Dyno Run: 128i without resonator & secondary cat

[andrey_gta]

Had a chance to dyno my car for the first time.

This is with my exhaust from Pushkin & stock everything else
The exhaust is 3" straight pipe into 135i muffler. Should be equal to a n55 midpipe & 135i muffler fitted to n52 exhaust manifold

It was a hot day,but compares to be about 10 Whp below an e90 328 Xi that has AA tune and DISA manifold.

Im putting down about 210 Whp for 91 Octane
Temperature: 27-28 °C at noon outdoors, 50% humidity, perhaps warmer indoors
Enjoy the graph and data. STD Smoothing 5



UPDATE Jan 2013
Dyno with DISA & No Tune!!!!
Same as before: no secondary car & no resonator exhaust into 135i stock muffler
DISCLAMER: Using 94 Octane from PetroCanada, 17" Winter wheels, 225 tyres

Temperature: 10:30AM -3 °C& 80% humidity outside, perhaps around 5 °C indoors

STD:


SAE:

[Bimmer-Bob]

That seems really good for just the exhaust. I'm thinking the engine might be a little underrated? Assuming a 15% drivetrain loss (which is a big assumption, I guess, but I always hear people throwing that number around) you're sitting north of 245 BHP. Not bad at all.

[andrey_gta]

Thats why I said WHP, I am not sure of the drive train loss, and I have no Baseline of bone stock

[Bimmer-Bob]

Originally Posted by andrey_gta

Thats why I said WHP, I am not sure of the drive train loss, and I have no Baseline of bone stock

Someone dynoed a stock 128i 6MT here a couple of months back and got 197-199 WHP. I know it's not the same car, same dyno, or same conditions, but it's the only thing out there that I know of that you can compare to.

[andrey_gta]

Everyone grab your Sawz-all and go happy on the Cats !!

Sucks that the cats are sitting in a really bad turn and thus hard to weld around compared to e90

[TheSt|G]

I would focus on the primary cats instead. Secondaries are only a 200-400 cell, much like a race cat, and won't yield as much.

[Greenkirby21]

wow looks great!

[i128]

do you feel the difference on the road?

[andrey_gta]

Originally Posted by i128

do you feel the difference on the road?

I did since it was installed. Car feels like it breathes better, sort of like running down hill.
With the dyno, I can now point out why:
Notice the Tourque in the low end is higher by about 10 vs 128i/328i stock dyno and the shape of the power band/HP is Convex vs Linear

[Evice]

This is a great addition to my Dyno post. Mine was completely stock. Thanks for sharing!

http://www.1addicts.com/forums/showthread.php?t=692966

[andrey_gta]

Originally Posted by Evice

This is a great addition to my Dyno post. Mine was completely stock. Thanks for sharing!

http://www.1addicts.com/forums/showthread.php?t=692966

I was looking at yours, do you have a better image?
I need to see the headings to make sure I have the right scale to make it comparable. There are 2 smoothing choices STD and SVA

[flinchy]

So 128i's are putting down 200-210whp (156kilowatts) - gives me hope for 230-235 in the 130i, can't wait to get a stock dyno

[Greenkirby21]

heres my POS dyno! Done on dynojet as well.

Intake + exhaust. Biggest waste of $$(80 dollars) because the guys didn't know how to dyno my car : |. They somehow put my car into limp mode(engine overheated). Turns out they didn't use a fan and just did the dyno outside in the dry 108 texas weather.

They also only gave me only my best run. I asked for all of them(they did 3), and they wanted to charge me extra.

[Evice]

Originally Posted by andrey_gta

I was looking at yours, do you have a better image?
I need to see the headings to make sure I have the right scale to make it comparable. There are 2 smoothing choices STD and SVA

My Smoothing says CF: SAE Smoothing: 5 on right upper corner.

As far as I read from another forum "STD is Another power correction standard determined by the SAE. Power is corrected to reference conditions of 29.92 InHg (103.3 kPa) of dry air and 60 F (15.5°C). Because the reference conditions include higher pressure and cooler air than the SAE standard, these corrected power numbers will always be about 4 % higher than the SAE power numbers. Friction torque is handled in the same way as in the SAE standard.""

So if mine was STD, it would be 198x1.04= 205.92 HP...So looks like you have roughly +5 HP?

[andrey_gta]

]

Originally Posted by Evice

My Smoothing says CF: SAE Smoothing: 5 on right upper corner.

As far as I read from another forum "STD is Another power correction standard determined by the SAE. Power is corrected to reference conditions of 29.92 InHg (103.3 kPa) of dry air and 60 F (15.5°C). Because the reference conditions include higher pressure and cooler air than the SAE standard, these corrected power numbers will always be about 4 % higher than the SAE power numbers. Friction torque is handled in the same way as in the SAE standard.""

So if mine was STD, it would be 198x1.04= 205.92 HP...So looks like you have roughly +5 HP?

