavy filtering involved. I would still love to see an unfiltered logfile that shows HOW bad/or little scatter there really is on your car. Thing is that no matter how much filtering is applied, the craziness is still going on physically between the CAS and the crank. I think im back at my original thought when i saw your post. Severe timing scatter.

  9. Haha, yes that transoducer isnt very helpfull if you want to see details or meassure degrees or anything lke that. That said. Here is a few shots from your 7200rpm open exhaust file.

    image.thumb.png.09c0f9eaf6c984bfc5906d23cb316429.png

     

    Early in the log before reving it. The line represents 0 psi and you can clearly see the vacuumparts and the little rise on the exhauststroke (that may or may not be normal).

     

    In the next picture i cant make anything out really. its at max rpm and either the sensor cant keep up with ANYTHING or there is actually positive pressure all the time Line is still at 0 psi

    image.thumb.png.56fcbeb189cc70898a944153a4bf1ff3.png

     

    On this two last ones though where the rpms are coming down but not stil at idle (i changed the scale a bit to show it clearer). One line is still at 0 and the other is at max measured vacuum. (-5.6 ish psi).

    On the bottom one i moved it to the max pressure in the exhaust stroke. and it shows over 8 psi

    image.thumb.png.f2b7597fa1300ac6f447fa284a34746a.png

     

    image.thumb.png.9beb271e01a03a1b7c6bd3331afa6105.png

     

    So obvious question now; do you still have the PRE-cats on the car??

    Regarding timing it should ot affect it as the cas is on the exhaust and vtc on intake. Max pressure should still be on tdc.

    I have personaly measures over 7 degrees fluctuation between cranktrigger and camtrigger on my car. Food for thought.

    Yeah happy x-mas bud!

  10. Have not looked at the log yet but... Check if you have the same voltagedrop at the feed wire on the injector itself. Could be that your ecu ground isnt good enough and you get a voltagedrop seen only by the ecu. The ecu would then up the pw on false data making it go rich

  11. Yeah the pico software is awsome. One of my scopes is the 4425 and it is an eyeopener.

    No you are good with elevated RPM`s. You probably would be good enough with a few snap throttles to get what you want.

    To be honest i totaly forgot about the turbos. That said, i just went out to the garage and did a log on my ecu. It was a cold start with elevated RPM`s and i just did a few seconds worth. BUT my exhaust backpressure sensor read about 0.8 Kpa (at max during this short test) higher than the key on engine off reading. Which is roughly 0.1Psi.... For what its worth. Thats sensor reading from the ECU, not scope with pressuretransducer. Also i have a pretty open exhaust and not stock turbos, which probably makes it a little difference to yours.

    Yeah pops and bangs arent that popular amongst cats of any kind :)

    Lets hear how it goes!

  12. You are right. those captures are horrible. Not sure if its the scope, software or the sensors samplerate thats the issue but its really not very usefull. May i suggest the pico 2204a as a minimum for your next scope should you ever get another one. The pico software is amazing and all their hardware is of good quality. Here is a small comparison between it and a bigger brother.

     https://www.youtube.com/watch?v=n7IGce393FA                                                                  

    ' You didn't by any chance try capturing backpressure at a higher RPM? Like 3000-3500rpm or something. Those broken cat internals might just be further down the system making a restriction there instead. If no cats or any restrictions are there then you shouldnt read any backpressure at all really. Other than your less than ideal triggersystem your comment about you starting to see this problem with another ECU AND that you had cats on your car made me sway towards a restriction in your exhaust. More so than a problem with the ecu or tune. Cats need certain conditions to work and im not sure your tune was up to keeping it alive. Or your lambda sensor was affected by ground offset and your AFR might not have been what you thought it was which in turn killed the cats eventually. Stuff like that.

    I still think you should try disconnecting the cats and run an open exhaust eliminating a clogged exhaust. Just be careful as you would be changing the engines VE doing so. Maybe set up a limiter protecting against lean conditions to be safe.

     

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