Poor tach signal

[240Psycho]

Got the car to fire up for a second,

First, all the info you need on the car

Perfect Power- Pro Race System 4
Vr, flywheel sensor (stock sensor for lh2.4)
Stock coil
The setup in the software
Dwell time-----------2.0
Pulse per turn--------60
pulse per firing-------30
base pulse position---1
Adv. Ignition Limit----44
Ret. Ignition Limit----15


I hooked a timing light up to the coil to distributor wire and it would fire randomly.

The cranking RPM is normally in between 180 and 700 rpm and spikes to 9k rpm rarely.

My womans intuition tells me its the flywheel sensor(Vr)

Right now the wires for the VR sensor are just twisted together and butt end crimped, Id like to get this straightened up before i solder and heat shrink.

if i can't get this going.
im going to get a hall sensor, seems easier anyway

Im getting fuel, now all i need is consistent spark

Thanks
~Kyle

[240Psycho]

i changed the base timing, rechecked the wires and went over a few settings but it still wont start.

I need help.

[MrBill]

I dont wanna burst your bubble,
but youre asking how to fix lunux on a windows forum man.
If you need our help, you pretty much need to have megasquirt.
Maybe someone has the same system, but we dont know the parts around your system.

[240Psycho]

well what i really need to know is what is a good timing/ fuel starting map.

just think of it as mega squirt only 16x8 maps

The perfect power forums suck real bad. made a thread back in october of 06 and still no reply, and its the newest post...

http://www.we-todd-did-racing.com/files/995904_pshbn/ign-map.JPG

[sb765t]

hey,

you may want to check out www.efi101.com. they have forums there, and at the end of the list is "other manufacturers" it gets a fair bit of visibility, and the guys there are great. Ask Ben Strader directly if you have to, he can get you on the right track. Amazing courses, as well. No affiliation, just a satisfied customer.

[MrBill]

well i think your map is wayyyy too retarded. Odd to see ignition/throttle position, instead of map.

Do a search around here for maps and youll see much more advanced at the low rpms

[240Psycho]

well i think your map is wayyyy too retarded. Odd to see ignition/throttle position, instead of map.

Do a search around here for maps and youll see much more advanced at the low rpms

ok that helps. alot. would 15 degrees be too advanced?

[242Fast]

if your system has positive degrees as Before top dead center, and negative degrees as After top dead center. Then you need something close to 12* to 20* at idle. Volvo calls for 12* BTDC at 900rpm or something super specific like that. I think most of the MS foos (me included) run around 20* advance at idle.

all that stuff about 30 pulses and what not is confusing to me, make sure you know what the #'s on the table equate to in 4real life, if it's not a direct correlation then you need to figure that out now.

[MrBill]

I think it means how many holes your flywheel has?
Like what is the volvo wheel 24-2? 60-1? Maybe thats what it wants.
Just shooting in the dark. 240Psycho, i would make the whole map like 10-15 degrees advanced, the car will run (not well) and you can eliminate a bad spark map from the picture. It will be very slow till you fix it, but it will run.

[240Psycho]

I think it means how many holes your flywheel has?
Like what is the volvo wheel 24-2? 60-1? Maybe thats what it wants.
Just shooting in the dark. 240Psycho, i would make the whole map like 10-15 degrees advanced, the car will run (not well) and you can eliminate a bad spark map from the picture. It will be very slow till you fix it, but it will run.

your on the money.

There are 60 total teeth with 2 missing

For some odd reason that was the ign map the software came with. i changed it over to more volvo friendly timing, stolen from a saab map.

thanks for the help
~Kyle

now i need to know at what tooth does the #1 plug fire at on the flywheel.

[MrBill]

well maybe i can help here too.

Do you have a timing light? What you need to do is set a few cells where your map wont change (10* makes it REALLY EASY).
Look at the timing, and then adjust it in the software until it reaches 10* Im sure there is a mathmatical way, but guess and check is perfect for this situation.

So does the poor tach signal still occur?

[240Psycho]

hmm i wrote a response last night but i guess i never hit post...

I figured out where on the flywheel TDC is, its 15 teeth in from the blank spots.

I got it started last night but couldnt keep it running. the tach signal is still all over the place. Would exposed wire have anything to do with the tach signal?

I wanted everything working and running before i buttoned it up.

Thanks for the help
~Kyle

[MrBill]

is your tach signal wire shielded?

On megasquirt, it is supposed to be grounded on the computer side, and then touch nothing on the VR side.
You should check the sheilding, or maybe make a sheild.
I'd look into a new sensor also, although a hall sensor dizzy would fix all:)

Maybe sell perfectpower thing and buy MS?

[240Psycho]

is your tach signal wire sheilded?

On megasquirt, it is supposed to be ground on the computer side, and then touch nothing on the VR side.
You should check the sheilding, or maybe make a sheild.
I'd look into a new sensor also, although a hall sensor dizzy would fix all:)

Yea im thinking hall sensor is the way to go.

It is shielded and its a known working sensor, the shielding is grounded where the ECU is grounded at.

I had one person tell me crappy ignition wires could give it a wierd signal, but i doubt it.

[MrBill]

Well not sure what to say. Try out the hall sensor and report what happens. Im gonna suggest you wire the distributor out of the car and turn it with a slow drill, or somethin, its ALOT easier than trying to get it to work in the motor, espically if you have other problems

[240Psycho]

Well not sure what to say. Try out the hall sensor and report what happens. Im gonna suggest you wire the distributor out of the car and turn it with a slow drill, or somethin, its ALOT easier than trying to get it to work in the motor, espically if you have other problems


excelent advise.

im going to try another vr sensor and try reversing the wires on it (just cause its free)

then its off to the junkyard!

Thanks for all the help guys.
Hopefully i can get this going and open Perfect Power up as an option to the volvo crowd, not that megasquirt isnt good (in fact i wish i had gotten MSnS) but its more options that people have.

~Kyle