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good work on the crank signal fix i don't know how it differs from yours, but heres the tacho circuit i used, (assuming its a 3 pin coil pack, two earths, one +12v feed) same as you it was a -ve coil signalled dash Coil A (neg)----[470R Resistor]----->----[470R Resistor]----->|(1N4005 diode)------> To Tachometer ----[1K Resistor]----[+12 Volts] Coil B (neg)----[470R Resistor]----->----[470R Resistor]----->|(1N4005 diode)------> To Tachometer stripes on diodes towards the coil pack. the two "to tachometer" are where the two circuits combine. as you can see i tied the tacho end to 12v, then placed a diode to each one of the coil inputs, current flows when the anode voltage is greater than the cathode (coil input is connected to ground) but effectively drops to zero volts because of the resistors stacked, giving you your on off spike like -ve side of coil. Using the two diodes gives the correct frequency of pulses for the tacho to be accurate (edit, also stops current from one coil disappearing down the other and tacho reading nothing at all)
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Last Edit: May 4, 2014 12:44:20 GMT by darrenh
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I used to get a similar problem with the crank sensor on my old 21turbo.
It would be fine til it got too warm then it would cut out.
I carried a water pistol for a while, and used to hop out and give it a squirt when it got too hot. :-)
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Koos
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Hahaha. I can see so many confused motorists around you...
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goldnrust
West Midlands
Minimalist
Posts: 1,880
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Haha that's great Mark, if it continues to be a problem I'll steal that trick! Darren, I'll give that circuit a shot. It's fairly similar to the one of the Megasquirt suggested options, just with the added 12v pull up.
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eurogranada
Europe
To tinker or not to tinker, that is the question...
Posts: 2,552
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Great to see you've got it squirted!
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goldnrust
West Midlands
Minimalist
Posts: 1,880
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Tried that circuit Darren, unfortunately no joy. Then I tried this suggestion from the Megasquirt Extra manuals: And… Wahey! Success. Interestingly now I have the digital RPM reading from the MS to compare it to, I can confirm the Tach reads low, as I'm hitting my 6500 RPM rev limiter when the tach only reads 6k. Not that it really matters!
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If it's like the Tacho on my Beta (with Jenvey TBs & an Emerald ECU) it's just a bit slow and can't keep up in 1st and 2nd.
3rd, 4th and (ahem) 5th it hits the limiter with the correct revs shown.
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goldnrust
West Midlands
Minimalist
Posts: 1,880
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It was in 3rd and 4th, I know what you mean though, 1st is so short the needle has only got round to about 5k before it hits the limiter!
Beta on throttle bodies…. sounds cool, got a link to a build thread?
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cool, got it working so no point trying to fault find mine (there's a few instances that i know it wont work, like if one were to think what's the point of two 470s in series i'll just stick one 1k in there. something to do with high voltage flash over where it acts like the resistor isn't there, and also kirchoff law, which i don't fully understand myself) seconded the beta thread
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I've used (carefully didn't say wasted ) most of the day at work reading this. I'll do a bit of work now. Fantastic thread - thanks for sharing
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goldnrust
West Midlands
Minimalist
Posts: 1,880
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Cheers Xenocide (there's a few instances that i know it wont work, like if one were to think what's the point of two 470s in series i'll just stick one 1k in there. something to do with high voltage flash over where it acts like the resistor isn't there, and also kirchoff law, which i don't fully understand myself) Oops…. I looked at your diagram with my amateur electronics knowledge and arrogance and went 'meh why bother with the pair of 470s, I'll just use these 1ks I've got lying about… Oh well it's working now! The old girl did start running like a bag of nails on the way to a clients this morning. So I swore at it, and spent most of the day thinking about how cold Delta Integrales are and wondering if they break down less and whether it would be a more sensible daily driver. haha. Then before driving home I popped the bonet up and the problem made itself quite obvious by the large rhythmic hissing noise, one of the cheap Halfords T pieces in the new Megasquirt vac line had broken, resulting in a major air leak on the intake manifold and no vac advance in the ignition timing. Bodged it with tape to get home, then replaced it with a spare once home (with a less aggressively tighten zip tie too!). Went out to Sainsburys to buy food for the week and it ran better again. So I forgave it a bit, got a very love hate relationship with this car at times The ignition map is coming along, though it's now looking a bit choppy where i've been trying things out. The standard timing was 8° static, mechanical advance to at total of 22° but 2600rpm. I found the car ran best for me at 11-12° static, so with distributer advance that would have been maxed out at 25°. Thats where I started, then added upto 10° of vac advance in cruise cells, which made a noticeable difference. Then I flattened the curve at closed throttle type vacuum (~70kpa) around the idle cells, which has helped it drop smoothly and quickly back to a stable idle, rather than hanging like it used to sometimes. Finally I've been experimenting with adding extra advance at full throttle (100pka) before, and after max torque. Max torque is about 4.8-5k, again with positive effects. Theres some good extra mid range power which is nice for motorway overtaking, and it's definitely pulling out past 6k better than it used to I'm probably just gonna smooth this out a bit, but not push it any further till I've got other modifications and can get some dyno time to set it up properly.
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Haha that's great Mark, if it continues to be a problem I'll steal that trick! Darren, I'll give that circuit a shot. It's fairly similar to the one of the Megasquirt suggested options, just with the added 12v pull up. Make sure the pistol is brightly coloured... I used the same diode setup as posted by darranh..the one from msextra page. Works a treat. I also mounted the ignitors externally on a heatsink. They do get warm. This also meant no high currents running near the other components. Possibly overkill but works really well and great spark.
