Electronics help with TPS circuit.

[Mos]

i have an electronic device that can take the 32pulse 3 wire signal and make it a 4 pulse 2 wire signal
but its 330 bucks just for the unit

Jim, but does this unit spit out a reluctor signal or squarewave? If squarewave, I have made one for less than 330.

btw mos, just remembered, when i put in the smallest restrictor plate in my exhaust, which limits boost to nearly stock (12psi) it doesn't hit the cut as early in the rev range, sometimes doesn't hit it at all!
sorry i didn't remember this at all, but the exhaust and increase in boost probably have something to do with it.....

I would say this behaviour is consitent with my assessment of the issue? I'd also say if you added an extra 200kg to your car it would probably never happen.

Mos.

[BMWTurbo]

MOS I'm using my tacho for RPM readings. I've tapped in to the IG- feed to the diagnostics port on the inlet manifold that is fed the pulses from the ignitor. I've built a little circuit to amplify this and am feeding it to my BMW Tacho.

Rev limit is reached at jsut over 7000rpm as can be determined and proven by holding it in first until you reach it whilst watching the tacho. This was conclusive enough for me.

Speed sensors I have nothing more then factory fitted to the Toyota ECU< I have not interfaced any further then this.

My car is a lard arse and I believe is easily over 1500kgs. the BMW factory weight is 1540kg's. I have stereo etc on top of this so would expect to be around the 1600kg mark.

I throw no error codes when the diagnostics are entered, the check engine light just flashes on off for as long as you leave it in the mode.

Std extension housing right down to the rubber donut. I have fitted an FCD, 3inch ehxuast, custom dump to replace cast restirctor (trhis has a 3inch-2.5inch cone restrictor placed in it), back throught mandrels to a 3inch steel CAT and then through a 22inch long 3 inch resonator back to a berkley 3inch in twin 2.5inch out opffset muffler.

[cambelt]

The sp2 pulse is a relucter pulse and both of its wires must be isolated from ground or power , as its a AC voltage i dont think sidecutters box would work on modifiying the signal.
I scoped the pulse from the mx83 sp2 a couple of years ago and its very different to the reluctor sp2 pulse . You can find a 4 pulse sp2 sensor in a soarer (relucter type), with the slip yolk ext housing , but the waveform output is still diifernt to the aristo one .
Jist of all this , is you must run the 4 pole relucter pickup that came with the aristo , unless there is a way of making a AC pulse .
Dave

[Mos]

The MX83 SP2 is a squarewave, either an open collector output from the ABS computer, with a pullup in the ECU, or a reed switch activated by a single magnet shorting to ground, also with the pullup in the ECU.

Most reluctor inputs have a +ve and -ve with the -ve usually tied to signal ground internally.
The reluctor waveform will be squared up internally in the ECU, and the saving grace is that some reluctor signal input circuits will accept a squarewave, however I haven't tried it off the bench.

The shape of the reluctor signal will depend on the shape of the rotor (the width and ramp of the blade), and probably other things. In my understanding, all that the ECU looks for is the falling edge zero crossing, but there could be other aspects of the waveform that are important - anyone?

BTW, not all soarer SP2 rotors are 4 pulse... single turbo 1JZs have more.

Mos.

[PlacentaJuan]

mos what would be a more accurate way to measure rpm while on the move?

is there a special type of multimeter or something that would be more accurate than the standard tacho?

[cambelt]

Thats right mos , the other 4 pulse rotor out of the soarer has the relucter tpye sp2 , but the sensor rotors teeth are much shorter than the aristo one . You just dont know what the designers think when they design these things and why they change these things around. Toyota spend many millions in design so some of us small time know it alls arnt going to be able to work out every ecu function , ie trac control comunication , transmission comunication .
you should see the codes that a uzs 131 spits when u just wire up the engine only .
Dave

