Hi, and apologies in advance for the long post – I’ve tried to condense my questions into one post.
I’ve got an LS1 powered Silvia as a track/hillclimb car – I’ve been running it for a few years and upgrading various things in the process. I’ve recently started on the various electrical and logging systems – so far I’ve installed and configured:
· MK60 ABS system
· ECUmaster PMU16
· Motec CDL3 dash (with a Motec SLM and GPS)
· Motec Lambda-to-CAN (single channel)
· CAN Checked MCE18 (CAN input module)
I’ve left the ECU to last, mostly because it works OK with the factory ECU and I’ve been able to do the rest without missing any events.
I’m leaning towards a G4x (probably an XtremeX?) – the other option is Motec, but (price aside), it seems like Link have a much more open and helpful culture.
Features like launch control and traction control are one of the key reasons, as well as being able to communicate over CAN with the rest of the hardware – it’s frustrating not having access to a lot of the ECU data. I’m also having irritating drivability issues with the OEM ECU, particularly around idle and pit-speed driving (which can probably be solved with tuning, but it’s frustrating not being able to adjust things myself)
So, preliminary questions:
· Is there significant advantage with sequential ignition, or should I consider a FuryX with the built-in Lambda?
· Does anyone have a start-up or base map for an LS1? The engine is mostly stock except for a VCM710 cam, LS7 lifters and some general cleanup and porting (with a bit of extra compression)
· Flat-shift/rev-matching (with a T56 H-pattern) – I’ve read a couple of posts on the Link forum – is there an established method to get nice results with only brake/clutch inputs, or does it really need gear-position sensors to work properly?
· Traction/launch control – how fiddly are these to implement? Is there a base set of parameters that works reasonably well?
For hardware, I’d appreciate some feedback on the below:
· Is it worth changing from a cable throttle to DBW? I like the apparent simplicity, and it seems like the smoothest way to implement TC/Launch control/Idle. If so, is an 82mm Bosch motorsport unit/bosch pedal the right choice?
· Knock sensors – any advantage to fitting Bosch motorsport sensors instead of the OEM LS1 units?
· Injectors – Is it worth upgrading to a more modern unit?
· Lambda – I’ve got the left bank with the Motec unit, is this sufficient/acceptable for closed-loop tuning?
· Temp/pressure – I was intending to monitor fuel, coolant and oil with bosch combined pressure/temp units – seem reasonable?
· Wheel speed – I have 4-wheel speed into the dash at the moment (output as a 5v squarewave by the ABS unit. 48pulses/rev) – I can transmit over CAN, or send the input straight to the ECU?
I’ll retain the OEM sensors/parts for the below, unless they should be changed?
· MAP sensor
· Intake temp sensor
· Crank/cam position
· Coils
Cheers,
-Robin