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PostPosted: Sat Aug 18, 2007 1:19 pm 
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Spends Too Much Time Under The Hood

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Location: orlando, fl
The swap was done by 89Mirageman, and I haven't checked the wires. Basically the cars tach works, although inaccurate according to the SAFC, but when you go WOT it starts bouncing and comes completely worthless. I am using the SAFC for a tach which I hate since its digital and cant stand it. I bought an aftermarket tach with shift light but want to fix this so I can return it and get a regular shift light.

Will this link fix my problem? The car has a 94 ecu and engine.

http://www.dsmchips.com/1990ecu.html

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91 Galant VR4


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PostPosted: Mon Aug 20, 2007 8:24 pm 
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Spends Too Much Time Under The Hood

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Location: orlando, fl
yes, no, maybe, go to hell?


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PostPosted: Mon Aug 20, 2007 9:07 pm 
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Did this problem just start or has it been doing it all along? I remember it working fine when I drove it but I was still in the process of tuning it and didn't spend much time at WOT to be honest.

All I did was add a 90 tach filter to the 91+ coil pack and ran the single white wire for the signal.

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89 2 Door Montero V6/Manual
95 Eagle Summit DL coupe
15 Mitsubishi Mirage ES hatch


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PostPosted: Mon Aug 20, 2007 9:24 pm 
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Spends Too Much Time Under The Hood

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Location: orlando, fl
its been doing it since i bought the car, its fine till about 2 grand then it starts to get inaccurate and if you take it over 4k at WOT, it jumped around erratically.

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91 Galant VR4


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PostPosted: Mon Aug 20, 2007 9:31 pm 
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I'm positive it worked when I did the swap, I had the car over 4k quite a few times with no problems at all. I thought you meant when you hold it at 6k + or something which is something I didn't do too much of while driving it untuned. This is kinda weird, wonder if the tach filter can go bad?

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89 2 Door Montero V6/Manual
95 Eagle Summit DL coupe
15 Mitsubishi Mirage ES hatch


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PostPosted: Mon Aug 20, 2007 9:53 pm 
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Spends Too Much Time Under The Hood

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Location: orlando, fl
Maybe, how would I go about getting another tach filler? I really want the stock tach to work cause I hate trying to shift with the SAFC!


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PostPosted: Tue Aug 21, 2007 12:39 am 
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Joined: Sun Jan 22, 2006 9:44 pm
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Location: Perth, Western Australia
Quote:
The swap was done by 89Mirageman, and I haven't checked the wires. Basically the cars tach works, although inaccurate according to the SAFC, but when you go WOT it starts bouncing and comes completely worthless. I am using the SAFC for a tach which I hate since its digital and cant stand it. I bought an aftermarket tach with shift light but want to fix this so I can return it and get a regular shift light.

Will this link fix my problem? The car has a 94 ecu and engine.

http://www.dsmchips.com/1990ecu.html
when i first did my swap, i had that exact issue.

your link you posted fixed my tach once and for all.


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PostPosted: Wed Aug 22, 2007 6:39 am 
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Location: Montreal, Quebec, Canada
The tach Modules on the 1990 style coil pack fails sometimes and it will act like your tach.

Any 1990-1994 Hyundai used the tach adaptor if im not mistaken.
Change it and you will be fine.

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Mirage Turbo 1989 11.323 @ 130.25 mph
Pics and Vids -> http://coltmax.monchar.com <-
Nissan Maxima 2002 3.5 Manual Winter Beater


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PostPosted: Wed Aug 22, 2007 9:54 am 
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Quote:
The tach Modules on the 1990 style coil pack fails sometimes and it will act like your tach.

Any 1990-1994 Hyundai used the tach adaptor if im not mistaken.
Change it and you will be fine.
Exactly, my 94 Elantra uses 90 style DSM electronics for some reason. Except for the throttle body.

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89 2 Door Montero V6/Manual
95 Eagle Summit DL coupe
15 Mitsubishi Mirage ES hatch


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PostPosted: Wed Aug 22, 2007 11:59 am 
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Spends Too Much Time Under The Hood

Joined: Fri Aug 18, 2006 1:18 pm
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Location: orlando, fl
Quote:
The tach Modules on the 1990 style coil pack fails sometimes and it will act like your tach.

Any 1990-1994 Hyundai used the tach adaptor if im not mistaken.
Change it and you will be fine.
so get a new tach filler or coil pack? sorry im retarded... im trying to do what the link told me (splice a wire going from the pin 109 on the ecu to the white wire) and see if that fixes it first.

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91 Galant VR4


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PostPosted: Wed Aug 22, 2007 1:18 pm 
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Location: Montreal, Quebec, Canada
What year is your ECU?
What year is you Coilpack?

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Mirage Turbo 1989 11.323 @ 130.25 mph
Pics and Vids -> http://coltmax.monchar.com <-
Nissan Maxima 2002 3.5 Manual Winter Beater


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PostPosted: Wed Aug 22, 2007 2:01 pm 
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Location: Stantonsburg, NC
Mark, I tied the filter into the white wire going to the power transistor. This wire does go to pin 109 according to the wiring manual. No need to run a separate wire.

It is a 94 coil, ecu and wiring harness with a 90 DSM tach filter spliced in.

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89 2 Door Montero V6/Manual
95 Eagle Summit DL coupe
15 Mitsubishi Mirage ES hatch


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PostPosted: Wed Aug 22, 2007 2:39 pm 
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Spends Too Much Time Under The Hood

Joined: Fri Aug 18, 2006 1:18 pm
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Location: orlando, fl
OK so i need to replace the tach filler, these come on 90 dsm's and 90-94 hyndai elantra's correct?


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PostPosted: Wed Aug 22, 2007 6:51 pm 
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Location: Perth, Western Australia
hope i get my DSM year conversions right :lol:

first off i used a 90 coil pack and tach filter, 94 ecu, wired normally and my tach did the werido.

then i switched to the 94 power transistor, running that to the ecu, i then ran the tach filter directly to the dash.

basically pin 109 on the ecu splits in two, one from the tach filter and one to the dash, so i just pulled the pin out, trimmed it up and thats my dash feed. i ran a new wire to pin 109 from the power transistor unit (actually used my FPR solenoid wiring as im not using it).

you guys do know that the 94 ecu needs the 94 power transistor units tach signal, its 180 deg out of phase compared to the 90's tach filter. there was some talk about the out of phase signal from the a tach filter causing some phantom knock issues.

also, if your running 94 coil packs, how did you convert from the 4 plug to the 3 plug coil pack connector?


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PostPosted: Wed Aug 22, 2007 8:31 pm 
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Location: Stantonsburg, NC
Quote:

also, if your running 94 coil packs, how did you convert from the 4 plug to the 3 plug coil pack connector?
I can't remember if it had 3 or 4 wires on the plug but the harness and the coil pack were both from a 94 so no need to convert the plug.

_________________
89 2 Door Montero V6/Manual
95 Eagle Summit DL coupe
15 Mitsubishi Mirage ES hatch


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