Megasquirt on a Distributor VR6

[need_a_VR6]

Not a fancy title but one you can search to.

Got one of the first running almost two weeks ago and I'm finally getting the time to get all the information up. I'll put it up in stages in this first post so be patient. Having problems with my ftp so I won't have screenshots and the .msq until tonight.

I will assume that all those reading will have base MS knowledge. Those who don't feel free to ask some questions.

1992 SLC engine/drivetrain into a 1992 GTI (my old one). Car has been running a stock chipped ECU for a little over a year. All factory sensors have been used, only addition to the engine bay is a single vacuum line for the map signal.

Wiring is straight forward from a cut up Motronic ECU connector to the MS DB37 connector. I will post the pinout below.

[MS to Motronic Pinout Placeholder]

Board built and tuned by me.

MS1 V3
MSnS-E 029t

Board mods/hardware:

VRIN - TachSelect
TSEL - VROUT INV
D14 with pullup to IGN (no VB)
Both VR pots fully CCW

Launch Circuit

Tach Circuit (not working yet) w/ 2k pullup

TIP120 for PWM idle valve with 1N4001 flyback diode between output and 12v

Remove Q4, Q20 and R39. replace R39 with a wired link or solder the (E) emittor to the right side of position R39 rather than at the Q4 position.

Innovate LC1 wideband to stock narrowband O2 pigtail.

MSQ: http://www.msruns.com/download.php?id=5661 you will have to register/login until I host it

[Placeholder for configuration screenshots]

The maps are street tuned about as good as they can get and I will NOT post dyno tuned maps as they are customer owned. So, don't ask

The car with this ECU ran 14.0's all day at Waterfest on Sunday despite non-ideal conditions.

Enjoy!!

Modified by need_a_VR6 at 1:47 PM 7-26-2007


Modified by need_a_VR6 at 9:06 AM 1-2-2010

[sdezego]

Nice work

[VWralley]

Thanks man! great info

[need_a_VR6]

Thanks I'll get the real msq up later tonight for those that want to download and go

[fourthchirpin]

interesting....pm sent.

[darren p.]

Good stuff Paul...hurry up on a coil pack one.

I know you haven't done it yet but what, if any difference do you for see between the OBDI coilpack motors and OBDII? Does the distro VR use the same style IAC valve as the coilpack motors?

[need_a_VR6]

The only difference as far as the setup is concerned is that the OBD2's have the idle valve in the throttle body. I'm pretty sure though it will even work without the uprated transistor I posted above, as the OBD2 idle motor is a much lower current unit.

The OBD1 cars all have the same IAC, either distro or coil.

Working on it though.. hopefully I'll make some nice progress in August without all the races taking up my time.

[need_a_VR6]

Wiring Schedule:

Motronic T68 Pin # ---- MS Pin # --- Function

1,7,10,33,55,56 ---- 8-19 --- Ground

36 ---------------------20-------- IAT+
14----------------------21--------CLT+
41----------------------26--------TPS+
40----------------------22--------TPS
20----------------------23--------O2
67----------------------24--------VR+
68----------------------7----------VR-/VR Shield
22----------------------25--------Tach
27----------------------27--------PWM 12v
23----------------------28--------12v supply
53----------------------30--------PWM Idle (Fidle)
3,24,26-------------32/33-------INJA
2,4,25--------------34/35--------INJB
8-----------------------36---------Ignition Out
6-----------------------37----------Fuel Pump (Relay)
28---------------------37----------Heated O2 (Relay)
X-----------------------29----------Launch

T68/9 needs to be pulled to ground to turn the ECM relay on. There's a 12v ignition hot supply to the ECU that I didn't write down. It needs to control a relay that pulls it on. The stock ECU must have an internal transistor to do this. I'll post up that fix when I do it

Sorry for the sloppy order but it's how I think.

[need_a_VR6]

Tach circuit works with a 4.7k pullup.

The 'funny' issues with the fuel pump relay were solved with an additional relay. T68/9 is grounded through a relay that's switched on with ignition hot on T68/38, the other two pins of the relay (contact and coil ground) are grounded at the MS at pins 14/15.

[92rado2.8]

I was just going to do a whole big post but Paul got to it before me.

The vehicle is mine and Paul did a great job with the wiring and getting all the bugs worked out.

I will put up some pics as soon as I can. If anyone has a question about the car feel free to PM me,

[deviantsoldier]

need_a_vr6, can i use your spark advance table on my mk4 coilpack vr6 to start off with? will it be accurate since you have a distributer?

[MySunRoofWorks]

This is great, I have been thinking about doing this for awhile on my coilpack 93 Corrado. Keep it coming!

