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Go Back   TDIClub Forums > VW TDI Discussion Areas > TDI Power Enhancements

TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old May 19th, 2019, 11:44   #1
Johnny97
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TDI(s): 2014 tdi
Default Exhaust

Want a new exhaust to put on my 2014 golf tdi
Any suggestions? Donít really wanna spend more than 300-400 so i know Iím not gonna get a super good one but just went one thatíll sound nice and kinda loud


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Old May 19th, 2019, 18:27   #2
RoseBud68
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Not going to happen...Its a TDI. Spend that money on something better.
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Old May 19th, 2019, 19:56   #3
[486]
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pull the turbo off, just run it with the ports open
they're pretty loud like that
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Old May 20th, 2019, 07:40   #4
Pittdawg
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I got a slightly deeper/better sound on my Q5 after installing a Magnaflow catback. You can switch out your factory muffler for a Magnaflow muffler or other straight through design for hopefully a bit more rumble. The other posters have a point though there is minimal sound increase with stock emissions equipment in place. The slightly louder note is perfect for me though.
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Old May 20th, 2019, 19:27   #5
Mongler98
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the last thing to do to a diesel is the exhaust, it is literally the least bang for the buck and very costly

lets put this into perspective
a $300 to $400 tune will yield MAX results for your $ spent
same cost into exhaust, pointless.

order goes, Tune, nozzles, turbo, supporting mods like pumps, intake runners, larger intercooler, MAP, maf delete, Clutch, brakes, suspension and so on
once you reach the point where your doing head work with a cam and really beefy injection and fuel mods, then, your exhaust will be a much better bang for the buck
The ONLY reason to do the exhaust is due to a turbo swap to make it fit.

SAVE YOUR MONEY
get a tune from malone or Kerma
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Old May 20th, 2019, 21:57   #6
adamss24
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Depends how restrictive the exhaust is, running with no exhaust will net the highest bhp but it will be noisy ! Depending on how you build it it can be a bit louder if using them cheery bombs type of backboxes with a pass trough design, they are meant to accelerate the spent gases into a vortex thus creating higher velocity trough the system. A 2.25'' is more than your engine can handle so look for exhaust systems about that size !
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Old May 21st, 2019, 17:44   #7
Mongler98
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Quote:
Originally Posted by adamss24 View Post
Depends how restrictive the exhaust is, running with no exhaust will net the highest bhp but it will be noisy ! Depending on how you build it it can be a bit louder if using them cheery bombs type of backboxes with a pass trough design, they are meant to accelerate the spent gases into a vortex thus creating higher velocity trough the system. A 2.25'' is more than your engine can handle so look for exhaust systems about that size !
In modified situations, no. for OP, no exhaust does NOT really cause a "real" loss in power. Its a myth that restrictions rob power, well in a manner of speaking they "do" but the measurable HP loss is so small that its negligible as a 3rd dyno pull just from warming up or cooling down car vary, 0.03% and the HP loss is less than that. AKA NOTHING.
dont believe me, well here watch this.
no matter how restrictive you get, you dont really loss much if any power. and this test was on a BIG HP motor.
the ONLY loss you will have is in heat loss, AKA, your EGT's can and defiantly WILL go up, DRASTICALLY if you restrict the exhaust like in the video im going to link here, BUT a stock 2.25 exhaust on a +/- 100 HP motor? NO, not a chance. you could have 5 mufflers on there in the worst baffle config and next to NO power loss other than additional weight will happen.

well after looking for the link, it seems engine maters and road kill got killed from youtube and now you have to pay like a shill, FML
well here is the link anyways. Worth watching
https://www.motortrendondemand.com/d...ts/0_ujj8a8mw/
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Old May 22nd, 2019, 01:53   #8
turbobrick240
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You can absolutely put a restrictive exhaust on that will reduce or limit power output. It's just rarely an issue on tdi's because so few make enough power/gas flow to be limited by the factory setup.
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Old May 22nd, 2019, 04:52   #9
Mongler98
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No, you cant.
These guys literally pinched the header to the point where every runner was only like 1/4 inch wide of an opening. Made the same HP, well almost. But a 8hp drop on a 400+ hp v8 is nothing.
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Old May 22nd, 2019, 05:34   #10
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Ok Mongler. I yield to your superior knowledge of physics and fluid dynamics. Some yahoo made a video, therefore science doesn't apply.
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Old May 22nd, 2019, 08:59   #11
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Quote:
Originally Posted by Mongler98 View Post
No, you cant.
These guys literally pinched the header to the point where every runner was only like 1/4 inch wide of an opening. Made the same HP, well almost. But a 8hp drop on a 400+ hp v8 is nothing.
Like this one https://youtu.be/a_1OVYsLqMU
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Old May 22nd, 2019, 15:42   #12
Yourbuddysatin
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Restrictive exhaust well cut power. I worked on my dads ranger years ago and it had a plugged cat. On a whim I drilled holes in it to see if that would help...low and behold it was like a different truck. Cat would get cherry red from being so restricted. My .02.......
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Old May 22nd, 2019, 21:28   #13
adamss24
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One of the best explanations so far ! To mongler, how comes that running a straight trough exhaust without many turns help flow to the point the diesel engine makes better power as it helps spool the turbo quicker ? Modern diesels with a dpf have turbos designed to run with backpressure in mind, when the dpf cloggs it will slow down the car to the point it will chock itself to death and go nowhere stalling almost imediately ! You dont believe me ? drive a car with a blocked dpf then tell me that getting the exhaust upgraded doesnt makes any difference ! On my 2013 seat exeo 2.0 CR 118Bhp engine i went from a 2.5" exhaust to a full 3" stainless steel system with a motorbike back box at the back and a changed the turbo to bv43a from the 170Bhp model. Same tune in the engine but dpf regenerations was turned off ! The engine went 1L/100Km better on fuel and made extra 25 Bhp as well ! Explain that ?

Last edited by adamss24; May 22nd, 2019 at 21:31.
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Old May 22nd, 2019, 22:36   #14
Mongler98
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i never said a bigger exhaust WONT make more power, it can, and was tested by the same guys, and does, depending on the engine and its config, it DOES make a big difference. My point was that a restrictive exhaust will not rob power, and it wont, EGT's will be HIGH AF and a clogged CAT or DEF parts absolutely will as there is next to NO flow, the argument your all making is that if you shove a potato in a tail pipe it will not run, yes 100% correct, Im clearly saying that a restrictive exhaust aka Mufflers and resonators will not impead performance enough to measure or be worth noting, its been tested up the ARS and proven that even a bent and pinched exhaust will NOT cause power loss measurable to note, but that better performing velocities and baffles WILL improve performance, IF power gains are to be had by other supporting modifications or engine displacement or turbo requirements. you can run 200HP on a 2.25 exhaust all day and be fine. 2.5 sounds better and much of the time its a custom set up anyways so it ends up working better as money was going to be spent either way.


OP wants to jack up his wallet by putting a pointless exhaust on it, thats it, argument made that its pointless to power gains is 100% accurate as nothing else was done
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Old May 23rd, 2019, 02:56   #15
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Dude, why all of the convoluted and nonsensical backpedaling? Just admit what everyone here knows, that exhaust system design and sizing plays an important role in the performance of any ICE.
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