Issue with sudden Timing drop - log included

[Silent11]

Im having this issue where timing drops for a second and then comes back. Any clues to what would cause this ?

2007 E92 335i / VRSF 7.5 Race FMIC-Charge Pipe-DCI-Inlets/ TurboSmart Plumb Back DV / XHP / E50 Custom Tune by WedgePerformance / APEX ARC8 / MT ET Street / 11.4 @ 120 / Instagram @silent11n54

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[Silent11]

I've switched this thread to question format and moved to Troubleshooting.



You also have to take into account that it is occurring at the same time your rail pressure 'maxes out' after coming from a figure way down low. Marty might have a point, you never know what kind of relationship that stuff has. Well, someone probably does but I don't. In these cases, it can be helpful to fix what you do know is wrong, like your rail pressure. That post shift rail pressure of like 700's is not healthy at all, get that fixed regardless of what this timing correction is caused by. Might even kill two birds with one stone.

would love to fix that if i had a clue how... its a new hpfp, ill try martys suggestion of removing the hpfp filter, that might give me a few hundred psi of room, dont want to just throw money at injectors even though mine are index 1s, and they "seem" to be functioning. I've had at least 20 1/4 mile passes on this tune, seen rail go down to 1000 and not get any timing cuts like this...

 

[doublespaces]

would love to fix that if i had a clue how... its a new hpfp, ill try martys suggestion of removing the hpfp filter, that might give me a few hundred psi of room, dont want to just throw money at injectors even though mine are index 1s, and they "seem" to be functioning. I've had at least 20 1/4 mile passes on this tune, seen rail go down to 1000 and not get any timing cuts like this...

Have you tried backing off on the ethanol mix until it clears up?

 

[Silent11]

Have you tried backing off on the ethanol mix until it clears up?

i just loaded an older e40 tune, i will post the results later.

 

[Silent11]

old e40 tune seems to hold timing without drops

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[doublespaces]

And as a sanity check, you changed your fuel mix in addition to the tune right?

Your boost is up a couple pounds as well, I'm curious what other people think?

 

[RSL]

And as a sanity check, you changed your fuel mix in addition to the tune right?

Your boost is up a couple pounds as well, I'm curious what other people think?

It doesn't run 750+nm torque (or over 200 load) either. Torque would be the first thing I'd rule out, especially if the rest of the maps are relatively similar.

 

[martymil]

no major fuel pressure drops and no lpfp spikes and timing is all ok.

That is a huge improvement and much better WGDC.

That is a good tune.

 

[Silent11]

And as a sanity check, you changed your fuel mix in addition to the tune right?

Your boost is up a couple pounds as well, I'm curious what other people think?

it was a fresh tank of gas with around 5.3 gallons of E85 ( tested E86)

its a tune i ran before inlets and lpfp stage 2 so well down in power from the previous one

i guess i will try older E50 tunes now and see where it starts to cut timing.

 

[Silent11]

Here is a weaker E50 tune that i loaded this morning

Thoughts ?

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[doublespaces]

Also as a tip, if you click/touch a trace like load or rail pressure, it will isolate to its own axis so it doesn't squish the rest.

 

[martymil]

Yeah that tune is not great for longevity of those turbos.

wgdc is maxed and cant hit target, stft's are a little negative.

Fuel pressures and timing is good.

Prefer the other tune

 

[Silent11]

Yeah that tune is not great for longevity of those turbos.

wgdc is maxed and cant hit target, stft's are a little negative.

Fuel pressures and timing is good.

Prefer the other tune

i see what you are saying, its just that the old e40 tune is at least 0.5 slower at the drag strip so a bit pointless to drag it on that map. I've had the e50 map loaded for a full season with over 40 passes and dailying it on that map as well. Turbos are still hanging on

Thanks for all the help guys !

 

[martymil]

I understand its a little slower but in terms of which tune is better for your car is a different story.

Its only advice and its your car.

 

[Silent11]

Yeah that tune is not great for longevity of those turbos.

wgdc is maxed and cant hit target, stft's are a little negative.

Fuel pressures and timing is good.

Prefer the other tune

Do you mind explaining a bit about the stft's ? i thought it is better to have negative than positive stft's ?

 

[martymil]

You want neutral stfts so the injectors can pull fuel or add fuel.

Having them negative doesn't leave room to pull fuel out of a tune making it run richer if the ecu maxes the negative stfts out, how rich really depends on how much the ecu needs.

Running rich soots your cats and o2 sensors.

 

[Silent11]

Just wanted your opinion on a friends log

How much timing is too much timing ?
Stock turbos, helix

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[martymil]

To much boost and too much timing for stock turbos

WGDC is just slammed shut and pinned at 100%

That is what we call a kill tune.

You could achieve the same results with 20 psi boost and half the timing

Though the logs looks good its terrible for the car and the tuner has no business suppling tunes like that
unless your friend asked for it specifically.

 

[Silent11]

To much boost and too much timing for stock turbos

WGDC is just slammed shut and pinned at 100%

That is what we call a kill tune.

You could achieve the same results with 20 psi boost and half the timing

Though the logs looks good its terrible for the car and the tuner has no business suppling tunes like that
unless your friend asked for it specifically.

it was definitely a kill tune by request

I think the plan is running a 10 sec pass with full weight on stock turbos.

 

[veer90]

Well if you don't turn down the timing you're definitely gonna kill something lmao

MBT is like 13* on E50 or thereabouts 18* is waaaaaaayyyy too much timing

 

[Silent11]

Well if you don't turn down the timing you're definitely gonna kill something lmao

MBT is like 13* on E50 or thereabouts 18* is waaaaaaayyyy too much timing

he is using E100 fuel and has R8 coils so i think that is helping with timing too.