5th Gen / 5.5 Gen Header Thread

[huffdaddy2008]

i used 18 guage copper wire and just quick spliced the extension on both ends. The wiring looks kinda funny though cuz its really fat where i put heatshrink and electrical tape around the quicksplices but oh well. Im glad i didnt wait any longer though cuz the wire was almost vibrating on the header and had burn marks on it. I shouldnt have any problems w/ splicing as long as theres a good connection right?

[Ronniels]

I just received my OBX's and I am in the process of doing an engine swap.
With the one piece design of the rear header and y-pipe, anyone have a suggestion of whether it would be easier to bolt on with engine completely out, or set the engine in partially and then bolt them on?

Thanks

[upstatemax]

Originally Posted by Ronniels

I just received my OBX's and I am in the process of doing an engine swap.
With the one piece design of the rear header and y-pipe, anyone have a suggestion of whether it would be easier to bolt on with engine completely out, or set the engine in partially and then bolt them on?

Thanks

I would put on the manifolds before dropping in the engine, just don't tighten them all the way down.

[OOmaxSE]

Originally Posted by upstatemax

You can take care of your secondary o2 sensors with an o2 sim...

Pull your intake again and make sure it is installed correctly along with all Vacc lines.

I was praying that the o2 sim will take care of the secondary but it doesn't completely. If you have a faulty o2 sensor, this will trigger a P0141 code (secondary sensor heater malfunction). The o2 sim will take care of other codes relating secondaries (I believe P0138-P0140) but it doesn't tap into the heater wire, that's why the secondaries need to be plugged in still. You need to get a resistor or buy a new sensor, I'm currently in this situation... kinda steaming it out, aha.

[upstatemax]

Originally Posted by OOmaxSE

I was praying that the o2 sim will take care of the secondary but it doesn't completely. If you have a faulty o2 sensor, this will trigger a P0141 code (secondary sensor heater malfunction). The o2 sim will take care of other codes relating secondaries (I believe P0138-P0140) but it doesn't tap into the heater wire, that's why the secondaries need to be plugged in still. You need to get a resistor or buy a new sensor, I'm currently in this situation... kinda steaming it out, aha.

You can sim the heater now...

Guess you have to mount it in a safe place because it gets pretty hot... But you are supposed to be able to get rid of the sensor completly after you sim the heater.

[03MAXTNR]

I just purchased my hotshot headers for my 03 max and it never came with written instructions. Ive searched and was unable to find what i was looking for. Can someone help me with this. Also ive decided not to go with the o2 sim and opted to weld the o2 bungs but dont know exactly where to place them. does anyone have a diagram or pic as to where they weled them. I believe its on the y pipe somewheres.

[upstatemax]

Originally Posted by 03MAXTNR

I just purchased my hotshot headers for my 03 max and it never came with written instructions. Ive searched and was unable to find what i was looking for. Can someone help me with this. Also ive decided not to go with the o2 sim and opted to weld the o2 bungs but dont know exactly where to place them. does anyone have a diagram or pic as to where they weled them. I believe its on the y pipe somewheres.

Go get a service manual for the car to learn how to swap the headers or search on this site, the instructions are on here.

The secondary o2 sims that you are not going to sim have to go behind the main cat into the B-Pipe.

[03MAXTNR]

If the secondary o2 sim have to go into the b-pipe then why arent they there on the stock b-pipe. Where are they located on my stock exhaust?

[NmexMAX]

If the secondary o2 sim have to go into the b-pipe then why arent they there on the stock b-pipe. Where are they located on my stock exhaust?

Because they monitor the cats, and the stock system has cats in the header, your new headers do not.

[CrucialMaxima]

where do you get bungs when you want to just extend the wires??

[upstatemax]

Originally Posted by CrucialMaxima

where do you get bungs when you want to just extend the wires??

Why would you want to extend the wires? Do you have headers?

If you do, any exhaust shop should have them.

[slickrick]

Originally Posted by CrucialMaxima

where do you get bungs when you want to just extend the wires??

they should come with your headers...I had an exhaust shop weld 2 bungs into my cattman b-pipe for $20.

[03MAXTNR]

what type of wire do we need to extend the o2s?

[CrucialMaxima]

Originally Posted by upstatemax

Why would you want to extend the wires? Do you have headers?

If you do, any exhaust shop should have them.

I plan on getting some in the near future. No need to be a ****. I am just trying to find out some information.

[upstatemax]

Originally Posted by CrucialMaxima

I plan on getting some in the near future. No need to be a ****. I am just trying to find out some information.

And I was trying to get some info from you... So we can give you the info you need.

Sandy Vag FTL.

[NmexMAX]

Originally Posted by CrucialMaxima

I plan on getting some in the near future. No need to be a ****. I am just trying to find out some information.

If header are in your future, then there's some important things you must know, about them. It's all in this thread and obviously you haven't read through it like you should have.

Prior to getting headers, learn as much about your car as possible. 1st thing to do when considering headers is to obtain an FSM. (Factory Service Manual).

This has well laid out diagrams of both mechanical and electrical components of the entire exhaust system. Which is something very important to a proper install and final set-up.

The question you asked can easily be found on page 1 of this thread. Or, can be seen in the FSM.

I'm sure the reason upstate asked you those questions is because of the elementary nature of your post. If you are seriously considering headers, I'd suggest doing as much research as humanly possible (searching for many hours on here and ) BEFORE asking questions on here. Basically, exhaust(pun intended) all options before asking here. Because, odds are, it's been asked and answered before. You need many hours of --->

[maxspeed96CT]

Check out these numbers

Stock

VS

Intake , hotshots, test pipe , 2.5" catback, tunned safc.
(my numbers are kinda low but check out that curve!)

[NmexMAX]

Stock midpipe might help you with that dip in the early 5k's. Sift through this thread.
http://forums.maxima.org/showthread.php?t=376123

[vinny]

hey maxspeed, was that corrected or uncorected on the dyno, also what year is your maxima, and finally what was your a/f ratio throughout the poweband?

[maxspeed96CT]

Originally Posted by vinny

hey maxspeed, was that corrected or uncorected on the dyno, also what year is your maxima, and finally what was your a/f ratio throughout the poweband?

Thats sae corrected.

heres the a/f graph for you guys.

Stock
vs
headers back after tunning.

BTW I also just got a SES today, pritty sure my MAF is bad, gettin 02 sensor cells but car feels real sligish, it happend before and i just cleanbed it, now the car feels even worse..........
Might go get it retunned.

[vinny]

hey max speed i see your a/f ratio is averaging around 14.5 throuout the power band, do you have any overheating problems. they set mine to around 13.4 throughout the power band, i was wondering do you have any overheating problems with your a/f ratio being set so high and is your engine a 3.5l or 3.0 they told me it would be dangerous to set the a/f ratio any higher because it could burn up the heads finally on your dino sheet was that hp at the wheels or flywheel

[NmexMAX]

Originally Posted by vinny

hey max speed i see your a/f ratio is averaging around 14.5

Maybe you should take another look

Originally Posted by vinny

finally on your dino sheet was that hp at the wheels or flywheel

I'm sure he didn't take the time to remove his engine, and then strap it to an engine dyno. It was at the wheels.

Originally Posted by vinny

they set mine to around 13.4 throughout the power band,

Who did and with what? How did they take the readings, and from where?

[vinny]

Originally Posted by NmexMAX

Maybe you should take another look


I'm sure he didn't take the time to remove his engine, and then strap it to an engine dyno. It was at the wheels.

Who did and with what? How did they take the readings, and from where?

nmexmax around 14, also if i am not mistaken on page three or four of this thread their are dyno posted with results at the flywheel and i dont recall that person removing their engine and strapping it to the dyno, thirdly i have the exact same set up with safc 11 mine was dynoed at carboy i have new catman headers my afc was set to 13.4

[NmexMAX]

There is no way to dyno the engine itself (true chp) with out removing the engine.

I too have the same set-up and my AFR was set to 13.8 using the SAFCII Many factors come into play when tuning, especially that high. Grade of fuel, timing, IAT's, & heat range of spark plugs.

DJ248's measure power at the wheels, that's what maxspeed used to dyno.

[Puppetmaster]

Originally Posted by NmexMAX

There is no way to dyno the engine itself (true chp) with out removing the engine.

I too have the same set-up and my AFR was set to 13.8 using the SAFCII Many factors come into play when tuning, especially that high. Grade of fuel, timing, IAT's, & heat range of spark plugs.

DJ248's measure power at the wheels, that's what maxspeed used to dyno.

I think there are Dynapack dynos posted somewhere in this thread actually...

Also, speaking of AF tuning, theoretically, it would seem better to tune with a wideband on the dyno instead of a sniffer. This is probably more applicable to the people with a working main cat because the sniffer will pick up leaner mixtures than the wideband (assuming the wideband is bunged before the main cat, if there is one). I know a main cat affects the sniffer readings, but I'm not sure how much the difference is in terms of AFR, so maybe someone else can chime in on this.

Is the difference even significant? I would have to assume that it is.

Found some info, but not enough to satisfy:

http://forums.maxima.org/showthread....iffer+wideband

http://forums.maxima.org/showpost.ph...1&postcount=16

[NmexMAX]

Yes theres is, UtsuUtsu's (?) But IMO, that's not an engine dyno. The title on the dyno sheet is deceptive (Flywheel horsepower) http://home.earthlink.net/~spchurch/...ting/id12.html

My cat isn't working, well, even it it was, my bung is upstream. In a members thread entitled tuning for newbies,(--> Credit, Kevlo911 http://forums.maxima.org/showthread.php?t=481540 ) there is enough info there to have fun with for a while.


Also I cannot remember where I read it, but there as an AFR log on a dyno with respect to both a wb and a tailsniffer and the only difference was a little lean down low (RPM). Makes sense since the exhaust velocity isn't that great, and therefore may give a lean reading.