Cols300
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Posts posted by Cols300
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This is how i would set up boost control for 25 PSI. Just remember you haven't tuned the fuel/ignition cells that high and the boost DC values will need some fine tuning.
Ok, So I have adjusted the axis to show MAP.
I have added 259 and 262 in the MAP axis as yours started at 265 and my table seemed to be bigger, I have left the values in that section as zero, do I need to change them?
Do I need to add vales in the bottom 282? as they are also all zero.
My table also shows 1000 and 1500 RPM. Do I need to add values in their?
It looks like I have an opportunity for a small amount of dyno time this Saturday, so im wanting to get this as close as possible I guess because, to utilise dyno time as best as possible.
Thanks Again.
Col
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Makes it more difficult to pop around and take a look
Thanks for the thought though
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Where are you located Cols?
I'm in Vic mate, Ballarat
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So if I change that Axis to MAP, am I right in saying that my values in the table would no longer be accurate?
my table seems to be a lot bigger than yours, is there a reason for that? Is it necessary?
cheers
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How do I change it to read MAP?
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It seems to be working as expected to me. When you increase wastegate DC, the boost increases. You have more than 23psi showing in that log. So most likely, just a tune issue.
Great, thanks heaps for all your help.
Col
This is how i would set up boost control for 25 PSI. Just remember you haven't tuned the fuel/ignition cells that high and the boost DC values will need some fine tuning.
Thanks Ducie.
Can you tell me why my DC table measures MGP and your MAP?
Can you explain the difference please?
Cheers.
Col
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Sorry to be a PITA, But I have re done both logs, the first one with no adjustments to the wastegate table and the second with + 15% across the board.
And going by the gauge, it made approx. + 5PSI difference, can you confirm that with the logs? What does the before and after PSI calculate to?
I have attached both logs and both base maps before and after changing the wastegate table
Turbos are GT675RS with standard wastegates, using a 3 port valve.
I hope im on the right track?
Cheers.
Col
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Yeah it still has the original values, the lower ones.
thats why I thought I'd ask if by updating the firmware, the ECU controlled the original settings differently.
cheers.
Col
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Sorry, I could have explained myself a bit better.
The map I attached was the altered one, + 15% across the board.
Once I done that log run, I closed the software without saving it to the ECU, and it seemed to still be boosting well over the 20psi
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The log shows a max of about 24psi with it settling at 21-22. You were only at 50% throttle though so I expect that will climb with more throttle.
So if you are sure that boost has definitely increased just by increasing DC in the wastegate table then I think we can conclude that the mechanical systems, wiring and ecu is all working and capable, it is just the tune preventing you getting there.
I wouldnt be keen to go pushing things much more than that until the map is fixed up.
Thanks Mate.
Any ideas as to why is seemed to still hit higher boost after I closed the software without saving?
You mentioned in an earlier post that I originally had an old version of the firmware, and there were boost control changes in the newest version, by updating to the newest version, would that have changed how the original tune controlled boost?
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The table units is percent now, so what I meant by adding 15% is change the 40's to 55. change the 25's to 40. Obviously some of the bigger ones will top out at 100.
Dont worry about the PID's yet, just try the table.
HI Adam.
So I added the 15% into the to the wastage DC table across the board, and going by the boost gauge it most definitely went well above 20psi, maybe around 25-26 by the gauge, which I logged.
Strange thing is, I didn't save the table when I closed the software, and it still boosted well over 20psi, again around 25-26.
I didn't have time to open it up and do another log run though.
Does the log run reflect this?
Thanks Again.
Col
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Just a quick question to simplify this:
What is the minimum boost pressure that you would see if you were to bypass the boost solenoid and only run wastegate boost pressure(ie vac line straight from compressor housing to wastegate actuator)?
Typical rule of thumb is that in most systems, max attainable boost is just a bit over double wastegate spring pressure. But this can vary depending on wastegate type and plumbing.
Hi Brad.
I am not sure, as I haven't done that test, If I were to disconnect both hoses from the solenoid and join them together, is this going to give me this information?
