Water injection issue?

[FormulaMMM]

Back with the car, timed pump after a run today. 45 seconds. FWIW.

[Lienrocs]

Originally Posted by FormulaMMM

Back with the car, timed pump after a run today. 45 seconds. FWIW.

Well dang. What exactly did you tell your services advisor? I'm going to schedule an appointment and see if I can nip this in the bud.

[FormulaMMM]

Originally Posted by Lienrocs

Well dang. What exactly did you tell your services advisor? I'm going to schedule an appointment and see if I can nip this in the bud.

Apologies for the ambiguity... Meaning I've returned home to the car and took it out today. It wasn't in service.

I think if OP got the entire system replaced and it's still ~90 seconds, variability is to be expected, I guess

[Lienrocs]

Originally Posted by FormulaMMM

Apologies for the ambiguity... Meaning I've returned home to the car and took it out today. It wasn't in service.

I think if OP got the entire system replaced and it's still ~90 seconds, variability is to be expected, I guess

Gotcha. That makes sense. I was worried. I'll schedule an appointment just in case. Thanks for the clarification.

[BarryB]

Originally Posted by FormulaMMM

Apologies for the ambiguity... Meaning I've returned home to the car and took it out today. It wasn't in service.

I think if OP got the entire system replaced and it's still ~90 seconds, variability is to be expected, I guess

But it turns out I had a low pressure fault which was the reason for replacement.....

[Gomeler]

Drag the M4 out of winter storage, fill up the water tank, and beat on it mercilessly in the canyons for ~90 miles. A ton of 5000-7000rpm WOT pulls in 2nd and 3rd trying to keep up with some Ducatis. Went through 9.5 gallons of gas, water sitting at the same level as when I started. Service appointment scheduled for the 16th, going to start with a filter replacement and see what happens with my first track-day of the year on the 19th.

edit: ordered a pair of filters, going to replace the filter tomorrow and seeing if that resolves it. Have a dyno day scheduled for the 13th for NASA TT classing, really trying to avoid bumping that date.

[BarryB]

Something is not right. Keep us posted. you're also being robbed of hp...

[Gomeler]

Originally Posted by BarryB

Something is not right. Keep us posted. you're also being robbed of hp...

Yup. Was out with a friend's stage 2 M235i and a pair of Ducatis, and I wasn't reeling in the M235i coming out of corners like I normally do. Turn on the power/torque meter and.. reporting 415hp peak. That's what made me check the water consumption.

[Lienrocs]

Originally Posted by Gomeler

Yup. Was out with a friend's stage 2 M235i and a pair of Ducatis, and I wasn't reeling in the M235i coming out of corners like I normally do. Turn on the power/torque meter and.. reporting 415hp peak. That's what made me check the water consumption.

You'll know when the water injection is working. It'll pull like a freight train all the way to redline. Hopefully you get it sorted out!

[Gomeler]

Replaced the filter. The filter was supposedly replaced at the last service ~400 miles ago, but judging from the o-ring hardness, that filter is 3.5 years old. The car consumed ~300mL of water in 20 miles up and down a canyon, so it would appear to be working. I've got a dyno day on Saturday, that'll confirm if everything is working correctly.

I didn't have a thin/strong enough straight pick to pry the o-ring out of the bottom of the valve block. Both o-rings were incredibly stiff compared to the replacements in the kit. Going to find a pick that'll work and try again. Bosch could have designed that filter placement to be a bit more maintenance friendly..

[Lienrocs]

Originally Posted by Gomeler

Replaced the filter. The filter was supposedly replaced at the last service ~400 miles ago, but judging from the o-ring hardness, that filter is 3.5 years old. The car consumed ~300mL of water in 20 miles up and down a canyon, so it would appear to be working. I've got a dyno day on Saturday, that'll confirm if everything is working correctly.

I didn't have a thin/strong enough straight pick to pry the o-ring out of the bottom of the valve block. Both o-rings were incredibly stiff compared to the replacements in the kit. Going to find a pick that'll work and try again. Bosch could have designed that filter placement to be a bit more maintenance friendly..

Agreed on the ease of replacement comment. The first time I did it took several hours to get the original o ring out. Same problem, it was really stiff and I didn't want to damage anything.

[Gomeler]

God. Damnit.



A stock M3 Competition dyno'd right before me.



But the car consumed ~300mL of water a few days ago while doing a canyon cruise. Dealership appointment on Tuesday, will be curious to see what they can find. It's clearly running the ZCP map.

