Is there an option to limit slew rate in MS/TS?
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Originally Posted by Spaceman Spiff
(Post 1601749)
Is there an option to limit slew rate in MS/TS?
Figuring out closed-loop boost sucks, hopefully its worth it. Having some warm idle issues too where it doesnt seem to catch the RPM dip if I put the clutch in too soon or let it return to idle from a rev in neutral, which is getting annoying and wasnt present when it was cooler. Once a project, always a project I guess |
DNMakinson pretty much sorted CLBC on 1.4 and higher. The secret sauce was to set the bias table much lower than the figure your pulls would indicate. Why it works better like this is a mystery to me but it works.
It is almost like it needs to be fed a larger error to predict where you need to end up. The speed of change in boost also impacts being able to plateau just at the right time. I expect that you are really building boost quickly. Version 1.5+ has the ability to log P I D in boost (among other). It is not real time, but it does really help in seeing which element needs to move which way and how your changes take effect. Search the megasquirt forum and you'll probably find the thread. The good stuff is near the end. |
Originally Posted by fwman1
(Post 1601991)
DNMakinson pretty much sorted CLBC on 1.4 and higher. The secret sauce was to set the bias table much lower than the figure your pulls would indicate. Why it works better like this is a mystery to me but it works.
It is almost like it needs to be fed a larger error to predict where you need to end up. The speed of change in boost also impacts being able to plateau just at the right time. I expect that you are really building boost quickly. Version 1.5+ has the ability to log P I D in boost (among other). It is not real time, but it does really help in seeing which element needs to move which way and how your changes take effect. Search the megasquirt forum and you'll probably find the thread. The good stuff is near the end. |
It’s a been a bit, time for an update
closed loop EBC seems to be working well — again the key with MS3 seems to be to undershoot your duty targets 1300 miles so far, couple little things came up (listed the car for sale for 8 full hours out of frustration at one point lol) An oil leak developed right at the corner of the CAS cap and valve cover, so got a new OEM mazda valve cover gasket and used even more of the black rtv and that seems to be good now but then I realized I was still losing oil… way more than I should have been like 1/2 qt per 300-400 miles and a little smoke on startup and revs. Talked to a friend who had encountered something similar with a broken PCV system and he suggested basically just venting both sides of the valve cover (both to a can with a breather really) so I figured I’d give it a shot, started it up and saw this https://cimg5.ibsrv.net/gimg/www.mia...20b9ca909f.png Puffing out the breather, hmmm — blowby from bad rings or an okay amount of blowby from rings with larger gaps to builders specifications running turbo So I pulled the plugs, each looked pretty much the same — a little dark from running rich, but all equally so none stood out So did a compression test with the cheap-o tester I had and gotCyl4 - 90/170 Cyl3 - 90/160 Cyl2 - 90/165 Cyl1 - 90/165 Well within range of each other, and the car runs well okay so probably not rings (this is when I removed the ad haha) did a couple more tests, PCV valve is definitely bad — so ordered a GTX one, and added a second catch can on the pre-turbo side of the system. I am also just going to run the intake side as a VTA after the catch can and not connected to the intake vacuum port at all and will keep an eye on my oil level… the puff at startup has gone away so I’m hopeful. Put a new set of plugs in while I was at it too https://cimg9.ibsrv.net/gimg/www.mia...5393e001c.jpeg Intake catch can VTA on the firewall, mini catch can on pre-turbo side mounted to top of radiator for now I will make those a little prettier, but for now I’m just hoping it works. Otherwise, car is running great |
not super scientific, I know, but some small changes *feel* better!
https://cimg9.ibsrv.net/gimg/www.mia...68fab9f3d.jpeg High boost canister, straight wastegate https://cimg3.ibsrv.net/gimg/www.mia...639f1a5be.jpeg Old log of medium canister (8.8psi max straight wastegate) https://cimg6.ibsrv.net/gimg/www.mia...d08cbeb2e.jpeg PTP blanket and fresh FM air filter https://cimg7.ibsrv.net/gimg/www.mia...c6f3e0ae3.jpeg With blanket, high boost canister, and fresh filter Boost really does seem to come on sooner, I attribute this more to having an appropriate spring weight for the wastegate, but did notice temps were cooler with the blanket (oil and water) still burning a little oil, thinking it’s valve stem seals on cyl2 possibly but going to run it until winter and then tear down. Smoke and oil loss is minimal after fixing pcv, car runs strong so sending it! |
FWIW I only see smoke out the breather on a dyno run at full throttle. I dont ever see anything at idle or cruise speeds/low boost part throttle. Your compression seems good so I would just send it and enjoy it. I too am ---- and OCD and let that kinda stuff bother me so I know how you feel.
