Horse Power

[aceduce1604]

With changes in the exhaust and air filters what kind of horsepower can we increase our cars to ?

 

[Sleepr24]

With changes in the exhaust and air filters what kind of horsepower can we increase our cars to ?

In short, not a lot. I have done a relatively large amount of mods to my 2011 3.8 and even though I can tell you I have significantly increased throttle response and the "fun factor" of driving the car, HP and TQ gains are pretty small for the amount of money I have dropped experimenting. Now, there is supposedly a BTR tune and I believe if there are gains to be had that would be the missing piece to the puzzle. I plan on trying that tune out after I do a couple more smaller things first and see if the tune can make better use of the mods I have done. Other than that, you are looking at dropping 10+ grand in a custom twin turbo setup and all that comes with it.

 

[dmitriylm]

It's hard to say precisely because you would need to take a factory stock car, put it on a dyno to get a baseline and then put it on the same dyno (preferably with similar atmospheric conditions) after the mods have been installed. Comparing results from two different dynos or different cars on different dynos simply isn't accurate.

That said, my guess is that a 4.6 V8 with a proper CAI, test pipes and exhaust work will gain roughly 25whp over a stock car before we take ECU tuning into account. A lot of the stock 4.6 dynos that I've seen have put down about 290whp and BTR's baseline dyno for a car with intake/test pipe/exhaust is 325whp. Again, we can't accurately compare the two dynos as they are different dynos, different atmospheric conditions and different cars but its not unreasonable to assume a 25whp gain with those mods. A 4.6 V8 with bolt ons and an ECU tune will achieve further gains and the dyno I've seen shows meaningful gains throughout the RPM range along with a nice thick torque increase in the low and mid range. Between boltons and ECU tune I'd say a 40-50whp increase isn't unreasonable with the torque increase being the biggest benefit.

 

[Huddleston]

probably not enough to really notice a difference. without solid ECU tuning the car simply wont perform leaps and bounds better. it will sound better though

 

[homeofstone]

probably not enough to really notice a difference. without solid ECU tuning the car simply wont perform leaps and bounds better. it will sound better though

+1 plus changing the air filter system is really not worth it. ECU maybe.

 

[Unevakno]

I have a 5.0 R spec with a Magnaflow exhaust, secondary cat delete and K/N drop in with air box flapper mod and I noticed a tremendous difference. Not just sound but performance. The car is much more responsive and very noticeable gains in the high end of the rpm band. I raced a stock R spec / a 2015 5.0 and it was no problem pulling away. The stock exhaust is very restrictive. The mufflers are very large and heavy.

 

[scottdk]

Most reputable engine builders and car enthusiasts would say a CAI is not only a waste of money, but a loss in power. This is one example, but the WWW is filled with many more experienced people stating the same. Another example is Mighty Car Mods. They debunked the CIA in the 2nd link. I get the need for wanting to tinker with a car, but nothing is worth losing performance over. This goes for boosted engines and also N/A.

https://www.youtube.com/watch?v=oyeotHRZ-XI

https://www.youtube.com/watch?v=gCi2yo4UqPI

 

[Sleepr24]

Most reputable engine builders and car enthusiasts would say a CAI is not only a waste of money, but a loss in power. This is one example, but the WWW is filled with many more experienced people stating the same. Another example is Mighty Car Mods. They debunked the CIA in the 2nd link. I get the need for wanting to tinker with a car, but nothing is worth losing performance over. This goes for boosted engines and also N/A.

https://www.youtube.com/watch?v=oyeotHRZ-XI

https://www.youtube.com/watch?v=gCi2yo4UqPI

I think videos and "tests" like this are very disingenuous and overreaching. They do a ad hoc experiment on one car and make a wide ranging conclusion about all CAI's on every car with every setup. If you look at their experiment, they actually disprove their own conclusion by proving the concept that more air into the chamber results in more power (albiet in this particular case not much). However, there are proven aftermarket CAI's that produce significant power increases (such as ones provided by needswings).

 

[scottdk]

I think videos and "tests" like this are very disingenuous and overreaching. They do a ad hoc experiment on one car and make a wide ranging conclusion about all CAI's on every car with every setup. If you look at their experiment, they actually disprove their own conclusion by proving the concept that more air into the chamber results in more power (albiet in this particular case not much). However, there are proven aftermarket CAI's that produce significant power increases (such as ones provided by needswings).

