Before and After Dyno Sheets for Downpipe

Dylantm · 07-04-2019, 03:29 PM

What's up guys.

Will be dropping off my 15 328i Xdrive on July 12th to get some dynos done.

Current mods: Intercooler, chargepiping, air intake, turbo inlet pipe and oil catch.

I will be getting a baseline dyno. Then we will be installing a catless downpipe to see the results/gains.

But then after that we will be installing a downpipe with a 200 cell high flow cat to see what the effects are.

***Update results posted on July 16th***

pierreye · 07-05-2019, 02:00 AM

Cool. Interested to see the outcome. Which ECU tuning you would be using or just stock ECU?

Dylantm · 07-05-2019, 08:29 AM

Quote:

Originally Posted by pierreye

Cool. Interested to see the outcome. Which ECU tuning you would be using or just stock ECU?

No tune as of now. I will eventually be going BM3 but that's still a few months down the line.

andino · 07-05-2019, 11:48 AM

Which downpipe are you installing that has a 300 cell HFC? I don't recall seeing any with a 300 cell, just 200 cell ones. Looking forward to some dyno numbers!

Dylantm · 07-05-2019, 12:12 PM

Quote:

Originally Posted by andino

Which downpipe are you installing that has a 300 cell HFC? I don't recall seeing any with a 300 cell, just 200 cell ones. Looking forward to some dyno numbers!

My apologies, I misspoke. it is a 200 cell. I am fabricating a Magnaflow 59929 high flow cat with VBand flanges to replace the original 2.25 connection that meets the mid pipe.

Credit to CandyRedRC46 for this photo....but something like this....

NicksN20F30 · 07-05-2019, 01:43 PM

From what I've heard about most turbo vehicles, even non-BMW's, is that a high flow/ catless downpipe with no tune will make minimal power increases. I'm interested to see what kind of gains their will be over stock with the catless and 200 cell.

GreenF30N26 · 07-05-2019, 05:32 PM

If it’s an N26 you should see large gains over 5500rpm due to the lower cell cats. 900 down to 200 which should be slightly better than the N20. I’m running this setup now with no tune so definitely interested to see numbers. Looking forward to it.

rjd_F30 · 07-05-2019, 07:00 PM

I agree with NicksN20F30, the power gains will be pretty minimal with just the DP and no tune. Interested to see how it goes anyway though! Looking forward to the results.

CandyRedRC46 · 07-08-2019, 10:56 AM

Quote:

Originally Posted by Dylantm

My apologies, I misspoke. it is a 200 cell. I am fabricating a Magnaflow 59929 high flow cat with VBand flanges to replace the original 2.25 connection that meets the mid pipe.

Credit to CandyRedRC46 for this photo....but something like this....

Nice

I wouldn't be surprised if you picked up more power than you lost, while going from a 2.25" pipe to a 3" high flow cat.

jaysal555 · 07-16-2019, 08:09 PM

Any update?

RMachuca3d · 07-16-2019, 09:14 PM

Going by a post on fb, catless gained a lot of tq earlier but once it reaches the tq/hp targets it stayed within stock numbers

Dylantm · 07-16-2019, 09:55 PM

Alright guys. I love science experiments. N20 with Xdrive. And with that said...I am pleased with my results. A couple of people on Facebook implied that I posted this because I was complaining. this was just simply an experiment.

Mods: Air intake, FTP turbo inlet, treadstone charge piping, GPlus intercooler, custom oil catch, stock tune.

Black plot is stock downpipe. Red is catless. As you can see the vehicle made about 70ftlb more torque in the 2500rpm range. But I lost HP overall.

Conclusion: the N20 (as well as the N55) has a target load. Modifications will help you get to that target quicker but once it achieves that load the engine has done its job, therefore no serious power increases in the higher RPM range on a stock tune.

ALSO, I will be going catted downpipe to compare. At the end of the day I believe a catted downpipe will have no serious damper on performance.

rjd_F30 · 07-17-2019, 04:25 AM

Quote:

Originally Posted by Dylantm

Alright guys. I love science experiments. N20 with Xdrive. And with that said...I am pleased with my results. A couple of people on Facebook implied that I posted this because I was complaining. this was just simply an experiment.

Mods: Air intake, FTP turbo inlet, treadstone charge piping, GPlus intercooler, custom oil catch, stock tune.

Black plot is stock downpipe. Red is catless. As you can see the vehicle made about 70ftlb more torque in the 2500rpm range. But I lost HP overall.

Conclusion: the N20 (as well as the N55) has a target load. Modifications will help you get to that target quicker but once it achieves that load the engine has done its job, therefore no serious power increases in the higher RPM range on a stock tune.

ALSO, I will be going catted downpipe to compare. At the end of the day I believe a catted downpipe will have no serious damper on performance.

Nice, thanks for posting. Good results for a car on the stock tune. You should be up around 280whp when it's tuned.

natesi · 07-17-2019, 11:38 PM

Interesting thread! Subscribing -- please keep us posted.

