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Discussion Starter · #1 · (Edited)
I have a Twisted Steel downpipe on backorder from aFe.. saw someone on a Facebook group that just had one installed.
He was saying he couldn't feel any appreciable power increase (with stock intake). A claimed 40 ish ft lbs of torque should be a very noticeable increase.
aFe has a dyno-chart up that shows a 36 hp & 43 ft lb increase in power and torque using their aFe intake. Is that realistic without a tune?
FB guys are saying not to expect any power increase without a tune (not doing a tune as I don't want to void my warranty).
Thinking about canceling my order... I'm really not interested in making my car any louder. Looking for throttle response and some more torque out of the turns.
Wadaya think?

Tried to contact aFe with their "contact us button" but it doesn't seem to work. They're closed on the weekend.
 

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If you’re simply looking for those things, then a tune with the stock parts on there might be what you’re looking for. I saw David Chung (LAP3) chastise a group of people for recommending bolt-ons before a tune as the engine may surge and slam (repeatedly) into the torque limiters. I also know the pre-cats are annoyingly restrictive and companies even making DPs with a cat are using much higher flow units. And...Hyundai is a massive corporation and was looking for a given performance target before draping any/all “restrictive” components upon it.

So, you should open up torque to...any kind of limiters in place. :) Maybe those numbers were pulled from lower in the RPM range, where you’ll more than likely feel it anyway. Or it will be a huge pain in the ass for something you won’t truly feel without a couple more parts and a tune. Seems perfectly reasonable to inquire with them.

I’m getting a downpipe for this car just because I know how bad the first catalytic converter can be, and I’d like a little more noise from whichever tune I go with.
 

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2020 VNpp tuned
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Why don't you get the JB4 and just remove it if you need to take it in or use your warranty? It can be removed very easily and without a trace. My shop I use will remove all my mods and put all stock back on if need be for a couple hundred bucks and they claim they have never had someone lose their warranty.
 

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2019 Veloster N PP / MT / Perf Blue.
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Called aFe today, they claim their Dyno results are not with a tune.
aFe Takeda intake and Twisted Steel downpipe only.
I guess I'll find out whenever they decide to ship it.
Did you ever install the DP and Intake from AFE? I also saw their dyno and numbers and the curves looked impressive. You shouldn't have to tune because our cars are MAP sensor and accommodations are made. The numbers always seemed legit to me

How have you liked it?
 

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No tune is required with an aftermarket downpipe. Most hp/whp specs are derived without tunes. Yes, there will be an increase in hp/whp with the installation. This depends mainly on atmospheric and ambient conditions for a given area and dynamometer testing parameters. The OEM ECU and PCM will accommodate the upgrade within the software parameters it was uploaded with from the factory. The aftermarket downpipe deals specifically with engine exhaust pulse and reduced back pressure allowing the exhaust pulse to escape quicker provide the exhaust gases to mover more efficiently from the turbine, which creates more power. Faster spin up and more compressor rpms will be attained in the process.

Tuning generally provides more atmospheric boost, modified trim tables, A/F mixtures and more exact timing. Simply put, provides a broader spectrum of parameters to utilize with the increase of power/torque available.

A MAP Sensor; The MAP sensor converts engine vacuum or manifold pressure to an electrical signal, so the powertrain control module (PCM) knows how much load the engine is under. This data is the basis for fuel delivery and timing control and won't be affected or control any function of the aftermarket downpipe install. Even after a tune, it will have no direct affect on trims or timing. It only reads manifold absolute pressure. No change or adjustment of the MAP is required in any case.
 

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2019 Veloster N PP / MT / Perf Blue.
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No tune is required with an aftermarket downpipe. Most hp/whp specs are derived without tunes. Yes, there will be an increase in hp/whp with the installation. This depends mainly on atmospheric and ambient conditions for a given area and dynamometer testing parameters. The OEM ECU and PCM will accommodate the upgrade within the software parameter. The aftermarket downpipe deals specifically with engine exhaust pulse and reduced back pressure, in which the exhaust pulse to escape quicker allowing it to efficiently move gases away from the turbine which creates more power. Faster spin up and more compressor rpms.

Tuning generally provides more atmospheric boost, modified trim tables and more exact timing. Simply put provides a broader spectrum of parameters to utilize with the increase of power/torque available.

A MAP Sensor; The MAP sensor converts engine vacuum or manifold pressure to an electrical signal, so the powertrain control module (PCM) knows how much load the engine is under. This data is the basis for fuel delivery and timing control and won't be affected or control any function of the aftermarket downpipe install. Even after a tune it will have no direct affect on trims or timing. It only reads manifold absolute pressure. No change or adjustment of the MAP is required in any case.
This is a really good post. Thank you for taking the time.

-JE
 
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