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Engine Specific Info and Questions => mTDI Mechanical TDI Conversions => Topic started by: Ian0391 on June 27, 2017, 12:52:51 am

Title: Shift light?
Post by: Ian0391 on June 27, 2017, 12:52:51 am

Hey guys,

Long story short, Im building a fairly powerful compound turbo mtdi mated to a manual valve bodied 010 automatic. I do have a working tach, however I'm trying to figure out how to add a shift light so I don't over rev accidentally. My pump has the governor modified so it will continue to increase fuel until well after the motor tears itself apart. Has anyone tried this before?

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Title: Re: Shift light?
Post by: libbydiesel on June 27, 2017, 02:59:16 pm

The motor won't tear itself apart.  The limiting factor on these engines is fuel delivery, not mechanical.  Rev away.  Your fuel economy will be bad and your emissions will be high, but you really won't damage the engine.

Title: Re: Shift light?
Post by: Ian0391 on June 27, 2017, 03:35:04 pm

My pump is heavily modified, on the flow bench in continues to. Increase fuel well past 6500rpm

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Title: Re: Shift light?
Post by: vanbcguy on June 28, 2017, 02:48:52 am

The injection pumps can't really get over 6500 RPM since the rollers start skipping on the camplate around there. The actual engine block, crank and rods will do 6500 without issue. Remember the gasser versions of the same engine series have factory redlines around there and aren't built as stout.

You should be fine...

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Title: Re: Shift light?
Post by: Ian0391 on June 28, 2017, 06:19:26 am

I thought the issue on these was valve float after 5500 since there's so little clearance to the pistons.

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Title: Re: Shift light?
Post by: vanbcguy on June 28, 2017, 10:58:55 am

There's quite a few people on here with juiced up engines hitting 6k+ pretty regularly.

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Title: Re: Shift light?
Post by: libbydiesel on June 29, 2017, 01:24:41 am

You might consider installing an actual rev limiter rather than a shift light.  RPM input into an Arduino and out to n75 valve between intake and LDA would be all that it would take.  Very minimal code, just cut the N75 at the desired rpm. 

Title: Re: Shift light?
Post by: vanbcguy on June 29, 2017, 08:58:38 pm

I have that feature in my VNT controller... ☺️

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Title: Re: Shift light?
Post by: BGA on July 01, 2017, 07:02:09 am

A question to vanbcguy. So yr Arduino/VNT is up and working? How much of it are you/have you made official on internet or preparing to sell hardware and code?

Ian0391, Sorry to hijack your thread.

Title: Re: Shift light?
Post by: vanbcguy on July 02, 2017, 04:03:55 am

Yeah the code is freely available along with the board design etc... Everything I've done is published. If you search "vanbcguy" on github.com you'll find it. I'm not planning on making a commercial product or anything, what you see is what you get.

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