Intake and cat back performance incresases

[Billsgx]

I put a K & N Typhoon cold air intake and a Stillen cat back exhaust on my G37X sedan.
I noticed right after I installed the K & N itake that I lost low end power from idle to about 4,000 rpm.
It seems more sluggish and doggy in that rpm range. I installed the Stillen a few days ago and its the same.
Is this normal? I'm not happy with losing that low end rpm power. The car was snappier before I did the upgrades.
I have not yet done the Uprev tune which I plan on doing in the future.
I am hoping this will make a BIG difference after I do the tune.
Any similar experiences?
Will the tune make a big difference and help with the low end power that I seemed to have lost?

[audtatious]

Hmm...I don't believe I've lost low-end on mine but with all the constant updates I've done it's hard to tell without hitting the drag strip and comparing to stock.

[Billsgx]

It was definately noticeable right away after i put on the K &N intake. Like its bogging down now at lower rpm's.

[audtatious]

Is the intake piping larger or smaller than the factory?

As I added parts I updated the tune on my Cobb AccessPort to coincide with them. Maybe the uprev tune will set things right for you.

[Billsgx]

Not sure. I would have to look and compare.
Im hoping and assuming that the tune will help and make a big difference. After all, thats what its for right?

[audtatious]

That's correct.

[Billsgx]

Tried ordering the Uprev tune online after calling them and asking many questions.
Had no luck. Tried three times with same result. After inputting all of my info and adding to cart it would just say "no items in cart".
Had to call them again and they are having their IT guy look into it and reboot the system.
He said to try again later.
I am starting to think "someone" dosent want me to put upgrades into my car!
I have run into a lot of bumps in the road with almost everything I have done to my car.

[kmckis1029]

not surprised you lost low end... as your exhuast and intake flow more freely now. you high end should be greatly improved... (probably need a higher Rev limiter now too) you should get a tune to get back your low end.

[Billsgx]

Yea, must be getting too much air. My UpRev tune is being delivered today! Cant wait to see what a difference it will make.

[audtatious]

Keep us updated....

[Billsgx]

What I noticed after installing the K & N intake was that it not only lost power in the lower RPM range, but also the RMP's dont climb as quickly either. Like its bogging down.

[Billsgx]

I flashed my ECU today with UpRev's map for my car...I'm happy!
I definatelly notice a difference. Revs quicker and it has more snap in the lower RPM's!
That map was just the map they sent me for my car with my specific mods.
Now I have to save the info. off of the ECU on how the car is running and email it back to them so they can fine tune it and send me the fine tuned map to flash my ECU with that map.
It feels like more power at the wheels at all RPM's.
I like how you can use the cruise controll to switch between maps.
I had three maps loaded. A performance/tune map, economy map and a stock map.
You can easily switch between maps even on the go.

[01 cobra sc]

that's great news, you had me worried. my car in going in for the Stillen HFC' and the Stillen Gen 3 CAI.
look forward to the remap results.

2010 G37x Sedan
Magnaflows,
Motordyne upper manifold,
Chin spoiler,
rear deck spoiler,
Stillen Gen 3 CAI (next week)
Stillen HFC (next week)....

[audtatious]

I flashed my ECU today with UpRev's map for my car...I'm happy!
I definatelly notice a difference. Revs quicker and it has more snap in the lower RPM's!
That map was just the map they sent me for my car with my specific mods.
Now I have to save the info. off of the ECU on how the car is running and email it back to them so they can fine tune it and send me the fine tuned map to flash my ECU with that map.
It feels like more power at the wheels at all RPM's.
I like how you can use the cruise controll to switch between maps.
I had three maps loaded. A performance/tune map, economy map and a stock map.
You can easily switch between maps even on the go.

Good deal. Glad to hear.

Dreading going with cobb AP at this point as they are no longer supporting NA applications.

[EPhilly]

Hey Guys,

First post here on the forums, just bought a 2009 G37X Coupe. I was looking at just a CAI to add some additional power. Not too knowledgeable when it comes to the specifics.. Trying to read and learn so I can understand this baby inside and out.

Any chance someone would give me a quick run down on what I need to do if I installed a CAI? I.E. What is UpRev/Mapping and is this necessary to do if I do not want to run into the same problem discussed by BillsGX?

[joe603]

You do not need to do anything with a CAI. What they are talking about is tuning the car's computer to efficiently use the extra airflow from the intake/exhaust mods. You don't HAVE to tune with such minor modifications. However, when you get into High-Flow CATS, full exhaust, and intake tuning...you can get more HP with a good tune.

