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      08-13-2020, 01:39 PM   #23
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Quote:
Originally Posted by KevM2 View Post
Ya I feel exactly the same way. I used to think BM3 was pretty safe but after some posts here with people blowing their engine with a tune im being a bit of a chicken. Mind you I still think BM3 is pretty damn safe and an issue with it very rare. Other factors may have played an issue in those engines blowing
especially with general feedback and a decade of data about how reliable the engine is, even at 500hp+

of course the forum will both show people with problems and those who did but are saving face/too embarassed to post

I want to delete cold start using BM3, but by then i'll have a license to tune and not be using it!
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      08-14-2020, 03:18 AM   #24
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Originally Posted by 3t3p View Post
This is why I bought the V2 do glad to hear it was a good choice!
I'm doing turbosmart plumback, intercooler (Do88) and forge CP all at once.

Contemplating before and after dynos but not sure I should expect to see anything?
When re-dyno'd my m135i, after fitting ER boost pipes, Pure inlet and Wagner Comp Evo 2 i/cooler, peak gains were small but area under the curve was 25% larger than previous dyno - definitely worth doing IMHO hence why I went a similar route with my M2.
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      08-15-2020, 05:29 AM   #25
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Quote:
Originally Posted by Bee Pee View Post
When re-dyno'd my m135i, after fitting ER boost pipes, Pure inlet and Wagner Comp Evo 2 i/cooler, peak gains were small but area under the curve was 25% larger than previous dyno - definitely worth doing IMHO hence why I went a similar route with my M2.
gonna try and do before/after dyno

Does the car need to adapt to the bolt ons? As the dyno is right next to the garage i'm using to fit the parts. Would it be better to drive with it for a few days first?
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      08-15-2020, 08:07 AM   #26
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Quote:
Originally Posted by 3t3p View Post
gonna try and do before/after dyno

Does the car need to adapt to the bolt ons? As the dyno is right next to the garage i'm using to fit the parts. Would it be better to drive with it for a few days first?
2-3 WOT pulls are enough. Drive it around the block first if you must.
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      08-15-2020, 12:00 PM   #27
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Quote:
Originally Posted by 3t3p View Post
Quote:
Originally Posted by Bee Pee View Post
When re-dyno'd my m135i, after fitting ER boost pipes, Pure inlet and Wagner Comp Evo 2 i/cooler, peak gains were small but area under the curve was 25% larger than previous dyno - definitely worth doing IMHO hence why I went a similar route with my M2.
gonna try and do before/after dyno

Does the car need to adapt to the bolt ons? As the dyno is right next to the garage i'm using to fit the parts. Would it be better to drive with it for a few days first?
Yes - drive it first to let DME learn / adapt then re dyno
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      08-17-2020, 06:30 PM   #28
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Thanks boys I'll razz it round the motorway near the garage then come back!

Can't wait now
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      09-14-2020, 03:14 PM   #29
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Holy shit snacks boys, the mods have been amazing! way better than what the sports cat gives you alone.

The throttle response is incredible, turbo spool is probably around 2-3 times faster in speed it just activates beast mode you're on full boost with the click of the fingers. The car literally feels like it's drinking through a bigger straw.

It feels 20hp faster, didn't have time to do after dynos today as the top screw on the DV took longer than they thought to get out.

Will be dyno'd again wednesday morning.

Stock the car made 412bhp and 442ft/lb on its best run so i'm happy the car is a 400hp car anyway. I'll be really surprised if the graph isn't better or the car isn't making more power on wednesday.



The opposite of turbo lag going with the bigger IC (DO88). car sounds like a DRAGON now is only way I can describe it. The engine actually makes noise and the zorst is throatier.

Highly recommend the MST inlet! Can't wait to get her down a B-road!

Here is the before dyno:

Last edited by 3t3p; 09-14-2020 at 03:21 PM..
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      09-15-2020, 02:14 PM   #30
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Had a look in daylight today, the inlet certainly is chunky, it does rest against some non moving parts, think this will be ok? I suppose if it wears through I would notice/the car throw an error?
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      09-15-2020, 06:11 PM   #31
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Quote:
Originally Posted by 3t3p View Post
Holy shit snacks boys, the mods have been amazing! way better than what the sports cat gives you alone.

