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Megasquirting a 95' 850 turbo


voLvO tWeaKeR
Feb 22, 2008
Kingsport, Tennessee
Here we go..

Just starting on the engine.. notice the eliminated distributor.
<a href="http://s132.photobucket.com/albums/q1/lclark96/?action=view&current=100_1527.jpg" target="_blank"><img src="http://i132.photobucket.com/albums/q1/lclark96/100_1527.jpg" border="0" alt="850"></a>

side view
<a href="http://s132.photobucket.com/albums/q1/lclark96/?action=view&current=100_1528.jpg" target="_blank"><img src="http://i132.photobucket.com/albums/q1/lclark96/100_1528.jpg" border="0" alt="850 side view"></a>

Ok, So

I bought this non running JEWEL in jersey off ebay and hauled him back to tennessee. (His name is Tony Soprano by the way i figured hes from

jersey and a gangsta in disquise too :)) Anyway he needed an engine. -Maybe too many of those Cohibas! The engine when I bought it had

thrown a rod through the engine block... So I put in an engine out of another 850t that had been totaled. Engine still ran great after the wreck.

Long story short, After getting the motor in and everything back together, I wasnt getting any fuel injector pulse or ignition coil pulse.. (i had a

another thread asking questions on here) Per factory blue books I went through the whole harness, ignition troubleshooting procedures,

everything checks out fine. -Nothing but heartache! So.. after never getting lucky on getting it to start.. ( BTW Its a volvo shop) and I swapped

out ALOT of parts from customers cars, ECU's, injector relays, wires, kitchen sink.. u get the idea.. But Same problem.. I'm thinking its a ground

issue somewhere maybe after all since I went through all the + side. Sooooo I'm going to redo all the factory grounds as I'm megasquirting this car

because they are very crucial to this EMS... :-P I'm grabbing a cold drink :cheers: and I'm gonna see what happens. @ this point i'm not

accepting defeat. Lets :whip: whip this badboy back into line. I know how hard headed jersey ****ers are! :lol: hopefully i'll show him how we do

it down hurrr in the souf..... :censored: Pour me up some sizzurp its gonna be a long ride...
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<a href="http://s132.photobucket.com/albums/q1/lclark96/?action=view&current=100_1529.jpg" target="_blank"><img src="http://i132.photobucket.com/albums/q1/lclark96/100_1529.jpg" border="0" alt="starting out modding engine"></a>

today I started eliminating things like evap controller, egr, factory wastegate controller, etc..

closeup of omitted distributor i used a junk cam sensor to cover the hole:
<a href="http://s132.photobucket.com/albums/q1/lclark96/?action=view&current=100_1530.jpg" target="_blank"><img src="http://i132.photobucket.com/albums/q1/lclark96/100_1530.jpg" border="0" alt="side view of eliminated distributor"></a>

Got the factory harness where I could start to tap into it. -Will have pics of that tomorrow. I

plan on mocking up the car 1st to see if i can get it to idle, then I will Make it pretty and

permanent. seems like i can probably mount the relay board near where the motronic

computer was that way there is ez access to the factory wires. I plan on mounting the MS

ecu somewhere on the passenger side under the dash so I can have more slack on the relay

board harness.. (its a little shorter than I would have wanted but I think it will reach ok) All

my equipment came from DIYautotune.com. Matt helped me out alot and hes a really nice


I did end up getting the Gm boost controller mounted and ran new vacuum line to the

wastegate actuator. you will be able to see the pic tomorrow. BTW: Karl Buchka has been

helping me tremendously so I want to give him big props for that. (you da man karl) check

out his 242 if you havent already!

I'm going to be installing a innovate motorsports LC-1 wideband 02 sensor also for input to

the ms. Should make tuning very nice! I like the logworks3 software also that they have.

