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Do you see a tach signal in TS while cranking? It will likely read 250-300rpm while cranking. If you do not have an incoming signal it will not start.
How did you wire your tach input signal? From tach wire, from CDI, from VR sensor in distributor, from coil negative (through zener diode and resistor)? |
The MS tach wire (grey one if I remember) is wired to the tach out on the MSD (this also goes into the Porsche wiring harness and feeds the rev counter I think).
So basically the MSD tach signal wire has a small electrical block on it that both the rev counter & MS ECU connect to. I wired it up identically to how it was when working as FrankenCIS. I can defiantly remember seeing the rpm dial on TunerStudio moving but I don't remember what readings. But I will double check the tach wiring and readings first thing tomorrow. |
Gavin, wondering why you decided to move away from the FrankenCIS concept to the full EFI megasquirt?
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Your trigger angle is 37.4 degrees!! Is your trigger that far off??
If you have offset at 37.4 plus hypothetical 10 degrees for idle, that over 47 degrees timing. Don't think any engine would start at that much timing. |
He is still using the distributor to control timing...
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MS ECU is connected to :
Tach out from MSD 6AL Injectors Air Temp Sensor Wideband O2 Sensor Engine Temp Sensor MAP Ground Ignition Live (power) Fuel Pump No timing control or TPS, just fuel control at present. No connection to distributor and no timing control. Still using distributor for timing. I have noticed in the FrankenCIS for Ignition Option/ Trigger Angle it is set to 0.0 where as in my current setup it is 37.4, no idea how that has changed but I will change it back tomorrow and see what happens. |
A few things about your settings you are going to want to change.
1. you fuel tables scale to 300kPa. There is no way you are running 2 bar of boost. Set the top row at your wastegate spring limit and then rescale your Y fuel load bins to redistribute. 2. You have fuel switching enabled. Don't think you will need this at all. Turn it off. 3. your timing table is only scaled to 100kPa. you need to match this to your fuel (VE) table. 4. Disable EGO control. This can be turned back on once you have the car running and very well tuned. 5. Set your Accel enrichment threshold to the highest number you can. This will effectively turn it off. Turn it back on after you have tuned the fuel map. 6. Your AFR targets will need to be revised and you can do this after the car is running and you know what load and rpm you have at certain conditions (idle, cruise, etc). Let's assume that your wiring is setup correctly for now. Generally in this case you are not getting enough fuel. If the car does not start increase the req_fuel value by 0.5 and try again. Keep increasing the req_fuel value by the same increment until the car will start. Once it starts you will have fuel controlled by the value in the VE table and the warmup enrichment (WUE). You started the car cold and you know that the total pulsewidth of fuel is enough to start the car. So as the car warms up it will start to show exceptionally rich. You now have to start the tuning process of adjusting the fuel trim (VE table) at each operating point. Don't start to really modify the fuel map until the car is near full temp or your WUE values are 0 (no additional fuel= 100%). When tuning idle target the lowest MAP reading you can get. Currently you should ignore the AFR reading. Next, you have to tune the free rev zones of the engine. slowly rev the engine with the gas pedal and tune each point on the curve until you can rev the engine. Then bring up the rest of the areas of the VE Table to blend with your free rev curve. Now you are ready to drive. I prefer to manually tune the car at this point with someone else driving. Go slow and methodically hit as many datapoints/bins as you can in the table as you can. You should be able to tell if the car runs well or doesn't . Since you are fuel only at this point changing the trigger angle will not do anything. |
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I drew the line at swapping the meter head off another make/model of car. FrankenCIS was great though, easy install and worked a treat. The issues I had where with the components Porsche installed on the SC as they weren't intended for a turbo setup. |
Great news..........................ITS ALIVE :D
