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Author Topic: OEM tach, what happens if I spin past redline?  (Read 5681 times)

January 08, 2008, 06:37:13 am

subsonic

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OEM tach, what happens if I spin past redline?
« on: January 08, 2008, 06:37:13 am »
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?
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2009 Jetta TDI Loyal edition, 6-spd. 16V 2.0CR


1985 VW Golf 5-spd, 4-door, 1.6NA  Bought from orig. owner in Savannah with 42,000 miles.
"Making the jump NA to TD" slow but sure.

1980 VW Rabbit LS 5-spd, 4-door 1.6NA almost 450,000miles  RIP
Reply #1January 08, 2008, 06:39:06 am

carrizog60

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OEM tach, what happens if I spin past redline?
« Reply #1 on: January 08, 2008, 06:39:06 am »
i guess that it will just keep moving...
i have seen many vw and other brands rev way past redline and it still works...
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Reply #2January 08, 2008, 08:13:48 am

Baselyne

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OEM tach, what happens if I spin past redline?
« Reply #2 on: January 08, 2008, 08:13:48 am »
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?
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Reply #3January 08, 2008, 09:23:52 am

subsonic

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OEM tach, what happens if I spin past redline?
« Reply #3 on: January 08, 2008, 09:23:52 am »
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 :)
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2009 Jetta TDI Loyal edition, 6-spd. 16V 2.0CR


1985 VW Golf 5-spd, 4-door, 1.6NA  Bought from orig. owner in Savannah with 42,000 miles.
"Making the jump NA to TD" slow but sure.

1980 VW Rabbit LS 5-spd, 4-door 1.6NA almost 450,000miles  RIP
Reply #4January 08, 2008, 09:44:53 am

935racer

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OEM tach, what happens if I spin past redline?
« Reply #4 on: January 08, 2008, 09:44:53 am »
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.
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Reply #5January 08, 2008, 10:29:57 am

jtanguay

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OEM tach, what happens if I spin past redline?
« Reply #5 on: January 08, 2008, 10:29:57 am »
no rpm cutoff???  :shock:  crazy
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Reply #6January 08, 2008, 03:43:12 pm

subsonic

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OEM tach, what happens if I spin past redline?
« Reply #6 on: January 08, 2008, 03:43:12 pm »
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.
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2009 Jetta TDI Loyal edition, 6-spd. 16V 2.0CR


1985 VW Golf 5-spd, 4-door, 1.6NA  Bought from orig. owner in Savannah with 42,000 miles.
"Making the jump NA to TD" slow but sure.

1980 VW Rabbit LS 5-spd, 4-door 1.6NA almost 450,000miles  RIP
Reply #7January 08, 2008, 03:44:27 pm

subsonic

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OEM tach, what happens if I spin past redline?
« Reply #7 on: January 08, 2008, 03:44:27 pm »
Quote from: "jtanguay"
no rpm cutoff???  :shock:  crazy


Thats what the man said.  I still have it all wrapped up sitting on the shelf.
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2009 Jetta TDI Loyal edition, 6-spd. 16V 2.0CR


1985 VW Golf 5-spd, 4-door, 1.6NA  Bought from orig. owner in Savannah with 42,000 miles.
"Making the jump NA to TD" slow but sure.

1980 VW Rabbit LS 5-spd, 4-door 1.6NA almost 450,000miles  RIP
Reply #8January 08, 2008, 06:52:37 pm

flapjack

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OEM tach, what happens if I spin past redline?
« Reply #8 on: January 08, 2008, 06:52:37 pm »
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Reply #9January 08, 2008, 07:41:22 pm

subsonic

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OEM tach, what happens if I spin past redline?
« Reply #9 on: January 08, 2008, 07:41:22 pm »
Quote from: "flapjack"


"One hundred twenty one Jigawatts!!!"

That was just classic Flapjack. :lol:  :lol:   *** like that is why I love this site. :D
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2009 Jetta TDI Loyal edition, 6-spd. 16V 2.0CR


1985 VW Golf 5-spd, 4-door, 1.6NA  Bought from orig. owner in Savannah with 42,000 miles.
"Making the jump NA to TD" slow but sure.

1980 VW Rabbit LS 5-spd, 4-door 1.6NA almost 450,000miles  RIP
Reply #10January 08, 2008, 08:39:08 pm

RabbitJockey

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OEM tach, what happens if I spin past redline?
« Reply #10 on: January 08, 2008, 08:39:08 pm »
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
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Reply #11January 09, 2008, 11:46:59 am

Mark(The Miser)UK

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OEM tach, what happens if I spin past redline?
« Reply #11 on: January 09, 2008, 11:46:59 am »
Remember the needle is not physically attached in the speedo. In the tach it a pulse count. Thus neither will be 'hurt' :roll:
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Reply #12January 09, 2008, 03:11:32 pm

malone

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OEM tach, what happens if I spin past redline?
« Reply #12 on: January 09, 2008, 03:11:32 pm »
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.
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Reply #13January 09, 2008, 04:37:17 pm

subsonic

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OEM tach, what happens if I spin past redline?
« Reply #13 on: January 09, 2008, 04:37:17 pm »
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
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2009 Jetta TDI Loyal edition, 6-spd. 16V 2.0CR


1985 VW Golf 5-spd, 4-door, 1.6NA  Bought from orig. owner in Savannah with 42,000 miles.
"Making the jump NA to TD" slow but sure.

1980 VW Rabbit LS 5-spd, 4-door 1.6NA almost 450,000miles  RIP
Reply #14January 09, 2008, 05:47:56 pm

foxracer1

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OEM tach, what happens if I spin past redline?
« Reply #14 on: January 09, 2008, 05:47:56 pm »
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
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