Gen 4 tach signal

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Gen 4 tach signal

Postby 3spowerhouse » Wed Feb 05, 2014 9:02 pm

I'm sure most people know the factory tach doesn't work after doing a gen 4 swap, how have most people rectified this problem? A tach adapter can solve this but has anyone ever used any other alternatives? I've read that a 10k ohm resistor can make it functional again, anyone tried this?
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Re: Gen 4 tach signal

Postby fussellbug » Thu Feb 06, 2014 8:52 pm

The Caldina 3S-GTE probably has the same tach signal as the Beams 3S-GE. Some Beams owners have used a resistor to correct for the difference.
http://www.mr2.com/forums/threads/82165-BEAMS-tach-and-AC?highlight=tach+resistor
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1990 Toyota Celica

Re: Gen 4 tach signal

Postby 3spowerhouse » Fri Feb 07, 2014 12:05 pm

yep, this confirms it Image
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Re: Gen 4 tach signal

Postby pit_celica » Sat Feb 08, 2014 6:12 pm

I built my own tach adapter using a standard bosch coil relay and a transistor as seen in this thread :

http://www.mr2oc.com/showthread.php?t=436425

It worked nicely.

Sam
1991 Toyota Celica GT-S ST184 with 3SGTE gen4 ST215 swap, Megasquirt 3 + MS3X, t3/t4 turbo, 3" full exhaust, front mount intercooler and more for fun !!!!!
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