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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > N55 Wastegate DC% logs



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      07-06-2010, 03:23 PM   #1
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N55 Wastegate DC% logs

Interesting stuff:



At the same stock boost pressure, it runs a lot higher wastegate DC% than the n54 which peaks out at around 35% in similar conditions. This suggests that the wastegate spring is softer, the wastegate solenoid bleed smaller, the turbocharger has less capacity or a combination of the three.

For comparison, this Wastegate DC% curve in a n54 would yield around 12-13psi.

Shiv
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      07-06-2010, 03:38 PM   #2
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Most these findings on the new N55, seems to prove that the N54 is a much stronger engine.
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      07-06-2010, 03:44 PM   #3
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Quote:
Originally Posted by AltecBX View Post
Most these findings on the new N55, seems to prove that the N54 is a much stronger engine.
The n54 is definitely more tune friendly in terms that there is a lot of overhead in the factory boost control system. We still don't know, for a fact, that the n55's turbo capacity is lower (ie, can't support as much power).

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      07-06-2010, 03:49 PM   #4
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Quote:
Originally Posted by shiv@vishnu View Post
The n54 is definitely more tune friendly in terms that there is a lot of overhead in the factory boost control system. We still don't know, for a fact, that the n55's turbo capacity is lower (ie, can't support as much power).

Shiv
Hopefully it isn't less capacity. Hopefully they just decided to throw in an extra hurdle or two via hardware limitations that would discourage a percentage of the casual owners. With the N54 is was so easy to throw on a piggy. If it requires adiditonal hardware swaps maybe they figure they can cut down on tuned n55's by a good amount?
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      07-06-2010, 03:51 PM   #5
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subscribing...
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      07-06-2010, 04:14 PM   #6
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good info
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      07-06-2010, 04:22 PM   #7
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shiv, so the outlook of stock vs stock tuned, the engine output seems to steer to less power than the n54 due to possible turbo output...question is, does it look like a turbo upgrade would be much easier to do on the n55? im not sure what the hardware is like on that engine and to me it would seem logical that upgrading the turbo should be a lot sooner and easier than the n54.

i guess i just can't wait to solidify the decision to keep my car or get a 135i with 7speeds :-)

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      07-06-2010, 04:40 PM   #8
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Quote:
Originally Posted by maui86 View Post
...question is, does it look like a turbo upgrade would be much easier to do on the n55?

teri
Think about it: everything is halved:

1. You have half the intake plumbing
2. You have half the exhaust plumbing
3. You have half the number of turbochargers and their supporting hardware such as coolant and oil lines

For one, you *should* have more space in the engine bay to work with, less plumbing to deal with. The fuel pump is the same as the one used in N54 engines.

So, *theoretically* it should be easier from hardware stand point to upgrade the turbo on the N55. Now, software wise, noone really knows but I have high confidence in the tuners.
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      07-06-2010, 05:05 PM   #9
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Quote:
Originally Posted by vasillalov View Post
Think about it: everything is halved:

1. You have half the intake plumbing
2. You have half the exhaust plumbing
3. You have half the number of turbochargers and their supporting hardware such as coolant and oil lines

For one, you *should* have more space in the engine bay to work with, less plumbing to deal with. The fuel pump is the same as the one used in N54 engines.

So, *theoretically* it should be easier from hardware stand point to upgrade the turbo on the N55. Now, software wise, noone really knows but I have high confidence in the tuners.
In fact, due to the twin-scroll system some of the systems such are the exhaust plumbing are very complicated in the N55. And replacing a twin-scroll with a simple single-scroll would really ruin the lag-free feel of the engine.
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      07-06-2010, 06:21 PM   #10
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Quote:
Originally Posted by shiv@vishnu View Post
Interesting stuff:

Those shifts are simply fantastic!!!!

That 7DCT is desireable.
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      07-06-2010, 07:17 PM   #11
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Quote:
Originally Posted by vasillalov View Post
Think about it: everything is halved:

1. You have half the intake plumbing
2. You have half the exhaust plumbing
3. You have half the number of turbochargers and their supporting hardware such as coolant and oil lines

For one, you *should* have more space in the engine bay to work with, less plumbing to deal with. The fuel pump is the same as the one used in N54 engines.