Thanks for all the replies and PM's guys, I really appreciate your help and couldn't of done it with out you. First off I changed all the barometric settings from all 0 to all 100. I also turned off the split table Fuel VE. It then sort of started but died so I manually changed the Req-Fuel setting from 8.6 to 7.0 and it fired up but idled like crap and my AFR gauge was showing 17's So I changed it from 7.0 to 6.5 then 6.0 and so on each time until it idled better and better and the AFR dropped to around 14.5 It was still a bit rough so I then turned off the EGO control and that improved idle again. I also then adjusted the Fuel VE at idle to get a nice sold smooth idle at 14.5 to 14.7 AFR I had been using my dash AFR gauge to this point as the ECU gauge was at least 2 points out for some reason. So I started looking into calibrating the Wideband sensor. After looking at the original FrankenCIS setup it didn't seem to specify a sensor type so I just chose 'Custom Linear WB' and went with the standard settings for that. It seemed to be more accurate but still too far off my dash gauge. So I played with the settings and monitored the results until the ECU AFR gauge was as close as I could get to the dash AFR gauge. End settings where : Point 1 - Volts 0.0 = AFR 10.0 Piont 2 - Volts 4.0 = AFR 18.5 I also copied over the 'Calibrate Thermister Tables' settings from FrankenCIS. I then turned back on the EGO control and it started to idle a bit rough again so I had to tweak the Fuel VE table at idle again to get it smooth. It all seemed so good that once warmed fully I went for a very short drive and even had the Auto Tune running :) It defiantly still needs some of the settings tweaking but its working. The throttle seems very sensitive & lighter now compared to CIS. I did managed to get a little boost upto about 4K rpm and the AFR was showing a steady 11.7 |
Glad you got it going! now time for EDIS!
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Congratulations!
the 14point7 Spartan wideband should be 0v = 10.0 5v = 20.0 so your custom settings are only out by a little bit |
nice work Gavin! I notice your injectors are set to alternating. Mine are set to simultaneous. I was wondering how this affects tuning....
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Gavin, glad it's running. Its always a good feeling. Super happy for you.
Please heed my warnings. Do not turn on EGO control until the car is fully tuned. KEEP IT OFF. The correction algorithms can give you false feedback when you are trying to tune. EGO correction is not a substitute for tuning. Your tuning process will take a lot longer and not be as accurate if you turn these corrections on now. I am not sure why you were seeing the AFR enrich by reducing the req_fuel. That is a global multiplier. Lower req_fuel is less fuel. higher req_fuel is more fuel. What was happening is that you were so rich you could not burn all the fuel and you have a false lean condition. Eventually you leaned it out to the point where you were closer to some mixture that would actually ignite. I suggest you do some more time reading the tuning sections in the manuals before you start changing parameters. I don't want to see you have an issue now that you have reached this milestone. Looking at your VE tables your low rpm, low MAP bins have very high numbers. This is why the car was so rich. You will likely have to decrease the VE bin values by somewhere around 1.44X (0.69) and get your req_fuel value back up to your starting point of 8.3. What will happen is that you will be pumping a lot of fuel under boost. The max value you can enter on a VE table is 255. I guess you will hit that value and not have enough fuel flowing. So you increase the req_fuel and decrease the VE table by the same amount. This is part of the scaling that needs to be setup for your particular engine. |
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Common plenum and mild cams work well with either simultaneous injection. ITBs and bigger cams with more version often need alternating and more squirts to avoid fuel loss due to reversion and puddling of fuel when it comes back down to the intake valve at low speed. |
I found my engine loves a richer idle below stoch.
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Gavin,
As Tippy said, you will want to be richer than 14.7 at idle. Something like 13.5 - 13.8. The engine will run cooler at idle with a richer AFR. What is your timing at idle with the distributor. You need to be 10 to 12*. Too much advance at idle can cause to the idle to hunt. Does your MSD retard the spark with increasing boost? |
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That just doesnt sound right. Mine idles like a rock at 14. At 8, I'm shocked the car even runs...it shouldnt. That rich, I'd expect a false lean reading due to the massive amount of unburnt fuel.
You sure your sensor is OK? |
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