slowss02

iTrader: (10)

thats a good question, i have that problem right now.. i have the speedo hooked up to the front wheel, and when i do a burnout, my check engine light comes on..i scan it and its for vss.. did anyone have that problem and whats the solution besides hooking it up to the rear wheel sensor? the rear end i got doesnt have abs sensor in it,, so any other ideas?

jmill96Z

iTrader: (3)

Disable the VSS DTC in the PCM. I have mine the same way, and never pop a code.

slowss02

iTrader: (10)

do you remember what code number is it ?

flippincamaro

iTrader: (23)

Very cool writeup

rcsfastmonte

iTrader: (1)

I have been told a 90 gmc truck 3/4 ton with a 400 turbo pig tail will also work,anyone know where I can get one?I have a 400 turbo in my 05 gto and need to find a way to make speedo work!

Loudmouth LS1

iTrader: (10)

Ok, I wired this up finally to get my speedo back, only thing i'm having an issue with is the tuning part. It says to put in 2.76 for rear gear ratio if the car was originally a 6-speed, which I did, but then it says put in your front tire size for tire size. Nowhere in EFILive do I see an option for tire size, I have VSS pulses per mile to control the speedo instead, so what would I put in that box? And do I still leave the VSS pulses per revolution at 17 (i'm assuming that's what the 2.76 gear change is used for, to make up for the difference between the amount of teeth on the tranny to the abs sensor, so the 17 should stay the same i'm assuming, correct)?

Here's a screen shot of my software:



I put rear diff ratio of 2.76 in H0103 and then did the calculation it says on the screen to get H0101 using the front tire size and diff ratio of 2.76 and the vss pulses per revolution of 17 and came up with the 37272 number that I have in H0101, is that correct? Does anything else need to be changed? Thanks for any help, it will be nice to have a speedo again after 4 - 5 years of not having one!

Loudmouth LS1

iTrader: (10)

Ok, nevermind, i'm retarded, just found the speedo calculator button, all done, hopefully works right!

1961ba427

iTrader: (26)

This thread is AWESOME!!!!! I like the idea of using a 2nd sensor to read off a rear reluctor on a 4 channel car and have a working speedo AND keep ABS. Surprised it wasn't mentioned more. Thanks for posting all this.

thegroup

iTrader: (1)

helping bring an oldy back again. with a all drag car, u just need the PCM to see the car is moving, correct? and dont have to have all the independ math and numbers. really dnt care if the speedo is right on or even works or have ABS since i already cut the wheels off the axles. ill find out how fast i was going at the time gate. ive just been reading that when swaping from a A4 to a th350/th400(now in my car) u have to get a way to get the PCM to see the car is moving. ANY INFO PLEASE!?!?!?!!

Busy Mopper

iTrader: (4)

not cool if u cant use ur abs

baker7902

iTrader: (5)

very nice thread glad its a sticky now lol i will be installing a th400 in my camaro as soon as i get home from afganistan

Duffster

iTrader: (103)

Tomorrow I'm tying in the speedo pigtail to the drivers rear abs pigtail. . .

Since I've changed my rear gears to 4.30 (M6 use-to-be) should I use a different number than 2.76 or just go with it?

I'm sure I'll figure it out when I am driving 3rd gear expecting to see 56mph and seeing 45 or 70...

I'll take pictures too and post results!

Duffster

iTrader: (103)

So the drivers side abs sensor connection looks like:



It unplugs from the bulkhead terminal right behind it here and is (at least on my car) this one...:



I decided to get fancy with the wire and twisted it together with my drill to keep it semi-managable...:



My first zip-tie connection was to the torque arm since relative to the rear end, won't move so it's a stable location in general. The torque arm (provided you have one) provides several places to connect up to:





Once routed, connect up the the black connector with the blue seal that has green and purple wires. This wire/connection is supposed to mount up to the VSS on your transmission.

Without editing the PCM, I gave it a quick spin around the block and it appears that the 2.76 adjustment for the gears will correct my minor speedo issue.



Thanks!!!

D

Duffster

iTrader: (103)

BTW, when I did the change for the rear gears, it had no effect so I changed the VSS from like 47000 something pulses a mile based on the speed HP Tuners indicated and the conversion to actual speed. I used the site below for figuring RPM->Speed... I ended up going something like 34041 or so. The worst part of all this is switching back and forth on my Mac to Windows to use HP Tuners... Surfing on the Mac in Windows mode sucks too!!!

Good luck to all!!!

TWS

iTrader: (63)

Has anyone connected into the front ABS sensor and wired it up such that the ABS sensor in the front wheel hub is feeding a signal to BOTH the VSS lead and the EBCM? (electronic brake control module)

Does it work?

This is on a 2000 Camaro SS that came M6 from the factory and now runs a TH400. I have prepped the car by running the OEM T-56 harness back up into the engine bay and running the wire with the VSS connector in the exact path the stock ABS wiring took. I did this by unbolting the heat shield on the drivers side next to my headers and running the stock wiring behind there where the ABS wire was and down and out into the front wheel well, then bolting the heat shield back up. I now have the VSS connector sitting right where the factory ABS wire snaps into the piece that runs along the lower A-arm and into the sensor in the front wheel hub. I am having the missing length (from factory VSS plug to ABS sensor in wheel hub) made with weather pack connectors so it will be plug and play with no cutting of the harness. However, I realized having the ABS wiring disconnected causes the annoying "BRAKE" light to be on in the dash. Therefore I want to make the jumper wire have two connectors at the wheel hub end. One to feed signal to the VSS plug so my speedo works and one to continue to send a signal to the EBCM to avoid the annoying "BRAKE" light. If I don't, I'll be constantly checking my parking brake handle.

Anyway, I wanted to see if having it plugged into both doesn't disrupt the signal somehow... so that I get a good useable signal for the speedo and also keep the "BRAKE" light off.

Thanks!

FTICONVERTERS

iTrader: (3)

Just sayin!!

I have the reluctor wheels, both 40 tooth and the 17 tooth in stock as well as the wiring adaptors and the speed sensors for the TH400

Greg

TWS

iTrader: (63)

Update:

Doesn't seem like too many peeps are interested, but FWIW I fixed the speedo issue.

I had Auto Wiring Solutions make me a jumper with three connectors on it. (I don't like cutting a factory harness if I can avoid it). On one end it plugs into the connector coming from the WSS on the front driver side wheel and then has two connectors on the other end. One plugs into the connector leading to the EBCM (to keep the "BRAKE" fault light off) and the other plugs into the VSS lead that would normally plug into the side of the T-56. I hooked it up and secured the wires last night and it works! The signal for my speedo is now coming off the front WSS - I already had my tuner enter the necessary data into the PCM. I have only driven the car a few miles but got the following impression: It does not work as well as the original OEM system in that the speedo is "lazy". The needle on the speedo does not move (stays at the bottom) until I hit about 25-30 MPH. So driving through a parking lot, etc. you are going "zero" MPH. At about 25 MPH it jumps up and begins displaying the vehicle speed. It also does not seem to react quickly to rapid acceleration. However, once up to any speed above 25 MPH it is good for cruising at a fairly steady speed. Much better than no speedo at all. And not bad for a $40 fix.

StraightTimeStirrups

My guess is that the wss reluctor/sensor is only capable of producing x amount of amperage and its being split up to run your speeding and abs controller and that is why you're seeing the lag. I wonder if running a simple signal amplifier would correct the lag you are experiencing in your speeding?

StraightTimeStirrups

Speedo

MillsMotorvation

Dang I hope this works!!!!