Very customizable gauges, etc and it looks clean.
Inside the car:
<a href="http://s132.photobucket.com/albums/q1/lclark96/?action=view&current=100_1531.jpg" target="_blank"><img src="http://i132.photobucket.com/albums/q1/lclark96/100_1531.jpg" border="0" alt="850 interior"></a>

I've pulled the gauge cluster. I eliminated the trip/info computer from the gauge

cluster since it would be useless anyway. MS will have all the data I need. Anyway I replaced

it with a clock. I plan on changing the dashpad soon, (mines kind of faded) so i'll put the

cluster back in when I replace that. An IPD 3 gauge pillar pod will be here soon and that will

haus the OBX AFR, coolant temp, and boost gauges. Center console will house a autometer

phantom transmission temp gauge also. A Fluidyne transmission cooler will be added at the

same time. -those 2 will be later down the road though (cooler, trans gauge).
Hi man, I like your project :)
The car looks nice!

Have you seen the LcDash (I believe they feature it where you bought the ms ?)
here's the megasquirt part... <a href="http://s297.photobucket.com/albums/mm214/Volvo_Tn/?action=view&current=100_1617.jpg" target="_blank"><img src="http://i297.photobucket.com/albums/mm214/Volvo_Tn/100_1617.jpg" border="0" alt="Photobucket"></a> shown with the relay board.. heres a relay board close up picture.. <a href="http://s297.photobucket.com/albums/mm214/Volvo_Tn/?action=view&current=100_1618.jpg" target="_blank"><img src="http://i297.photobucket.com/albums/mm214/Volvo_Tn/100_1618.jpg" border="0" alt="Photobucket"></a> or two <a href="http://s297.photobucket.com/albums/mm214/Volvo_Tn/?action=view&current=100_1619.jpg" target="_blank"><img src="http://i297.photobucket.com/albums/mm214/Volvo_Tn/100_1619.jpg" border="0" alt="Photobucket"></a>

stay tuned.. will be more pictures.....
heres a closeup of the factory motronic box taken apart with all the harnesses seperated and ready to start tapping into....
<a href="http://s297.photobucket.com/albums/mm214/Volvo_Tn/?action=view&current=100_1544.jpg" target="_blank"><img src="http://i297.photobucket.com/albums/mm214/Volvo_Tn/100_1544.jpg" border="0" alt="Photobucket"></a>

these are the only two connectors we need to be concerned with right now.. the other two are the transmission computer harness..

we will leave that alone!
Here's where I chose to mount the Gm boost control solenoid. Its near where the old factory coil was mounted on the strut tower. After reading another thread about the solenoid on this site I will go back and isolate the noid with a grommet or rubber to keep it from "clicking" when its idling.


The gm unit runs at just over 19 mhz (19.2 i believe is exact)and is alot faster at controlling boost than the factory one especially. Its also faster than alot of other aftermarket bc's..
Here's where I chose to locate the GM IAT sensor. I drilled a hole just big enough to thread it into the plastic, then cleaned everything real good with brake cleaner and JB welded it to seal it off more than hold it.

Worked really well...

Pic of all the sensors wires I need. They're twisted together right now by sensor so its a LITTLE less confusing..


Here's the big scribbled schematic....

Here I am diggin' for fuel pump wires.. I just pulled the FP relay and put the meter on it to see which one had 12+ and negative.. Then I pushed yellow male spade connectors (they fit tightest) into the socket so I could get 12 volts to the ms fuel pump output..


-I know you love the beer police shirt lol
...........Ta Da........ The Relay board is mounted........

I got it as close as possible to the coolant reservoir so I could have as much slack on the ECU to relay board harness.. ( kinda shorter than I would like) but Ill make it work just fine..

Here's another angle.. The trans 'puter will be modified to be mounted beside of the relay board.. I've got a cool idea I think you guys will like with that..

They're just laying there waiting to be hooked up but...

Thanks to my friend Brad my Ignition outputs are now soldered to the db15 connector (hes the man with a soldering iron) and thanks to my wife for baiding the wires to keep them neatly organized!


I'll get a closeup of the connector later when I get to wiring the packs up....
I cut the factory wiring harness cover off just behind where it bends to give me some extra slack for the wires..


Somewhere up in here will house the megasquirt ecu.. Gonna be a big slotted hole in the firewall for that connector!