[Tire_Marx]

anything else done to the vr, or 14's on stock motor with MS?

[need_a_VR6]

Spark map should work on a coilpack car, even the wheel decoder settings should work. Just have to use three spark outputs instead of just the one.

The motor is a stock 92 SLC motor with a Mk4 headgasket, intake and 2.5" TT exhaust.

[deviantsoldier]

Outstanding. i got my vr6 running yesterday on your spark and fuel maps. thanks need_a_VR6

[92rado2.8]

Quote, originally posted by Tire_Marx »

anything else done to the vr, or 14's on stock motor with MS?

Yeah it is pretty much stock, Along with what Paul mentioned I have a 42 draft design test pipe, no ac or ps, no front sway bar, started to mess around with my intake mani. Thats it. I have a set of schricks waiting to go in but I need HD springs and a couple of other things first.

Just wanted to also say that Paul is a great guy and has helped me out alot over the years, throwing parts my way and some tech support. I would not trust anyone else with wiring up a MS. The inside of my MS looked better than my mother board in my computer

[all-starr-me]

what's gonna be the advantage of a distributor or coil pack over each other as far as cost, ease of use and spark control? I have parts and harnesses for both and am deciding what way to go in the spring for my coupe.

[need_a_VR6]

Distributor is only one spark output, and the coil is three. Distro would be a bit easier, but in the grand scheme of things they're not that different.

[surfer1992]

ahh I did somthing wrong... I burned the VB921.....

any advise ?

[need_a_VR6]

Whats the setup? On this install I didn't use the VB921.

[nuts4boosting]

im sent

[deepgrooves74]

Hey Paul... I was told to give you a shout from Scott over at USRT concerning help putting together a Megasquirt kit for my car.

Thanks!
cj

[need_a_VR6]

Shoot me a PM

[edge-motorsports]

i also run have been running a similar ms setup for a little over a year in my autocross car. it was a grat upgrade from the stock ecu. we went from 192whp to 214whp with just megasquirt.

i don't normally drag race but we took it to the strip at the end of the season and ran 12.2 consistently..it was fun! (its in a mk1 jetta coupe by the way)

i would recomend MS to anyone as a good upgrade for a vr6

[ade007]

i have my coilpack vr6 running on your msq just altered a few settings as mines direct coil pack wired with 3x vb921 cheers

[need_a_VR6]

Good stuff, glad it worked for you!

[ade007]

i run 36lb injectors no cat just fitted my techedge linear wideband and been out tuning allday my car has never run as quick im very pleased

[need_a_VR6]

When you're done make sure you put the msq on msruns!

[MySunRoofWorks]

Paul, what MS unit do you recommend to use with a coil pack VR6? Also do you think it's better to buy a pre-built unit or if someone has decent electronics experience, to build one?

[need_a_VR6]

Either a 3.0 or 3.57 depending if you want to solder a lot or not. The 3.0 isn't bad to assemble just a lot of parts! If you find that sort of thing FUN, do it, you'll learn more just by seeing the hardware and reading the assembly manual then anyone with a prebuilt. I like building them myself but my time is limited and I'm getting prebuilts from DIYAutotune now.

[MySunRoofWorks]

Quote, originally posted by need_a_VR6 »

Either a 3.0 or 3.57 depending if you want to solder a lot or not. The 3.0 isn't bad to assemble just a lot of parts! If you find that sort of thing FUN, do it, you'll learn more just by seeing the hardware and reading the assembly manual then anyone with a prebuilt. I like building them myself but my time is limited and I'm getting prebuilts from DIYAutotune now.

I have plenty of time and solder these days. Thinking about picking one up after the new year. I'm trying to squeeze every last pony out of my NA car before I give up and go FI.

[ade007]

i bought mine from phil ringwood extraefi.co.uk pre modifyied to suit my coilpack vr6 and i asked for pauls msq to be pre installed but altered for coilpack all i had to do was turn my required fuel down to from 13.6 to 7.2 to suit 36lb injectors @ 4 bar .. it came with a short lume to wire to stock ecu plug all coulor coded and wires labeled with a pin 4 pin diagram it made it a very easy install for me plug and play if you have an old ecu to break up for the socket


Modified by ade007 at 3:11 AM 12-30-2007

[ade007]

ok matey i will put my msq on msruns... i have been very busy i fitted a turbo now i will put that msq on too when ive done some tuning

[Dead-Rabbits]

Can anyone help me at my options for my MS2 V3.57 Firmware 2.687 to start my VR6 Turbo Distributor Engine ???

I have ignition and fuel, but the Engine doesn't start.

[need_a_VR6]

I got your email, just send me your msq and I'll take a look.