They have decades of experience. I won't argue their findings...Again, the video's I posted are a small findings of what is available. I've done the CAI thing on many cars and I can attest that they do not add power in a modern vehicle in most circumstances. But they sure sound cool right? That theatrics sells.

 

[dmitriylm]

I believe that a well designed aftermarket intake can improve top end performance and with an ECU tune can provide improvements throughout the rpm range.

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[Sleepr24]

I believe that a well designed aftermarket intake can improve top end performance and with an ECU tune can provide improvements throughout the rpm range.

You are 100% correct. I can attest to this as well as any experienced car enthusiast. I can't stand people who just believe anything they see just because they believe someone is "experienced". Do your own research, try things yourself, and think logically about alleged conclusions. CAI's can and do increase HP\TQ and other non measurable such as throttle response in SOME cars with certain setups including modern cars. Obviously if you do nothing to change your fuel\air ratios on a modern car then having increased airflow or colder\denser air will mostly likely be corrected by the cars ecu stock tune to stay within stock parameters at best and possibly hurt performance at worst. This scenario is all that video tested which is why its wide ranging claims are disingenuous.

 

[aceduce1604]

I have a 5.0 R spec with a Magnaflow exhaust, secondary cat delete and K/N drop in with air box flapper mod and I noticed a tremendous difference. Not just sound but performance. The car is much more responsive and very noticeable gains in the high end of the rpm band. I raced a stock R spec / a 2015 5.0 and it was no problem pulling away. The stock exhaust is very restrictive. The mufflers are very large and heavy.

Is the car loud with the magaflows?

 

[NSXNEXT]

Loud? No
Drone? Yes ~ 2500 rpms
I ended up selling my Magnaflow exhaust as it really ruined driving experience. This was on a 2013 RSpec.

 

[dmitriylm]

Loud? No
Drone? Yes ~ 2500 rpms
I ended up selling my Magnaflow exhaust as it really ruined driving experience. This was on a 2013 RSpec.

I can generally tolerate a good amount of volume but the drone is what kills me. It's miserable on anything more than a short drive.

 

[LIRspecSedan]

I have a 5.0 R spec with a Magnaflow exhaust, secondary cat delete and K/N drop in with air box flapper mod and I noticed a tremendous difference. Not just sound but performance. The car is much more responsive and very noticeable gains in the high end of the rpm band. I raced a stock R spec / a 2015 5.0 and it was no problem pulling away. The stock exhaust is very restrictive. The mufflers are very large and heavy.

2nd this setup. i drove from NY to ohio and bacl. punked an infinity who wanted to play deep into tripple digits. occasional drone when letting off throttle in traffic. very pleasurable other times. if you like regular spirited (non tripple digits) driving, you will mot be disappointed

 

[scottdk]

Loud? No
Drone? Yes ~ 2500 rpms
I ended up selling my Magnaflow exhaust as it really ruined driving experience. This was on a 2013 RSpec.

I truly believe with the MagnaFlow X pipe muffler installed in conjunction with the Mag catback exhaust you would have loved the experience. I've modified my exhaust numerous times in order to rid drone. Right now, my exhaust is pretty damn good with minimum drone. Before the X pipe muffler my exhaust was a bit annoying. Plus I think my exhaust sounds better with the X pipe muffler too.

 

[427435]

We all would like to believe that a few simple bolt-on changes will make a big difference in power. Most of them, like a CAE, just make for more noise which seems to satisfy a lot of people.

And there are lots of businessmen/shysters that make their living off that principle.

 

[Unevakno]

Is the car loud with the magaflows?

No the exhaust is not loud it actually has a very nice European tone with little or no drone. I had my exhaust custom fabricated with the factory resonator remaining. I took it off and put it back due to drone. It is a straight thru H-pipe design that flows well.

 

[Sleepr24]

No the exhaust is not loud it actually has a very nice European tone with little or no drone. I had my exhaust custom fabricated with the factory resonator remaining. I took it off and put it back due to drone. It is a straight thru H-pipe design that flows well.

I went a similar route as you but I kept the res deleted.

 

[Buford T Justice]

I would like to see if the stock HP numbers are even what Hyundai said they are.
I'd be surprised if my 3.8 was actually making 333 hp.