TPI conversion speed density do i need VSS?
Thread Starter
Instructor
Joined: Apr 2012
Posts: 179
Likes: 3
TPI conversion speed density do i need VSS?
i am about to do a f.i.r.s.t tpi conversion on my 81 and am wondering do i need a vehicle speed sensor? they didn't send one and frankly i am not even sure how or where that would go, will the ecu function fine without it?
Burning Brakes
Joined: Sep 2006
Posts: 1,071
Likes: 86
From: Rotonda FL
Please note that early TPI VSS is 2000 pulse while later is 4000 pulse.
If you need help, PM me. I am running TPI with a 700R4 and VSS. It is not difficult to do.
Last edited by Rotonda; May 24, 2016 at 07:33 AM. Reason: addition
Thread Starter
Instructor
Joined: Apr 2012
Posts: 179
Likes: 3
Thread Starter
Instructor
Joined: Apr 2012
Posts: 179
Likes: 3
There are no instructions in the efi manual and no hardware for this, just a couple of wires with no connector that are marked speed sensor
Thread Starter
Instructor
Joined: Apr 2012
Posts: 179
Likes: 3
I received and ecu from affordable fuel injection with a chip that is supposedly set for my configuration, with 330k on the motor i will be rebuilding in the future and will probably hit the dyno then for optimized chip.
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
The typical 1227730 GM computer will send the engine into an idle hunt mode with the idle drifting around 1000 rpm without a VSS signal, you need spend some bux and go on ebay and find a 4000 ppm sender that will screw into the trans, then the cable screw into it.....and of course hook up the wires, mine were purple and yellow....
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Le Mans Master
Joined: Jan 2001
Posts: 6,713
Likes: 1,372
Here is the VSS I used when i had a 730 ECM
The tach cable adapter attached to the tranny, then the VSS installed, then the regular cable went to the speedometer.
Worked just super.
Part numbers below are about 10-12 years old, but perhaps they can cross-reference for you if you contact suppliers.
I'd look around some, because the price on that VSS has doubled since I bought it. Seems a bit much but there it is.
Not sure MA has that tach cable adapter(can't find it?) on their mamotorworks site. If you look for "tach cable extension" on the net you should be able to find a short cable instead.
Painless VSS from Summit, PRF-60116.
Tach Cable adapter from Mid America Corvette for VSS.
609465
But REALLY need to know your ECM number --
Worked just super.
Part numbers below are about 10-12 years old, but perhaps they can cross-reference for you if you contact suppliers.
I'd look around some, because the price on that VSS has doubled since I bought it. Seems a bit much but there it is.
Not sure MA has that tach cable adapter(can't find it?) on their mamotorworks site. If you look for "tach cable extension" on the net you should be able to find a short cable instead.
Painless VSS from Summit, PRF-60116.
Tach Cable adapter from Mid America Corvette for VSS.
609465
But REALLY need to know your ECM number --
Last edited by carriljc; May 25, 2016 at 11:23 AM. Reason: add parts comment
Thread Starter
Instructor
Joined: Apr 2012
Posts: 179
Likes: 3
The tach cable adapter attached to the tranny, then the VSS installed, then the regular cable went to the speedometer.
Worked just super.
Part numbers below are about 10-12 years old, but perhaps they can cross-reference for you if you contact suppliers.
I'd look around some, because the price on that VSS has doubled since I bought it. Seems a bit much but there it is.
Not sure MA has that tach cable adapter(can't find it?) on their mamotorworks site. If you look for "tach cable extension" on the net you should be able to find a short cable instead.
Painless VSS from Summit, PRF-60116.
Tach Cable adapter from Mid America Corvette for VSS.
609465
But REALLY need to know your ECM number --
Worked just super.
Part numbers below are about 10-12 years old, but perhaps they can cross-reference for you if you contact suppliers.
I'd look around some, because the price on that VSS has doubled since I bought it. Seems a bit much but there it is.
Not sure MA has that tach cable adapter(can't find it?) on their mamotorworks site. If you look for "tach cable extension" on the net you should be able to find a short cable instead.
Painless VSS from Summit, PRF-60116.
Tach Cable adapter from Mid America Corvette for VSS.
609465
But REALLY need to know your ECM number --
Le Mans Master
Joined: Jan 2001
Posts: 6,713
Likes: 1,372
here is a pic of the VSS I used--
for my old 730 ECM....
easy enough to use short cable from tranny to vss, insert vss, then the regular speedo cable goes off to the speedometer.
Since you already have the chip burned and the ECM, then I understand what you are doing. Otherwise, I would recommend a newer self-learning system.
easy enough to use short cable from tranny to vss, insert vss, then the regular speedo cable goes off to the speedometer.
Since you already have the chip burned and the ECM, then I understand what you are doing. Otherwise, I would recommend a newer self-learning system.
Last edited by carriljc; May 26, 2016 at 09:18 AM. Reason: added type of ECM being used