So I have been working on getting my MS box going in my e24 and I figured as I searched for all this stuff, I would diagram and try to add to the library while trying to get some questions answered. I think I have an okay grip on what needs to happen, but I am one of those that like things to be really clear before I turn the key. BTW – the car has run (but only for heat cycling and around the block to make sure it didn’t blow up!- no boost) with a TCD 059 Chip and Begi with 24lbs injectors. So I know it will run-
What I’m dealing with here:
1987 635CSI 5spd with 059 ECU and stock harness
*1985 M106 complete engine- rebuilt from crank up. Stk cam, headgasket and bolts- nothing too crazy
*Intake: open air element with 3in tubing to stock K27 (will be upgrading to the TCD built version when I prove this thing will run), FMIC with 2.5in piping with HKS SSQV BOV venting to atmosphere, Stock throttle body in the stock position.
*Stock M106 manifold with stock K27, TIal 38mm Waste Gate with 7lb spring venting to atmosphere currently, custom 3in exhaust with magnaflow muffler (no cats or resonators currently)
*Innovative LC-1 Wideband, boost gauge and KnockSense using stock M106 knock sensors only using for LED mounted on dash.
*Stock ignition, coil and wires (I own an MSD-6a and Blaster Coil that I have not installed yet to keep things simple)
*Walbro 255LPH inline replacement pump
*Stock FPR – I have a BEGI that I can use if the need arises –just trying to keep it simple currently.
*30lb HI injectors- Bosch 0-280-150-934
Concerning MS:
*Symtech rebuilt V3.0 running MS1 – I had them upgrade the Fiddle Circuit to accommodate the 3 wire Bosch ICV and add boost control circuit for future use (not looking to utilize that currently – just getting it going)
*E34 60/2 trigger wheel, VR Mount and VR sensor plugged into the existing harness (using stock harness and grabbing signal from ECU plug )
*TPS -STOCK 3 wire - This is where I start to stray as I only need 3 wires- and I am sorting this our currently as I know most use the multiple output e34 automatic plug for the additional wire.. but don’t you just need 5V to the unit, the potentiometer (off idle to WOT) and closed? I know there was a recent thread on this and I am sure I can find it and post the reference to it here for future info seekers.
*IAT - Open Element GM mounted relatively near the throttle body before the ICV entry. (EXTERIOR OF STOCK HARNESS)
*CTS – Stock coolant temp sensor, again using stock harness and grabbing signal from ECU plug
I was provided a baseline map when I purchased the unit from another member that had almost the exact setup- so the thought is, do some tweaking where I know the differences are and let Tuner Studio do the rest.
And just for ease of finding info- a repost from the first page-
Onto the issues at hand…
1) I know there is a 55 Pin PnP board but this requires replacing the harness- just as much work when it comes down to it.
2) I have an 8 conductor to the Throttle Body areas where I will connect the IAT (and potentially the TPS and ICV on their own harness if needed) This is why PINs 6 an 22 are not used
3) I am assuming that PIN 35 (MS PIN 28) will be my power source and all that relay hoopla in all the other wiring diagrams will not be required- same with PIN 20 (MS PIN 37) for the fueling.
4) I have the stock E34 trigger plugged into the existing harness which should allow for PINs 25 and 26 to be the positive and negative connections ( slice MS shielded cable open to show white and black wire, shield and drain wire) Now shouldn’t this drain wire be grounded? Or does it matter as it is a short run
5) I have seen in photos , in my numerous searches on this, a resistor on one of these cables (or at least I think it was one of these) as you can see from the photo, I do not have any additional hardware installed on any of the circuits…. You can also see I need help soldering! – I have resoldered my worst connections pictured and will be covering each with heat shrink.
6) I will be taking all the grounds noted on the diagram and all grounds (8,9,10,11,19) and terminating them into a distribution block that will have a dedicated 12g cable back to engine ground (and location of my wide band ground)
7) I need to hook up Tach signal to PIN 35
8) Fiddle Upgrade for ICV- I need to figure this out
9) I have been playing with my JimStim and TS to try to figure a little of this out and have somesort of idea which way to go when crisis is found.
On another note- Through SymTech (which by the way, was way above my expectations on any repair or service to my MS unit- I highly recommend them, great service and good pricing-) Recommended an offsite tuner to assist in initial startup, getting the thing to idle and just all around remote/ log in support. As I mentioned I have the baseline set up to start from- so at least I have that going for me.
I understand that I have a lot to learn concerning MS and I am trying to get it as best I can in a short amount of time. I am in the midst of taking on a new job, 7 and 1 year olds and all the other normal life issues that don’t allow any of us to spend the amount of hours necessary ALL at once to get this thing done. The motor, interior and suspension were all built 15 minutes at a time and I just want this thing to run- I’m tired of working without reward, so I apologize for the questions.