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You can send in oil samples to Blackstone. So far I’ve pulled my motor twice because of them. Might be cheaper to ignore their results I guess.
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Originally Posted by curly
(Post 1605020)
You can send in oil samples to Blackstone. So far I’ve pulled my motor twice because of them. Might be cheaper to ignore their results I guess.
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^^ I am curious about this too -- what would their analysis be able to tell me? I took a look around their website, peeked at the sample report, but can you tell me a little more about what it told you about the engines you pulled? $30 is entirely reasonable at this point if it can help me narrow down why I am still puffing some smoke after idle/vacuum when I get hard on the gas... turbo seals because of inadequate drain or excessive crank pressure (or is that fine with my ring gap) or both, valve stem seals, or is there an issue with ring gap (I feel like I'm going in circles) so if an analysis could actually help narrow that down I am in
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It's best if you send in a sample every oil change, or when you're concerned about something. If your bearing materials like lead, copper, and tin are extremely high like mine, it's usually obvious you've got issues with them.
I had bearing noise and sent off a sample, although already pulled the engine and inspected bearings before I received the results. Did it again to verify the levels were going down, but they had instead gone up. Kept an eye on knock levels for ~500 miles, sent in another sample, levels were down but not amazing. Inspected the bearings again, and they were starting to show wear again. I'm done with race bearings, trying OE rod/mains now with a fresh non-ground crank. |
Some updates
car made it through the Rochester car season, never got around to e85 this year but did take some andyfloyd sauce (octane boost) and was seeing 22psi, but don't love the guesstimate of 1 octane bottle per tank. After talking with my builder and fixing a non-functioning PCV valve my oil consumption issue is under control. They hooked ya boy up with big ol ring gaps, so I do have to keep an eye on oil level but it isnt coming out the tailpipe any more so I am good with that. The (working) GTX valve helped considerably, I found that it just seems to work better with my system to keep the PCV with a catch can, and a second catch can off the other side drawing vac from pre turbo -- car is happier that way rather than venting both to atmosphere through catch cans. Car is currently on the lift for the winter with a few things on the list:
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Mine is making 460+ with ID1050x and a w460 on e85 and a 6758.
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https://cimg6.ibsrv.net/gimg/www.mia...794d0e9f0.jpeg
Cat and goodies also snagged a 3.6 from a forum member, waiting for it to ship out 👌🏼 |
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Wrapped perfectly! |
I'd be happy to buy your 4.1 torsen if you could hold it for me. I'm usually in Rochester every month or so
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Sure, DM me and we can work on a price etc -- not looking to get rich, but offsetting my 3.6 cost would be awesome
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Originally Posted by The Australian
(Post 1614046)
Mine is making 460+ with ID1050x and a w460 on e85 and a 6758.
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Originally Posted by Dr.Sep
(Post 1613995)
Some updates
car made it through the Rochester car season, never got around to e85 this year but did take some andyfloyd sauce (octane boost) and was seeing 22psi, but don't love the guesstimate of 1 octane bottle per tank. After talking with my builder and fixing a non-functioning PCV valve my oil consumption issue is under control. They hooked ya boy up with big ol ring gaps, so I do have to keep an eye on oil level but it isnt coming out the tailpipe any more so I am good with that. The (working) GTX valve helped considerably, I found that it just seems to work better with my system to keep the PCV with a catch can, and a second catch can off the other side drawing vac from pre turbo -- car is happier that way rather than venting both to atmosphere through catch cans. Car is currently on the lift for the winter with a few things on the list:
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Just some progress updates made over break, back to work tomorrow though
https://cimg6.ibsrv.net/gimg/www.mia...8406893a5.jpeg Room for activities https://cimg9.ibsrv.net/gimg/www.mia...887491880.jpeg Got the 4.1 out, still waiting for the 3.6 supposed to be here tomorrow but the tracking doesn’t seem to be updating so I really don’t know. Got new competition bushings coming and the diff braces to be welded to whatever housing is nicer https://cimg1.ibsrv.net/gimg/www.mia...6646dfa90.jpeg Got the new skunk2 TB on there. Went together MUCH better than the eBay one I junked. Don’t expect big gains here, but I like nice things 🤷🏽♂️ Also wired up launch off the top clutch switch (will run spark and fuel cut) and rewired the High/Low boost switch to be a simple on/off with the wastegate. Tried to have it boost table-switch last year to have actual low and high boost, but didn’t realize you have to “power cycle for changes to take effect” so this is on-the-fly and will run wastegate 16psi most of the time Really hoping my 3.6 comes soon (or comes at all?????) |
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