[AmuroRay]

Hey, have you always been using the V1 MILVS? And any results yet after tuning for them? The last dyno I saw was only just lift changes - anything else found with them?

[sqwinny]

Originally Posted by AmuroRay

Hey, have you always been using the V1 MILVS? And any results yet after tuning for them? The last dyno I saw was only just lift changes - anything else found with them?

I saw a 6whp gain at peak with the “v1 Bimmermilvs which is only 0.5mm life increase (9.9 -> 10.4mm lift)” however as previously discussed my peak power didn’t fall off a cliff at 6200 rpm or so. It stuck around with a +/- of 10whp from peak power until 6700 rpm or so. No tuning changes, dme did the adaptions for me. Attempted changes with vanos, it was very happy at stock n20/n26 cam profile settings. DME made the fuel adjustments due to increased air.

Other folks have seen 10whp and the same powerband change with the “v3 Bimmermilvs” which is the full 1.0mm gain (9.9mm -> 10.9mm lift)

[sqwinny]

She is alive and running. Time for break in and time to get some retuned numbers with the built motor + built and ported head + Bimmermilvs v3 + TTE400 with larger exhaust manifold from the mambatek turbo.

Photo shown of car and the difference in turbo manifold size of stock (stock/MHI/Vargas/Dinan/pure stage 2/TTE400 vs revised mambatek).

Top is larger mamba estimated .48-.50 ar ratio , lower is the stock .41 ar ratio manifold.

[AmuroRay]

Wow! This is going to be good, I can’t wait!

[_ObiJon]

Originally Posted by AmuroRay

Wow! This is going to be good, I can’t wait!

Me either!

[yobo9193]

Always love seeing the base engine get some love. Idk why the BMW turbo 4's have been so slept on, but they're able to go toe-to-toe with the EA888 in the Audi's just fine.

I have a 230i with the same transmission, I was curious what you've done to help it support more power; have you had to change the clutch at all and what gearbox oil are you running?

[sqwinny]

Originally Posted by yobo9193

Always love seeing the base engine get some love. Idk why the BMW turbo 4's have been so slept on, but they're able to go toe-to-toe with the EA888 in the Audi's just fine.

I have a 230i with the same transmission, I was curious what you've done to help it support more power; have you had to change the clutch at all and what gearbox oil are you running?

I forgot to add to the various posts.

Stock gearbox
Spec clutch steel single mass flywheel
Spec clutch stage 3+
Redline 75-85 GL4 fluid

[sqwinny]

Proofs it's running. 300 miles on it at the moment. Looking pretty stockish for the time being. No it doesn't sound like a monster or any different as I've received messages about the tone changing and if forging a motor makes it make more power. It might due to the ported head and upgraded valves which allow for more flow + air + thus more fuel is used as result by the DME for proper AFR ratios, but otherwise my guess is its maybe a minor gain.

https://youtube.com/shorts/CHN2OgcMo...f5Po5SRCh-iez_

[sqwinny]

The motor officially has 1400 miles on it. This log share is around 1100 miles or so. Did some test data logs first. Once determined to be safe enough, I did upload this particular log to datazap as it's an off-the-shelf Bootmod3 Stage 2 91 octane tune on it, so no special secrets or special tuning data points are shared via tuner other than the hardware listed below

Please note this is with the "mambatek extreme n20 single scroll turbo" on the car exclusively used for break-in only as the TTE was being rebuilt in the mean time.

Mods at the moment for this log as many of you will want to see the Headgames proven flow improvements from the s55 migrated to the n20/n26 as its the same cylinder head, but just 2 cylinders chopped off.

Custom 4" full downpipe into 3" full exhaust with Active Autoworke 335i muffler
Turbo inlet + Evolution Raceworks charge pipe and boost pipe
Evolution Raceworks intercooler
Afe power magnum stage 2 intake
Bimmermilvs stage 3
Stock spark plugs gapped to 0.022
Stock eldor coil packs
Stock n20 fuel injectors
B58tu hpfp (on car but doesn't add power)
Mambatek extreme n20 single scroll turbo
Turbosmart Recirculating Diverter Valve upgrade

turbo specs for mambatek "n20 extreme"

Turbine Housing Size Est around 0.5 A/R
Compressor Housing Size Unknown
Compressor Wheel Size 49.6/61 mm 6+6 Blade
Turbine Wheel Size 45.65/52 mm 9 Blade

https://datazap.me/u/sqwinnnny/sqwin...g?log=0&data=6

Data log is clean, STFT will show DME is adding fuel as it should do vs the stock cylinder head as there is quite a difference in amount of additional air flow from Headgames pocket ported head + Headgames valvetrain + Bimmermilvs v3 (intake lift is increased from 9.9 -> 10.9 and adds around 3 degrees more duration on the intake camshaft).

