[ab987]

Originally Posted by Saif2018

MHD states around that figure so it should be reasonably accurate. No idea about calculations.

Right? So somebody running a tune with 8-9psi higher AND advanced timing making significantly less torque? IATs ain't gonna do that alone unless they are absolutely astronomical. Maybe it's running on hydrogen, Toyota borrowed an N54 to test for the hydrogen Yaris

[Saif2018]

Originally Posted by ab987

Right? So somebody running a tune with 8-9psi higher AND advanced timing making significantly less torque? IATs ain't gonna do that alone unless they are absolutely astronomical. Maybe it's running on hydrogen, Toyota borrowed an N54 to test for the hydrogen Yaris

Yeah it's not just IAT's, if it's stock turbos then he really wants it to blow lol.

Hydrogen bomb

Torque can be capped or limited for example using XHP or by map, but those psi levels are for hybrid turbos, nobody in their right mind would try running them on stock ones, it's not even any faster than a stage 2+ map, turbo's are screaming and he's probably bragging about 29psi 🤣

[Gregrobin]

Tried to do logs for the 2nd time yesterday.

I started off in M3 at 3000 RPMs, mashed the pedal, got to 6000 RPMs and the car shifted into 4th on it's own. At 7000 RPMs I backed off then the car shifted back into 3rd. I did this 3 times hoping I could shift to 4th but the car did it.

Here are the logs: https://datazap.me/u/gregrobin/gregs...og=0&data=3-22

Looks like I am at 14 - 18 PSI?

[Dave92N54]

Originally Posted by Gregrobin

Tried to do logs for the 2nd time yesterday.

I started off in M3 at 3000 RPMs, mashed the pedal, got to 6000 RPMs and the car shifted into 4th on it's own. At 7000 RPMs I backed off then the car shifted back into 3rd. I did this 3 times hoping I could shift to 4th but the car did it.

Here are the logs: https://datazap.me/u/gregrobin/gregs...&data=3-22

Looks like I am at 14 - 18 PSI?

Yep, looks like you're peaking around 16psi. Log looks pretty good except for the LPFP dropping very low. You don't want it to drop below 55psi.

Could be the sensor but based on the typical failure mode, and the failure I experienced (stuck reading 30-50psi at all times) i'd say pump, since it seems to sit at the proper psi and just plummets with the pull.

Edit: on mobile, I apologize for missing the lag in spool

[Saif2018]

Originally Posted by Gregrobin

Tried to do logs for the 2nd time yesterday.

I started off in M3 at 3000 RPMs, mashed the pedal, got to 6000 RPMs and the car shifted into 4th on it's own. At 7000 RPMs I backed off then the car shifted back into 3rd. I did this 3 times hoping I could shift to 4th but the car did it.

Here are the logs: https://datazap.me/u/gregrobin/gregs...og=0&data=3-22

Looks like I am at 14 - 18 PSI?

That looks really laggy, taking about 2000rpm till it reaches boost target at about 5k, your wastegates rattling/tired?

At 3k boost should be building up almost instantly.

[Gregrobin]

Originally Posted by Saif2018

That looks really laggy, taking about 2000rpm till it reaches boost target at about 5k, your wastegates rattling/tired?

I have no idea, I don't hear a rattle, how would I check for this?

How do I check the LPFP or sensor as well?

[Saif2018]

Originally Posted by Gregrobin

I have no idea, I don't hear a rattle, how would I check for this?

How do I check the LPFP or sensor as well?

You'll have to physically check or get someone to check if there's play on the actuator arms and tighten.

https://www.e90post.com/forums/showthread.php?t=176269

Just to note any software fix to Wastegate rattle will introduce lag.

[Dave92N54]

Originally Posted by Saif2018

You'll have to physically check or get someone to check if there's play on the actuator arms and tighten.

https://www.e90post.com/forums/showthread.php?t=176269

Just to note any software fix to Wastegate rattle will introduce lag.

I do know he's still on stock downpipes, not totally sure how that would play into lag. I'm sure there would be more but, I'd doubt 1500rpm more than compared to catless dps.

[Saif2018]

Originally Posted by Dave92N54

I do know he's still on stock downpipes, not totally sure how that would play into lag. I'm sure there would be more but, I'd doubt 1500rpm more than compared to catless dps.

Stock downpipes shouldn't cause any lag, I'm on stock downpipes and it takes about ~ 500-600rpm to hit boost target from wot at 2.5k

I can only imagine 4 x longer would be painfully laggy. Can't think of anything other than tired wastegates causing the lag.

[Gregrobin]

I watched the video and did some research, I don't think I have the ticking wastegate issue, never heard this sound before.

[Dave92N54]

Originally Posted by Gregrobin

I watched the video and did some research, I don't think I have the ticking wastegate issue, never heard this sound before.

I can definitely say the stock downpipes hide it a lot. I'd never heard any at all either, first startup with my downpipes and I went "You're fucking kidding me…". I don't think the issue is your wastegates though, I could totally be wrong of course.

Looking at the logs on my computer now.

So looking at them, I don't want to say wastegates bc if they weren't seating properly, your boost would not be as steady as it is once you hit target. It my take you a while to hit target but after that you're right on target to redline. To me it looks almost like their is some kind of restriction causing slow spool. Are you on stock airbox? (I'd be really curious to see how you'd do with downpipes. I almost want to say like a clogged cat but you'd likely have bigger issues).