For just a CAI, you don't need any of that! Check out some threads on which ones to get...I'd recommend R2C

http://tunerzstore.com/index.php?p=1_89

[EPhilly]

Awesome, thanks joe.

[IPLG13]

First time infinity owner, very happy so far.

I just bought a 13 IPL G...question: would you change the exhaust? If so what would give me the same IPL exhaust look but increase performance? From what I was told the IPL exhaust is only tuned for sound and not performance.

[audtatious]

Catback only you will get minimal gains with an aftermarket exhaust. I'd look at high-flow cats instead and only replace the catback if you want more tone.

Pix of your IPL with CV4's.....??

Thanks and welcome to NICO.

[Hughie]

I am looking to purchase the K & N Typhoon cold air intake, claims it will boost HP by 14.2. However after reading the post and seeing the lost power I am having seconds thoughts. Can someone do a run down on how I have improve the performance of my 2009 Infinti G37x Sedan. I am guessing I would need to go with a cold air intake, performance exhaust, and a tune. Any help suggestions are truly appreciated. This is my first post.

[Billsgx]

Yes, cold air intake, cat back and a tune. I just lost low end power in the lower RPM range after installing the CAI. It was sluggish feeling to about 4,000 RPM. I added the Stillen cat back second and felt about the same in the lower RPM range. After I did a UpRev tune...fixed! It runs great now! Huge difference! I would suggest getting a tune after you are done with all of your bolt on mods. I am considering next summer adding Stillen high flow cats. Not sure yet though. I would have to get my car re tuned after as well.
I have the 09' G37X sedan as well.

[audtatious]

^^^ What Bill said...

Hughie, welcome to NICO

[Hughie]

Bill / Aud,

Thanks for the quick response. I found the CAI at streetsideauto.com for $299. Cheapest anywhere by a mile. Can you point me in the right direction on the exhaust and the tune? Do you simply by something from UpRev which flashes your chip somehow? Does the tune have to be done with the car on a dyno?

Hughie

[Billsgx]

For the exhaust you could go with a Stillen from their website or an ARC. You can check out the ARC at http://www.TunerzStore.com. Both are going to run over a grand. There are a few other options as well. As for the tune check out http://www.uprev.com. They have all of the info. on their website you need. There are a few options depending on how you want to do it. No, you do not need to bring the car to a certified UpRev shop to get the tune done. It will cost around $500.00 but that depends somewhat on which option you choose.
If you want to do a tire and wheel package check out www.tirerack.com.

[Racer G]

What's up guys? Just traded in my 2004 BMW 645ci for a 2008 g37. Very impressed with that crazy V6. (had a 2003 350z too) and cannot wait to get all the horseys out of it. I am going to order the RC2 intake. I like the dyno'd HP gains. Any other suggestions? I was at Stillen today looking at exhuast... too expensive! Has anyone here put on a flowmaster 2 or 3 chamber on one of these? I had one on a 3000gt once and sounded unbelievable. decent HP gains too. Thanks for any suggestions!

[Racer G]

oh yeah... BillsGX.... One thing i had happen with a K&N before is... they come with a lot of oil on them. When the oil gets sucked in it can collect on the MAF thus giving off wrong readings. It happened to my Tacoma and it bogged real bad. I cleaned the sensor and then it ran great... Just a thought.

[audtatious]

Welcome aboard Racer G

I have not seen any flowmaster exhaust systems for the G37. You would have to build you own.

[Billsgx]

Racer G -
If you like Magnaflow they make one for the coupe only. You can fingd them cheap on Amazon. The fitment charts say they will fit both the coupe and sedan. They are wrong. I found out the hard way! You can get one to your door for $710.00. You can get an Invidia for $910.00 to your door. Most anything else you can expect to pay over a grand.

[Billsgx]

oh yeah... BillsGX.... One thing i had happen with a K&N before is... they come with a lot of oil on them. When the oil gets sucked in it can collect on the MAF thus giving off wrong readings. It happened to my Tacoma and it bogged real bad. I cleaned the sensor and then it ran great... Just a thought.

Yea, I have heard on here that if over oiled they can cause problems with the MAF. Thanks for the heads up.
It seemed to completely correct it after I got my tune done by UpRev though.

[Racer G]

Thanks for the info guys... I would probably have an exuast shop simply build a custom low cost cat back. But a made to order exhaust is dyno'd for the peticular car. I did talk to RED_DET and ordered my rc2 intake... nice! Has anyone ever added one of these inexpensive ebay "chips" to their g37? Does it help any power/MPG?