So, *theoretically* it should be easier from hardware stand point to upgrade the turbo on the N55. Now, software wise, noone really knows but I have high confidence in the tuners.
haha...im sorry, i meant to compare converting the n54 to single turbo. does the work look like it would be roughly the same as upgrading the turbo on the n55. there...the other stuff i figured was common sense in terms of upgrading the twins. :-) my bad.

im just almost sold on the dct trans.
teri
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      07-06-2010, 07:59 PM   #12
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Quote:
Originally Posted by maui86 View Post
haha...im sorry, i meant to compare converting the n54 to single turbo. does the work look like it would be roughly the same as upgrading the turbo on the n55. there...the other stuff i figured was common sense in terms of upgrading the twins. :-) my bad.

im just almost sold on the dct trans.
teri
I was skeptical on Auto-manuals until i bought my MKV GTi with DSG, and that tranny rocks, I assume the DCT is just that much better. Don't get me wrong, I love my 6MT in my E92, but Dual Clutch Trannys are great. SMG on the other hand, that thing was awful.
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      07-06-2010, 08:01 PM   #13
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Quote:
Originally Posted by cstavaru View Post
In fact, due to the twin-scroll system some of the systems such are the exhaust plumbing are very complicated in the N55. And replacing a twin-scroll with a simple single-scroll would really ruin the lag-free feel of the engine.
any reason why you cant just replace it with a better twin scroll? I dont see why not.
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      07-06-2010, 08:05 PM   #14
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Maybe this is a stupid question, but does anyone know what type of TwinScroll they are using in the N55? Couldn't it be upgraded to a Garrett GT35R Twin Scroll? Or something similiar?
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      07-06-2010, 08:44 PM   #15
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Perhaps this is an indication that you will need to swap out turbo hardward to safely produce more boost on the N55 as it seems like that twin scroll is working pretty hard already with the duty cycles.
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      07-10-2010, 12:09 AM   #16
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HHmm. I did the muffler delete yesterday and my 1/4 times suffered today. Seems like it needed to launch at higher rpms for the car to actually lower my 60' times. And my 1/4 trap speeds were lower by almost 2-3 mph.

Pre MD I would launch at 1500rpm and today I had to launch around 2krpm. Any thoughts?
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      07-10-2010, 09:12 AM   #17
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Can't help but notice the boost spike of 4 psi or so when the throttle closes.

And this is on stock?





Quote:
Originally Posted by shiv@vishnu View Post
Interesting stuff:



Shiv
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      07-10-2010, 09:39 AM   #18
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Quote:
Originally Posted by shockin330i View Post
HHmm. I did the muffler delete yesterday and my 1/4 times suffered today. Seems like it needed to launch at higher rpms for the car to actually lower my 60' times. And my 1/4 trap speeds were lower by almost 2-3 mph.

Pre MD I would launch at 1500rpm and today I had to launch around 2krpm. Any thoughts?
Any sound clips i was thinking about doing this also
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      07-10-2010, 12:23 PM   #19
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I'll take some later, but it does sound legit. But I'm just not liking how much my 1/4 dropped...
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      07-10-2010, 01:45 PM   #20
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Quote:
Originally Posted by Army335xi View Post
Maybe this is a stupid question, but does anyone know what type of TwinScroll they are using in the N55? Couldn't it be upgraded to a Garrett GT35R Twin Scroll? Or something similiar?
N55 used Borg Warner turbo, it could be K03, K04 or K24 I'm not sure.
http://www.turbos.bwauto.com/product...sGasoline.aspx
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      07-11-2010, 02:09 PM   #21
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Quote:
Originally Posted by Ilma View Post
Can't help but notice the boost spike of 4 psi or so when the throttle closes.

And this is on stock?
Yep. Totally stock tune. The spike perfectly normal given the closing of the actual throttle blade (not available for logging at the time).

Shiv
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      07-11-2010, 02:13 PM   #22
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Quick Update:

Very productive weekend so far. Just got logging/viewing access to all the CAN channels necessary for v4 tuning logic:

-Actual dbw throttle
-Oil temp
-DME boost target
-DME actual boost before throttle blade
-Air intake temp

The CAN logic is a bit different from that of the n54 so this job was harder than expected. The scaling is also different on many of the channels which came as a surprise. But so far, I'd say we are 80% of the way to have a fully functional v4 tune for the n55. With autotuning to follow a few weeks after (firmware update only).

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