M70 V12 powered midengine car. 12 separate standing throttle bodies from Suzuki GSXR 750 -98.
Cams not decided yet but probably Dr Shrick 265. Heads ported. Flywheel button type with Tilton 2 disc clutch. 360 rotating extraktor. Renault UN1 gearbox.M70 has firing order 1-7-5-11-3-9-6-12-2-8-4-10 and is firing 2 cyl simultaneously.
My engine has originally two cranksensors 60 degrees apart (in perfect sync: one is used). Triggerwheel is 60-2 on crankshaft
Triggerwheels VR,HALL
- primary trigger is VR, 60-2 on crankshaft
- sectrig HALL
- hopefully VR,HALL is correct, verify by measurement: if you find 2 pins that measure same resistance in both directions (usually between 300 and 1500 Ohm) that is VR, otherwise HALL
V12 ignout 1 VEMS ECU is perfectly enough for this V12
- "IGBT: 6 +2 logiclevel" as ordered:
- servicing with 4 PFETs in a special arrangement: 2 on ign and 2 on p259
2 cyl fire simultaneously. 6 ignouts for 12 ignition transformers (or 6*2 wasted spark) would be easy for passive coils, but active coils was requested:
the logiclevel i259 output can drive 2 coils/output with logiclevel inputs
- but only one COP/output if the active coil input is low impedance for some reason (as many VAG COPs; we don't know the actual COP but let's assume it's the worse kind)
Of course 4 stepper + 8 logiclevel (0 IGBT) would be an option (ign dualout is correct for this setup => each cyl fires only once / camrot => engine is like two I6 engines ) but there is a better option to drive 2 active COPs / output (even the nasty type COPs); with more power outputs left for extras or spare:
- (8 COPs driven from) 4 stepper outputs
- (4 COPs driven from) 2 PFETs on EC36/11,12 , (2 COPs per output)
total 2*6=12 active COPs can be serviced without igndualout configuration.
- Other 2 PFETs on p259 (these are not related to ignition, but can be used for relays, VVTI or boost, although this engine does not have)
WBO2 : Dual LSU4.9 (ordered one, adding 2nd for no extra charge; using flying loom connector for extra inputs anyway)
What do I win by using two LSU4.9?
- the same as using V12 ... it is fun
- normally the 2 LSU4 sensors show the same. However, if there is a problem, it can indicate (and early indication is valuable for V12 engines). Yes, individual power can also indicate many things.
- but here, because of the flying loom connector (present anyway), even with 2nd WBO2 there are plenty of analog inputs (and 1 WBO2 can be configured; just remove any unused WBO2 from the exhaust to prevent carbon deposit and sensor failure; and plug it).
In general it is a good idea to have a good match for the engine (eg dual WBO2 for a V12, 2 EGT inputs, and properly selected secondary trigger), even if just one is planned to be used initially.
IAC
The ITB-s and IAC will need to be tuned carefully.
Small "vacuum join from the ITB's" help even out vacuum at low loadsites, and have no downside (or any effect) at high power at all.