Odd behavior when shifting

[paulwalll]

I've been having an issue with my car bogging/completely losing power for a second or two when i shift. I took some datalogs and i noticed that when i shift the afrs go max lean and there is barely any boost for those few seconds that i lose power. I cant figure out whats causing this. Can anyone tell me whats happening? Here are a few logs too look at.datalog7.csv

datalog8.csv

datalog9.csv

[funkytuqe]

This is something that mazda implemented to save the drive line and mounts. Post shift, boost is cut for a second or two before ramping up again, SUPER ANOYING! Cobb has managed to get around this and implemented a fix in the latest revision of OTS maps over the last year or so. Or you can search post shift stutter fix to fix it yourself in ATR for older version maps.

[paulwalll]

Ok, i looked through tha thread that lex made for stutter during 2-3 gear shifts and thats exactly whats happening. I have some pretty sticky tires, and making decent power so i guess my load is high when i shift. The only thing i see to adjust is the ign. timing limit from -3 to 0, but i doubt that will have much affect. Has anyone found a solution for this?

Lex
rfinkle2

[rfinkle2]

You can try the fixes in the thread below (hyperlinked to posts concerning shift folders)

SWAS - DISCONNECT ON A GEN2

[helmetface]

Originally Posted by rfinkle2 You can try the fixes in the thread below (hyperlinked to posts concerning shift folders) SWAS - DISCONNECT ON A GEN2

Looks like he's got a genWon..Dano has a how-to for that

[rfinkle2]

Originally Posted by helmetfail Looks like he's got a genWon..Dano has a how-to for that

I'm with you 100%. The tables that control the post shift fueling are in that thread, but buried in with swas info.

The thread title is definitely misleading. LOL

[Lex]

Originally Posted by paulwalll Ok, i looked through tha thread that lex made for stutter during 2-3 gear shifts and thats exactly whats happening. I have some pretty sticky tires, and making decent power so i guess my load is high when i shift. The only thing i see to adjust is the ign. timing limit from -3 to 0, but i doubt that will have much affect. Has anyone found a solution for this? Lex rfinkle2

Is this going on while turning or in a straight line? If it's a straight line SWAS wont affect it. Do a datalog and look at your AFRs when shifting. Are they going very right? Do you have an intake leak? I was just dealing with a leak that opened up when the motor rocked (shifting) causing the car to stutter.

You can pull the timing to -3 but on the MS3 this does not have as big of an impact as the MS6. I assume you're not running VTA as that will also make the car stutter.

[paulwalll]

Originally Posted by rfinkle2 I'm with you 100%. The tables that control the post shift fueling are in that thread, but buried in with swas info. The thread title is definitely misleading. LOL

The tables that were posted for the fuel comp. were the same as my ots values. My swas has been disconnected for a while now too. The only other thing i can see to do is to set the ign. timing limit min. from -3 to 0.

[rfinkle2]

Originally Posted by paulwalll The tables that were posted for the fuel comp. were the same as my ots values. My swas has been disconnected for a while now too. The only other thing i can see to do is to set the ign. timing limit min. from -3 to 0.

Does your car run -3 @ any other time that you have noticed?

I don't foresee that being a problem, but have you noticed a -3 value in any of your logs that weren't post shift?

Those tables were -13.5* from Mazda, and the -3 was a working change. I don't know that making the minimum advance 0 will fix the issue. (but may be worth a try).

AHHHH! paulwalll... try this: scratch all of the above and change your fuel commanded max enrichment allowed to 11.0.

[Lex]

Just noticed your logs. Your boost takes a while to get back up - it should not spool by 4600 RPM. This definitely looks like a leak of sorts. Check the intake piping from the filter to the throttle body.

[paulwalll]

Originally Posted by Lex Is this going on while turning or in a straight line? If it's a straight line SWAS wont affect it. Do a datalog and look at your AFRs when shifting. Are they going very right? Do you have an intake leak? I was just dealing with a leak that opened up when the motor rocked (shifting) causing the car to stutter. You can pull the timing to -3 but on the MS3 this does not have as big of an impact as the MS6. I assume you're not running VTA as that will also make the car stutter.

I have 3 logs in the first post. They were taken in a straight line 2-3 gear shift. There are no intake leaks that i know of. I did a boost leak test through the intake about two weeks ago, and everything is tight. Ill check it again though.

[rfinkle2]

My apologies Lex for barging in.

I see once in the logs the afr dips to low 9's and have had good luck with the max enrichment table keeping this from happening.

The swas on my car activates on undulating roads sometimes (surprised me too), but that thread above has some fueling post shift fixes buried in it as well.

[paulwalll]

Originally Posted by rfinkle2 Does your car run -3 @ any other time that you have noticed? I don't foresee that being a problem, but have you noticed a -3 value in any of your logs that weren't post shift? Those tables were -13.5* from Mazda, and the -3 was a working change. I don't know that making the minimum advance 0 will fix the issue. (but may be worth a try). AHHHH! paulwalll... try this: scratch all of the above and change your fuel commanded max enrichment allowed to 11.0.

Yea when i shift it hits -3*. I have the max enrichment set to 10.5. Could it be a possibility of the bpv leaking?

[rfinkle2]

Lex mentioned you were running vta and that could absolutely be making your car rich post shift.

Yes. If the BPV isn't sealing, you could see erratic afr's, especially after it actuates (if not vta).

[paulwalll]

Bpv is in full recirc.

