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908/930's Avatar
 
Join Date: May 2012
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Gasoline direct injection

With all the high HP 930's out there has anyone looked into going with direct cylinder injection in the future?
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Old 06-27-2018, 01:47 PM
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Chain fence eating turbo
 
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Yes, just light research. Itíd be cool to run 10:1 CR and 30 lbs of boost on 93 octane with lean AFRís.

Thereís aftermarket EFI systems out there that will control the injectors, but the cost of injectors and high pressure pump arenít economically possible AFAIK.
Old 06-27-2018, 05:59 PM
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I wouldn't want to deal with cleaning intake valves personally, and the complexity of the system (as Tippy stated above) makes the proposition pretty expensive at the current state of the market. Perhaps in a few years the prices will come down with respect to the aftermarket. Tuning these systems is not for the novice either, as fuel is injected in multiple instances per cycle rather than a single pulse, to propagate the flame front. Injection timing and pump pressure becomes ultra critical and without some serious development tools (cylinder pressure sensors, etc...), creating a calibration from scratch for an engine that was not originally developed to operate as DI would be extremely difficult. Be prepared to spend A LOT of time and money.
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Old 06-28-2018, 04:24 PM
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So, Let's work to develop an intake injection system with high injection pressure and near superior atomization. Wait... The factory did that with MFI.

How about an electronic version of MFI? Nominal 220psi fuel rail. Just need high pressure valves and high voltage drivers to operate the injectors.
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Old 07-02-2018, 10:02 AM
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The one huge thing I really like about DI, is you don't worry about throttle transients as much as port injection, since every molecule of fuel is injected directly into the cylinder.

No wall wetting to deal with.

To me, tuning should be easier than port in this regard. I never could get the algorithm down to account for wall-wetting. Just use the crude AE in MegaSquirt for a 'good enough' approach. Not much better than a carb in that sense.
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Old 07-02-2018, 10:20 AM
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There is a solution and it was very popular in the early days of turbocharging, propane. High octane and no vaporization issues.
Old 07-02-2018, 11:32 AM
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Not sure how MS handles AE but most others have several tables and throttle response is better than Motronic system equipped cars if it is tuned properly.
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Old 07-05-2018, 10:36 PM
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