[wheela]

Originally Posted by AmuroRay

I think that's because it's in a higher gear and more load? _ I'm not exactly sure how it all works. I've been playing around with my logs and they show something similar - 2nd gear to 4th. Either way, this wasn't X is better than Y, but more along the lines of HOW.

Really excited to see how it turns out at the track more than anything.

I agree that 2nd vs. 4th gear accounts for at least part of the wgdc% discrepancy. Here's my take on it: In 2nd gear the engine revs through the rpm faster than it does in 4th gear. This means the MAF target needed to hit load target increases at a faster rate in 2nd gear than it does in 4th gear. So the turbo has to work harder to keep up with the rate of MAF change and maintain boost on target in lower gears. So the higher the gear, the easier it is for the turbo to hit boost and load targets, so it can hit target quicker, and with less duty cycle than in lower gears

[M2guru]

Originally Posted by wheela

I agree that 2nd vs. 4th gear accounts for at least part of the wgdc% discrepancy. Here's my take on it: In 2nd gear the engine revs through the rpm faster than it does in 4th gear. This means the MAF target needed to hit load target increases at a faster rate in 2nd gear than it does in 4th gear. So the turbo has to work harder to keep up with the rate of MAF change and maintain boost on target in lower gears. So the higher the gear, the easier it is for the turbo to hit boost and load targets, so it can hit target quicker, and with less duty cycle than in lower gears

I have a couple logs from my dyno run that were conducted in 4th gear if you're interested in seeing those. Keep in mind it's not the same tune each time but run in a different gear - it's being refined each time with "wedge-4" being before "13-log". Note the wheelspin at around 4900rpm.

https://datazap.me/u/m2guru/13-log
https://datazap.me/u/m2guru/wedge-4

[AmuroRay]

Hope it will not be an issue.

[ThreeStripes]

I’ve got my old Turner charge pipe I can send ya if that’s of any help.

[3t3p]

Ah this is the PuRe 750 and 500hp on pump fuel!?

I was like wtf that's a heck of a stock turbo tune lol!

Still impressive what is spool lag like?

[AmuroRay]

Originally Posted by ThreeStripes

I’ve got my old Turner charge pipe I can send ya if that’s of any help.

Thanks! I think I got it to work though? Still testing.

[AmuroRay]

Originally Posted by 3t3p

Ah this is the PuRe 750 and 500hp on pump fuel!?

I was like wtf that's a heck of a stock turbo tune lol!

Still impressive what is spool lag like?

500WHP on pump fuel - so closer to 585-600hp at the engine!

[3t3p]

Originally Posted by AmuroRay

500WHP on pump fuel - so closer to 585-600hp at the engine!

Wow!

Must be seriously moving air and the car must be too! Crazy

[AmuroRay]

Originally Posted by wheela

Not saying outlets will do nothing, just that I think you'll get a lot more juice from the squeeze upgrading your intake piping than from upgrading your outlet piping.

Background:

My MAD chargepipe was leaking around the MAP sensor. The MAP sensor is a OE VDO unit I believe. It could have been the bolts, or the Oring, but we both remember the smoke coming from the MAP sensor no matter how much we tightened the bolts. Inspecting my MAD chargepipe shows the bolt holes for the MAP do not extend into the tube contrary to what I originally thought (I’ll post pictures in a bit) this is just like the Do88 unit.


I recently had both the DO88 charge pipe and boost pipe installed. While O expected the boost pipe to be physically larger than the stock version( the stock version on the M235i is different than the version on the M2.) There was also a surprise that the Do88 Chargepipe is a larger diameter than the MAD unit I took off.

I’m happy to know I actually “upgraded” in size, as I expected them to be about the same., Unfortunately during the install, I think my mechanic pinched the Orings and then replaced them with my old ones. He ordered a new set and will put them in this week for me. I’m also going to have him gap down my plugs (currently out of the box gap) to see if that helps clean up my timing - I’ve run a gallon of E85 to help clean the timing, and while it does, I think that running the appropriate gap is going to better in the long run.

I’ve expressed many times over I daily drive my car x3 times a week and out of sheer laziness, I don’t want to stop at the gas station twice as often (and there is only 1 station around me that has E85) the goal has always been the maximum output on Pump 93

In the meantime time, I managed to do some minor testing. I ran a few logs to test it out, and the first thing was that it did feel a little initial torque. Hard to tell beyond that because the power cut became more and more apparent as I did more and more runs.