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Last Edit: May 6, 2014 20:44:18 GMT by yoeddynz
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goldnrust
West Midlands
Minimalist
Posts: 1,880
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Sorry missed these on the previous page…. hi great work! I'm also a fulvia owner and I've had a good old read of you're build, I'm particularly interested in the megasquirt installation. I think the york red is a great colour when it's polished up, really shows off the lines! Cheers Kev, yeah I'm really happy I made the right choice with the colour in the end. Lets hope I got the lines finished sharp enough to make them worth showing off! I was worried that the Fulvia was going to be tricky for Megasquirt because of its narrow v4, but after finding out it's still an even firing order, with the crank journals being offset, it's actually been the easiest and most straight forward Megasquirt build Ive done so far I'm kinda surprised I can't find any info about anyone else using Megasquirt on a Fulvia aside from a small reference in a couple of Paul Leclercq's blog posts.
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goldnrust
West Midlands
Minimalist
Posts: 1,880
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I was only joking - it doesn't need more lows anyway. Adjustable dampers sounds like a good idea just so you can set it up exactly how you want. Sounds like you're making great progress with the megasquirt. I guess it helps having done that stuff before. When are you planning on getting it doing the squirting? You say it doesn't need any more lows…. It does need more rake, every time I look at it I think it looks tail down. So either the backs gotta come up or the nose down, this being retro rides there's only really one way forward….. As for doing the actual fuel injection stuff, kinda as and when I have the time and money. I'll start collecting parts over the next few months. The fuel system is going to need a bit of thought, as I don't want to loose much/any boot space but with the stock tank I will need a swirl pot set-up. I've been thinking about trying to find an injection tank from a different car which I might be able to fit?
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ulver
Part of things
Posts: 67
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Enyoying the thread as ever. Here's a picture I took of a rather tasty Fulvia at the weekend for some extra mojo.. Fulvia HF by ulver01, on Flickr
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'99 Alfa Romeo 156 2.5 V6
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goldnrust
West Midlands
Minimalist
Posts: 1,880
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Haha that's great Mark, if it continues to be a problem I'll steal that trick! Darren, I'll give that circuit a shot. It's fairly similar to the one of the Megasquirt suggested options, just with the added 12v pull up. Make sure the pistol is brightly coloured... I used the same diode setup as posted by darranh..the one from msextra page. Works a treat. I also mounted the ignitors externally on a heatsink. They do get warm. This also meant no high currents running near the other components. Possibly overkill but works really well and great spark. It seems I may have tried to be too clever for me own good and messed up that circuit, but no matter the variation using a relays coil seems to be doing the job just nicely. Just wish I could more finely adjust the tach output speed from the MS so IO could take the inaccuracy out of my tach! haha. Have you played with the dwell time much Alex? I mounted my coil drivers on an external heatsink when I did the Rx7's Megasquirt, as I was worried about them getting warm, but once I'd to the dwell set-up right I don't remember them being any more than luke warm to the touch. I've got my coil drivers mounted in the roof of the megasquirt case, suing the case itself as a heatsink.
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kev13s
Part of things
Posts: 96
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Sorry missed these on the previous page…. hi great work! I'm also a fulvia owner and I've had a good old read of you're build, I'm particularly interested in the megasquirt installation. I think the york red is a great colour when it's polished up, really shows off the lines! Cheers Kev, yeah I'm really happy I made the right choice with the colour in the end. Lets hope I got the lines finished sharp enough to make them worth showing off! I was worried that the Fulvia was going to be tricky for Megasquirt because of its narrow v4, but after finding out it's still an even firing order, with the crank journals being offset, it's actually been the easiest and most straight forward Megasquirt build Ive done so far I'm kinda surprised I can't find any info about anyone else using Megasquirt on a Fulvia aside from a small reference in a couple of Paul Leclercq's blog posts. I'd would be keen on doing something similar in the future alright but for now I've got a simple pertronix electronic ignition. I bought my car as an absolute basket case 6 years ago and have yet to get any driving out of it so the main objective is to get it on the road. I'll add the extras later.
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ulver
Part of things
Posts: 67
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Sorry missed these on the previous page…. Cheers Kev, yeah I'm really happy I made the right choice with the colour in the end. Lets hope I got the lines finished sharp enough to make them worth showing off! I was worried that the Fulvia was going to be tricky for Megasquirt because of its narrow v4, but after finding out it's still an even firing order, with the crank journals being offset, it's actually been the easiest and most straight forward Megasquirt build Ive done so far I'm kinda surprised I can't find any info about anyone else using Megasquirt on a Fulvia aside from a small reference in a couple of Paul Leclercq's blog posts. I'd would be keen on doing something similar in the future alright but for now I've got a simple pertronix electronic ignition. I bought my car as an absolute basket case 6 years ago and have yet to get any driving out of it so the main objective is to get it on the road. I'll add the extras later. Build thread?
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'99 Alfa Romeo 156 2.5 V6
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kev13s
Part of things
Posts: 96
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A bit late for a build thread now unfortunately, I will throw up a thread of snaps when I get my old desktop up and running.
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Good news here!
I love the dash pic. Although bad quality, it oozes ambiance.
For the fuel pump, check the Toyota MR2 Roadster 00-05 pump or the Celica 190 VVTI one. I'm told that these don't use a return line.
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Click picture for more
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