Powerband peaks around 6500 which is expected with a larger AR ratio turbo compressor (.41 -> .45-.5 estimated and larger ar ratios usually shift power band to the right) and the Bimmermilvs allowing the n20 to hold its power band drastically past the stock turbo 5900 or so.

MAF shows to peak on this off the shelf tune at 6500 rpm and at around 35.8 lb/min air flow (max reading of n20 MAF, F30 n55 MAF is a direct fit with wire position 3 from n20 migrated to position 4 on the n55 pigtail, however does not scale properly on n20 thus isn't a proper retrofit for higher MAF readings. this is a BM3 limitation within their tuning software).

In theory on 91-93 octane gas this log is estimated to be around 325-335 whp with an off the shelf map based on historical numbers. Needless to say there is probably a good 10-20whp (I am estimating with a hunch from previous historical data) left in the turbo for this fuel of 93 octane tuned for 91 trim levels as car is demanding more fuel and the OTS map as much as it looks clean, there is always room for improvement from BM3 OTS n20 maps regardless of the what is available for the n55/b58 with the stage 2+ map options.

Please note this turbo is no longer on the car as I write this post, thus I won't be able to share any additional data points on it.

Hope this holds you over as I am on travel for work for the next couple of weeks.

For comparison this log is another n20 (not mine) which has all the same mods (inlet, intake, intercooler, charge and boost pipe, downpipe converted to 3", straight pipe from downpipe) above minus Milvs v3 and is a TTE400 turbo on the bootmod3 its stage 2 93 map

turbo specs - TTE400
Turbine Housing Size 6CM2 or 0.41 A/R
Compressor Housing Size Unknown
Compressor Wheel Size 51/67 mm 6+6 Blade
Turbine Wheel Size 45.65/52 mm 9 Blade

https://datazap.me/u/sqwinnnny/fbo-t...2?log=0&data=6

Cheers.

Some bonus turbo data:

Known Turbo Data points on 93 octane with custom tune

Stock turbo size:
TD04-06R
ar ratio .41 twin scroll | compressor wheel: 42/56mm 6+6. turbine wheel 41.2/7.2mm 11 blade - usually maxes out flow around 32-33 lb/min

MHI Turbo Data points on 93 octane
ar ratio .41 twin scroll | compressor wheel 47/58mm 6+6. turbine wheel 41/47mm turbine 11 blade - usually maxes out flow around 33-35 lb/min

Pure Stage 2 Data points on 93 octane
ar ratio .41 twin scroll | compressor wheel 47/58mm 6+6. turbine wheel 45.65/52mm turbine 11 blade - usually maxes out flow around 34-36 lb/min

Mambatek extreme single scroll turbo size:
ar ratio .45-.5 estimated single scroll | compressor wheel 49/61mm | turbine wheel 45.65/52mm 9 blade typically maxes flow around 33-36 lb/min

TTE400 turbo size:
ar ratio .41 twin scroll | compressor wheel 51/67mm turbine wheel 45.65/52mm 9 blade typically maxes out flow around 35-37 lb/min

edit - please note the turbo flow numbers listed above are typical flow rates after a custom tune. These figures are not from an off the shelf map.

[_ObiJon]

I believe I read somewhere that you're going to use the larger manifold and swap to a different compressor. Is that right? If so, what do you think the flow estimations are?

Does it sound different with the new motor?

[sqwinny]

Originally Posted by _ObiJon

I believe I read somewhere that you're going to use the larger manifold and swap to a different compressor. Is that right? If so, what do you think the flow estimations are?

Does it sound different with the new motor?

I did make a custom spec’d turbo with the larger manifold. It’s basically the largest sized td04 turbo you can make before obtaining hardware size limits. It’s not an offering off the shelf from any of the aftermarket turbo manufacturers will offer or make if you request it.

Before I post specs I want to test it for results before I share as my setup is copied nearly all around the globe.
Car doesn’t sound like a spooling diesel anymore with the current setup that’s for sure.

[_ObiJon]

Originally Posted by sqwinny

Car doesn’t sound like a spooling diesel anymore with the current setup that’s for sure.

Haha, that's exactly why I asked.

[AmuroRay]

Originally Posted by sqwinny

I did make a custom spec’d turbo with the larger manifold. It’s basically the largest sized td04 turbo you can make before obtaining hardware size limits. It’s not an offering off the shelf from any of the aftermarket turbo manufacturers will offer or make if you request it.