07-04-2019, 03:29 PM	#1
Dylantm Private 50 Rep 50 Posts Drives: 2015 BMW 328i Xdrive Msport Join Date: Oct 2018 Location: Cincinnati iTrader: (0)	Before and After Dyno Sheets for Downpipe What's up guys. Will be dropping off my 15 328i Xdrive on July 12th to get some dynos done. Current mods: Intercooler, chargepiping, air intake, turbo inlet pipe and oil catch. I will be getting a baseline dyno. Then we will be installing a catless downpipe to see the results/gains. But then after that we will be installing a downpipe with a 200 cell high flow cat to see what the effects are. *Update results posted on July 16th* Last edited by Dylantm; 07-17-2019 at 05:57 PM..
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07-05-2019, 02:00 AM	#2
pierreye Lieutenant 212 Rep 500 Posts Drives: F10 & G01 Join Date: Jun 2018 Location: Malaysia iTrader: (0)	Cool. Interested to see the outcome. Which ECU tuning you would be using or just stock ECU?
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07-05-2019, 11:48 AM	#4
andino Captain 480 Rep 681 Posts Drives: F31 328i xdrive Join Date: Jan 2019 Location: norcal iTrader: (2)	Which downpipe are you installing that has a 300 cell HFC? I don't recall seeing any with a 300 cell, just 200 cell ones. Looking forward to some dyno numbers! __________________ 2016 328ix F31 - SOLD! 2006 997.1 C4S
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07-05-2019, 01:43 PM	#6
NicksN20F30 Private 68 Rep 96 Posts Drives: 2013 BMW 328i xDrive Join Date: Feb 2018 Location: New Jersey iTrader: (0) Garage List 2013 BMW 328i Xdrive [0.00]	From what I've heard about most turbo vehicles, even non-BMW's, is that a high flow/ catless downpipe with no tune will make minimal power increases. I'm interested to see what kind of gains their will be over stock with the catless and 200 cell. __________________ 2013 BMW 328i xDrive Bootmod3 stg. 2 FBO
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07-05-2019, 05:32 PM	#7
GreenF30N26 Lieutenant 153 Rep 414 Posts Drives: F30 328ix N26 Join Date: Mar 2019 Location: canada iTrader: (0)	If it’s an N26 you should see large gains over 5500rpm due to the lower cell cats. 900 down to 200 which should be slightly better than the N20. I’m running this setup now with no tune so definitely interested to see numbers. Looking forward to it.
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07-05-2019, 07:00 PM	#8
rjd_F30 Brigadier General 2000 Rep 3,679 Posts Drives: 2013 335i 6MT Join Date: Jun 2017 Location: New Jersey iTrader: (0)	I agree with NicksN20F30, the power gains will be pretty minimal with just the DP and no tune. Interested to see how it goes anyway though! Looking forward to the results. __________________ Instagram: rjd_f30 \| Current: EBII 2013 335i 6MT RWD & Sprint Blue 2008 Audi RS4 \| Retired: 2013 328i, 2000 XTerra, 2022 Civic Si \|
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07-16-2019, 08:09 PM	#10
jaysal555 Private 27 Rep 62 Posts Drives: 2015 428i SULEV Join Date: Apr 2018 Location: Orlando iTrader: (0)	Any update?
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07-16-2019, 09:14 PM	#11
RMachuca3d Captain 724 Rep 943 Posts Drives: F30 328i Msport Join Date: Aug 2018 Location: WA iTrader: (2) Garage List 2015 BMW 328i Mspor ... [0.00]	Going by a post on fb, catless gained a lot of tq earlier but once it reaches the tq/hp targets it stayed within stock numbers
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07-16-2019, 09:55 PM	#12
Dylantm Private 50 Rep 50 Posts Drives: 2015 BMW 328i Xdrive Msport Join Date: Oct 2018 Location: Cincinnati iTrader: (0)	Alright guys. I love science experiments. N20 with Xdrive. And with that said...I am pleased with my results. A couple of people on Facebook implied that I posted this because I was complaining. this was just simply an experiment. Mods: Air intake, FTP turbo inlet, treadstone charge piping, GPlus intercooler, custom oil catch, stock tune. Black plot is stock downpipe. Red is catless. As you can see the vehicle made about 70ftlb more torque in the 2500rpm range. But I lost HP overall. Conclusion: the N20 (as well as the N55) has a target load. Modifications will help you get to that target quicker but once it achieves that load the engine has done its job, therefore no serious power increases in the higher RPM range on a stock tune. ALSO, I will be going catted downpipe to compare. At the end of the day I believe a catted downpipe will have no serious damper on performance. Attached Images
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07-17-2019, 11:38 PM	#14
natesi Lieutenant 204 Rep 499 Posts Drives: F30 Join Date: Jun 2016 Location: PNW iTrader: (0)	Interesting thread! Subscribing -- please keep us posted.
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