whos gunna be the first to gut outtheir stock headers with this ypipe??

 

That's crazy. My driving habits are similar; I drive about 80 miles round trip. Much is highway on the Long Island Expressway car pool lane, but also local roads. Initially I was getting about 24.5 MPG, but it's settled down to 24. I also use 93 gas, usually Hess.

 

Ya, that is crazy... I average high 22's to low 23's (ish) and my commute is 30 miles round trip, 1/3 backroads with lights, 1/3 major highway, 1/3 minor highway... The rest of my milage daily is major sideroads with lights and stops and lots of hills.

 

Installed mine today. Have to say I was hoping for a little more sound but oh well. Maybe because I used to own a cobra and am used to the throatier sound.

Performance wise, I think its going to be hard to notice 15hp. I think it might be better but that might just be in my head.

Overall I wish it was a little cheaper for the results but its okay. I have to say though it was very well built and I nice product.

 

u guys culda gutted that cat in ur stock ypipe and have the same performance rele

 

Actually we've experimented lots with these pipes and have found that on all the 04+ Maximas that the cat in the Ypipe itself only attributed to 3-5 hp. The remaining 8-10 HP comes from removing the restrictive crimp and careful pipe sizing on the primaries and collector.

The 04+ and 09+ Ypipes are nothing like the one found in your 02

 

I thought the same at first too, but the more I drove it the more I noticed the added power. Getting up to speed on an onramp, after being stuck behind a slow-poke is practically instant.

As for the sound, I think it got a bit throaty, but could use a straight B-pipe or hell, a GOOD CATBACK if one existed (that'll be the day)

Drive it some more and let us know what you think.

 

it deff did, at idle when the cars at 1100-1500 rpm you hear a slight rumble now, and around the 2k rpms when your driving but thats about it

 

SO... is it worth it!?! Has anyone else who has installed this y-pipe seen a drop in the low end? That kind of concerns me. I'm expecting mine next week and am wondering if I should install it or just keep the OEM part. I am glad to hear that racingline's pipe is solidly built though.

 

Yes

 

Maybe everybody who now has one installed could give a simple "yes" or "no" to what they think of the product being worth the price as of right now.

 

Thats pretty much exactly what happened. I think its sounding alot better and the power is feeling better than stock. Now i just need to get an intake to really get this thing going!!

 

 

Man I hate such ignorant posts...

 

Yep, I also like how classy his response to Racingline's explaination is. What a meatball.

 

jus tryin to give you guys ideas on a free mod that you guys are spending 200 on

 

That's cool, but I have to agree with Racingline... If you compare the flow paths on the OEM and RLine pipes, you will see that the OEM one is terrible. Very restrictive and crimped, and just ugly looking. The RLine has nice open tubes with clean bends - even if I wasn't an engineer I would be able to see that it is a superior flow path.

 

Yea. Believe some info probably put out by the people who make exhuast systems and y pipes lol.

I'm sure the master tech at my shop doesnt know what hes talking about either.

 

huh?

 

What? It's not info put out by people selling exhaust systems. It's called fluid dynamics. It's a science. It's how people design intakes, turbochargers, exhaust systems, and aerodynamics. I'd agree with you that the master tech at your shop doesn't know what he's talking about either. His job and his expertise are in fixing and maintaining cars, not in the science behind designing intake and exhaust systems. The two fields are very different. Someone who understands aerodynamics and gas flow and the science behind it probably doesn't often get their hands dirty actually fabricating the equipment, they just hand it off to someone who can weld the pipes exactly to spec. There's no reason to believe that just because someone works at a repair shops, they know everything about car design.

 

honestly i would say no, but if you dont mind losing low end than yes, because it does make up for it at higher rpms, i hate the feeling that i lost low end torque, it disappoints me, hopefully the r2c intake will give me back some of that power (if they ever come out with it)

 

true, if you really really wanted to save the 250+ dollars , you coulda just gutted the stock ypipe, you probably wont get as much hp as racinglines claimed 13/14hp tho, but maybe an extra pony or two

 

My Y-Pipe came today despite the lack luster impressions posted so far I am excited to get it installed and here the difference.

 

I"m looking forward to MaxLover's dyno runs... That will give some concrete numbers hopefully. I swear that I haven't lost any low end. I hit the accelerator and the car takes off with noticeably more push-back-into-the-seat action. Is no one else getting this?