When you say minimum boost pressure, Minimum when? as in certain RPM or cruising?
Cheers.
Col
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Not only is the afr`s crazy rich but its also TARGETING rather rich AFR`s. Your targeting 11.83 afr under load conditions i would still be inn the 14.7 area (during cruice conditions). You are also targeting 13.01 on idle. Although target is not really linked to the actual fuelmap as you can have whatever in teh taret table and still tune the main fuel map to whatever AFR you like it is good practice with this ecu to have reasonable targets and then tune to hit those... I have a feeling your milage have taken a big hit with this tune. And if you have driven it like this for some time i would probably change the oil just in case.
If this is now running as it did when leaving the tuner im going to put this in the nicest way possible.. Are there any other tuners around in your area?
Hi Steve.
Thanks for the reply.
I know when he began tuning it, he was very skeptical that the lambda's were reading correctly, as one was reading a huge difference to the other, so tuned with probes in the exhaust.
Fuel economy has actually never been better, haha, I had an old Wolf 3D in before the link, and now that was a glitchy ECU and couldn't keep a tune in it, and was extremely rich, but in saying that, I really do not do a lot of road K's in it, and fuel consumption is not a huge concern.
I changed the oil before it was on the dyno and have done a few drag runs since, it will most definitely be getting changed once this issue is sorted and back on the dyno.
I understand what your saying in regard to "are there any other tuners in my area" This guy has a great reputation, if it makes any difference, he only tuned high end, no cold start or idle or cruise etc. as we were pretty tight for time.
Cheers.
Col
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Rodger that
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Your "stutter" I suspect is just a rich misfire? If we can believe your lambda readings it is running crazy rich, you have 0.54 on one bank and 0.58 on the other in the area where it misfires.
I think your boost problem is just the Wastegate DC% table has numbers too small and you have all PID's set to zero so it is effectively doing no correction at all. Try adding about 15% to all numbers in your wastegate DC% table and do another log.
I would also suggest you do a firmware update as you are on quite an old version and there was some changes made to boost control since then.
I just want to confirm, is this the wategate DC table I need to adjust?
So when adding the 15% its as simple as example 40 + 15% so change the number to 46?
Does this need to be done to all individual cells?
And sorry for all the questions, but PID's? what that? lol and do they need to be altered?
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OK great, thanks.
I will give that a try.
Cheers.
Col
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Hey, Thanks again.
Si I disconnected the solenoid, and yes it would boost past 20psi
So I reconnected and done a log run.
What I also noticed was a stutter in 2nd gear around the 20psi holding revs approx. 5500-6000?
Hope I have uploaded the files correctly.
Cheers.
Col
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Hi Adam.
Thanks for your reply.
As far as I know, yes the ECU should have been controlling the boost.
When you say unplug the solenoid, do you mean take a hose off it, or disconnect it from the power source?
Col
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Hi All.
A quick intro, I'm Col, I have a Nissan 300zx that has very slowly been built over many years.
A few months back we finally got to tune it on a Dyno, and had some good results, but could not boost over 20PSI.
Now for myself, I know very little about tuning, very bare essentials, the guy tuning it had only ever used a LINK G4+ on 1 other occasion and was very straight up with me about this, and admitted that though he loved it as an ECU he has never had the opportunity to learn them inside and out.
Prior to it being on the dyno, a good mate of mine who helped me put the engine together, put a very basic tune in it, just so it was drivable, and we done a very small amount of road tuning to ensure it was not doing anything out of the ordinary.
So I guess the question is,
What have we missed, something in the background not letting it boost over 20PSI.
I'm sure the tuner could spend time on it and sort it out, but that's all $$ so I thought id ask the question on here.
What do you guys need to know to help push me in the right direction?
Can I upload some screenshots of the tune?
Like I said, I'm green to all this, so any input would be fantastic.
Thanks Heaps
Col
Cant reach boost target
in G4+
Posted
Thanks to everyone for their help.
ended up with some good results today.
cheers.
Col