[rfinkle2]

Originally Posted by paulwalll Bpv is in full recirc.

It absolutely could be bpv related.

I would yield to Lex though, and follow his advice. He is light years ahead of me in terms of hardware and tuning experience.

[paulwalll]

Originally Posted by rfinkle2 It absolutely could be bpv related. I would yield to Lex though, and follow his advice. He is light years ahead of me in terms of hardware and tuning experience.

Yea im going to do a boost leak test again and try to move my intake piping by hand to try and simulate my car shifting, and see if any new leaks pop up.

[Lex]

The strange thing here is that once you shift, the boost hangs around the 3-5psi mark for a while and AFRs are very lean. This is for sure associated with your issue. The boost not building (and actually dropping in log 9) is a mechanical/leak issue. The AFRs are likely related. If you shift gently does it have the same behavior? How does it spool when going from 3-4. How does it behave if you sit at 3500 RPM or 4000 and punch it in 3rd or 4th?

[paulwalll]

Originally Posted by Lex The strange thing here is that once you shift, the boost hangs around the 3-5psi mark for a while and AFRs are very lean. This is for sure associated with your issue. The boost not building (and actually dropping in log 9) is a mechanical/leak issue. The AFRs are likely related. If you shift gently does it have the same behavior? How does it spool when going from 3-4. How does it behave if you sit at 3500 RPM or 4000 and punch it in 3rd or 4th?

If i shift gently i have no problems. I can shift before 5000rpm in 2-3 hard and have no problems. There are no problems when i punch it in 3rd or 4th, it just goes. I did however had a problem with the power breaking up when i punched it in those gears before i found a few boost leaks. That problem seemed to go away after i fixed the leaks. I haven't had any issues with 3-4 gear shifts. Ill get some logs of 3-4 and see if there are any similarities.

[paulwalll]

Well i found that my occ is getting pressurized when i put the boost leak test on. The o ring seal in occ is a little worn out so it leaks air past 8 psi or so. I run a second pcv valve instead of a check valve, so i replaced that with a new one. Sill getting pressure to the occ probably air leaking past the piston rings. Would that be the cause of my issues? I found one other minute leak where the recirc hose meets the tip.

Lex
rfinkle2

[Lex]

Definitely take care of the leak at the recirc hose - that will throw things off. For the OCC, are you boosting it through the intake or crankcase? If it's through the intake you need a valve that will seal before it.

Like I mentioned I had some terrible stutter during shifting and couldn't figure it out. Turns out I had a leak between the TIP and intake and would unseat once the engine moved and BPV let off.

[paulwalll]

Originally Posted by Lex Definitely take care of the leak at the recirc hose - that will throw things off. For the OCC, are you boosting it through the intake or crankcase? If it's through the intake you need a valve that will seal before it. Like I mentioned I had some terrible stutter during shifting and couldn't figure it out. Turns out I had a leak between the TIP and intake and would unseat once the engine moved and BPV let off.

The occ is between the crannkcase and IM. I replaced the valve between The IM and occ. The recirc hose was tightened and is good now. My problem isn't so much of a stutter, its feels like my throttle is shut for a second or two after i shift fast. Logs show that the tp is open all the way. Its very confusing to me. Is it possible that the bpv is being stuck open for those few seconds? It does it in any gear shift now. Here are a couple 3-4 gear shift logs.
Attachment 69774

Attachment 69775

[paulwalll]

I'm stumped. Still having the shifting problem, ffs doesn't work at high rpm, and the rev limiter isn't working right. Everything mechanically on the car is fine, zero boost/intake leaks. The only thing i can think of is a sensor failing or there is a bug in the ap firmware. Here is another log of me holding the gas pedal down 100% for a few seconds. Super odd behavior. Sorry if i bother you Lex , but you seem to have alot of knowledge on troubleshooting.

datalog1.csv

[speed3sailor]

You try disabling FFS and LC? If its not working right than just get rid of it. Maybe it has something to do with the FFS RPM settings

[Manny]

in b4 OP buys a vette

[world famous z]

Originally Posted by paulwalll The occ is between the crannkcase and IM. I replaced the valve between The IM and occ. The recirc hose was tightened and is good now. My problem isn't so much of a stutter, its feels like my throttle is shut for a second or two after i shift fast. Logs show that the tp is open all the way. Its very confusing to me. Is it possible that the bpv is being stuck open for those few seconds? It does it in any gear shift now. Here are a couple 3-4 gear shift logs. Attachment 69774 Attachment 69775

did you notice this issue after installing the OCC by chance? Or was it something that crept up later on? What type of OCC are you running? I've heard a few issues on some cars depending on their OCC setups and how they had them installed that caused similar issues but there are obviously tons of variables to consider.... I'm just curious

[paulwalll]

Originally Posted by speed3sailor You try disabling FFS and LC? If its not working right than just get rid of it. Maybe it has something to do with the FFS RPM settings

Yes, i put them back to ots parameters with no success.

Originally Posted by world famous z did you notice this issue after installing the OCC by chance? Or was it something that crept up later on? What type of OCC are you running? I've heard a few issues on some cars depending on their OCC setups and how they had them installed that caused similar issues but there are obviously tons of variables to consider.... I'm just curious

I've had an occ on my car for over two years with no problem. I have a watts cc.

[Manny]

bump for a friendly beaner

[speed3sailor]

Still having issues man?

[speed3sailor]

i just noticed you went BT. i wana go for a ride some time.