 

Thats about the only part i'll agree with you on.

I didnt go by my master techs words strictly...I went by the actual facts of WHAT HAPPENED TO MY CAR, then speaking to him after it happened. So since you are such an expert in fluid dynamics, please explain to me the loss of low end torque by adding thicker piping to these (and most) cars.

 

I agree. Although, I did notice an initial low end loss until I reset the ECU. Then the low end power was noticeable.

The pipe definitely makes power. My car is now consistently running 13.9s and trapping @ 100mph in the 1/4mi; best ET being 13.937 and best trap @ 100.71mph. My best time before adding the pipe was 14.145 @ 99.18 under nearly identical weather conditions. So I picked up a solid 2 tenths and 1.5mph in trap speed. I'm thinking I'll see a slightly higher trap speed once the engine gets more miles on it.

I did a couple of runs in sport mode just to see how much slower it is. The best I could manage was a 14.2 @ 97mph. Definitely not the mode to use for drag racing.

 

Well sounds like to me your MM doesn't understand exhaust systems and you obviously don't.

If you really want to learn more about the subject read this: http://www.filedropper.com/understandingexhaust

 

Did you reset your ECU? If you didn't you need to...

 

I did explain the loss of torque. It's in the link I posted.

Wider pipes, if the exhaust gas volume is insufficient (which it is, at low RPMs), allow the exhaust to cool, expand, and stagnate, reducing exhaust gas velocity. The lower exhaust gas velocity, the less scavenging effect there is on the combustion chamber, which reduces power.

An wider exhaust that has low backpressure and high exhaust gas velocity at high RPMs will have low backpressure and slow exhaust gas velocity at low RPMs, and sacrifice low-end power for high-end power.
An narrower exhaust that has low backpressure and high exhaust gas velocity at low RPMs will have high exhaust gas velocity but lots of backpressure at high RPMs, sacrificing high-end power for low-end power.

It's not that complicated. If you read some of the links, or did a cursory google search of "backpressure", you'd find it.
Exhaust gas velocity is not some bull**** myth circulated by Racingline to sell a Y-pipe to maxima owners.
Backpressure, however, is a bull**** myth created by ricers who don't know what "scavenging" means and were trying to figure out why their 4" fartcan exhausts were losing low-RPM power. You don't need backpressure at all. You don't need a "source of backpressure" in your exhaust system.

 

After having it on for a week I would say it is worth it. I didn't seem to gain or lose on the low end, but the car is an absolute rocket on the high end. I absolutley love merging onto highways and passing people now.

 

I hadn't done that yet either... I just went out to do it. How do you know if it was done right? I think I did it, when I turned the ignition to off at the end the light was still blinking. It blinked every time it was supposed to too.

So assuming it did work, I'm gonna go out later and drive around and see if it feels different. I also unloaded the BullyDog since I'm going in for the driver's seat fix / 24k service, so I can try to gauge the difference without the BD and with it when I load it back up later in the week.

 

no havent reset the ecu yet, How do i do this?

 

http://forums.maxima.org/showthread....77#post7379377

 

I really don't know so can someone explain the difference in D and Ds and why yet it feels pepier or faster and responsive, people say it is actually slower.

 

thanks for the link!....I gotta try that out now...Did you reset yours?

 

Yep, I reset it ( I think it worked ), about to take a drive in a couple min. I'll holla when I'm back.

 

Had a difficult time removing my stock exhaust during the install last night. Was able to muscle off 5 of the 6 bolts. But the last bolt connected to the rear section was too difficult to get off, must have been too rusted even though I bought my car in January. Even with WD-40 it proved to tough to get off the angle was a little weird too having just one side of the car jacked up. Scheduled to have it installed at Midas for $80, hopefully they will have better luck getting it off.

 

Any updates on MPG gains or decrease?

 

Got about half a tank left, I'll let you know next time I fill up.... MPG takes time bro. This round may be a little bias towards the bad end anyway... I just got a new y-pipe, gas milage has been the last thing on my mind!

 

I'm sure it might take a fill up or two before you can get a good idea or MPG change due to you are probably pushing the car a little harder to see difference of power before and after. Once you do get a good idea after your trial period is over please do let us know.

If you had to guess would you say it would go down due to increased HP or go up to do easier exhaling?