Just had a quick look at the link on my phone as can't access PB in work.
Does look very laggy, and the boost control isn't great. The N75 graph looks horrid, up and down with a nasty boost spike between 3.5 and 3.8k. More could be done with the N75 to get the boost in sooner too.
Actuator rod looks to be slightly too long but hard to say without knowing what's going on with the fuelling and the rest of the map
What exhaust do you have? No smoke at all, especially on a poor spooling turbo, is a good indication that you dont have enough fuel in there. Can't say for sure as i haven't seen the fuelling side
Can you repeat the log you've done, exactly the same way, but log fuelling (008 and theres one other for start of injection and injection duration).
Sounds like now would be a good time to send these logs to the guy mapping it and get an updated map too?
Dan,
Thanks for that.
What would normally cause duty cycle to fluctuate so much? Just one day it started doing this and hasn't been the same since no matter how the actuator arm is adjusted.
Should it not start from 25% ish and rise to 70-80% at around 4000 rpm? Mine as you can see does not increase in this normal way, any ideas why N75 would go up and down on it's way up the rev range?
As for the lag I'm going to attack the stop screw again as there's probably some more adjustment on that, currently at 192 so perhaps make it just past 200-215?
I have standard downpipe, cut has been cut out and replaced with straight pipe and a aftermarket muffler at the back.
I'll ask John for another map but didn't want to waste his time if something is mechanically incorrect still.
I shortened the actuator so that it hits the stop at 18hg but think that might be too far (more overboost), please see below.
http://i1181.photobucket.com/albums/x439/DLSPS2011/actuator18hg_zpsa3fe3f8e.png~original
Thanks,
S10EAT
Duty cycle is caused by the N75 map being out, totally out, and the ECU having to step in once boost control deviates too much from what it wants and is expecting to see by following the N75 map
It will start from 25%, or even 20% at very low rpm, by 2K RPM its normal for it to be in the 40's, or 50's, even higher on a quick spooling turbo. It all depends on the setup - every one is different. It should hit around 75-80% at 4000 once we have enough fuel going through. The more fuel you add the more N75 you will need.
Stop screw is fine, don't adjust it any further
So your exhaust should flow fairly well aside from the restrictive downpipe. No black smoke means nowhere near enough fuel
You definitely need a new map. I really dont like how the map is done, not using the MAF sensor for fuelling at all, all reliant on the Torque Limiter which doesnt take in to account the actual airflow. Different way of tuning i guess.
Did you not log the other fuelling i requested? The one that shows injection duration and start of injection? To be honest without seeing how the map is calibrated, the 008 log isn't that helpful, all it displays is what it 'thinks' it is injecting, based on the mpa your tuner has written
Don't touch the actuator any further, you really need to work on the map that's on there in my honest opinion, it look's to be a long way off