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 Post subject: Re: Our little cultus racer
PostPosted: Tue May 15, 2018 2:57 pm 
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Joined: Mon Dec 19, 2016 10:40 am
Posts: 389
Location: NZ
yes adam or simon said from Link that the sync could bounce all over the place and it won't matter at all....its not something that has to be super accurate it just has to tell the ECU where it is approximately in the cycle...(not telling you how to suck eggs as i know you already know this stuff)

What was interesting to me and Im glad I asked is that Simon said if I have put my SYNC at TDC ....which i was very careful to do...lol.... 8-[ that I must not have the missing tooth on the trigger wheel in the same spot...or at least the CAS pointing to the lost tooth at that time. I did not know that at all....he said turn the CAS away from that point so that they don't happen together...so I have turned it 90 degrees.


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 Post subject: Re: Our little cultus racer
PostPosted: Tue May 15, 2018 4:07 pm 
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Joined: Tue Feb 23, 2016 5:38 am
Posts: 241
Location: Amberley
I guess that makes sense when you think about it. If the sync is bouncing around on the end of a rubber belt then sometimes it might be before the ref missing tooth and sometimes after. Not hard to see why that wouldn't work so well.


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 Post subject: Re: Our little cultus racer
PostPosted: Tue May 15, 2018 6:54 pm 
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Joined: Mon Dec 19, 2016 10:40 am
Posts: 389
Location: NZ
i think thats why we set the "offset" in the ECU? makes sense...tell the ECU where the CAS is.

so today i opened the bonnet of the race car after not doing much for a while....(stupid grass)
and all this fell out....what have I got myself into.... 8-[ :shock:

BTW...it weighs 6.5 kg!


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 Post subject: Re: Our little cultus racer
PostPosted: Tue May 15, 2018 8:49 pm 
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Joined: Tue Feb 23, 2016 5:38 am
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Location: Amberley
I suspect it'll have two offsets that you'll need to configure. One tells it where TDC is in relation to the missing tooth, the other is the position of the sync in relation to the cylinder firing.

I guess rewiring might save some weight but the best thing is having a new neat and tidy wiring loom. There's nothing worse than heaps of messy wiring with most of it no longer required.


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 Post subject: Re: Our little cultus racer
PostPosted: Tue May 15, 2018 9:49 pm 
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Joined: Mon Dec 19, 2016 10:40 am
Posts: 389
Location: NZ
Yep that is definately the main point. Lot less clutter under the dash and in the engine bay. Not going to hide the ECU in the corner where I can't get at it.

Only have to keep the alternator wires, and the main feed to the starter...plus the brake lights and rain light. Plus wipers. And fan for air on windscreen.

Radiator fan will have a relay and be controlled by the ECU. All other engine functions have outputs from the ECU.

Some of those wires in the loom from the engine bay are hard and brittle.

Looking forward to setting it all up.


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 Post subject: Re: Our little cultus racer
PostPosted: Mon May 21, 2018 11:42 am 
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Location: NZ
quiet here lately...but I have amassed the necessary parts for the project.

Ill start the job soon as I have other stuff to do meantime...but with the rain comes shed time...so ill post progress soon.

going to be a fair amount of work by the looks of it!


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 Post subject: Re: Our little cultus racer
PostPosted: Wed May 23, 2018 8:10 pm 
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Joined: Mon Dec 19, 2016 10:40 am
Posts: 389
Location: NZ
Bit of progress today. Trigger wheel attached to pulley. Starting the coil on plug mod. 54mm Bosch electronic throttle body fitted to manifold.

For those interested. The missing tooth is in line with the pulley key. I have to balance the lot. The CAS is 90 degrees ATDC. I have been told by the link support people that putting the time that the ECU senses the missing tooth 90 degrees or so away from TDC ensures the ECU gets a good signal. I asked how that would make a difference....it's because high compression 4 cylinder motors slow down especially around TDC and a slightly flat battery won't help that....this can cause the engine to not start. At 90 degrees away....all Pistons are mid bore and at a better speed for the ECU....I didn't know that... 8-[


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 Post subject: Re: Our little cultus racer
PostPosted: Thu May 24, 2018 7:50 am 
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Joined: Tue Feb 23, 2016 5:38 am
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Location: Amberley
Looking good.

Does that mean the crank is coming out for balancing or wait and see?

I see the new intake pipe has one ancillary air connection, what are you going to use that for? Are you going to run any form of ISC? I'm guessing you'll mount the iat somewhere in the intake pipe?


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