12 F150 Not Making Much Boost at WOT and BOV Acting Crazy Part Throttle

[SmallTownRacing]

I've been chasing my tail with this truck for a couple weeks and can't seem to resolve what is causing the BOV to rapidly open and close anywhere from 3-8 times before actually staying closed. I've looked for anything in the log to see if there was a limit that I was hitting or a source that was changing and have been coming up empty handed. I also am having trouble getting it to hold boost at WOT. Sometimes it will hold at 13psi and other times it will pull all the way down to 7-8psi. The current tune and a couple logs will be posted below. The truck has a brand new engine, 58mm turbos, and a larger intercooler. Running 93 octane for fuel and everything else on the vehicle is stock.

tune 10.hpt

22-12-14 17-14-51.hpl

22-12-14 16-03-05.hpl

22-12-14 08-09-25.hpl

[reubone]

tune 10 try.hpt
f150.Channels.xml
Try logging these channels. It looks like your truck doesn't know how to deal with it's part throttle boost. These turbo's must be very responsive. I would start here. Using these channels if they log cleanly and retest

[SmallTownRacing]

tune 10 try.hpt
f150.Channels.xml
Try logging these channels. It looks like your truck doesn't know how to deal with it's part throttle boost. These turbo's must be very responsive. I would start here. Using these channels if they log cleanly and retest

The BOV is still pulsating but definitely no where near as bad, I'm wondering if maybe the BOV may have just been bad out of the box? Here are two logs using that tune. One driving through the neighborhood and the other has a WOT pull in it. I can see some of the changes you had made, was it something I was overlooking with the pedal to throttle relationship or the driver demand tables that were causing it to act up? I kept raising limits to try to keep from hitting limiters but it seems like I overshot things based on your changes on a few of the tables

22-12-16 12-57-15.hpl

22-12-16 13-00-45.hpl

[reubone]

From what it looked like, your wastegate duty cycle and throttle angle were both fluctuating very quickly to try and contain the part throttle boost surge. The changes I made were in an attempt to smooth things out even at the cost of over all boost pressure. This way in conjunction with the added channels we can see what is causing the issue. I believe your bov is just reacting to the throttle closures

[reubone]

What gate spring do you have installed?

[SmallTownRacing]

What gate spring do you have installed?

To my understanding these turbos still utilize the factory spring, they are the garrett powermax stage 1 twin turbo upgrade 58mm turbos. I looked through the information on the website as well to see if the spring rate had changed but it doesn't have anything claiming that they changed. I haven't pulled the spring out to verify though. I guess I overshot some of the tables trying to keep the sources from hitting any limiters

[reubone]

tune 11 try.hpt

[reubone]

The desired break tq capped on that log at 40ftlbs. I associated that cap with this setting. As you can see it has been bumped to 800ftlbs so use caution until you get a feel for what that is going to do. In tune 10 try is was set to 400ftlbs
Screenshot (75).jpg

[Seishuku]

Add "wastegate control source" and "wastegate I-term source" to your logging channels, those will tell you if the BPV is being commanded to open, also will tell what's driving the wastegate.

[SmallTownRacing]

The desired break tq capped on that log at 40ftlbs. I associated that cap with this setting. As you can see it has been bumped to 800ftlbs so use caution until you get a feel for what that is going to do. In tune 10 try is was set to 400ftlbs
Screenshot (75).jpg

I gotcha, so thats where the combustion stability was coming back into the source from. I'll try the changes and see what that ends up achieving!

[SmallTownRacing]

tune 11 try.hpt

I did a pull with this one and hit a cylinder pressure limit so I upped everything in the higher rows to around 10 degrees and made the pull you will see towards the end of the log here

22-12-16 16-26-07.hpl

This next log was specifically from the tune revision that you had sent

22-12-16 16-15-58.hpl

[SmallTownRacing]

Add "wastegate control source" and "wastegate I-term source" to your logging channels, those will tell you if the BPV is being commanded to open, also will tell what's driving the wastegate.

Unfortunately neither one of those are options on this vehicle, I repolled just to make sure but I can't find either one of those

[reubone]

Excellent, ok so upping the comb stability max tq from 400 to 800 allowed requested tq to hit the driver demand table max around 550 or so. so thats progress. The changes you made saw an increase in reported engine break tq and a little steadier throttle blade action. so your on the right track now to getting smooth wot. Problem now is your having something drive down requested torque above 4700 rpm. takes a nose dive. can you add cat temp? Ill have to dig around some more to see If I can align the issue but it will be tomorrow.

[reubone]

tune 12 try.hpt

[Seishuku]

Unfortunately neither one of those are options on this vehicle, I repolled just to make sure but I can't find either one of those

Huh, that's rather surprising.

[SmallTownRacing]

Excellent, ok so upping the comb stability max tq from 400 to 800 allowed requested tq to hit the driver demand table max around 550 or so. so thats progress. The changes you made saw an increase in reported engine break tq and a little steadier throttle blade action. so your on the right track now to getting smooth wot. Problem now is your having something drive down requested torque above 4700 rpm. takes a nose dive. can you add cat temp? Ill have to dig around some more to see If I can align the issue but it will be tomorrow.

22-12-16 23-01-49.hpl

This should have 2 WOT pulls, one normal stabbing it and the second held in 3rd gear. This being off the last tune that I had made the changes to, not the tune 12 that you had sent. I will need to load that one in a log it tomorrow

[reubone]

Well I see that we have a code of some sort. Let's make sure that code isn't causing trouble. I also found this
anydesk00001.png
anydesk00002.png
Don't know if they are related but It is worth a shot. Change that airflow limit to 212KPA or something similar when you try the tune 12.

[SmallTownRacing]

Well I see that we have a code of some sort. Let's make sure that code isn't causing trouble. I also found this
anydesk00001.png
anydesk00002.png
Don't know if they are related but It is worth a shot. Change that airflow limit to 212KPA or something similar when you try the tune 12.

If you are talking about current DTC's it has CEL on because of hollowed out catalytic converters. Made the changes to outlet pressure, about to go test now

[SmallTownRacing]

Well I see that we have a code of some sort. Let's make sure that code isn't causing trouble. I also found this
anydesk00001.png
anydesk00002.png
Don't know if they are related but It is worth a shot. Change that airflow limit to 212KPA or something similar when you try the tune 12.

22-12-17 09-37-42.hpl

22-12-17 09-49-55.hpl

First one part throttle second one is 3 wot pulls

[reubone]

tune 13 try.hpt
Ok so it looks like something has to be off with your tq modeling. I reset a lot here back to stock to see i we have any limiters pop up.