The throttle response is incredible, turbo spool is probably around 2-3 times faster in speed it just activates beast mode you're on full boost with the click of the fingers. The car literally feels like it's drinking through a bigger straw.

It feels 20hp faster, didn't have time to do after dynos today as the top screw on the DV took longer than they thought to get out.

Will be dyno'd again wednesday morning.

Stock the car made 412bhp and 442ft/lb on its best run so i'm happy the car is a 400hp car anyway. I'll be really surprised if the graph isn't better or the car isn't making more power on wednesday.



The opposite of turbo lag going with the bigger IC (DO88). car sounds like a DRAGON now is only way I can describe it. The engine actually makes noise and the zorst is throatier.

Highly recommend the MST inlet! Can't wait to get her down a B-road!

Here is the before dyno:
412/442 dyno - what mods fitted to the car ?
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      09-16-2020, 04:41 PM   #32
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Here's the after, made 421hp but look at the high rpm the power is maintained much better till red line. I assume that's what we'd expect with the turbo breathing better?

I checked again today the guy reckoned their dyno is fairly accurate but thinking is my car running a tune lol?

Same tank of fuel used.

Mods are DO88 intercooler, MST turbo inlet V2, forge charge pipe, turbosmart plumback, Milltek sports cat, Tesco Momentum

The throttle response is amazing, the car makes some different sounds internally at times altogether its throatier and more raw sounding in all drive modes. Even comfort now sounds psuedo-exotic.

Hope to get a chance to ring her out on B roads this weekend coming. Not especially sure I need to mess things now with BM3, tho I had wanted to code cold start out.

Pre-intercooler being upgraded three runs were done in quick back to back succession, in fact the third run made the most power. So much for my heatsoak theory, on the dyno at least it didn't display this behaviour.

I have convinced myself I can feel it (heatsoak)on the road in some circumstances however.

Car feels like a big N/A lump now it's lovely.

Last edited by 3t3p; 03-29-2021 at 12:39 PM..
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      09-16-2020, 07:50 PM   #33
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Quote:
Originally Posted by 3t3p View Post


Here's the after, made 421hp but look at the high rpm the power is maintained much better till red line. I assume that's what we'd expect with the turbo breathing better?

I checked again today the guy reckoned their dyno is fairly accurate but thinking is my car running a tune lol?

Same tank of fuel used.

Mods are DO88 intercooler, MST turbo inlet V2, forge charge pipe, turbosmart plumback, Milltek sports cat, Tesco Momentum

The throttle response is amazing, the car makes some different sounds internally at times altogether its throatier and more raw sounding in all drive modes. Even comfort now sounds psuedo-exotic.

Hope to get a chance to ring her out on B roads this weekend coming. Not especially sure I need to mess things now with BM3, tho I had wanted to code cold start out.

Pre-intercooler being upgraded three runs were done in quick back to back succession, in fact the third run made the most power. So much for my heatsoak theory, on the dyno at least it didn't display this behaviour.

I have convinced myself I can feel it on the road in some circumstances however.

Car feels like a big N/A lump now it's lovely.
Can you clarify the mods before and after, please?
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      09-17-2020, 03:48 PM   #34
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ECU is stock throughout. Same tank of fuel. Fairly similar atmospheric conditions on the two days.

Before Milltek 300 cel downpipe.

After as above plus MST turbo inlet V2, DO88 intercooler, forge charge pipe, turbosmart plumback Diverter valve.

Car has BMW major service about six weeks ago.

Last edited by 3t3p; 09-17-2020 at 04:22 PM..
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      09-17-2020, 04:30 PM   #35
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Originally Posted by AmuroRay View Post
Can you clarify the mods before and after, please?
So 412hp with basically just a turbo inlet pipe???
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      09-17-2020, 06:45 PM   #36
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Originally Posted by cecaa850 View Post
So 412hp with basically just a turbo inlet pipe???
No, his baseline was catless downpipe

Then he added a Turbo inlet, intercooler, diverter valve and charge pipe and made 8whp peak, and almost 30whp more at redline. It’s amazing.

