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    Thread: DIY: Clamping the Map Sensor aka "Diode Mod"

    1. Member 1.8TWolfsberg's Avatar
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      07-09-2004 12:43 AM #1
      Alright, such a nice mod and no write-ups anywhere...at least that I could find!

      So with the help of John (Spooled_AWP) I went ahead and did a few diagrams and then finally did the mod myself!

      Here is the link to my DIY page

      And here are a few diagrams:

      Here is the page to my VW Links page which has a few other DIYs that I have done - http://www.anthonydanna.com/vw.html


      Modified by 1.8TWolfsberg at 1:43 PM 11-25-2008


    2. 07-09-2004 12:46 AM #2

    3. 07-09-2004 01:09 AM #3
      on your install page it says that a 4.7v diode = 17psi. if im not mistaken 17 psi will cause limp right. then how come when i dioded my car (unchipped) at 4.7 v i didnt limp? held a 19 all day long.

    4. 07-09-2004 01:16 AM #4
      thats weird because on my car the 4.7 does nothing in stock mode...still only spike to 10 and hold 8 or so

      maybe you are thinking of the 4.3?
      when im in stock mode with the 4.3 i spike at 19-20!


    5. 07-09-2004 05:12 AM #5
      Thanks 1.8TWolfsberg and Spooled_AWP. I'm sure there are A LOT of people who will appreciate the work you guys did to make this excellent write-up. And with all the talk of diodes, I'm sure people still had a lot of questions unanswered. This SHOULD (hopefully) clear things up now. Thanks again guys.

    6. Member SHUMopper's Avatar
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      07-09-2004 07:11 AM #6
      very nice....
      definetly gonna do this, but with a smaller Voltage diode, like 4.27.

      Props to u for an AWESOME DIY!!!


    7. 07-09-2004 07:56 AM #7
      nice writeup
      never thought of using it as a on/off switch for chipped mode.
      Possible to emulate the valet mode using this method to prevent car from being driven hard?


      Modified by dknl at 4:59 AM 7-9-2004

    8. 07-09-2004 09:24 AM #8
      Is it safe to do this to a stock Gti?

      I only have a K&N cone, And will i feel some huge difference?


      Modified by Maggi at 2:36 PM 7-9-2004


    9. 07-09-2004 09:33 AM #9

    10. Member UmbroVR6's Avatar
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      07-09-2004 09:58 AM #10
      nice writeup, very detailed.

      i know a few peeps who still don't know how to do the diode mod

      i'll forward this info. to them.

      LEASE THIS SPACE

    11. 07-09-2004 11:19 AM #11
      you need to add those negative lines that are on the diodes since they are sensitive as to which way they must be installed

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      07-09-2004 11:32 AM #12
      Get some proper Software instead of using a Diode you bunch a cheapskates!

    13. 07-09-2004 11:40 AM #13
      Quote, originally posted by exS4 »
      Get some proper Software instead of using a Diode you bunch a cheapskates!

      While a good idea what’s the difference between software like Revo BT that removes overboost limp and using a diode to do the same thing?

      End the end you accomplish the same thing. While Revo BT is great stuff (I would run it if I could) you guys need to admit the very thing that makes it better is the removal of most safety related triggers in the software.

      Revo is better because it allows you to exceed parameters that most tuners consider dangerous. Come on admit it!!!


    14. 07-09-2004 12:38 PM #14
      Quote, originally posted by MRP2001GTi »

      While a good idea what’s the difference between software like Revo BT that removes overboost limp and using a diode to do the same thing?

      End the end you accomplish the same thing. While Revo BT is great stuff (I would run it if I could) you guys need to admit the very thing that makes it better is the removal of most safety related triggers in the software.

      Revo is better because it allows you to exceed parameters that most tuners consider dangerous. Come on admit it!!!

      the revo BT bothers me b/c of that, its just a boost program, when are ythey going to do up the timing?


    15. 07-09-2004 12:47 PM #15
      Quote, originally posted by hugemikeyd »
      you need to add those negative lines that are on the diodes since they are sensitive as to which way they must be installed

      very good point...
      although it does say, if the car cranks but does not start, you have the diode in the wrong way, take it out and turn it around.
      anyone know which wire the negative end of the diode should be connected to? i guess i could go look on my car but im to lazy

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      07-09-2004 01:12 PM #16
      Quote, originally posted by MRP2001GTi »

      Revo is better because it allows you to exceed parameters that most tuners consider dangerous. Come on admit it!!!

      welll to my understanding, out of the box the revo BT is to be set at high boost 9... meaning you can't really excess any boost parameters (or load tables)... and the maf reading is goofed, so people run unplugged... once again, not metering air, and not raising parameters... so i'm wondering what the true benefit is? ... just a more solid idle on the 440s?


