OK. First modification to my maxima. I'm not so sure I'm proud yet, but it has helped quite a bit.

I told myself, "Why spend money on something that nature wants in the first place..." Exhaust relief vs nature-safe restrictions.

I made some holes in the exhaust (1/4"). The exact location is from the exhaust manifold...down the piping to where it makes a good 60-70 degree bend to the rear of the car...i punched there with a metal drill bit (at the angle). I was planning bigger holes, but I wanted to progressively test. Luckily I stopped at my first hole size. I've ran my g/f's eclipse w/o exhaust when I changed out the head gasket, and...well you get the idea.

I figured at that location, the amount of exhaust pressure will want to release better than lets say, down the piping towards the main cat or what not (and also allow me an easy repair. Yet, I did it after the two o2 sensors on the oe ypipe.

Next week, I will be welding on some unscrewable valves ($4 at loweS) to the holes I made...have emissions in a few months. My precise holes will allow this. I just have to pull out the ol arc welder. Any suggestions? Or should I pull out my oxygen/acetylene torch? I have a top-notch welder at disposal, but hmmm.

I now know what "bees in the can" means.

LOL, any comments on this? Lets just say I was a bit bored on a saturday afternoon.

 

That is taking away power, if anything.

All you are doing is making noise and pollution. You are creating huge anmounts of turbulence in the exhaust, whichs hampers flow and hurts power.

Weld up the holes and get a Y-pipe.

 

Well all I can say is that it now responds/feels more like my quick revving 4 cylinder stanza. It's fun at the low end(stanza), revving her to 5.5K, but on the high end she sucked. She takes a day and a half to get to high speeds.

So now I got the benefits of both worlds, low end play as well as the maximas high end speed. The stanza would die off at 120-130 (5.5K-6K in 4th). She has (stanza) unintentional exhaust leaks (leaking crush seals).

I can agree that I'm making more pollution, but I live near Mexico. They got 2 million peeps over there making severely unrestricted pollutions (compared to 700K over here), so I figure, whats the diff? Not to mention all the factories.

What turbulences do you see with an exhaust like this? I just figured I was making a "blow off" valve only when the exhaust had too much pressure. Consider the basic ideas of a vacuum.

Thanks.

 

I just hope that someone either vandalizes your car or the law takes it away. If you only made the holes after the main cat it would be fine but making them starting at the manifold is just some brain dead **** only a half wit with a hole in his head would do...

 

not starting at the manifold...at the bend of the oe ypipe. After the cat would do absolutely nothing. You need the o2 sensors granted, but I placed them 6 inches after 2 of the o2 sensors.

I've yet to hear an intelligent answers to the post except for mzmtg. Post something scientific...or atleast from experience. That's the dumbest post i've heard in my life ivelweyz.

 

How is that? I said everything that mzmtg said except in a less civilized fashion. After the cat would probably do nothing just like it did now...

 

OK granted confusion may exist since it's not exactly easy to explain without a full length video...

There are 3 Cats right? 2 pre-cats, and 1 main cat converter. I drilled after the 2 precats and 2 O2 sensors, and into the main bend of the OEM ypipe (1 inch before of the bend). This would mean I drilled before the main cat and mid pipe. It would also mean I drilled before the 60-70 degree bend in the ypipe/exhaust system.

Any of you tried it?

 

why not install a remote cutout at the y/cat connection. then when you want to exhaust hit the button, then back to normal again they are like 40 bucks and you can install it yourself...i hear cars like yours sound ****ty and they exhaust sound is very unrefined and bangy....how does it sound? anything other then a butt dyno?

 

I know where you drilled. You might as well had just removed the o2 sensors from the holes and be done with it. Tie them somewhere and you're set. I know I drove with one of them out and the car was loud as hell and slower than crap...

 

Ivelwyz...first off...you've been drinking...or...hmmm...yeah...remove my 02 sensors...sounds like gold.

Torgus...you're a friggin genius. Damn...I thought they were like $200 bucks. I should stop listening to my friends and just listen to maxima.org people like you. I thought those free-flow exhaust remote thingies were alot...I guess I should re-research. Tho, just to clarify....opening exhaust before 02 sensors would not be good (open on exhaust manifold or right after).....our cars need to adjust to fuel/oxygen levels. I opened mine after 2 02 sensors. And you're right torgus...I'm glad I didn't open my exhaust past 1/4"...or I'd have some loud stuff going on (but bees in the can).

No nothing yet but a butt dyno torgus...yet I have my 4 cyl 2.4L nissan comparison at hand. That's all. Finally a dyno in my area has opened...yay.

 

I feel like smacking the **** out of your mouth. By driling the holes you did pretty much the same exact thing as taking out the o2 sensor. What's the difference cause I don't see it. The o2 sensors still work and you still have holes. Either way you're polluting like crazy...

