Versatile Engine Management Systems - VEMS wiki

1986 944 Turbo race car.

Stage one goals:

1. Blocked OE intercooler
2. Turbo (garret, A/R 0.6, 3" induser, T3 housing, (from vittese stage3 i think))
3. Tial F38
4. Vario cam sprocket
5. 1-8 bar FPR, with gauge
6. Injectors DEKA 110324 850@3bar, Dynamic Flow Rate : 18.6 mg/pulse 2.5ms PW, 20 ms Period
7. Fuel rail Lindsey
8. Bosh 044 fuel pump
9. Bosh motorsport coil, 0 221 503 407, 1Kohm coil hats, 1Kohm plug hats, Bosh F7KPP332U (7A) plugs
10. VEMS ECU (Bosh DME delete). (specs below soon)
11. New engine harness
12. Oil pressure: 5V. Honeywell oil pressure transducer
13. Fuel pressure: 5V. Honeywell oil pressure transducer

Possible upgrades on stage 1

1. El. servo upgrade (mech servo pump already deleted, Opel El. pump acuired)
2. cam, Enem cam in box, dont know the grind on it, needs to be measured.
3. water/meth, have the kit, need to install
4. Metanol compliant, hoses, tank etc.

Stage 2 (future $ project)

1. race crank
2. 2.7 head
3. Steel sleves
4. Dry sump
5. complete GTR frontjob
6. chassis tubing
7. race exhaust SS321

VEMS V3 specs

1. VEMS
   • firmware: 1.2.38
   • 1-wire interface: no
   • EGT input: 1
   • ETC BridgeOutput_Interface: 1
   • Flyback: LowZ active flyback 4ch
   • Hi-side PFET outputs: 0
   • ignition driver: 4
   • Knock input channels: 2
   • LCD connection: yes
   • MAP connection: 400 kPa simplenipple
   • mounting-style: flanged case
   • primary_trigger: EC36/27 VR
   • secondary_trigger: EC36/13VR
   • Special requests: no
   • withSDcard: no ( i have SDcard in box, not mounted yet 9.juli 2018)
2. Vemstune
   • Creator: VemsTune 1.5.57 (2018-01-04)
   • Version: 1.2.38
   • SerialNumber: v3.3_u017099

Project config as of - 9 juli 2018

1. Ignition Config
   • 132+1 trugger,
   • auditrigger /11
   • Triger edge:
   • Trigger type:
   • Auditrigger divider: 11
   • TDC ATT: 80 (default from vems) this one is tricky.. <https://rennlist.com/forums/944-turbo-and-turbo-s-forum/1076617-951-vr-sensor-tdc-trigger-pulse-vs-actual-crank-tdc.html>
   • Teeth on wheel: 12
   • Teeth full engine cycle: 12
     • (missleading.. FW update?)
   • First trig tooth: 1 (5 is default from VEMS?)
   • Next trig toot: 6
   • angular with of toot: 30 (360' /12 teeth)
   • All filers+extrapulse trig: disabled
   • Reference Tooth table(cyl/tooth): 0:0,3:6,2:0,1:6
     • (this is wrong, firing order on 944 is 1342(0231) VEMS shovs 1432(0321 How do i configure this??)
2. Injector config
   • Inj size: 850CC Deka, flow 4.77ms@3bar (
   • (injector#:EC36 pin) 1:7, 2:19, 3:8, 4:20
   • inj firing order: 1,3,4,2

1. Status as of now
   • Fuel
     • Pressure OK. Pump runs, 3 bar read fromn gauge
     • Cannot hear the injectors clikking, smells a litle of gas, but not much.. hard to tell
   • Ignition
     • Sparks fine, visual, not stobed, both when cranking, and testing, but timing might be way off..
     • Batt low while cranking, as low as 8.8V,
     • Problem? Looks like VEMS resetts for a second or two eatch time i crank..
   • VEMS report share:
     • http://vems.hu/vemstune/sharingcenter/reports.php?cmd=view&key=v4prNn

Document last modified 2018-07-09 10:13:51

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