Just hand me the pliers.
VSS analog to PWM
Ok so im converting to manual in my VS, I have a remapped ECU, but of course as eveeryone knows I miss out on the Vehicle Speed Sender, as the standard VS auto ECU uses Pulse Width Modulation (PWM) and the T5 I am using uses an oldschool analog signal, like high or low voltage.
So after considering all of the possibilities, such as.
1. Locate and use the correct ECU (To expensive and ahrd to track down)
2. An off the shelf converter (Could only find them in 8 pulse, I need a 40 pulse)
3. go without (Is problematic
4. changing over to a completly different ECU (Can be expensive and allot of mucking around that can result in everything not working)
So in the end ive decided on this as my project.
The picture below is a little rough and ready but hey, I did my best.
Basically the shaft of the old VSS goes through a bearing (for support) and into a plastic hobby box (Trying to reduce the amount of magnetic metal as not to affect the PWM generator.
the PWM generator has to be placed correclt alignment and distance from the reluctor ring are crucial, I have the figures somewhere, otherwise, back to google I will go :P
finally it also comes down to the gearing, need to get 40 pulses per driveshaft revelution for it to work straight off, otherwise a speedo corrector kit will be needed.
Anyone got any thoughts? any info? anyone allready done it? or is anyone good enough with circuits to make a PWM generator that increases pulses dependant on input voltage?
Better yet anyone seen a 40 pulse PWM generator on the net for sale, they basically replace the old VSS, plug right in, as the cogs turn it creates a PWM signal.
Just hand me the pliers.
I think I found an off the shelf item that does this. With the amount of people doing manual conversions and using the auto ECU, I thought there would have been more interest.
on holiday
i think the jaycar speedo corrector may be able to do it or there is another unit that can do it just noone has tested them and proved it works yeti can get a link for the one to turn sine wave in to square wave out or vice versa if you need it
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
Just hand me the pliers.
That would be great thanks Delco, I have scoured the net and have found what I hope is an off the shelf VSS, that will go directly into a T5 without any modifications, and emit a pulse wave for the AUTO ECU, so I might be in luck anyway.
I just don't know why it isn't talked about more, I mean arn't allot of people having conversion issues, or are they just lucky enough to have an ECU that suits?
on holiday
http://www.sideshowsperformancewirin...?categoryid=21 scroll down mate they have the box for the job
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
A new project attack
I thought the auto VS ecu has the manual speed sensor reading in it already? Only the VS ecu though.
on holiday
only certian VS auto ecu's have the nessacary internal componants
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
Just hand me the pliers.
well i've allready bought a VSS, hmm maybe i'll buy both :P
on holiday
just be aware this all could be a waste of money if the ecu is seeing auto speed pulses cause its programmed with specific gear ratios in the tune and it may pack a mental at you due to the manual having different gear ratios
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
Originally Posted by delcowizzid
it will be fine, if the pulse is actually suitable to be read through the auto vss pin. Thats just the same config as a getrag gearbox
Just hand me the pliers.
If not I can always send it back to you for a retune :P
you'll need to send it back if your using the the auto/getrag pin, otherwise it'll work straight up if you use a T5 PCM. I'm still keeping an eye out for a T5 PCM for you
Just hand me the pliers.
No worries, thanks, let me know when one comes your way.you'll need to send it back if your using the the auto/getrag pin, otherwise it'll work straight up if you use a T5 PCM. I'm still keeping an eye out for a T5 PCM for you
So while using the Auto ECU with a pulse VSS that will connect to the gear on the output shaft of the T5, I still need to send it back to you?
if the waveform of the VSS your using is
Inductive (auto style) - you will need to send it back
Hall Effect (stock T5 style) - you can just use it provided the pcm will read it
If you're using a circuit to convert the hall effect vss to inductive or replaceing the T5 vss with a inductive, i can switch the tune for you, then you can use a jaycar speedo corrector before the dash/PCM to get the correct PPK.
Last edited by ejukated; 27-06-2011 at 12:57 PM. Reason: fixed typo
Just hand me the pliers.
whats PPK? pulse per kilometer?
anywho as discussed in PM it will be on its way back to you soon
yeah, PPK=Pulse Per Kilometer
Just hand me the pliers.
yeah its a hall effect output, with an inductive style input, I'll just put the gear from my current VSS on it and it should go fine, that chip will be in the post tomorrow.
where did you get the VSS Danny? i've converted my VS V8 and im very keen to get it running sweet. cheers!
Just hand me the pliers.
I can't prove that it works yet, I still havn't even put the box in my car :P
i'm 100% sure it will work though. Here is the link for everyone.
Speedometer Gear, Speedometer Gears, Ford, GM, Dodge 700R4
This is the item I got, its a ford part, but it should do the trick, I havn't even had a chance to match this up to the gearbox yet as my T5 is at my friends workshop and my car is off the road due to it catching fire.
If you buy it, and later we discover its no good, I wont be held accountable for your loss.
I'll let you know if it works, you may also need to have your memcal tuned again, there is an option for what type of VSS to use.#9SS. Ford 8 pulse speed sensor for the above driven speedometer gears. This speed sensor works with cable only, pulse generator only or both cable and pulse generator at the same time. Works with speedometer cable number 4190. Cost $39.00
on holiday
as long as it fits the box and you do the math to correct it for the difference between 8 pulses and 40 pulses per turn of the driveshaft and enter the correct value should be sweet as ide say
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
Just hand me the pliers.
Yeah couldnt find a 40 pulse, I wonder if ejukated can just factor that into the tune for some extra mulla?
Posting Permissions
LinkBack URL
About LinkBacks
Reply With Quote