Your WGDC is also kind of high once you hit target. I too run 1+ and looking at my last log on datazap, once I hit target (only takes me 300rpm) my WGDC sits around 45-50 while yours is at 63 pretty much the whole way after you hit target. Normally a higher WGDC may indicate a boost leak but unless this is some leak that is sealing itself back up under enough boost, I doubt it. At this point i'd probably start by checking vacuum coming out of the canisters, if it's steady and around 20 or above i'd suggest trying to test your boost solenoids. If your wastegate vacuum lines haven't been changed, i'd do it. The rear is really easy and tbh I found the front fairly easy with the canisters removed. Took me probably 20 minutes to replace the front line, including canister removal. Just use some silicone lube on the lines and they slide on pretty easy.

[Gregrobin]

Originally Posted by Dave92N54

I can definitely say the stock downpipes hide it a lot. I'd never heard any at all either, first startup with my downpipes and I went "You're fucking kidding me…". I don't think the issue is your wastegates though, I could totally be wrong of course.

Looking at the logs on my computer now.

So looking at them, I don't want to say wastegates bc if they weren't seating properly, your boost would not be as steady as it is once you hit target. It my take you a while to hit target but after that you're right on target to redline. To me it looks almost like their is some kind of restriction causing slow spool. Are you on stock airbox? (I'd be really curious to see how you'd do with downpipes. I almost want to say like a clogged cat but you'd likely have bigger issues).

Your WGDC is also kind of high once you hit target. I too run 1+ and looking at my last log on datazap, once I hit target (only takes me 300rpm) my WGDC sits around 45-50 while yours is at 63 pretty much the whole way after you hit target. Normally a higher WGDC may indicate a boost leak but unless this is some leak that is sealing itself back up under enough boost, I doubt it. At this point i'd probably start by checking vacuum coming out of the canisters, if it's steady and around 20 or above i'd suggest trying to test your boost solenoids. If your wastegate vacuum lines haven't been changed, i'd do it. The rear is really easy and tbh I found the front fairly easy with the canisters removed. Took me probably 20 minutes to replace the front line, including canister removal. Just use some silicone lube on the lines and they slide on pretty easy.

Thank you for taking the time to do this analysis for me and the thoughtful reply. No I'm not on the stock air box, I have DCIs.

Looks like I have more work to do.

[RSL]

Delay to boost is because of kickdown. The pulls started in 3rd and it shifted to 2nd in all 3 before it went anywhere. That takes time and doesn't start until WOT/full target. WOT without pressing into the kickdown button or disable kickdown.

For those commenting on torques, the torque actual param is an internal DME value and can be set anywhere. It has no bearing whatsoever on power/torque the engine actually making.

[Dave92N54]

RSL back to make us all look stupid again

Guess this is the last time I skip looking at gear

[Saif2018]

Originally Posted by Dave92N54

RSL back to make us all look stupid again

Guess this is the last time I skip looking at gear

lol, yeah forgot about kickdown 🤦

[Gregrobin]

Thanks again, kickdown is new to me, can someone explain this to me? Or direct me to a link to read.

[ab987]

Originally Posted by RSL

Delay to boost is because of kickdown. The pulls started in 3rd and it shifted to 2nd in all 3 before it went anywhere. That takes time and doesn't start until WOT/full target. WOT without pressing into the kickdown button or disable kickdown.

For those commenting on torques, the torque actual param is an internal DME value and can be set anywhere. It has no bearing whatsoever on power/torque the engine actually making.

I thought so on the torque actual value. But that value did seem pretty accurate on that log up above given the 100-200 time, it was around the same as mine and I bet it wasn't an e93. And if it can be set anywhere, wouldn't a tune have to manually set it for it to be inaccurate? Doesn't the DME calculate and update it every x ms? Sorry for dragging this on, just my software engineer side coming out and it sounds like you might know what's actually going on here

[Dave92N54]

Originally Posted by Gregrobin

Thanks again, kickdown is new to me, can someone explain this to me? Or direct me to a link to read.

It's a mechanism of your gas pedal, so when you mash the pedal, the car downshifts to the "optimal" gear for acceleration. I know there is a way to disable it, but i'm 6MT so not sure how.

[Gregrobin]

Originally Posted by ab987

I thought so on the torque actual value. But that value did seem pretty accurate on that log up above given the 100-200 time, it was around the same as mine and I bet it wasn't an e93. And if it can be set anywhere, wouldn't a tune have to manually set it for it to be inaccurate? Doesn't the DME calculate and update it every x ms? Sorry for dragging this on, just my software engineer side coming out and it sounds like you might know what's actually going on here

Mine is a 2008 E93 with MHD Stage 1+

Is everyone saying my numbers are good, no wastegate, LPFP issue?

And that the odd data logged is a result of kickdown?

[Saif2018]

Originally Posted by Gregrobin

Mine is a 2008 E93 with MHD Stage 1+

Is everyone saying my numbers are good, no wastegate, LPFP issue?

And that the odd data logged is a result of kickdown?

Your LPFP is dropping below 50 psi and WGDC is a bit high for Stage 1+

[Gregrobin]

Thanks, should I go back from MHD Stage 1+ to 1 until I get these resolved?

[Saif2018]

Originally Posted by Gregrobin

Thanks, should I go back from MHD Stage 1+ to 1 until I get these resolved?

You can do yes. WGDC is not dangerously high but LPFP dropping below 50 psi is not good.