Hesitation in boost and high rpm

[StinkinLinkin13]

I agree with you on what I believe is a completely unnecessary 3 bar map considering the boost levels I've seen. And yes I am speculating on what's causing the issue mostly because I don't have any tuning experience and I'm not exactly sure what parameters they changed. So I'm basically just using my tech experience to diagnose this as I would out in the field. So yea. Its a bit harder to diag with this custom tune... If not Impossible. I just need to rule out what I can. Added a screenshot of my gauges form torque on my drive to work earlier.

 

[polskifacet]

I agree with you on what I believe is a completely unnecessary 3 bar map considering the boost levels I've seen. And yes I am speculating on what's causing the issue mostly because I don't have any tuning experience and I'm not exactly sure what parameters they changed. So I'm basically just using my tech experience to diagnose this as I would out in the field. So yea. Its a bit harder to diag with this custom tune... If not Impossible. I just need to rule out what I can. Added a screenshot of my gauges form torque on my drive to work earlier.

Different then my strategy.

 

[StinkinLinkin13]

Im not sure if this had been mentioned or tried before. But on my drive home i did a little bit of experimenting. I put the car in S manual mode. I would accelerate at approx half throttle all the way until it shifted on its own at about 6500. Had no issues whatsoever with misfires that way even from second to third. What I found odd is that as I tried to do a wot pull in manual but still allow it to auto shift and it would not. It hit a brick wall of misfires at about 6k (+or-) and never auto "safety" shifted. Not sure if it was rev limiter or combination. Never the less. I won't try that again. But the part throttle acceleration had no stutters even at highest rpms.

 

[polskifacet]

Sounds like potentially traction issue. Try with traction control off.

 

[StinkinLinkin13]

TC was off at the time. It normally is off when I'm "testing"...

 

[polskifacet]

TC was off at the time. It normally is off when I'm "testing"...

I had the exact issues with my LMS tune. I only had shifting problems with AJP on the meth tune when it was cold out but Brad did his tuning magic and adjusted some shift pressures and such and I haven't experienced it since. It unfortunately almost makes me happy that I'm not the only one, most of the guys were already tired of my moaning and groaning lol.

 

[FoMoCoSHO]

Im not sure if this had been mentioned or tried before. But on my drive home i did a little bit of experimenting. I put the car in S manual mode. I would accelerate at approx half throttle all the way until it shifted on its own at about 6500. Had no issues whatsoever with misfires that way even from second to third. What I found odd is that as I tried to do a wot pull in manual but still allow it to auto shift and it would not. It hit a brick wall of misfires at about 6k (+or-) and never auto "safety" shifted. Not sure if it was rev limiter or combination. Never the less. I won't try that again. But the part throttle acceleration had no stutters even at highest rpms.

Are you sure these are actual misfires?

Do you have a CEL?

Thanks to the EPA It doesn't take many to throw a CEL

 

[StinkinLinkin13]

Funny. Me and you buddy. So did you just have to "eat" the 600$ LMS tune? I have no problem trying another tuner if they offered a refund... It hasn't even been a month yet. Seems like they would prefer that I settle on a older less aggressive tune... Well thats not what I shelled out my cash for. Its tougher knowing other people get that for their money but Id have to settle for less. But idk. We will see. No I have no CEL.

 

[Ramairetransam]

13 mks eb and i have seen first hand v11 93 3 bar issues with the lms tune . It had the chugging/hesitation at the top of 2nd and a little at top of first . Never any issues with v10 .  It actually has a v11 93 3 bar soft shift reduced power tune waiting to go in .

 

[StinkinLinkin13]

Thanks for the info. Im sure this isn't as isolated as it may seem. I did hear from LMS. They sent me some "updates" this morning and I hadn't even been in contact with them directly since I've been trying to get some data logs first. Im assuming they may have seen these postings.

 

[ajpturbo]

Im assuming they may have seen these postings.

Oh yes LMS trolls and lurks in the shadows just like the rest of us lol...don’t let them kid you

 

[StinkinLinkin13]

Im assuming they may have seen these postings.

Oh yes they troll and lurk in the shadows just like the rest of us lol...don’t let them kid you

Haha. It's a bit unfortunate that you seem more interested in my issues than they do thus far. Its frustrating emailing then waiting 2 days for a question "have you tried this tried that" then having to wait another 2 days for another swinging in the wind tune attempt "well try this tune or that tune". Anyhow. So correct me if I'm wrong but is the HPFP strictly a mechanical pump. Is there anyway for the pressure to be raised via the tune other than at the injectors. (Shortening pulse width-duration) In other words scaling back the tune. I just figured the hpfp would be able to handle these relatively mild tunes with no problem. Sorry guys if you're tired of hearing about this shyt. Just so far I bought a 900$ problem and it blows. Was looking forward to these mods and its just been an expensive problem.

