Author Topic: Individual fuel and ignition trims?  (Read 4935 times)

Offline vr-vagman

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Individual fuel and ignition trims?
« on: November 07, 2011, 12:02:47 pm »
Hello all,
it's my first post here. I'm building a VR6 turbo engine for my project car. Seems it is time to start looking for standalone so I asked Rob to let me in this forum. I want to go with OEM trigger and full seq. injection and ignition. I'll produce custom inlet and exhaust manifolds with max runner lenght compensation as possible. Anyway I think there will be still some cyl to cyl difference in fueling and spark/advance needs due to the specific VR layout. Here is why I'm interested in individual fuel and ignition trims possibility with VEMS. How these are organised, how do these look like? Are these are just constants for every cylinder's fuel/spark or are individual 3D tables so different fuel/spark advance could be added or extract just for specific rpm and load range of a single cylinder? I mean if available at all.
Also I woud like to know is traction control available, how it is working (what strategy: fuel/spark cut? boost cut, etc..) and what would be needed for RWD car?
Thanks.

Offline GintsK

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Re: Individual fuel and ignition trims?
« Reply #1 on: November 07, 2011, 03:33:15 pm »
No 3D. VEMS have additive and multiplicative correction possibility for each cylinder. Additive is for close to idle loads, multiplicative - for full load. For spark just additives for each cylinder.

Also we have no traction control in official releases. Although Russian guys seems have use it. They have adapted firmware for RWD Toyotas.
Partly it can be compensated with speed dependant launch control function and selective boost levels for each gear. Another good option for keeping traction: you can get W-gate operation under TPS control. Those guys who often race on slippery are happy with possibility to control boost with accelerator.

Gints