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Old January 13th, 2011, 16:55   #1
Mark@MaloneTuning
 
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Default Dynamic Idle for TDIs

We have seen European industrial TDI engines with a fixed 1250 RPM idle and some of our clients are curious about elevated idle to possibly shorten the warm-up period. They however don't want to consume more fuel with high idle on all the time, especially if the engine is already warmed up. Enter our dynamic idle tune:



The idle also will return to stock if ~12 minutes has been reached, regardless of coolant temperature.

If the car starts up with the coolant temperature already at 60C+ (140F+), the idle RPM will immediately be stock.

Some other idle examples:
  • Cornell University Serial Hybrid 1.4L TDI vehicle - Starts at 1000 RPM and then idles permanently at 1500 RPM once warmed up. This is the optimal RPM range for charging batteries. The 1000 RPM start-up avoids the cold engine wear-and-tear that could occur with a sudden 1500 RPM start. A similar configuration was used in a TDI-powered drilling machine in Alaska.
  • 1100 RPM fixed idle in a highly modified TDI with stiffer engine mounts. This reduces idle vibration. 1200 RPM elevated idle was also applied at lower coolant temp to potentially warm up the engine faster.


This feature has been in use for a year with no issues. It requires custom tuning price (about $50-100 more than standard). Other features are available with custom tuning - dynamic EGR control, left-foot brake fix, and glow plug duration & strength change.
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Old January 13th, 2011, 17:01   #2
Farfromovin
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Also a good idea for those with super stiff dogbone mounts!!! I like the innovation here Mark. More options are always great.
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Old January 13th, 2011, 17:39   #3
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Very nice. Can you reduce the rediclously long afterglow that these cars have too?

It would be neat if there was a complete list of these modifications you are able to do.
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Old January 13th, 2011, 21:52   #4
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Quote:
Originally Posted by turbocharged798 View Post
It would be neat if there was a complete list of these modifications you are able to do.
^ Agreed to this! Kinda like a buffet, or smorgasbord of tuning choices!!

As Phillip said, nice work on the innovation!

Cheers,
-Chris
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Old January 13th, 2011, 22:05   #5
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I can attest that high idle helps with stronger mounts. It also helps with smooooth launches.
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Old January 14th, 2011, 02:19   #6
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i have 1050rpm idle, it makes the stiffer mounts bearable! Launching is also improved as stated before!
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Old January 16th, 2011, 10:44   #7
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i have had a 1200RPM idle (see sig) since putting in my hybrid vnt20 and it works amazing not only for warmups but for a lightened flywheel (had 14lbs FW)..made the flywheel feel more like a stock 22lbs FW. Malone did it for me when he was with kerma. the only thing though, mine starts up at the normal 900rpm but after 10 minutes, it climbs and stays at 1200rpm. and only because i was told they couldnt figure out how to startup and stay at 1200rpm on the bew's. that was 3 yrs ago...i guess its been figured out.
good job.
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Old January 16th, 2011, 10:49   #8
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Quote:
Originally Posted by Malone Tuning View Post


The idle also will return to stock if ~12 minutes has been reached, regardless of coolant temperature.
This time based drop is a neat feature. Is this only to be found with an appropriate damos. Or have you written completely new code?
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Old January 16th, 2011, 21:22   #9
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I had Malone do this to my AHU warms up faster i love it!

One thing i've noticed it would be nice if it would idle at stock (9xx) when you first fire it for a few seconds till the engine catches its self, then raise to 1200 for the time. It seems to struggle with the extra fuel when it first lights with the elavated RPM cold start.
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Old January 17th, 2011, 07:07   #10
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I also had Mark do this to my AHH Passat, this thing starts like a bomb and is so smooth. With the elevated idle I can drive around at 20mph in 3rd without touching the go pedal

I have been very happy with my tune and tweaks to it.

Jon
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Old January 17th, 2011, 07:29   #11
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My preference would be a switch on the dash. Switch on, hi idle. Switch off, normal idle.
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Old January 17th, 2011, 13:26   #12
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A switch would be nice.

I had talked with him about a "valet" switch. To derate power and boost for certain drivers. He said he's been looking into it. My tdi swapped 86 will get it.
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Old January 17th, 2011, 14:02   #13
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I don't really think a switch would be necessary, It would probably hit 140F pretty quick in warm weather. I'll have to weigh in when summer comes.

Jon
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Old January 17th, 2011, 18:28   #14
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It would be nice to idle it up after a hard run to help cool down and such.
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Old January 17th, 2011, 18:41   #15
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Been giving this some thought as well... unfortunately *after* I got my tunes from Mark.

I'll probably just do it electronically by adding a small variable resistance on a switch to the go-pedal circuit. It is just a pot itself after all.
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