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downtrail

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Everything posted by downtrail

  1. Just short out the first resistor in tachometer signal input. That chip is fine with a 12v square wave so just feed it directly from link output.
  2. We use design spark electrical for doing electrical drawings.
  3. I use press and laser in Hamilton for my bits. Not sure they do alloy tho. Always good prices for steel parts tho.
  4. Have you made sure the polarity of the reluctor is correct? If you have it backwards you will encounter many headaches.
  5. Hey mate. Yes i can take a look for you if youd like. Get in touch via facebook page. Www.facebook.com/cole.customs
  6. I normally just mount them all on a piece of perspex and screw it in somewhere. I have actually bought in a fuse box same as the one roman put up. Just got it bare with terminals and have to say its not bad at all and im sure itll find its way into something.
  7. Yes the feed ro injectors need to be switched with ignition. If they have const bat voltage it will back feed the ecu through the flyback circuit and cause weird stuff to happen. Just put a relay in the 12v feed to injectors and switch it with ignition.
  8. You will want to raise the fuel pressure with boost as there is a positive pressure now being applied to the fuel injectors outlet. The extra fuel pressure is to over come the pressure difference across the injector. So to make speed density tuning work well and be predictable. Yes you should have a boost refrenced fuel regulator.
  9. Does the speedduino software have a setting called tooth skip or something like that under cranking settings. It makes sure it counts the missing tooth a certin number of times before engaging the ignition. Pretty much helps it stabilise and figure out where it is while cranking before applying fuel and spark.
  10. Thought about doing something like that but never really came up with a clean way of getting the cylinders into the gearbox without some major modifications. If it was a cable shifter for a fwd by all means hook straight onto the the cables or gearbox but for this box think itll be easiest to run it how it is. Hardest thing is consistancy ive got a bunch of magnetic sensors to go onto the cylinders so the software knows what gear it is actually in so it can react to a missed gear or wrong gear type of thing.
  11. Buy a bread board and some jumper wires to make it easy to prototype diffrent projects. Youll thank me later lol 3.3V/5V MB102 Breadboard power module MB-102 830 points Solderless Prototype Bread board kit 65 Flexible jumper wires http://s.aliexpress.com/ryIrUJnY
  12. Even started on a program to setup all the timings via a serial connection.
  13. Almost anything is possible within reason. I started on this project a while ago using an arduino uno. It now embedded on its own pcb and been through many revisions and still not finished haha. <media> </media>
  14. Yeah sorry mate nothing good. Problems with oversized injectors are with the ecu unable to control low pw well enough causing poor injector control. Most modern ecus have pretty good injector control. Another issue is poor injector data which leads to poor fuel calculations which leads to poor injector control. Which leads to poor idle quality.
  15. Most motors will respond better with more fuel whilst warming up. at around 13.5:1 -> 14.0:1 at idle this can be pulled at around 40->50 deg coolent temp to get you to 14.7 or where ever you idle at. The reason you have noticed the injector pw increse as you increse as your throttle position is that you are introducing more air into the motor. You will notice cranking vaccum drop away and more fuel injected because of this. So you have identified that you require more fuel to get it to start with no throttle opening. If injector pw were to remain constant whilst opening the throttle and this got it to start you would be too rich as you need more air to get the required mix to ignite.
  16. And dependent on the wideband you are using and where it is placed you may need to go the cranking by feel and smell rather than relying on an accurate reading from the wideband unit. Slow exhaust speeds can do weird things in certain setups.
  17. if you need to open the throttle plate whilst cranking to get it to start you are too rich. You need to tune the fuel table at running temp with no corrections applied. this means looking at the temps and watching what they are doing and waiting if too high or low to make you next changes. once you have hit your desired afr then you can start working on corrections such as inlet air temp getting hot. this is best done with logs as its hard to see in real time. adjust to meet the desired afr at those temps only do not touch your fuel map. same goes for the warm up enrichment. you will need to start it whilst cold and adjust the warm up curve until your desired afr is met. perhaps a little richer whilst stone cold is normal. but there will be a point where you reach your target afr and the enrichment table will be at 100%. Same thing apples to cranking and after start enrichment these will generally be temperature based as well so you will need to do it at a few points to get it smooth. start with low numbers and add fuel for these do not start high and try go the other way you will run around in circles. As i said before if you need to introduce extra air you have too much fuel. If it coughs and splutters you need to add fuel(or your sooo rich you've fouled the plugs)
  18. I'll have a dig through my box of random injectors later
  19. have done the same for the tops but don't like it as you end up needing 2 of these really small o rings that barley go into the rail it ends up relying on you pulling the rail down tight enough on the injectors to hold them in place but thats not how they should be seated. Better of with the 14mm - 11mm adaptors or re drilling and reaming your rail if there is enough meat to do so.
  20. for the bottoms we usually go get replacement o rings that will work with your manifold / injector. usually involves going to a seal shop with both parts and working it out there.
  21. Yes but it is very low resolution. 2 teeth per crank revolution. Not good enough for what I wanted to do with that motor.
  22. Its a giving that timing will wander on any ecu. And with certain trigger setups timing will wander more than others. It comes down to how quickly the ecu can decode the trigger routine. It will more often retard its self. So theres normally setups to combat this usually called hardware latency. You can use this to offset the amount of retard happening at high rpm due to the time taken for the ecu it's self to figure out where it is in time and space. Now if your talking timing scatter thats a whole different beast altogether, and is usually caused by too higher resolution of the trigger wheel. The Nissan 360 deg cam sensor is notorious for this problem. Take the combination of a timing event happening every degree and a heavy valve train rocking back and forward pushing and pulling on the cam belt and all of a sudden your timing goes nuts as the cam sensor bounces back and forwards with it. So if you look at my wheel and take into account that yes there is slight movement due to the rubber isolation but that movement isn't enough to cause a significant change in when the trigger event should happen due to the resolution of the wheel timing scatter will not happen with it.
  23. Ha yeah I though the same at first but the signal scopes out cleanly to red line 7500rpm for that motor, Yes it is a balencer type, Initially I had A few problems with extra trigger events but that was just due to the air gap being too small. So the sensor was moved back half a mm from where i had it and it has been fine. This is the rest of how its set up. Here is the cam. Just syncs on the head of a cap screw.
  24. You would have space out everything else on the motor to match. Alternator, Waterpump etc, If your going to add on a ring i'd make it fit the o/d of the rear flange and add it on that way. means you'd have to make new timing marks but no big deal. Or just get the tooth pattern machined into the rear flange.
  25. Use a single tooth on cam for sync. Then you can run direct spark and sequential injection.
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