    17. 07-09-2004 01:13 PM #17
      Quote, originally posted by Fshowcars »

      welll to my understanding, out of the box the revo BT is to be set at high boost 9... meaning you can't really excess any boost parameters (or load tables)... and the maf reading is goofed, so people run unplugged... once again, not metering air, and not raising parameters... so i'm wondering what the true benefit is? ... just a more solid idle on the 440s?

      so how does a REVO BT car compare to a REVO car with a diode?


    18. Member 1.8TWolfsberg's Avatar
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      07-09-2004 02:45 PM #18
      Quote, originally posted by Spooled_AWP »

      very good point...
      although it does say, if the car cranks but does not start, you have the diode in the wrong way, take it out and turn it around.
      anyone know which wire the negative end of the diode should be connected to? i guess i could go look on my car but im to lazy


      the striped side of the diode should be closest to the map sensor wire side...I have that mentioned in the DIY....almost last step...testing part!

      Com on JOhn.....get with it


    19. 07-09-2004 03:01 PM #19
      Quote, originally posted by 1.8TWolfsberg »


      the striped side of the diode should be closest to the map sensor wire side...I have that mentioned in the DIY....almost last step...testing part!

      Com on JOhn.....get with it

      then i would just update your pic, i mean people don't read as often as they look at a pic...


    20. 07-09-2004 03:41 PM #20
      Quote, originally posted by 1.8TWolfsberg »


      the striped side of the diode should be closest to the map sensor wire side...I have that mentioned in the DIY....almost last step...testing part!

      Com on JOhn.....get with it


      haha...that could also be a little confusing....maybe state which color wire the striped side should be connected to!

    21. Member 1.8TWolfsberg's Avatar
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      07-09-2004 04:39 PM #21
      whats confusing about it

      striped side to map sensor side and non-striped side to switch side...easy as cake


    22. 07-10-2004 12:58 PM #22
      Very Nice writte up!!

    23. Member 1.8TWolfsberg's Avatar
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      07-10-2004 02:34 PM #23
      thanks man...glad it is helping people out

    24. 07-10-2004 04:05 PM #24
      Is this a good "mod" on a stock Golf Gti? Only thing i have is a K&N cone.

      Has this mod been Dyno´d?


    25. Member 1.8tizzle's Avatar
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      07-10-2004 04:29 PM #25
      to you guys on a nice write up.

    26. 07-11-2004 03:12 PM #26
      Quote, originally posted by Maggi »
      Is this a good "mod" on a stock Golf Gti? Only thing i have is a K&N cone.

      Has this mod been Dyno´d?

      Anyone know ?


    27. 07-11-2004 04:26 PM #27
      Quote, originally posted by Maggi »

      Anyone know ?

      YES look at the post right above yours--------Tizzle made 203WHP stock ecu 4.3 diode


    28. 07-11-2004 06:57 PM #28
      Quote, originally posted by Maggi »
      Is this a good "mod" on a stock Golf Gti? Only thing i have is a K&N cone.

      Has this mod been Dyno´d?

      it's not the best way to go about things, but it works. You have obd2 so the 1st o2 sensor/MAF bumps up the fuel out output. with a chip timing and fuel curves are going to be smoother. i'd get a MBC so you can manually tweek a lil bit more. Put in a heat ranger cooler plug run 93 octane and it will get you by until you get a chip. as stated you can get 200 wheel with a diode(ko3sport)


      Modified by RABIDRABBIT1983 at 11:59 PM 7-11-2004


    29. 07-15-2004 01:06 AM #29
      well before doideing a car you need to understand the difference in voltages verses boost levels verses voltage of limp. you want to clamp as high as you can boost wise before limp. this will make for better fueling.

    30. 07-18-2004 05:15 PM #30
      finally a writeup!

    31. Member JettAffair's Avatar
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      07-18-2004 08:38 PM #31
      new to the diode idea here. It looks like when you want to go with 1 diode/no switch, you simply put a diode between the purple/gray and the orange/blue. Is it that simple? and do I have to solder?
      2012 Golf R BMP 4dr loaded | Revo Stage 1

    32. Member 1.8TWolfsberg's Avatar
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      07-18-2004 08:55 PM #32
      unless your 100% confident you can securley attach the diode to the wires, then I would solder them together

    33. 07-18-2004 09:11 PM #33
      I have an apr chip 93 now my question is do I need one 4.3 and one 4.7, or can I use one 4.7.

    34. 07-19-2004 12:45 AM #34
      a
      better make it
      for the write up

    35. 07-19-2004 03:13 AM #35
      where is this map sensor??

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