3tgteu on Mega squirt?

[thechuckster]

one thing is going on now.. wanna ask you guys's opinion
eventually i plan to run ignition control from MS via distributor VR sensor.. but after reading some articles, i plan to use back my OEM ignition system (toyota ignitor and coil).
can i share the signals from the VR sensor between MS and the ignitor? can i just splice the VR sensor wires (red and white), and run 2 wires to MS and another 2 to the OEM ignitor? in this way i can run fuel control from MS and OEM ignition system.

You may as well treat it as a fuel-only setup:
-OEM ignition system runs the spark
-use tacho output from OEM ignitor to triogger the MS

VR sensors can't be shared across two devices

In the long run, you could lock the dizzi (assuming it's not already) and then use the VR output to drive MSnSE (e.g. fuel & spark), then use spark output A to drive a VB921 (or the OEM ignitor) which in turn drives the coil.

cheers,
Charles.

[RA23]

Good to see that there are more squirters on Toymods. I have build my MS a year or so ago and intend to use it on an 18RGEU. It came with a Haltech F9, which is all wired up and I want to get that running 1st and when I know everything is right, replace it with the MS. Should also be within a few months. I will be doing squirt & spark. Will be using EDIS for spark.
In the mean time I'll be following this thread.

[CHB]

You may as well treat it as a fuel-only setup:
-OEM ignition system runs the spark
-use tacho output from OEM ignitor to triogger the MS

VR sensors can't be shared across two devices

In the long run, you could lock the dizzi (assuming it's not already) and then use the VR output to drive MSnSE (e.g. fuel & spark), then use spark output A to drive a VB921 (or the OEM ignitor) which in turn drives the coil.

cheers,
Charles.

thanks for ur opinions.. i've read thru the megamenual last night. i'll assemble the Step #51b which allow the MS to be triggered using the negative of the coil, after that, i'll change the jumper settings accordingly.. hope that will work..

[The Witzl]

You guys seriously need to upgrade to a Megasquirt-2!! They are a whole massive step up from the old MS.....

[oldcorollas]

thanks for ur opinions.. i've read thru the megamenual last night. i'll assemble the Step #51b which allow the MS to be triggered using the negative of the coil, after that, i'll change the jumper settings accordingly.. hope that will work..

and yes... MS2 is leaps n bounds ahead.. but playing with MS1 first is good cos the maps are more coarse, and there are less variables to play with... you'll want MS2 in about a week or two after you get 1 running



when you do this, it is better to use a resistor inline to suppress noise..

i made graphs of the noise vs resistance when i was checking my triggering...


check out these snazzy graphs (datalogs from MS itself!!!)
http://www.materials.unsw.edu.au/~sf...h-testing.html
http://www.materials.unsw.edu.au/~sf...-testing2.html

if possible, check your coil signal beforehand.. possibly put it on another car and drive, just taking the signal, so you know what resistor is best.... or just use a 15K resistor.. (i needed 10K minimum, 50K maximum)

[thechuckster]

meh - with dual tables for spark and fuel (all at 12 x 12), plus AFR tables (at 8 x 8) and oodles of outputs, i'm happy with MS as it is.

If you need 16 x 16 tables, me thinks your engine is in need of attention.

Wilbo's waiting for the surface mount version (UMS) - but that's because he's a total geek and does surface mount soldering by hand in his sleep.

[gearb0x]

YA MS1 with MSnS is very good and more flexible than MS2 at the moment, once they get this router board and GPIO w/ CAN working on the MS2 itll be unbeatable

As for the twin spark, if you want to junk the dizzy im pretty sure you will need 4 wasted spark coils, and wire the outputs of each coil to to separate cyls so when you come to fire time you have 2 coils igniting the mixture rather than 1 driving 2 plugs. I think you could get away with running 2 itnition outputs to 4 ignitors for the coils.