 

[El_SHO]

Im assuming they may have seen these postings.

Oh yes LMS trolls and lurks in the shadows just like the rest of us lol...don’t let them kid you

I have this same problem, will ur tune correct this? I have the same ECU as polskifacet

 

[StealBlueSHO]

The LMS V11 tune on my 2016 works well... I do notice some big pressure drops in the rail pressure though.. and can imagine if you are somewhere where it’s cold, it would cause problems... at 40F I saw pressure drops below 1000psi which I don’t like...

Nothing you can really do helps the stock HPFP... you can lean out the mixture in the tune which will help take the load off the fuel system...


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[ajpturbo]

The LMS V11 tune on my 2016 works well... I do notice some big pressure drops in the rail pressure though.. and can imagine if you are somewhere where it’s cold, it would cause problems... at 40F I saw pressure drops below 1000psi which I don’t like...

Nothing you can really do helps the stock HPFP... you can lean out the mixture in the tune which will help take the load off the fuel system...


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You could do what was needed for Polski's problem....Max throttle control like stock....He actually said he didn't feel a difference in throttle response.

 

[StealBlueSHO]

The LMS V11 tune on my 2016 works well... I do notice some big pressure drops in the rail pressure though.. and can imagine if you are somewhere where it’s cold, it would cause problems... at 40F I saw pressure drops below 1000psi which I don’t like...

Nothing you can really do helps the stock HPFP... you can lean out the mixture in the tune which will help take the load off the fuel system...


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You could do what was needed for Polski's problem....Max throttle control like stock....He actually said he didn't feel a difference in throttle response.

True, I didn’t mention the throttle control portion but that makes a huge difference... but it does kill your VE from what I understand...

Additionally, it might have been the install on my meth kit, but when the throttle would close up to control the load, I would run rich for a second... my AFRs were not as stable when using the throttle to control load.

On my tunes without throttle control the AFRs were rock steady...





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[ajpturbo]

The LMS V11 tune on my 2016 works well... I do notice some big pressure drops in the rail pressure though.. and can imagine if you are somewhere where it’s cold, it would cause problems... at 40F I saw pressure drops below 1000psi which I don’t like...

Nothing you can really do helps the stock HPFP... you can lean out the mixture in the tune which will help take the load off the fuel system...


Sent from my iPhone using Tapatalk

You could do what was needed for Polski's problem....Max throttle control like stock....He actually said he didn't feel a difference in throttle response.

True, I didn’t mention the throttle control portion but that makes a huge difference... but it does kill your VE from what I understand...

Additionally, it might have been the install on my meth kit, but when the throttle would close up to control the load, I would run rich for a second... my AFRs were not as stable when using the throttle to control load.

On my tunes without throttle control the AFRs were rock steady...





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Saying that it kills VE may be a bit strong. I can’t say one way or another if it hurts 1/4 mile times. I would say the cars that run good 1/4 mine times with the throttle open is due to the power allowed by the uncontrolled boost spikes

Is running a bit rich at .75 lambda during throttle closure a terrible thing? Especially if it’s also preventing low fuel pressure. I know what scenario I would choose

 

[Skydogs]

Yeah love the throttle control in my tunes I dont feel it at all and it keeps deto at bay so we can push boost and timing to the jagged edge!! Can wait to run my car I feel I will make a few people say damnnnnn! LoL

 

[derfdog15]

Yeah love the throttle control in my tunes I dont feel it at all and it keeps deto at bay so we can push boost and timing to the jagged edge!! Can wait to run my car I feel I will make a few people say damnnnnn! LoL

That part is always fun. I remember when I ran 13.8 on the AJP 93, 3 bar tune. Just CAI, tune, and axle backs. People at the track legit asked me "How much over 10k have you spent on mods...there's no way thats a stock motor..." and I told em, "Few hundred in a tune and MAP sensor, axle backs were for sound but also a few hundred". No one believed it till I popped the hood. Quite a look of shock as well when you beat a big V8 car...

 

[ajpturbo]

Yeah love the throttle control in my tunes I dont feel it at all and it keeps deto at bay so we can push boost and timing to the jagged edge!! Can wait to run my car I feel I will make a few people say damnnnnn! LoL

That part is always fun. I remember when I ran 13.8 on the AJP 93, 3 bar tune. Just CAI, tune, and axle backs. People at the track legit asked me "How much over 10k have you spent on mods...there's no way thats a stock motor..." and I told em, "Few hundred in a tune and MAP sensor, axle backs were for sound but also a few hundred". No one believed it till I popped the hood. Quite a look of shock as well when you beat a big V8 car...

Think you mean 12.8 lol