I’m so going to invest in those.
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      09-17-2020, 06:47 PM   #37
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Quote:
Originally Posted by 3t3p View Post
ECU is stock throughout. Same tank of fuel. Fairly similar atmospheric conditions on the two days.

Before Milltek 300 cel downpipe.

After as above plus MST turbo inlet V2, DO88 intercooler, forge charge pipe, turbosmart plumback Diverter valve.

Car has BMW major service about six weeks ago.
Awesome, and thank you. Final question, did they provide you with the run files to overlay? This is great information.
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      09-17-2020, 10:12 PM   #38
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The N55 makes ~365 HP stock, and a sport cat DP bumped that up to 412 HP? Seems to be reading a bit high, imo.

But it's about the relative gains, and the after curve looks much better on the top end for sure!

Last edited by eeyang92; 09-17-2020 at 10:42 PM..
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      09-18-2020, 08:38 AM   #39
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Quote:
Originally Posted by eeyang92 View Post
The N55 makes ~365 HP stock, and a sport cat DP bumped that up to 412 HP? Seems to be reading a bit high, imo.

But it's about the relative gains, and the after curve looks much better on the top end for sure!
Stock tune - BEFORE chart - 412HP at the crank/350WHP with just a 300cpi DP seems to indicate an optimistic dyno.

AFTER chart - the change in shape at the top end in is same/similar to what I saw when I added Pure inlet to my M135i n55. Inlet upgrade is definitely worth doing IMHO, peak of +8WHP at +500rpm ie almost at the redline demonstrates stock inlet is bottle-necking comp side of stock n55 turbo.

Oddly, torque curve is worse throughtout 2nd chart as low rpm spike then trough straight afterwards may hint at the car not being tied down/position correctly on the dyno's rollers.

3ptp - Great result as-is - just eyeballing - area under the power curve is roughly +30% whereas torque curve is less. I'd suggest you get the car re-dyno'd on Dyno Dynamics dyno as these tend to more realistic in terms of actual numbers.

BP
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      09-18-2020, 11:40 AM   #40
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Quote:
Originally Posted by Bee Pee View Post
Stock tune - BEFORE chart - 412HP at the crank/350WHP with just a 300cpi DP seems to indicate an optimistic dyno.

AFTER chart - the change in shape at the top end in is same/similar to what I saw when I added Pure inlet to my M135i n55. Inlet upgrade is definitely worth doing IMHO, peak of +8WHP at +500rpm ie almost at the redline demonstrates stock inlet is bottle-necking comp side of stock n55 turbo.

Oddly, torque curve is worse throughtout 2nd chart as low rpm spike then trough straight afterwards may hint at the car not being tied down/position correctly on the dyno's rollers.

3ptp - Great result as-is - just eyeballing - area under the power curve is roughly +30% whereas torque curve is less. I'd suggest you get the car re-dyno'd on Dyno Dynamics dyno as these tend to more realistic in terms of actual numbers.

BP
Yeah, I agree. Although, the wheel HP seems fairly accurate with a sport cat, it's possible whatever equation they're using to compute BHP is off. Normally the drivetrain loss is ~10% for RWD? 412 BHP would make that 17%.

Seems like there's a turbo inlet in my future. MST looks nice although I am worried about KevM2's report of it rubbing against other parts in the engine bay. It seems the new pure inlet now has the flange to prevent it from popping off?
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      09-18-2020, 11:51 AM   #41
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Quote:
Originally Posted by eeyang92 View Post
Quote:
Originally Posted by Bee Pee View Post
Stock tune - BEFORE chart - 412HP at the crank/350WHP with just a 300cpi DP seems to indicate an optimistic dyno.

AFTER chart - the change in shape at the top end in is same/similar to what I saw when I added Pure inlet to my M135i n55. Inlet upgrade is definitely worth doing IMHO, peak of +8WHP at +500rpm ie almost at the redline demonstrates stock inlet is bottle-necking comp side of stock n55 turbo.

