GTS346

iTrader: (1)

Can somebody tell me how many pulses per revolution does the factory PCM require?

As I need to buy a VSS for a TH350 conversion.

P Mack

iTrader: (6)

Should be 17 on a 6 speed, 40 on an automatic.

GTS346

iTrader: (1)

So it doesnt matter if its a 2, 3 or 4 speed auto, as long as you get a 40 rev speed sensor it will work, no OD.

P Mack

iTrader: (6)

It's not the transmission that matters. If you have a computer from an automatic car it's gonna be programmed for 40, if it's from a 6 speed it'll be programmed for 17. And if you have a tuning program it doesn't matter cause you can change the value. Hope this helps.

GTS346

iTrader: (1)

My car has been tuned and will be modified again thru HP Tuners, does this mean I can use any Sensor even a 2 pulse per rev sensor?

P Mack

iTrader: (6)

Yeah, I tried putting 2 in the value in hptuners and it accepted it. Your speedometer might act jumpy at low speeds with that low of resolution though.

GTS346

iTrader: (1)

Did it stop low speed surging and stalling problems normally assosciated without running a sensor?

Is the speedo accurate when cruising along?

Any other symptoms?

GTS346

iTrader: (1)

My car does have a manual computer so it reads 17 pulses but all I can get in the way of aftermarket inline speed sensors for a TH350 is a 16 pulse.

Will this be accurate enough without changing the values?

P Mack

iTrader: (6)

It'll read 80 when going 85. Is your differential gonna be 3.42?

GTS346

iTrader: (1)

3.50:1 how far out will it be at 60 mile per hour?
How do I calculate it?

P Mack

iTrader: (6)

If I did my math right it will read 58 when you're going 60 with 3.50's, 16 pulses per rev, 26" tires and a stock m6 pcm. I used:

speedometer reading = actual speed * actual gear ratio/programmed gear ratio * actual pulses per rev/ programmed pulses per rev * programmed tire diameter / actual tire diameter.

Uk Robert

GTS346, where did you get the in-line speed sensor from and how exactly does it fit in-line. I`m building an LS1 powered Ford Capri with a TKO 5spd and would much prefer your arrangement rather than a reluctor wheel on the prop-shaft etc.

GTS346

iTrader: (1)

I havent yet, all the inlines I found were for hall effect setups, we need a magnetic pickup 2 wire, I am working on something, will hopefully figure it out with the next week or so. let me know if your still stuck.

Uk Robert

I`m still trying to get to grips with this speed sensor thing. Anyway see my post in Hybrids/Conversions re reluctor wheels etc etc....!