[sideshow]

its an anaalog output thats y its expensive i also have digital ones but they are half the price

ive seen other units that do square wave and even the jaycar one can do something but i would never go near them i doubt your one is as complicated as the units i used
they have 4 long ics on them and alot of other stuff
when it comes to hi rpm signals and stuff i will not buy shit cheap stuff when you need to modify the signal



reason the signals change between mx83 and soarer is the mx83 rear gbox sensor does the abs
so u cant have 4 pulses you need alot


the soarer has abs sensors on all 4 wheels so they only need a signal on gbox just to chnage gears

ive wired up many toyotas and never had probs when i only wire up the engine

aslong as its a complete set

ive only had 1 prob where they got the engine from ichiban and the idiots there gave him wrong gbox ans ecu nothing matched and i could never get it to run right

these days if i get a job and the engine came from ichiban i tell the customer that there might be another 100 or 200 bucks on the bill cause to many times ive been fuked over cause of ichiban givin them wrong parts anyway back o the problem

on my 1uz crown i have sp1 and sp2 connected

if i modify sp1 the car still changes the same cause sp2 is the main signal
sp1 is the backup

when i do crown 1uzs the customer doesnt want to spend the extra money to get sp2 hooked up so all i do is hook up sp1 which is ok but if sp1 stops working the gbox wont change gears

hooking sp2 up might not fix the problem or it might

unless u try u will never know its an expensive test hehehehehe

i hate it when people go to the trouble of chnaging rear of gboxes because it can create alot of small problems and ive wire up engines and non matchin gboxs and have had probs when we wire up the proper gbox it fixes everything

maybe you could find a stock 2j auto supra and unplug sp2 spped sensor on back of gobx
and see if it cause a similar problem

[Mos]

its an anaalog output thats y its expensive i also have digital ones but they are half the price

ive seen other units that do square wave and even the jaycar one can do something but i would never go near them i doubt your one is as complicated as the units i used
they have 4 long ics on them and alot of other stuff

Fair enough. The Jaycar one won't do divide by 8.
Yep, mine is simple, but you can choose your divisor

ive wired up many toyotas and never had probs when i only wire up the engine
aslong as its a complete set

I've been forced to wire up many incomplete sets (ie with missing SP2) and seemingly it does not cause problems.

on my 1uz crown i have sp1 and sp2 connected
if i modify sp1 the car still changes the same cause sp2 is the main signal
sp1 is the backup

Just curious if speed cut goes off only SP1 or both SP1 and SP2? Have you played with SP1 to remove the speed cut without touching SP2 with success?

hooking sp2 up might not fix the problem or it might
unless u try u will never know its an expensive test hehehehehe
<snip>
maybe you could find a stock 2j auto supra and unplug sp2 spped sensor on back of gobx
and see if it cause a similar problem

BMWTurbo has the complete set and it looks like it's behaving the same way, suggesting SP2 is not an issue.
So there are two solutions to doing SP2 then - the electronic one and the mechanical one.

Mos.

[sideshow]

has anyone got this problem using a std 2j and matching auto transmission with no mods
done to ti to suit the cressida

all the 1js and 2js i have done are for everyday customers who do not waste all their life on forums heheheheehh
so they dont really know about modding the back of gbox to suit the cressida
so when i wire up a 1j or 2j in a cressida the abs doesnt work because they dont have the abs sensor fitted

i can get it working but its not cheap not cause of labour but cause of parts

my device can multipy by 3 or 4 and can divide by very tiny amounts so its very good divider and ok multiplier
but it can multiply by 5 or 8 if you wire it up another way

but multiplying by 8 causes a prob

say u have 4 pulse ring and you need to multiply by 8 to get it to be like the 32 pulse ring
well every single signal of the 4 pulse ring gets mutliplied by 8
so instead of having a smooth increase of pulses when you are driving slow the abs ecu gets 8 pulses in small bunches and the abs ecu thinks back wheels are goin faster than front for a split second and locks up rear wheels

i have played with this for awhile and there is a way around this

but everyone has to know its not cheap

forums are full of people tryin ot get help but wont spend money

i have solutions for alot of things but i dont waste my time helping everyone cause i dont get much out of it

leave the car with me i will get everything working
or i can get things working good
i have access to spare parts so i can test with other ecus and stuff without paying for them

but if you get a 500 ro 1000 dollar bill then dont complain

my way of wiring cars is use all of the new engine /gbox ecus etc and then sort the rest out that way you get less problems

anyway just like they said on jerry macquire

show me the money and ill fix it

but you have to wait a month these days to get any major work done

so whether people want it fixed or not doesnt really worry me

i actually pick and choose what i do these days so im actually having a rest at night and on some weekends

if you can wait till mid year my friends 1j cressida is coming back up from melb

i will fit one of my dividers to his box and see if it all works

he orig had 1j soarer auto box and it stuffed up so he got box rebuilt but this time fitted

the cressida back sensors and he has complained about something but imnot sure exatly what so if the device works ill let you know

i dont get very much chance to hit speed cut so i never play with it
most people buy 2nd hand shit off ebay like timers and fuel and spd cuts so im not very tempted to fit them cause if there are problems i get the phone calls
so it just puts me off helping cheapscates heheheheeheh

[PlacentaJuan]

im sure you have no problem charging people for information you have got from toymods though hey?

