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 Post subject: Re: S80
PostPosted: Sat Jan 12, 2019 1:16 pm 
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Joined: Mon Jan 16, 2012 1:39 pm
Posts: 118
ECU Model: S40 Pro
Firmware Version: 58
jpr.racing07 wrote:
Hi its not when i remove plug leads its when i remove the Plugs (ie no compression ) so engine turns faster then it synchronises


have you try it with just no leads to see how it performs ?


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 Post subject: Re: S80
PostPosted: Sat Jan 12, 2019 2:10 pm 
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Joined: Sun Feb 12, 2012 5:11 am
Posts: 55
ECU Model: P8 Pro
Its a 6.2 all aluminium sbc red lining at 9000 rpm,S80 waisted spark
Crank trigger ford sensor 36 tooth 1 missing in a single seater a Gould Gr 37


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 Post subject: Re: S80
PostPosted: Sun Jan 13, 2019 4:15 am 
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Joined: Thu Jul 28, 2011 4:10 am
Posts: 922
ECU Model: S100 Pro
Distributor: None-Coil On Plug :)
You forgot to mention that the thing sounds like the Devil himself created it :)

Crank trigger wires the wrong way round?
Gap tooth factor wrong?


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 Post subject: Re: S80
PostPosted: Sun Jan 13, 2019 4:27 am 
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Joined: Sun Feb 12, 2012 5:11 am
Posts: 55
ECU Model: P8 Pro
Hi Rob its just had a big upgrade new heads you can walk down the ports
All titanium valve gear. Gap at sensor .8 of a mm ,checked wires at sensor all correct even tried other way around no different. Is there a minimum cranking rpm for the S 80 too synchronise.


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 Post subject: Re: S80
PostPosted: Sun Jan 13, 2019 5:11 am 
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Joined: Tue Aug 02, 2011 12:08 pm
Posts: 2983
Location: Norn Iron
ECU Model: No ECU
And still no scope trace ?

Any rpm to start, would only really be governed by strength of crank signal...which will relate to speed to a degree with a VR sensor, but also sensor type, wheel setup etc etc.

Hence a scope trace of the signal should tell you everything you need. ( as well as diagnostic display and crank errors etc )


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 Post subject: Re: S80
PostPosted: Sun Jan 13, 2019 5:53 am 
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Joined: Tue Aug 02, 2011 12:08 pm
Posts: 2983
Location: Norn Iron
ECU Model: No ECU
FWIW, my LS cranks at around 145rpm. I've used the same Ford VR sensor and DTA 36-1 trigger wheel I've had since I first started with my P8 back in 2002 or so. ( well I have replaced both over that time, but still same type of wheel and sensor )
So have used identical setups with RV8 TT on P8 and LS with P8 and S80, and currently same trigger setup with my Syvecs.
Why change something when it works perfectly.

Actual voltage of the sensor is pretty low at cranking speeds though.

This log should give some indication. Ignore the voltage scaling on the crank AN15, it's just because it's logged as a raw input which has an internal pullup, 2.5v there would be considered the zero volt line.
But as you see, on initial cranking voltage is very low, rising with rpm and eventually very high once started.

Top graph is rpm, although even here it takes a few teeth before a speed is indicated.

Bottom graph is a pressure sensor in cylinder 1 ( so it is starting and running on 7 cylinders )
So each peak there is TDC on cylinder 1. And although not critical, my missing tooth on DTA would be seen as 67deg in DTA's general engine settings, again you can see the relationship between the two clearly here.
There is lots of other info available, but I've removed it for ease of viewing
Pressure sensor in cyl1 was just playing with a compression test with engine starting and running.

Attachment:
syvecs comp test start.jpg
syvecs comp test start.jpg [ 307.09 KiB | Viewed 697 times ]


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 Post subject: Re: S80
PostPosted: Sun Jan 13, 2019 6:35 am 
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Joined: Sun Feb 12, 2012 5:11 am
Posts: 55
ECU Model: P8 Pro
Thanks steve its booked in to be remapped by Sandy Brown in Feb so least i have it running.i will try and upload photos of crank oscilloscope


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 Post subject: Re: S80
PostPosted: Sun Jan 13, 2019 7:11 am 
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Joined: Thu Jul 28, 2011 4:10 am
Posts: 922
ECU Model: S100 Pro
Distributor: None-Coil On Plug :)
What's this set at?


Attachments:
dta.PNG
dta.PNG [ 9.13 KiB | Viewed 691 times ]
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 Post subject: Re: S80
PostPosted: Sun Jan 13, 2019 7:29 am 
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Joined: Sun Feb 12, 2012 5:11 am
Posts: 55
ECU Model: P8 Pro
Hi Rob its set at 1500


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 Post subject: Re: S80
PostPosted: Sun Jan 13, 2019 12:29 pm 
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Joined: Thu Jul 28, 2011 4:10 am
Posts: 922
ECU Model: S100 Pro
Distributor: None-Coil On Plug :)
And its definitely a 2 wire crank sensor (inductive) connected to pin 12 and a sensor ground?

Does it run fine once it is running?

Oh and I hope you have the traction all configured as you will need it.

and switches
Traction on/off
wet/dry
Launch momentary button
Launch RPM knob
Traction aggression knob


And use the random cut patterns, very effective at containing RPM


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