Run zero hit ~420whp. Run three and four bucked like in the fifth run but registered ~430whp. Not sure if the ECU was pulling timing from heat, or if there was a little wheel slip. We stopped on the fifth run because it just kept bucking around peak torque.

Unrelated, this was the first time I was outside of the car while doing WOT pulls. My friends have commented on how loud it is above 5k and during shifts, but I had no idea. I could not imagine putting catless downpipes on this thing, it's so obscenely loud even with ear plugs.

edit: I'm hoping the dealership finds something. I need to see what I can do to reset the ECU and/or water injection outside of a battery pull. Curious if it defaulted to the ZCP tune from either running low on water at my last track day, or from the filter, and it requires some secret toggle to flip back. Anyone have experience with this? For reference the car reports ~420hp/450tq in the in-car power display.

[bioman]

I believe it needs to be hitting close to 500 on the display.

Is there a diy to check the filter? Once you pull the filter out can you just plop it back in?

[FormulaMMM]

Originally Posted by Gomeler

edit: I'm hoping the dealership finds something. I need to see what I can do to reset the ECU and/or water injection outside of a battery pull. Curious if it defaulted to the ZCP tune from either running low on water at my last track day, or from the filter, and it requires some secret toggle to flip back. Anyone have experience with this? For reference the car reports ~420hp/450tq in the in-car power display.

Sorry to hear, man. On the positive side, good to know that the sport displays can actually be used as a diagnostic tool.

Will be interested to see what the cause is. I don't think a reset after running low on water is required, but can't be sure. I've run low, but never low enough to trigger the warning.

[Gomeler]

Water injection block replacement, their diagnostic indicated low water flow and calls for replacement of the valve block. Sounds like a pretty common story. Got the car back, going to the track on Friday, guess it'll just be a fancy ZCP. ETA of late June for part arrival. Tech said I can look at the block when they pull it, but I won't be able to disassemble it. Would really like to see if there is corrosion in there.

[M4_GTS]

Originally Posted by Gomeler

Water injection block replacement, their diagnostic indicated low water flow and calls for replacement of the valve block. Sounds like a pretty common story. Got the car back, going to the track on Friday, guess it'll just be a fancy ZCP. ETA of late June for part arrival. Tech said I can look at the block when they pull it, but I won't be able to disassemble it. Would really like to see if there is corrosion in there.

i had my water block replaced a few weeks back. My service advisor who is a friend of mine said BMW in Germany requested to have the faulty block shipped back to them.

[Gomeler]

Originally Posted by M4_GTS

i had my water block replaced a few weeks back. My service advisor who is a friend of mine said BMW in Germany requested to have the faulty block shipped back to them.

Yup, I was told it'll be shipped back for teardown/analysis.

[Gomeler]

2.5 hours on track, ~25 gallons of gas, and the car still drank 1.5 tanks of water with the ZCP map. Pretty interesting that the car is clearly injecting water with the lower performance tune and whatever is going on with the valve block to trigger a low flow error. Just another data point. Valve block hopefully gets replaced the week after next.

[FormulaMMM]

Originally Posted by Gomeler

2.5 hours on track, ~25 gallons of gas, and the car still drank 1.5 tanks of water with the ZCP map. Pretty interesting that the car is clearly injecting water with the lower performance tune and whatever is going on with the valve block to trigger a low flow error. Just another data point. Valve block hopefully gets replaced the week after next.

Did it feel underpowered compared to prior sessions? Max speed data?

[Gomeler]

Originally Posted by FormulaMMM

Did it feel underpowered compared to prior sessions? Max speed data?

Definitely down in power. 134-138 on the back straight vs 142-146 previously. Could be not being confident in the NT01's on the turn leading to the straight and losing a little speed there, but probably not such a big difference as I saw.

[FormulaMMM]

Originally Posted by Gomeler

Definitely down in power. 134-138 on the back straight vs 142-146 previously. Could be not being confident in the NT01's on the turn leading to the straight and losing a little speed there, but probably not such a big difference as I saw.

Nah, you'd have to be really extending brake zone for that sort of gap. Glad you're getting it sorted under warranty.

[Day Laborer]

Owning a OBD2 scan tool, along with something like Bimmercode or Carly for BMW is really a must for GTS owners; I periodically check it for fault codes related to the water injection as those codes do not show up in the iDrive; specifically the "water pressure too low" code