Of course you will need CAS/trigger wheel of some sort

[3tgte]

Hello to all, I am currently in the process of tuning my 3tgte on MSII, I am using the ford EDIS system, I have two coil packs wired together and it starts and runs fine. The VE generator will get you close enough to start the car. After turning her over and checking for fuel, spark, and all signals to the ecu it started on the first attempt. I will have no problem sharing tables once they are dialed in well enough. I can tell you that the system is worth the money and works very well. I definately recommend the wideband setup, myself I have the LM1 and the readings between the LM dispay and the display for the MSII are within one half of a volt. I will be happy to answer any questions anyone might have as best as I can.

[The Witzl]

I'll be having more to add to this thread soon too.... i'm right now building the new loom for the MS-2 on my 18R-GE whilst it's out of the car, and will be putting it all back in over the next 2 weeks or so. (yes, i am actually FORCED to use the MS-2 this time)

I'm interested to hear what the extra flexibilities are with the MS1 with MSnE over the MS2?


As for how I am running the ignition circuit....

Well i found a GM HEI-8 ignitor in the guts of a camira dissy, and was mildly excited to find it's level of ability (see here)
So i liberated it from the camira at piccies. I'm getting the stock electronic dissy welded (locked), and the VR signal will be going to the MS-2.
The ignition output from the MS-2 will then be going to the GM HEI-8 ignitor, with dwell control done by the MS-2 (since GM HEI is a dumb ignitor). The coil will probably be just your standard 18RGEU coil, unless i find something better.

I would like to run a wasted spark system, but can't be bothered rooting around with the ford EDIS system, i'd rather use a flip-flop circuit of some kind that picks between the two ignitors/coils.

[c budge]

has any1 had any luck with 1 yet

[thechuckster]

hell yeah!

Karl & I had MS-powered cars at the Toyota Nationals this year

Chris (from Tassie) has had his 18RGUE running MS for a few years now!

[The Witzl]

Yeah my 18R-GE is running very successfully on an MS-2 v2.687t4 B&G code. Has been driven daily for the last few months too, hardly a problem to report really.

I run both ignition timing and fuel from the MS-2

Here's the dyno result from last weekend - http://www.18rg.com.au/RA28/18rge-ms2.jpg

The trick is to plan out the way you want to run your ignition system FIRST, and buy the right parts up front.

Best way in my opinion is to use the VR signal from the dissy as your "tach input". Do this by getting the dissy advance plate welded so that it's locked into position and doesnt move like it does from stock.
Then run the VR signal into the tach input of the V3.0 pcb.

The choice of using the VB921 driver is up to you -but being that you need two simultaneous coil outputs (twinspark), you are probably better off using an external ignitor. (im running the VB921 and a bosch MEC718 coil)

The rest is easy stuff really.

[Chrisso]

Woot! Great thread. Thought I'd subscribe to this one as I'm just about to order an MS2 kit to run a bigport 4age (stock internals, headwork + ITBs).

Time to learn about electronics!

[3jcelica]

The witzl,

Did you use the GM HEI stuff with a locked dizzy or did you end up using the VR signal and toyota module.

I am thinking that I might use a GM HEI ignition module with a locked dizzy to drive a dual post coil. Do you see any issues with this setup?

Can a single channel ignition module drive a dual post coil because this will simplify things some what. Then I can sell off my standard EFI gear with the correct dual channel module that drives the knock control.

Thanks

Roger

[The Witzl]

Roger,

I did try using the GM HEI on my locked toyota VR dissy..... but....

DONT use the GM HEI ignition modules with a Toyota VR sensor.... the only work up to about 3000rpm, and then they go spastic. Literally spastic.

I ditched the GM HEI, and fed the Toyota VR signal directly into the V3.0 pcb VR circuit, and havent had a problem with ignition since.

I also am using the VB921 ignition driver, to drive a bosch MEC717 coil directly.

I dont know if you can use a twin post coil like you are suggesting... i'd ask that one on the MS forums.