Randomly running rich under boost
06-08-2020, 01:19 PM
#21
Retired Mech Design Engr
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My thoughts. Not seeing the Log from the street tuning session, it is not possible to make a comparison.
1) Not aggressive enough EGO "P". No instant correction. Possibly not enough "I" either. It does not have enough time to make a correction before you change the working point. So, you have 20% authority, but are using very little of it.
2) Not aggressive enough MAT temp correction. Really that should be #1. Your base is 100% at 86*F. so at 122*F, I would expect the correction to be 95-96%. Your's is 98.6. There is a lot of the issue.
3) Unrelated to your rich in boost: I notice you have Long Term Trim turned on. If you know what you are doing, then fine. I don't know of anyone using it on a Miata. It seems rather complex to me.
4) And, you may just need more VEAL time.
5) Unrelated to your rich in boost: Your timing map is ultraconservative assuming stock 9.0:1 CR pistons.
1) Not aggressive enough EGO "P". No instant correction. Possibly not enough "I" either. It does not have enough time to make a correction before you change the working point. So, you have 20% authority, but are using very little of it.
2) Not aggressive enough MAT temp correction. Really that should be #1. Your base is 100% at 86*F. so at 122*F, I would expect the correction to be 95-96%. Your's is 98.6. There is a lot of the issue.
3) Unrelated to your rich in boost: I notice you have Long Term Trim turned on. If you know what you are doing, then fine. I don't know of anyone using it on a Miata. It seems rather complex to me.
4) And, you may just need more VEAL time.
5) Unrelated to your rich in boost: Your timing map is ultraconservative assuming stock 9.0:1 CR pistons.
Make all changes at your own risk. This is just for reference. On the MAT, you have to adjust for where you are at 100%. I'm at 100% at 70F as that is where I typically tune.
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06-17-2020, 07:55 AM
#23
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Join Date: Apr 2019
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Things change sometimes from FW to FW. Here is my tune when running 1.5.1 on MS3 Basic. You can see what I found to work on my car. The settings will not be universal, but should give you some feel. If you wish to have a conservative advance, then you could take mine and take off 2-3 degrees. I think you will still be 2-3 more advanced than you are now.
Make all changes at your own risk. This is just for reference. On the MAT, you have to adjust for where you are at 100%. I'm at 100% at 70F as that is where I typically tune.
Make all changes at your own risk. This is just for reference. On the MAT, you have to adjust for where you are at 100%. I'm at 100% at 70F as that is where I typically tune.
I attempted to do more veal and had it on the very easy and then easy setting and it didnt seem to change much. The values updated and pulled fuel but the car still would run straight to 10.0 with ego correction off. I still think there is something going on with the car. Not sure if its a weak coil, weak fpr running a couple psi more pressure then when originally tuning, or possible turbo problems? The turbo spools up and holds the 10 psi after a 11ish psi spike pretty instantly.
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07-20-2021, 11:01 AM
#24
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Well a year later the car seems to be sorted. The oem fuel pressure regulator was causing inconsistencies in the tune and it could never get dialed in. Replaced it with an aftermarket unit and the VE table is now getting dialed in much closer to desired values after just one session and keeping the car happy. Let hope for continued consistency.
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