OEM tach, what happens if I spin past redline? - page 1 - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• OEM tach, what happens if I spin past redline? by subsonic on 08 Jan, 2008 06:37
• If I install a OEM tach and run my engine into the 6k range, what will happen to the tach?  Will the needle just keep moving, or will it peg out and cause damage to the tach?
• #1 by carrizog60 on 08 Jan, 2008 06:39
• i guess that it will just keep moving...
  i have seen many vw and other brands rev way past redline and it still works...
• #2 by Baselyne on 08 Jan, 2008 08:13
• Not that anyone wants to hear about hondas but a freind of mine used to have a turbo'd Delsol and when he got his MSD 6AL ignition box he used to run the stock tach two or three thousand rpm past redline
  
  I couldnt see any problem there provided there isnt a visable peg to stop the needle
  
  How are you running a diesel over 6G anyways?
• #3 by subsonic on 08 Jan, 2008 09:23
• I have been gathering parts for about a year now for my build.  I think with what I have I should be able to get up there.
  
  1.6TD hydro block-2nd over
  New Kolbenschmidt pistons (getting ceramic coated)
  New 1.9AAZ head with PP stage 2 porting
  3 hole gasket
  ATP turbo exhaust manifold matched to head
  Stock 1.9 intake matched to head( will go with a PP intake if I can swing it)
  Rebuilt Merc turbo with the 360 bearing upgrade and the stepped gap ring
  Giles 9mm pump build for 2x fuel with no rpm cut off.
  Rebuilt AAZ injectors with new Merc 300TD nozzles.
  PP 3" DP as soon as I get my stuff up to Dave for the fab work.
  ARP head studs, main studs, connecting rod bolts.
  New bearings through out.
  New 350hp rated precision intercooler( same as on Daves BW prodject)
  new 36mm oil pump.
  new water pump
  etc, etc.....still need more parts, but getting there
• #4 by 935racer on 08 Jan, 2008 09:44
• Some of them you can wrap around, some stop pretty quick after redline, not sure which models though, likely between ce1 and ce2. Mine in my jetta seams to stop right after redline, this weekend I might get around to installing the autometer one with a dakota digital box.
• #5 by jtanguay on 08 Jan, 2008 10:29
• no rpm cutoff???  :shock:  crazy
• #6 by subsonic on 08 Jan, 2008 15:43
• I have a line on a good oem unit for cheap.  I was just wondering if the tach would start to go to *** if you pushed it past its stops more than a couple times.   I had a old speedo in a diff car that only went to 85mph.  Car went faster than 85.  Soon the speedo needle started bouncing and would not hold steady at constant speed.  Thing made noise and pissed me off while I drove.  Dont want to go through that on this one if I can help it.  This is out of a 87 I believe, going into a 85.
• #7 by subsonic on 08 Jan, 2008 15:44
• Quote from: "jtanguay"

  no rpm cutoff???  :shock:  crazy

  
  
  Thats what the man said.  I still have it all wrapped up sitting on the shelf.
• #8 by flapjack on 08 Jan, 2008 18:52
• 
• #9 by subsonic on 08 Jan, 2008 19:41
• Quote from: "flapjack"

  

  
  
  "One hundred twenty one Jigawatts!!!"
  
  That was just classic Flapjack. :lol:  :lol:   *** like that is why I love this site.
• #10 by RabbitJockey on 08 Jan, 2008 20:39
• my modded cabriolet tach revs to 6, i assume it could go to 7 which i think is where it stops. i only know cause i down shifted on accident or something i forget what happened
• #11 by Mark(The Miser)UK on 09 Jan, 2008 11:46
• Remember the needle is not physically attached in the speedo. In the tach it a pulse count. Thus neither will be 'hurt' :roll:
• #12 by malone on 09 Jan, 2008 15:11
• Quote from: "flapjack"

  

  
  
  :lol: nice chop. That tachometer picture is from 935racer's red MK2 Jetta when it had a stock 1.6TD and a slightly removed RPM governor. I don't recall if the needle can physically swing further than that.
• #13 by subsonic on 09 Jan, 2008 16:37
• This is a vid from the french section.  The tach looks like it goes up to 7 grand?  Is it a gasser converted to the w signal?
  
  http://www.dailymotion.com/group/26519/video/x2im2l_golf-mk1-16-td-portugal_auto
• #14 by foxracer1 on 09 Jan, 2008 17:47
• Quote from: "subsonic"

  This is a vid from the french section.  The tach looks like it goes up to 7 grand?  Is it a gasser converted to the w signal?
  
  http://www.dailymotion.com/group/26519/video/x2im2l_golf-mk1-16-td-portugal_auto

  
  
  That doesn't sound like 5K. My car sounds like its gonna come apart and according to my calculations i'm only turnin 4100rpm @ 60mph in third