LeeE

Great reply - thanks again. Looks like I'm stuck with using the SPWA table even though it makes some of my fuel table look like it was tuned by a 5 year old

Thanks for that. I assume this fluctuation is because the SPWA must be a constant value but effectively becomes a variable when tuning without SPWA because the compensation included for injector non-linearity is subject to adjustment by the ECU for different operating conditions such as MAP?

I know the recommendation is to use the injector short pulse width adder table data if possible. Other than making the fuel table smoother (or lumpier in my case) are there any other benefits?

Thanks for the reply. I've been attempting to induce some knock to compare to the audio recording from a previous run that should have been a knock free run. I've tried gradually advancing the timing for map rows 80 kPa to 120 kPa to a max as per the table below. However, other than being noisier, I can not detect any other difference to the knock free recording. Would you expect the timing table below to produce knock or am I going about this the wrong way?

Thanks Adam It is a stock compression motor using 98 octane fuel. At the moment I am only trying to establish what knock/no knock sounds like for this engine, not set a threshold. Would you expect this modified map to be knock free when running a boost of 1 bar (max) given the octane level of the fuel being used?

My GTR R33 is pretty much stock. I am attempting to configure knock control and want a knock free baseline audio recording. If I retard the GTR basemap ignition table by 5 degrees and run off actuator spring pressure boost of 0.7 bar (stock is 0.8 bar) would this guarantee a knock free run, assuming the base ignition timing and fueling are OK? I have attached the GTR basemap ignition table, both default and retarded by 5 Degrees for reference. I'd appreciate any ideas or feedback. Thanks

Thanks for the quick reply Adam

Is jump starting from another 12v battery (connected in parallel) likely to cause any damage to the Link ECU? Thanks

Thanks Adam

It's on the y-axis as per my first post above:

BAP can vary by around 9kpa which is 4kpa weather and 5kpa elevation so a significant amount when only boosting to 1 Bar. You can see from the MAP Limit table that I specify the cut 10kpa above the 1 Bar limit and have a control range of 10kpa so the cut will start just after the 1bar limit. I have specified a very soft cut (which feels like the OEM limiter) with a hard cut at the end of the control range as per the attached image. My logic was that if the rev limiter is no worse than OEM it should be ok on the ceramic wheels providing I'm not constantly hitting it. Would be interested in your thoughts

Great info - thanks My situation is that until I upgrade next year my turbos are limited to 1 Bar boost (i.e MGP) as above this the ceramic wheels have a tendency to disintegrate. The engine components will take more than 1 Bar MGP comfortably. So I want to run as close to 1 Bar as possible and have the wastegate table configured with MGP as the y-axis. However I have to configure the MAP limit for cold weather which results in under boost in warm weather. I might be being overly cautious / greedy re boost but a MGP RPM limit would have been ideal. What are these other "safeties" used at Pikes Peak?

That's interesting because I'd read that MGP was a better measure of how hard a turbo is working - are you saying that's not true because if so I need to re-think my strategy anyway?

That's a shame. Is there any other way of limiting boost to allow for BAP otherwise won't I have to configure the limit artificially low to allow for cold weather temperatures?

I want to control turbo boost by MGP rather than MAP. I set up a 3D MAP Limit table as per the attached image. I was expecting the MAP limit to vary according to BAP. So if BAP is 102kpa the MAP limit would be set to 202kpa which would limit boost to my required limit of 1Bar / 100kpa MGP. However it appears that the MAP limit only increments in 5kpa steps i.e 200kpa -> 205kpa -> 210kpa. Can anyone confirm this please? Thanks