However, and no one is going to believe this but there was a significant power gain noted in VD. Hasn’t been replicated since, but I’m going to change my MAP sensor to the stock 2.5bar back from the 3.5 and reflash and give it a run and see if that helps. VD/logs to follow.

[AmuroRay]

Here are the previous bests after I changed the O2 sensor. I've adjusted my VD to read closer to SAE correction on a dynojet (add 2.2% for STD correction) - On the original runs, I think I was testing if the intake snorkel worked but I have to review my notes. Also, no - I don't think it makes 450whp - realistically may 425whp:


Here is after the charge and boost pipe change:



Comparison of the best of both - specifically to highlight the changes in recorded boost pressure:

[AmuroRay]

One data point doesn't make a trend, so I'm going to test again and see what happens.

Nix the MAP change - he said that during this second leak test it was fine. I also pulled some 4th gear logs and the car hilariously hits 24psi. I can't change it.

[AmuroRay]

I found an extra run that might help the comparison a bit:

[AmuroRay]

A few things I've noticed since the pipe change is tip in throttle response is better. This is probably a result of a smaller leak then the 4 leaks I had before.

The second is sound - it does sound more "raw" compared to before. I makes the intake make more noise.

But the 3rd was the top end power increase. I'll post an image so you can visualize it with me - but the car drives wildly inconsistent. Some times it feels powerful, and other times like dog. There are always 2 pauses or hiccups (4000/4500 and around 5500/6000) and then the car pulls aggressively.

Recently, that pull has been very strong, especially at high RPM. I've noticed the car will keep accelerating until redline (7000RPM) and at times even harder than it does in mid range.

This picture visualizes the power delivery. You can see the huge dip around 6000RPM and then the VTEC like High RPM pull. This is one of those very unflattering runs, I just turned the smothing down so you can see how it feels from the seat of the pants.

[3t3p]

I've noticed a hysteresis feeling at times since doing the do88 boost pipe. It kind of feels like elastic banding?

Not sure if the built in lag between shifts on the 6MT is more pronounced or it just feels different.

Again it feels like the turbo could be tuned to the larger outlet pipe or just plain put a bigger turbo in.

Still wouldn't classify it as a big negative just an observation. Overall it's worth having imo even for sound alone!

So those graphs show power improvements from better pipes??

[AmuroRay]

Originally Posted by 3t3p

I've noticed a hysteresis feeling at times since doing the do88 boost pipe. It kind of feels like elastic banding?

Not sure if the built in lag between shifts on the 6MT is more pronounced or it just feels different.

Again it feels like the turbo could be tuned to the larger outlet pipe or just plain put a bigger turbo in.

Still wouldn't classify it as a big negative just an observation. Overall it's worth having imo even for sound alone!

So those graphs show power improvements from better pipes??

Allegedly. We'll see if the proof is in the pudding soon enough. Hoping someone else has done it with logs so we can review them.

[ThreeStripes]

Fixing boost leaks seemed to do wonders for me too.

[AmuroRay]

Originally Posted by ThreeStripes

Fixing boost leaks seemed to do wonders for me too.

Can you describe your symptoms?

[ThreeStripes]

Originally Posted by AmuroRay

Can you describe your symptoms?

https://f87.bimmerpost.com/forums/sh....php?t=2161184

Documented my experience with it there. I’ve got some .csv EcuTek logs from the extra high-speed OBD2 port I run with it captured on tape I can share if that’s helpful.

You can see it show up in both boost and rpm traces.

[M2Chad]

I ended up sticking with the FTP Hard pipe and new o'rings on Pure 500 install. Even tho I had purchased the DO88 silicon pipe to install a side by side comparison just didn't warrant the change. The silicon V2 MST is a great pairing for the new turbo however very happy with that.

[AmuroRay]

Originally Posted by M2Chad

I ended up sticking with the FTP Hard pipe and new o'rings on Pure 500 install. Even tho I had purchased the DO88 silicon pipe to install a side by side comparison just didn't warrant the change. The silicon V2 MST is a great pairing for the new turbo however very happy with that.

Did you have a chance to measure? The FTP looks smaller..

[F87source]

Originally Posted by AmuroRay

Did you have a chance to measure? The FTP looks smaller..

It definitely is, I used to own both pipes and the d088 is absolutely larger.

[M2Chad]

Larger isn't always better when air speed velocity is involved on IC piping & The inlet and exit of the intercooler is the same. When installing the Pure500 turbo it was debated and we opted to stay with the hard pipe hot and cold side.

Originally Posted by F87source

It definitely is, I used to own both pipes and the d088 is absolutely larger.