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
   • Ignition Rotor delete
10. Ignition, Clewett 944 cam sync - http://www.clewett.com/index.php?main_page=product_info&cPath=59&products_id=306
11. VEMS ECU (Bosh DME delete). (specs below soon)
12. New engine harness
13. Oil pressure: 5V. Honeywell oil pressure transducer
14. 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 - idling just fine.

• Fuel

• Pressure OK. Pump runs, 3 bar read fromn gauge

• Ignition

• Sparks fine, stobed, cam wheel and crank. on the money.

• Batt low while cranking, as low as 8.8V,

• VEMS report share:

• http://vems.hu/vemstune/sharingcenter/reports.php?cmd=view&key=v4prNn

• Update 10. sep 2018

• Strugled with to hot headers. Spent a lot of time with ign timing, and air/vacuum leak, but found out (with help from KRB) that it could be the cam timing. Replaced the variable cam wheel, with stock, and problem solved. (Need to learn more about cam/valve timing). Ready to be mapped. :)

Document last modified 2018-09-10 15:54:59

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