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FrankenFerrari - V12 ferrari 308 part 4
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Author:  TheDarkSideOfWill [ Wed Oct 07, 2020 5:31 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4

Isn't 20 kind of high for idle?

I guess this is just the "get it to make noise" map, so there are plenty of changes left to make.

Author:  mk e [ Wed Oct 07, 2020 5:55 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4

TheDarkSideOfWill wrote:
Isn't 20 kind of high for idle?

I guess this is just the "get it to make noise" map, so there are plenty of changes left to make.


Yes, there is a bit much at cranking too....not sure why I did that. The WOT looks about right but yeah, I'll pull a bit out at idle and cranking before next run. The fuel pump was also failing at the end, I have a new one but I'm sure it led me to bugger the fuel table a bit....it is pressure corrected and that worked great so I wasn't sure what was going on but once the pressure is down below 10psi when its supposed to be 60 well....I'll take a look at that before next run too.

edit.....I'm trying to remember but I may have bumped up the ide time to keep it running....I'll need to go back and look at the files, I saved what was running most every time it ran which is good as its been 3 years :o

Author:  mk e [ Wed Oct 07, 2020 6:05 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4

yes, the original "base" map looks better, not sure why I changed it. Now that I know idle is around 50kPa it looks to stay at 10 to too high a pressure but other than that the old map looks good.

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Author:  mk e [ Wed Oct 07, 2020 6:13 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4

found where my 24 degree came from I think....found a 20/21 anyway

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Author:  MerlinTech [ Thu Oct 08, 2020 6:48 am ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4

I have found the SIM 6 wants a lot of timing at idle. On my Type 4 it was great with total and it does want a lot of idle timing, just not 20 degrees as SIM said.

Author:  mk e [ Thu Oct 08, 2020 10:32 am ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4

MerlinTech wrote:
I have found the SIM 6 wants a lot of timing at idle. On my Type 4 it was great with total and it does want a lot of idle timing, just not 20 degrees as SIM said.

You have a distributor or that right? That is one of the weakness of a mechanical distributor, its nearly impossible to design one that gives you modest timing when the throttle is closed and you're idling that bumps the timing as to open the throttle but haven't really added rpm yet with is easy to do with an electronic system and really helps the engine build rpm quickly....just snappier off idle.

Author:  mk e [ Thu Oct 08, 2020 10:39 am ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4

Got up the nerve to talk to Lana about car spending last night.....block and crank can go out next month. It will take me about that long to get everything ready anyway so no new delay I don't think and about election day there will be multiple reasons to rejoice :)

Author:  mk e [ Thu Oct 08, 2020 10:08 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4

Did some very important work on the block tonight. Last time I did a really poor job cleaning up the cast surface on the side of the block so I spent a few hours making it a bit nicer, not perfect but acceptable.

I also need to clean up where the liners sit and get the new liners finished and in the block along with the main bearings so its ready to go the shop.

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Author:  MerlinTech [ Fri Oct 09, 2020 7:06 am ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4

mk e wrote:
MerlinTech wrote:
I have found the SIM 6 wants a lot of timing at idle. On my Type 4 it was great with total and it does want a lot of idle timing, just not 20 degrees as SIM said.

You have a distributor or that right? That is one of the weakness of a mechanical distributor, its nearly impossible to design one that gives you modest timing when the throttle is closed and you're idling that bumps the timing as to open the throttle but haven't really added rpm yet with is easy to do with an electronic system and really helps the engine build rpm quickly....just snappier off idle.


I will have to refresh my memory and check the timing again. I ran the distributor on my machine and knew what advance I had available, from there I set the idle timing. It liked it a lot, really nice idle and great off idle response. Old school can work sometimes.

Author:  mk e [ Fri Oct 09, 2020 7:23 am ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4

MerlinTech wrote:
I will have to refresh my memory and check the timing again. I ran the distributor on my machine and knew what advance I had available, from there I set the idle timing. It liked it a lot, really nice idle and great off idle response. Old school can work sometimes.


With a bit of care a distributor can be setup to work very well for sure... carbs as well. Simple, reliable, inexpensive....that combination is hard to beat. All I was saying is that at idle its nice to add timing as vacuum drops (throttle opening) to take you from say 10-15 degrees where it cranks and idles nice to the say 20 where it makes peak power at idle rpm father than wait for the mechanical advance to add the timing a few hundred rpm later. That is literally the only thing I think an electronic system can do that a standard distributor can't...but go a little high on cranking/idle timing and it can be pretty hard to tell the difference...certainly not an "Oh my God, how did I live without this!" item and do notice when I was screwing around with my engine I'd gone to a fixed idle timing just like a distributor would have because sometimes simpler is better. I am in no way saying they are bad.

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