 

Search for "exhaust leak"

You will see that many members have spent a lot of time trying to figure out why their cars were way down on power. Many of them had an exhaust leak because of a poorly sealed gasket somewhere in the system.

I promise all you get from making holes is noise, NO POWER!

 

Got the ole psychological syndrome called MNMP=More noise More Power

What a waste of dulling a drill bit, does your stanza also have a 3 foot wing, and spinner hubcaps? If you drilled 1/4" holes...........u got nothing my friend.....1/4" is about the diameter of a pencil eraser..if you think enough air is coming out of that small hole to give you more power................then you might wanna also add an electrical supercharger, and the ebay maf mod..........you'll be back to 190hp in no time.

 

I do not see how turning your exhaust into a spaghetti strainr will yield any real results.

You can buy a valve which can be installed into your exhaust to switch from dumping exhaust right after the cat to just going with a regular exhaust.

Drilling holes seems kind of ghettofied.

Big Cracker

 

My 95 maxima is bare, don't even sport hub cabs. I use vinyl shine stuff to make the black steelies, well shine.

Mzmtg, guess I'll have to get the arc welder out and do some spot welds.

Hehe infinitiblast..Drilling holes takes 2 minutes, and a spot weld another 2 mins. Cost is free to experiment with. Not to mention, if I screwed up somehow, I would "have" to buy a ypipe.

Btw, I was friggin royally toasted last night...FYI

 

all you are doing is letting out more exhaust gas that hasn't been filtered or muffled. sounds crappy, and doesnt give u any power... why do you think taking out the cat and changing everything cat back only gives you like 5-8 hp. you didnt gain crap by making more holes

 

did i just really read this?
I am at a loss for words, besides ivelweyz put it beautifully. To be blunt, put the drill down Bob Vila, it's not "This old car".

 

I don't see how this could improve performance. Opening up the exhaust stream before the O2 sensors is definetly going to mess up the readings the ECU uses to determine air/fuel mixture. The problem is, exhaust gas will leak from the pipe under certain conditions. This is not that big of a deal. However, if you study fluid dynamics (remember gasses behave like fluids), quite a lot of ambient air will be ingested as well. How you say with pressure in the system? Well, as the exhaust gas flows over the opening, the significantly faster moving gas will draw in ambient air through the opening. Don't believe me? Take a straw and put it into a cup with water in it. Now blow across the top of the straw, you'll actually draw water upwards.

When the ambient air is drawn into the exhaust pipe, it now raises the O2 content of the exhaust stream that the O2 sensor will measure. The O2 sensor will then detect this as running lean, and will try to richen the mixture. As the mixture is richened unnecessarily, it will cause a loss in output.

 

more proof...you messed up your power because you were bored. make an exhaust system instead of drilling holes in this one. since you say you can weld....make a cat back.

 

werd the fock werd. Are you serious? Just spend the 200 for an OBX or somethin. If you keep it like that, we're gonna get another thread from you saying "Help. Noob Max stuck on side of road."

 

BUAHAHAHA!

 

Sweet! The exhaust hole mod! 13's here I come.

 

wow. you guys sure hate alot. hey man check out a summit racing magazine they sell remote cutoffs...there are 2 types eletrical and manual...the eletrical ones costs more but is only a button...the manual ones have a cord you have to run into your engine compartment to pull on to open the cutout...and there are racing cutouts and you have to get under your car to remove the nuts and move it yourself. do a google search.....i hope you install a remote cutout...i would install it at the y/cat intersection, or 2 cutouts right after each 02 sensor. it will be hella loud...i was thinking of doing it but i never had...let me know how it turns out if you do. also don't be angered by everybody flaming you. thats all people do on this board it seems. flame and *****. oh and call people n00bs. pm me if you have questions or people will just keep flamming you here.

 

i recommend going for a y-pipe. the removal of the precats alone will offer you noticible gains. the ones from budget are fairly affordable these days.

 

I can't believe I just spent 10 minutes reading this.

 

and i cant believe he spent time wirting this response. Yea, remote cutouts do something a lot different than drilling holes in your exhaust pipes

 

My favorite part of this is that dude thinks he's discovered something. As if for the last 50 years of modding cars no one ever figured out to just drill holes in the exhaust. All those aftermarket exhausts are useless...just drill holes! No benefit to removing the precats, just bust a couple holes in the pipe. Maybe we should all just remove our exhaust manifolds and just dump all the exhaust straight out...yea +50HP!!!

