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Author Topic: Shift light?  (Read 3050 times)

June 27, 2017, 12:52:51 am

Ian0391

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Shift light?
« 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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Reply #1June 27, 2017, 02:59:16 pm

libbydiesel

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Re: Shift light?
« Reply #1 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.

Reply #2June 27, 2017, 03:35:04 pm

Ian0391

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Re: Shift light?
« Reply #2 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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Reply #3June 28, 2017, 02:48:52 am

vanbcguy

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Re: Shift light?
« Reply #3 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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Bryn

1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen

Reply #4June 28, 2017, 06:19:26 am

Ian0391

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Re: Shift light?
« Reply #4 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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Reply #5June 28, 2017, 10:58:55 am

vanbcguy

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Re: Shift light?
« Reply #5 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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Bryn

1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen

Reply #6June 29, 2017, 01:24:41 am

libbydiesel

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Re: Shift light?
« Reply #6 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. 

Reply #7June 29, 2017, 08:58:38 pm

vanbcguy

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Re: Shift light?
« Reply #7 on: June 29, 2017, 08:58:38 pm »
I have that feature in my VNT controller... ☺️

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Bryn

1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen

Reply #8July 01, 2017, 07:02:09 am

BGA

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Re: Shift light?
« Reply #8 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.
Bo Gunnar

Reply #9July 02, 2017, 04:03:55 am

vanbcguy

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Re: Shift light?
« Reply #9 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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Bryn

1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen