Dwizle

After a year or so of playing around with trying to get my own hand built MS II to work in My '86 I finally got the car running and moving under power controlled by MS II
Got the Mistress going about 85 and not bucking or popping and backfiring actually pretty smooth at speed but the take off map still needs work a lil off idle dip. but the car is drivable..
Yeah Me...
But this wouldn't be possible without the insight and help that these 2 Men provided directly or indirectly from post or answering direct question Michael your ignition and AFR maps were a Godsend
used them to set and calibrate my VE maps... Still have a few bugs to work out... 1 tach doesn't work. need to purge air from cooling system too many temp fluctuations amazing what you notice after
looking at your data logs.... figure out away to truly make a cold air intake got rid of Airbox and AFM running a cone airfilter with autozone generic 3" intake tube necked down to fit the J boot with the
IAT plumbed into the tube I am see 160* airtemp sitting still the airfilter is resting on top of the Alt so when the Rad fan fires up I'm sucking hot air, but moving there no problem... think that might be part
of my off idle dip problem..

So here's my setup as it stands
MS II Diy Autotune kit Ver 3.0 untimed Injection, Single coil, extra MPX4250 MAP Sensor MAP for Alt correction I live at almost 5K Alt
HC 05 Bluetooth Module and FTDI USB to Serial Module are hard wired in for tuning.
Injectors: 4 Bosch 0280155868 flows 375 cc/min at a tested pressure of 3 bar, or 36 lbs/hr at 43.5 psi.
flows 342 cc/min at a tested pressure of 2.5bar, or 33 lbs/hr at 36.2594 psi.
Latency (dead time)@ 12volts=0.621 ms @ 14volts=0.391 ms. I have it set to 13volts=0.500 ms Battery Offset= .118
FUEL NOZZLE: 4-HOLE DISC - Ultimate Atomization High-impedance/high-resistance/14.0 Ohms


Crank Wheel http://www.goingsuperfast.com 944 Trigger Wheel
Crank Sensor BWD Part # CSS718 out of a ford
IAT Sensor BWD WT3051 98 99 00 01 Mustang 4.6
TPS Sensor 944 Turbo
CLT Sensor 944
944 DME Male connector 825213-1 35 POS TAB HOUSING http://www.te.com/usa-en/home.html . But I still had make a custom wire harness prob integrate it all into stock harness
Wide Band O2 Sensor Controller Spartan 2 OEM from 14Point7 http://www.14point7.com/products/spartan-2-oem
O2 Sensor Bosch LSU 4.9 Wideband O2 Sensor
Idle Control Valve Bosch 2 wire Idle Control Valve from a Volvo p/n GEGT7610-324

Thanks again Odonnell n Dougs951S

odonnell

Nice work! Interested in your IAC parameters for the Volvo idle valve. Going a similar route on my 951.

Dwizle

Idle Valve Mod
Did the idle valve mod to MS II the valve is 2 wires one to switched 12v and one to IAC pin on MS II then set it up in tuner studio
I decided to disable it for right now while tuning.. Will do more with it when I get back to the cold of Utah where It I will need it more starts fine in Socal without it..
Basically I want the car to run on just the set screw on the throttle and the built in idle control screw for now . so far the car will run and not cut off when throttle closes suddenly
Did the maiden shakedown tuning run a 750 mile road trip from Utah to San Diego from 5,050 ft down to 390 ft had some struggles in the beginning but after doing some side of the highway troubleshooting at 3 am found one injector disconnected 'cause the 30+ yr old wires broke right where I spliced in the new injector plug (Porsche Harness must go) so I was chasing my tail to get the right AFR and VE tables but after sorting that out and deciding to add Apha-N to the ignition load table wow it was a different car, the car would accelerate going up hill without downshifting, for the most part after getting up to speed it was like driving an automatic going from 60 to 80 mph to pass someone or to climb all but the steepest grades was just a push of the throttle now if I could just get the cruise control to work when I want it... Will prob try to add Percent Baro correction to the secondary fuel load tuning on the way back right now I am tuning for it to run a lil rich, when I get the VE maps where I like it I will change the AFR tables to lean it out so if I loose the O2 sensor I won't burn the motor up I did that befor with my first Porsche I owned a '80 924 turbo lost the O2 sensor and I had raised the boost and it melted the Alu head and pistons the seats actually fell out of the head.....

Thinking of having it dyno tuned work out a couple ruff spots and do side by side of the Focus 9 tech DME and the megasquirt also playing around with injector dead time since I can't find a spec for my injectors at 13v. plus it is working at a lower fuel pressure so the injector opens faster, Already thinking ahead of adding and adjustable fuel pressure regulator and maybe a custom ram air airbox under the front header panel like the 924 turbo...

Borisg

Hi michael,
great thread / build!
the download url to the msq file is not available. Is it possible get a new link to download the file?
(goldberg.boris@gmail.com)
I’m in the process of microsquirting my 83 944. It will be great to have a good valid staring base for tuning..

thanks! Boris.

odonnell

Adding my current tune. I heard a little bit of pinging on a hot day the last time I wound it up, so you may want to take 1-2deg of timing out across the board. May have been the gas in my tank not being the octane it claimed... first I had heard it. My cam is also advanced 4deg with a key.

catskill_t

I am reviewing this thread, I am considering doing an MS setup on a track only 944. What did you do for a coil? are you using the stock one and if so how are you driving/triggering it? also where and how did you mount the crank sensor?
thanks for sharing

Dwizle

I'm using the stock coil driven by an ISL9V3040P3 Transistor ( https://www.onsemi.com/pdf/datasheet/isl9v3040p3-d.pdf )
I am using a stock S2 flywheel it bolts right up it a 60 -2 tooth setup it had a front mount 32 -1 gave a lot of issues still using a stock bosch
VR sensor .
My setup now is totally different I will post a separate update on that.

Dwizle

Update of my current setup after 6yrs

My current setups
1: Megasquirtpnp gen2 p8791 for 87-91 944s-s2
https://www.diyautotune.com/product/...sche-944-s-s2/
Modified to run stock coil with a ISL9V3040P3 Transistor ( https://www.onsemi.com/pdf/datasheet/isl9v3040p3-d.pdf )
S flywheel using NA clutch n pressure plate and bell housing
S engine harness
Injectors: Bosch 0280155868 brown tops 4-HOLE DISC - Ultimate Atomization High-impedance/high-resistance/14.0 Ohms
TPS Sensor 944 Turbo
CLT Sensor 944
IAT Sensor GM
Wide Band O2 Sensor Controller Spartan 2 OEM from 14Point7 http://www.14point7.com/products/spartan-2-oem
O2 Sensor Bosch LSU 4.9 Wideband O2 Sensor
Idle Control Valve Bosch 2 wire Idle Control Valve from a Volvo p/n GEGT7610-324

2: MS3Pro Module with a custom design interface board for 944s-s2 Harness running a 88 Turbo motor
S flywheel using NA clutch n pressure plate and bell housing
S engine harness with modifications
Injectors: Bosch 0280150558 = Ford M-9593-F302 rated at 42 lb green tops 4-HOLE DISC for Better Atomization High-impedance/high-resistance/14.0 Ohms
TPS Sensor 944 Turbo
CLT Sensor 944
IAT Sensor GM mounted 4in from throttle body
Wide Band O2 Sensor Controller Spartan 2 OEM from 14Point7 http://www.14point7.com/products/spartan-2-oem
O2 Sensor Bosch LSU 4.9 Wideband O2 Sensor mounted in down pipe aft of turbo
Idle Control Valve Bosch 2 wire Idle Control Valve from a Volvo p/n GEGT7610-324
the wire from the vent valve used to drive the stock cyclic valve
The interface board is a work in progress
MS3Pro Module can run sequential injector coil on plug but running batch fire right now until I figure out how to get
a cam sensor mounted.
Megasquirtpnp gen2 p8791 for 87-91 944s-s2 can also run the turbo motor
Thanks again Odonnell n Dougs951S

catskill_t

thanks for the information. I have a 2.7 motor installed in a 83 track car. I am not sure now that I have installed the motor what flywheel I installed. I got boxes of parts and an engine on a pallet. is there an easy way to tell what flywheel I might have?
Can you point me or tell me the details about wiring up the transistor? The Megasquirtpnp gen2 box you got works only on the 1987+ cars because? (the flywheel + sensor quality and the TPS on those cars?).

walfreyydo

I am planning on doing the DIYAutotune PnP Megasquirt setup this spring on my S2 as well. Great thread and appreciate the data and insights. This will help my own implementation tremendously!

walfreyydo

The DIYAutotune setup is only usable on 16V cars - although you can still go the universal MS route (not plug and play):

https://www.diyautotune.com/product/...sche-944-s-s2/


The plug and play kit continues to use the stock engine harness wiring and DME plug and you just swap the DME for the MS ECU which plugs directly into the stock plug/wiring. On the 8V cars this is all different and its likely going to be easier to do the universal MS route for an 8V car. However going this route would require you to re-wire everything on the engine harness side - ie: reconnect everything from the MS system to the engine sensors. The standard/universal MS setup will have like 8ft of all the wires needed for each sensor input needed for MS that you would have to run and crimp/solder to each sensor on the engine side or re-use existing wiring and re-pin into the MS harness. There is a good guide on this on these forums called A Practical Guide to Megasquirting your 944 which may better guide you on setting up MS on the 8V cars.

There are numerous differences between the 16V cars and 8V cars. The whole engine side wiring harness, DME plug and pinouts are different. They have a different flywheel with a different number of crank sensor pickup points (?). The 16V cars only have one crank sensor (reference sensor) vs the 8V cars which have a speed and a reference sensor (2 sensors). Ignition system is also different with the 16V cars having a ignition control module where the 8V cars dont.

catskill_t

thanks, I have read the post you referenced (Practical Guide...) it is helpful. I have a 1989 2.7 8v engine with what looks like a stock wiring harness, so I guess the MS Plug and Play is only for the 16V 1987 to 1991 944 S & S2, excluding the 1989 2.7. Oh well. I have recently started the car and got it to idle on a 85.5 DME with a unknown chip(not sure what car the DME came from, probably a 2.5 8V) Due to weather I have not been able to test drive this car. I going to bet it will not run well with the DME due to the mismatch chip (2.5 maps). Anybody have a 2.7 DME chip laying around? Anyway I starting to try to figure out the parts I will need to MS it. I plan to to keep much of the stock engine harness and use another older non working 944 DME's box to house the MS and interface the DME male harness plug to the MS. how does that sound? i know i need to get a crank wheel and sensor, a turbo TPS, IAT sensor, and modify the stock coil. I just need to figure out the easiest and least costly way to do it. I hope Dizwle can share how to use the stock coil with the transistor mod.

Dwizle

I works but you will need a late late 55 pin harness and the flywheel with the teeth, not the two pins sticking up. look under the car at fw if the edge closest to the front has a serrated edge and you only have one sensor on the bell housing u have the right fw.
you can get the trans from diyauto tune I will post a pic of how i installed it

Dwizle

It's not plug n play but it can be made to work by swapping the flywheel and either getting an S or S2 harness or a BMW harness its a much cleaner install than trying to mount a wheel on the front of the motor just takes a lil imagination n problem solving

walfreyydo

Probably also need to convert from a speed + reference sensor (8V cars) to just a reference sensor (16V cars)-which would be part of the wiring swap. I think the sensor bracket is the same between both 8V and 16V. Also likely have to include the ignition control module which is present on the 16V cars as well, also likely part of that wiring swap.