Car: BWWWWAAAAAAAAAAAAAAAAAAAAAAAAAAAAPmmmBWWWWAAAAAAPP P!!!
izzydig: HEY MAN THE CAR'S PRETTY QUICK NOW RIGHT!!!!!??
Friend: WHAT!!!!!!!!!!??
izzydig: I SAID, THE...CAR...IS...PRETTY...QUICK...NOW...RIGHT!!!!! !????
Friend: OHHH YEA MAN, IT FEELS KINDA SLOW ACTUALLY BUT ITS HELLA LOUD SO IT *MUST* BE MOVING FAST!!!!!
Car: BWAAAAAMMMMMMMUUUUUMMMMMBWAAAAAAAAAAAAAAAAAAAAP!!! !
izzydig: WHAT!!!???
Friend: NEVER MIND!! DUDE COULD YOU TURN UP THE RADIO I CAN'T HEAR THE MUSIC OVER YOUR NEW EXHAUST!!!!!!!!!!!
izzydig: SORRY MAN BUT IT'S ALL THE WAY UP ALREADY!!!!!!!!!
Friend: OHH THAT SUCKS! THAT'S THE PRICE OF PERFORMANCE THOUGH I GUESS!!!!
izzydig: WHAT??!?!?!
Bone Stock Civic in the passing lane...20mph faster: mmmmmmmmhhhhmmmmmmmm

 

If you REALLY want to relieve some pressure, drill holes in the block.

 

...or maybe in the side of his head!

 

o.k., then what are you doing now and why are you a member
we are just being honest. We COULD just lie to him

 

or you could take out the oil drain plug, i hear there's a lot of pressure on that. Take it out, and then drive your car to the track, run it hard for a couple of hours, then drive home, but be careful, after working so hard your engine might "cramp" up, so be sure to massage your engine afterwards.....with your bare hands.

 

we COULD lie...hmmm.

Drilling those holes was an awesome idea, why didn't we all think of that yet? i'm going to go do that right now, where did you strategically place those power holes? lets do the intake next!

 

Homer Simpson: and what are these holes in the hood?
Used car salesman: Those? ummm, those are...speed holes. Yep, that's right, speed holes. They make your car faster.
Homer: Speed holes, eh?

later
Ned Flanders: Hey homer, what are you doing to your hood with that pick axe?
homer: Putting speed holes in the car. They make it faster, duhhhh.....

 

We could sell this on Ebay and make Millions!!!!!!

Order Power holes now, and get speed holes for Freeeeeee!
3 easy payments of $29.99

 

homer used a pick axe and this guy used a drill...homer wins

 

well congrats to you guys who like to b itch about things, but don't have any ***** to try something different. God forbid someone tries something different around here. I'm just looking for some technical responses.

No, I wasn't the first to think of this. Are you 12? Though I must say...I guess I am one of the first to try it on a 95-99 maxima, considering all the flame-w ****'s responses. I chose these "strategic locations" because it allows an easy repair.

No it's not loud, just raspy under 5.5K to idle. It's loud and raspy under WOT or over 5.5K RPM's. I'm sure a cop would have told me if it were really loud by now....it's unlike running straight pipes for instance.

No the car won't fall apart or be on the side of the road due to some holes in the exhaust. At best, a CEL light would come on twice in the past 3 weeks (downstream 02 sensor) as it did, and explains the following:

Since Sin has posted an informative response, he gets a direct answer:
You're absolutely correct about fluid dynamics in relation to air/fuel mixtures. Basically the exhaust flow will cause a vaccuum sucking in outside air and accelerate oxygen flow across the 02 sensors...yet I did make the two holes after the o2 sensors on the precats but...what I DIDN'T realize until now (after looking over the haynes manual), is that there is a 3rd downstream o2 sensor. Bah.

Torgus: Hey man, no anger hear. It's kinda funny seeing people run their mouths. Secondly, I don't think I'll try the remote cutouts, because of the 3rd 02 sensor. I dunno maybe I will when I get bored again. My 92 stanza, well I could try it there, because there is only one 02 sensor directly on the exhaust manifold. I assume these cutouts relieve all pressure on the pipe.

Now people, quit wasting my breath...unless you have something informative and knowledgable to say. This board is an absolutely tremendous and great resource for maxima owners, yet it's a bit sad when people pollute it with garbage.

 

uhhh.... exactly

 

Ummm gee, like I didn't predict exactly such a response on that sentence. Proof of another feeble mind. I was hoping someone would prove me wrong...but...

 

Spend 180$ and get a proven 10 or so hp at the wheels mang....Turbulence is all you are gonna get, which is what creates the sound. The exhaust flow tries to flow through the exhaust, but some gets sucked out your 1/4'' holes, while some continues, creating noise, and disrupts the smooth flow of your exhaust. What kills our performance is the huge Pre cats in our y pipes, and the huge Bulges on the inside of the piping of the Y pipe That Houses the O2 sensor tip... These holes doesnt stop the turbulence that these o2 ridges creates, but merely creates more.

 

once again...you are the wrong one you said it was sad when people pollute it with garbage...wonder whos doing that you have missed the point of everything in this thread man