Before I post specs I want to test it for results before I share as my setup is copied nearly all around the globe.
Car doesn’t sound like a spooling diesel anymore with the current setup that’s for sure.

When is dyno time?

[sqwinny]

Originally Posted by AmuroRay

When is dyno time?

I’ve been traveling for work, finally get back sometime this week (stupid hurricane this week hitting Tampa/Tallahasse impacting return flights).

Will have to do a retune with the setup, but I do believe I will hit full e85 HPFP limits with the b58tu pump unless I migrate to a e50-e60 blend vs full e85.

Have to still order a fx200 + install port injection for the future.

Please note my personal changes on the tte400 makes it a bit bigger and should be able to flow more air in theory.

Also it’s finally happening as the hybrid n20 turbo folks have been actually waiting for is to stop this season, thus I might run that for awhile before my custom full frame turbo setup.

[AmuroRay]

Originally Posted by sqwinny

I’ve been traveling for work, finally get back sometime this week (stupid hurricane this week hitting Tampa/Tallahasse impacting return flights).

Will have to do a retune with the setup, but I do believe I will hit full e85 HPFP limits with the b58tu pump unless I migrate to a e50-e60 blend vs full e85.

Have to still order a fx200 + install port injection for the future.

Please note my personal changes on the tte400 makes it a bit bigger and should be able to flow more air in theory.

Also it’s finally happening as the hybrid n20 turbo folks have been actually waiting for is to stop this season, thus I might run that for awhile before my custom full frame turbo setup.

Oh before I forget, did you ever get a headflow chart when your heads were done?

[sqwinny]

Headgames doesn’t release their before and after headflow numbers. So no official headlfow numbers. If I have to take the cylinder head apart again I might do it just to see the percentage claims but not release raw data at the respect of their work.

Even without a proper tune the engine is happier to rev and be beaten on is what I can say. More than happy to give you a run sometime this season in your n55!

[AmuroRay]

Originally Posted by sqwinny

Headgames doesn’t release their before and after headflow numbers. So no official headlfow numbers. If I have to take the cylinder head apart again I might do it just to see the percentage claims but not release raw data at the respect of their work.

Even without a proper tune the engine is happier to rev and be beaten on is what I can say. More than happy to give you a run sometime this season in your n55!

Let me know if you're ever in my part of town, it will be a great comparison!

[AmuroRay]

I was reading your IG (I don't have IG so I can't see the comments)

But what was the IAT on the MAF readings before and after headwork? I calculated almost 300whp on 93 oct on based on what you posted.

https://atgtraining.com/atg-volumetr...cy-calculator/

[sqwinny]

Originally Posted by AmuroRay

I was reading your IG (I don't have IG so I can't see the comments)

But what was the IAT on the MAF readings before and after headwork? I calculated almost 300whp on 93 oct on based on what you posted.

https://atgtraining.com/atg-volumetric-efficiency-calculator/

I rarely see IAT over 106F to be honest unless I’m super heat soaked doing back to back to back to back to back pulls during a log. I never use these as logs for comparison.

That’s on 93 octane and e85. The 6” ATM intercooler and the evolution raceworks intercooler both work very well.

[sezsol]

Inspirational! Great list of things that could be done, great job!

[sqwinny]

Wanted to post some higher level info here for those looking to max out their n20/n26 or gen 1 b46/b48 turbos. The turbos on these motors use a td04 reverse rotation based turbo.

I did an experiment by swapping turbine wheels to attempt to migrate more exhaust air out of the exhaust.

Stock Turbo Turbine wheel:
9 blade, 46.8mm/41.3mm

Typical "stage 2" turbine wheel upgrade (165g-170g weight) this is the same size turbine wheel in the pure stage 2, tte400, mossleman turbo, just about all "stage 2" hybrid turbo upgrades.
9 blade, 52mm/45.6mm

Xona "knock off" 5+5 turbine wheel "upgrade (135g weight)
5+5 blade, 52mm, 45.6mm

The Xona "knock off" turbine wheel on paper and in hand is lighter + should have the ability to move more air as its a 5+5 setup, aka a 10 blade but in a smaller package, however this turbine wheel in the real world doesn't appear to perform as expected. Turbo doesn't spool quick enough. To give perspective, turbo makes 10psi of boost at 3000 rpm when starting WOT at 2000. For example with my blown TTE400 turbo and stock motor I would make 18-20 psi at 3000rpm on the same fuel for comparison.

Thus recommendations for td04 based turbos with hybrid stock turbo findings is to stick with the standard "stage 2" 9 blade turbine wheel.

Thus my good ol' college try was not successful in this case. Will be swapping back to the standard 9 blade "stage 2" wheel for this sized turbo and ill finally get you folks numbers.