Oddly, torque curve is worse throughtout 2nd chart as low rpm spike then trough straight afterwards may hint at the car not being tied down/position correctly on the dyno's rollers.

3ptp - Great result as-is - just eyeballing - area under the power curve is roughly +30% whereas torque curve is less. I'd suggest you get the car re-dyno'd on Dyno Dynamics dyno as these tend to more realistic in terms of actual numbers.

BP
Yeah, I agree. Although, the wheel HP seems fairly accurate with a sport cat, it's possible whatever equation they're using to compute BHP is off. Normally the drivetrain loss is ~10% for RWD? 412 BHP would make that 17%.

Seems like there's a turbo inlet in my future. MST looks nice although I am worried about KevM2's report of it rubbing against other parts in the engine bay. It seems the new pure inlet now has the flange to prevent it from popping off?
DCT RWD - CHP to WHP would be in the 15-18% range

I think the tight clearance of MST inlet can be managed during the installation.

I have CSF FMIC, AFE dry drop in, ER boost pipes, Pure inlet and GFB fb+ cw Fspeed 200 cpi DP with stock tune on Dyno Dynamics dyno it made 340wHP.

So similar range esp as numbers do vary from dyno to dyno. Hence my comment just above getting a run on Dyno Dynamics to verify as dyno type used in the before & after charts posted above aren't specified.
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      09-18-2020, 01:50 PM   #42
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The wheel hp number seem spot on if we are basing it on dynojet numbers. Yes, DynoDyamics dynos read lower, and preferred by a lot of tuners because they are "load based"

Anyhow, all that matters is that the OP did a before and after on the same dyno, same car and even with the same tank of gas. I appreciate you providing us with this infomation.

SeanWRT Have you ever seen high RPM gains on the N55 like this?
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      09-18-2020, 02:05 PM   #43
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Dyno developments was the machine.

I don't know what to think, he reckoned his own car came within 5-10hp on another dyno.

Nice guy but asked about smoothing and didn't know what number they used but that without it it would obviously be a very shaky graph!

Yeh I noticed the torque too, it's a small amount really, he hasn't given me the other graphs to compare, not sure if it's margin of error stuff.
No overlays I'm afraid but a mate (graphic designer) made a funky gif I'm trying to work out.

Trouble is axes aren't like for like with numbers on Y axis (are they ever?) So when he overlayed them (my friend) it was scewed
Either way I'd much rather have it pulling to redline!

My guys are good as you get tbh for BMW specialists in the UK, in terms of mechanical prowess, they're not tuners. They're rebuilding their own race car after it got heavily damaged on track.

To be clear, my mechanic is not the same firm as the dyno firm, but they are next to each other.

Looking at it the MST is a wide boy and nuzzles up against some parts, maybe I'll try some pics over weekend with the DSLR.

Last edited by 3t3p; 09-18-2020 at 02:45 PM..
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      09-18-2020, 03:12 PM   #44
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Quote:
Originally Posted by 3t3p View Post
Dyno developments was the machine.

I don't know what to think, he reckoned his own car came within 5-10hp on another dyno.

Nice guy but asked about smoothing and didn't know what number they used but that without it it would obviously be a very shaky graph!

Yeh I noticed the torque too, it's a small amount really, he hasn't given me the other graphs to compare, not sure if it's margin of error stuff.
No overlays I'm afraid but a mate (graphic designer) made a funky gif I'm trying to work out.

Trouble is axes aren't like for like with numbers on Y axis (are they ever?) So when he overlayed them (my friend) it was scewed
Either way I'd much rather have it pulling to redline!

My guys are good as you get tbh for BMW specialists in the UK, in terms of mechanical prowess, they're not tuners. They're rebuilding their own race car after it got heavily damaged on track.

To be clear, my mechanic is not the same firm as the dyno firm, but they are next to each other.

Looking at it the MST is a wide boy and nuzzles up against some parts, maybe I'll try some pics over weekend with the DSLR.
Appreciate it, thanks!
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