I think so

here is my data in SAE
+10 wTQ and +5 whp over your stock dyno. Sadly we cant compare much due to temperature and dyno variance

[Evice]

This tells me that, we need advanced timing/different cams to really use that exhaust.. 5whp is really low for that large diameter exhaust... himms himmss

[flinchy]

Originally Posted by Evice

This tells me that, we need advanced timing/different cams to really use that exhaust.. 5whp is really low for that large diameter exhaust... himms himmss

huh? he put down 210 on a h0t day with no other real mods, that's +10 or more with presumably stock secondary cats, and stock header with primary cats. that's a SOLID gain

and he never got a baseline dyno, for al we know it could be +15whp on his car
ED: and a stock 135i mufler isn't 3" ID, so it's effectively maybe a 2.5" exhaust, going 3" piping is a waste when it's restricted anyway

so since the standard replacement for the n52 seems to actually be 2.75-3" all the way through, this isn't even a full large diameter exhaust

expect actually few more hp with a proper sized muffler (haha, i'm usually theone saying that mufflers don't do anything! :P)

replace the muffler, new headers with larger/no secondaries, i can't see why another 15-20 wouldn't be seen.

[andrey_gta]

The 135i muffler is cut, so that 3" goes as far as possible, similar to 128i BMP exhaust. In any case, I like it cuz I get the flap working to quiet things down.

I think if one wants best gains its to cut up a riss racing full exhaust to fit 128i manifold.

[flinchy]

Originally Posted by andrey_gta

The 135i muffler is cut, so that 3" goes as far as possible, similar to 128i BMP exhaust. In any case, I like it cuz I get the flap working to quiet things down.

I think if one wants best gains its to cut up a riss racing full exhaust to fit 128i manifold.

Cut? You still can't change the inner diameter of the piping above stock except for the very inlet pipe to the muffler - the inner workings of the muffler would be restrictive unless you took a stick to it

What's the volume difference between flap and no flap? I bought my 130 with the golf tee mod done and it sounds amazeballs, i have no idea what it's like with the flap haha

Best gains would actually be a 3" in out straight through style muffler (nice and cheap) probably sound ok as the natural exhaust note is great.. Or a muffler delete (loud and super raspy)

Im curious about your exact setup? Is it a merge at the stock mufflers into a single 3" straight pipe? Or two smaller pipes merging to a 3" axelback?

I'd like to hear twin 2" into a 3" merge with a replacement res+muffler personally

The one i'm looking at is i think twin 1.75" (or maybe 2") merging to 2.75"

It's either going to be that or twin 2" pipes merging to 3" custom done
But i want the 2.75 because it makes it sound super exotic and amazing.. So i need to hear the custom one first lol

[andrey_gta]

130i might be different , but Golf tee mod for me added some annoying drone in 128i. I am not sure of volume, but it opens up quickly, so the loss is minimal if any.

Riss racing is a 3" single pipe, easy to adapt to 128i. for 130i maybe you need a custom approach or use a e82 mid pipe from any source( n55, riss racing) and 130i muffler

For more details of the set up that i got, please look up user Pushkin and his My 128i thread. He has the details there.

[flinchy]

Originally Posted by andrey_gta

130i might be different , but Golf tee mod for me added some annoying drone in 128i. I am not sure of volume, but it opens up quickly, so the loss is minimal if any.

Riss racing is a 3" single pipe, easy to adapt to 128i. for 130i maybe you need a custom approach or use a e82 mid pipe from any source( n55, riss racing) and 130i muffler

For more details of the set up that i got, please look up user Pushkin and his My 128i thread. He has the details there.

Fyi 130i exhaust pipe and routing is identical to 128/330 etc - not even a little drone for me, but i have a fully open hatch layout, different resonance lol , is audible but not LOUD inside

Ok cool ty ill check out that thread

[Evice]

Originally Posted by flinchy

huh? he put down 210 on a h0t day with no other real mods, that's +10 or more with presumably stock secondary cats, and stock header with primary cats. that's a SOLID gain

and he never got a baseline dyno, for al we know it could be +15whp on his car
ED: and a stock 135i mufler isn't 3" ID, so it's effectively maybe a 2.5" exhaust, going 3" piping is a waste when it's restricted anyway

so since the standard replacement for the n52 seems to actually be 2.75-3" all the way through, this isn't even a full large diameter exhaust

expect actually few more hp with a proper sized muffler (haha, i'm usually theone saying that mufflers don't do anything! :P)

replace the muffler, new headers with larger/no secondaries, i can't see why another 15-20 wouldn't be seen.

Blah blah blah.....No it is not. +5-6HP compared to my bone stock which is may be 1% different than his as baseline, which was on a HOT day as well with 5 pulls... Breathing better, less exhaust restriction isn't helping much, that's what I am saying. It needs to be a complete solution.