[sideshow]

yes i do heheheeh
one thing i dont chagre people for is the hours of time i spend on the net researching
toyotas are not the only cars i do
and these days i do less of them thank god
hehehehe

what i give is compared to what i get out of it

the day you get my account to make me money for free

i will give out information for free

what do u do for work placenta do u give any freebies away

i bet not

how many people complain about gettin ripped of my their local mechanic

well im just like your local mechanic i have many bills to pay so i chagre 70 to 100 bucks an hour the only difference is i do a much better job than most and when i do get problems i try to solve them rather than push them aside

i used to sponsor this site but they never sent me a renewal which is probably a good thing these days

maybe that was the time i couldnt be fukt helping much

heheheeheheh

anyway ive talked enough shit on here today

time to switch of pc heheheehehehe

[Mos]

MOS I'm using my tacho for RPM readings. I've tapped in to the IG- feed to the diagnostics port on the inlet manifold that is fed the pulses from the ignitor. I've built a little circuit to amplify this and am feeding it to my BMW Tacho.

Rev limit is reached at jsut over 7000rpm as can be determined and proven by holding it in first until you reach it whilst watching the tacho. This was conclusive enough for me.

Sounds good - I got 6800 on the factory tach in the same way, showing how "nominal" the value is due to (in)accuracies of factory tachos

mos what would be a more accurate way to measure rpm while on the move?
is there a special type of multimeter or something that would be more accurate than the standard tacho?

The standard tacho is way too slow to be able to see the engine spiking, if it is indeed spiking. I'm guessing a BMW tacho would also have a fair amount of delay built into it.
There is no real easy way - I'm thinking even a multimeter with a tacho input may not react fast enough to pick it up. Better multimeters have a bargraph display and that may be sufficient to see trending but it won't give you an accurate value. An automotive datalogger should be able to do it accurately.
One could build a frequency to voltage converter (LM2917) with a known slew rate and then measure and observe the voltage on a scope.
I wouldn't trust the frequency measurement function of the scope unless I knew what its refresh rate was.

My car is a lard arse and I believe is easily over 1500kgs. the BMW factory weight is 1540kg's. I have stereo etc on top of this so would expect to be around the 1600kg mark.

Definitely on the heavish side

Speed sensors I have nothing more then factory fitted to the Toyota ECU< I have not interfaced any further then this.

I throw no error codes when the diagnostics are entered, the check engine light just flashes on off for as long as you leave it in the mode.

Std extension housing right down to the rubber donut.

Given you have the SP2 sensor fitted, it would imply it's not a variable.
Also, I'm assuming you have removed all of the traction control gear and that is also not causing error codes to be generated (a OBDII car will generate error codes if the engine can't talk to the traction control computer, even though the communication medium appears to be the same as OBDI cars).

I have fitted an FCD, 3inch ehxuast, custom dump to replace cast restirctor (trhis has a 3inch-2.5inch cone restrictor placed in it), back throught mandrels to a 3inch steel CAT and then through a 22inch long 3 inch resonator back to a berkley 3inch in twin 2.5inch out opffset muffler.

Ah yes, saw it on your website Nice piece of work

Mos.

[BMWTurbo]

Interestingly I've spoken to someon with an aristo (stock) that has said his car exhibits this same issue when mashing the throttle...

Perhaps it's an Fault with the vechiles?

[cambelt]

well out of intrest i got a aristo half cut to do it to also , if you floored it fast it would rev and boost then rev limit at around 4K, i just thought it was cause the car was missing its other half .
Dave

[PlacentaJuan]

well mr1jz has some shit to do to his car, ill try and get him to play around and see if it happens.