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Tuning spark maps


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Just discussing the best way to tune the lower load tables for spark advance? 

 

For my case, haedjr5, fg turbo on E85, I understand that E85 allows the spark to advance towards MBT without knock, but with our ecu not being adjustable in real time, tuning via torque optimisation is difficult, what is the best practice to tune the lower load on E85?

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Work your way towards the stock mbt table in small increments with knock control turned off and knock ears on. Make sure you aren't getting into the iat and coolant modifier regions as that will start pulling timing. 

Once you are happy heatsoak the car on a hot day and ensure no knock. Then turn knock control back on. Depending on how noisy your motor is you may get phantom knock and need to desensitise the system. 

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Is there a recommended way to log injector duty cycle (bsfc) to get the cruise timing in the ballpark on the road?

Currently using an SCT X4 to log, I haven't managed to find a reliable way to do it yet. Suggestions would be welcome! Got the knock-limited spark pretty right with knock ears, but the MBT non knock-limited stuff is proving harder.

How do dyno tuners do it with the reflash-style ECUs? Just do a few pulls at specific loads and speeds, change something then try again - While logging torque output on each run?

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Thanks @finnigan001 - Have had a look at that one, that would be massively tedious on one of our ECUs though? To reflash and run it up on the dyno every time a timing change is needed?

 

The reason I'm after some sort of logging of BSFC (brake specific fuel consumption) is to get the MBT table mapped properly for cruise / part throttle timing.

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4 minutes ago, richardpalinkas said:

Is it possible with further development to allow the standard ecu to flash in real time? Or is that just not possible at all?

We would have to charge about 1k in credits per vehicle to make a business case for it. The reality is the end user doesn't see the benefits only the tuner, so it is a hard sell for the large amount of development time required.

There are development PCMs that Ford use available from Visteon etc that cost about $10k, then the hardware and software licenses to actually tune them would be close to 100k. One of the tuners in VIC bought an ex development car from auction that had one in it, so they do exist.

HPTuners did real time tuning for a GM platform early on and they said the R&D/Support for it absolutely overwhelmed every other aspect of the business which is why they did not do it again for any other vehicles.

Short answer, yes it is possible, but unlikely to be a good move business wise.

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