TD_D mod journey. From stock to the 'bastardmobile'

[Td_d]

So basically log boost and IDC, and start getting an idea of what IDCs I'm hitting once relative manifold pressure goes positive?

Never mind the AFRs, I was cleaning up the MAF after sorting out the EVC, but it looks like boost is really ramping up in the early to mid 3000's:

As you can see, boost is building up much quicker now.

 

[Td_d]

Car is definitely more responsive now with the EVC working, driving with a target boost of 1.4bar, driving strong and smooth.

So, doing some more research, apparently you can splice the analogue signal from a wideband (I'm hoping the MTX-l has an analogue signal...) to pin 8 on the tactrix, which is 'free', and in doing so (with the proper code in the logcfg.txt file) get wideband logging with CAN logs! That would be awesome for open loop logging, which I've obviously had to do with a laptop - SSM resolution is much lower.

Can't wait for injectors and MAP sensor to arrive, it's had a bit of a detour, USPS for the lose (don't ask).

 

[Td_d]

Hmmm... I could kill two birds with one stone here. In order not to have to splice straight into the ECU harness, which I don't want to, I think I'll buy an OBD 2 extension cord, which I've been thinking of doing in any case (I worry about the longevity of the ECU harness with the amount of logging and ECU reflashes I do), and splice into that.

And yes, MTX-l has analogue outputs, easy peasy.

 

[Td_d]

If I may say so myself, that's really not a shoddy load compensation profile:

 

[HolyCrapItsFast]

Holy crap that's really nice. :tup:

 

[Td_d]

I'm not half obsessive, or anything :tard:

 

[Td_d]

Oh - almost forgot to post this - saw this at the mechanic's when I swung past the other day - should use this as a "how not to tune" model picture:

 

[HolyCrapItsFast]

Jesus I saw this with out reading it and thought you blew your motor... phew

 

[Td_d]

Hehehehe... no, not me - I'm paying attention - unlike whoever the poor bastard who owns that motor did!

 

[Td_d]

Ok, something weird. Reading through the tuning manual, I realised (always wondered about this) that I had stock values in the closed loop fueling compensation tables (which would also explain some of the lumpiness originally). So - I zeroed the table, basically allowing the ECU to use the open loop fueling targets only. Now this should not keep the car permanently in open loop as long as the "minimum active primary open loop enrichment" variable is an an AFR lower than stoich (and basically where you want the map to kick into open loop). Now mine is set at 14 AFR, so I should definately be in CL through the low end of the map.

Car ran fantastically smooth, btw. Opened up the logs to with an aim to see whether it impacted on MAP load compensation - car was in open loop permanently. Why? I gather it's not a good idea to run it in open loop permanently (did a manual calculation of AFR errors, thankfully the margin of error was not horrendous). Why would it do that? Theoretically it shouldn't?

I think I might put in -0.001 in the whole table - maybe a quirk of the '08 that it needs at least a value in there?

 

[HolyCrapItsFast]

That's weired. Even though I zero my table It still runs in closed loop. Don't know why your's would not. The only thing that table really does is define your closed loop targets and it references the open loop table. By zeroing out the table it just sets the closed loop targets to be the same.

I did, however, read in some of the COBB documentation that making these numbers richer than stock values could cause the car to run open loop. I just never observed that till now.

You mention that your AFR's are set to 14 in the low end of the map? Why not 14.7 This could be the issue. For cruise and idle and in the low load/rpm range it should always be 14.7

 

[Td_d]

Nah - the threshold 'kick in' for open loop (minimum active open loop fueling) is 14 - i.e. if the combined fuel map hits 14 - click, open loop.

I was right - set the whole table to -0.001 - and bam - CL switch = 8 comes back on.

I think I have an idea why - the "Minimum primary open loop enrichment (Throttle)" table is set to 14.7 (stock roms as well). So the value needs to be lower than this value too - and in zeroing the table, it is at 14.7. So with the -0.001 it is at 14.699, hence not triggering that. Make sense?

 

[HolyCrapItsFast]

Nah - the threshold 'kick in' for open loop (minimum active open loop fueling) is 14 - i.e. if the combined fuel map hits 14 - click, open loop.

I was right - set the whole table to -0.001 - and bam - CL switch = 8 comes back on.

I think I have an idea why - the "Minimum primary open loop enrichment (Throttle)" table is set to 14.7 (stock roms as well). So the value needs to be lower than this value too - and in zeroing the table, it is at 14.7. So with the -0.001 it is at 14.699, hence not triggering that. Make sense?

Give it a try. :lol:

 

[Td_d]

Yup - worked perfectly!

 

[HolyCrapItsFast]

Wow. I have learned something to day! That is going into the guide.

 

[Td_d]

Chuckle...

Yup - car's driving so smooth now with the map transitions gone! Just need to clean up MAF and load comps on the low end now, and then wait patiently for the injectors

 

[HolyCrapItsFast]

Just so I'm clear you lowered the values in the Primary Open Loop Fueling min Enrichment (TPS) table to what then?

 

[Td_d]

Didn't touch that table actually - left it at the stock 14 AFR. What I did was 'zeroed' at -0.001 the closed loop compensation tables A & B.

 

[Td_d]

Oh - sorry, didn't read thoroughly, on the Throttle table, also left the values stock - at 14.7. Only changed the closed loop fueling compensation (load) A and B tables - 'zeroed' at -0.001

 

[HolyCrapItsFast]

Oh I gotcha.