knight_yyz

iTrader: (40)

huh? i thought the secondaries have nothing to do with fuel trim. They are just there to verify the precats are working.

eyecon7

iTrader: (4)

is there a thread that shows how to do this

NmexMAX

iTrader: (22)

I've had my secondaries plugged into the header bung (secondary sensor, plugged into primary port) for 26.5 months now.

Whereas my primaries are sitting in a box somewhere along with my engine cover.

I still manage to get 26MPG on the highway and 23-24 elsewhere.

The secondaries are there not only to monitor the condition of all the pre cats, but also in case the primaries are not found &/or are sending a faulty signal(i.e dead). In whihc case tehy 'take over' But they oscillate at a slower rate, which may ultimately affect MPG.

I do not have before and after MPG accounts to back this up, but I'm happy to get 26+ MPG highway.

fishpony

iTrader: (2)

Finally got the headers installed!!! 5pm- 1AM with about 45 minutes of breaks. i know if i did it again i could cut off atleast 2 hours. especially if i wouldnt have broke the stud on the cat and also i think i could have done it without taking the IM off because i tightened up the rear header from underneath. just waiting for the soapy water to dry so i can start it up and see if i have any leaks or rattles. hopefully i dont. im going to simulate them for now and see if it affects my mpg. i usually get 19.5 so as long as it doesnt get worse ill be fine. i did manage to get 24 up to KSU saturday averaging 75-80. well gonna go start it up and put my hood back on.

E55AMG2

iTrader: (4)

Secondary Oxygen sensors monitor the fuel trim in closed loop, hence why they call it closed loop. It goes thru all of the sensors then back to the ECU. The secondaries are ignored during heavy acceleration (WOT, or close to it). Your in town fuel mileage will go to **** w/o them installed, unless you use sims and tune the car using a piggyback. However, doing that does limit your operating range.

I call BS on 23-24 mpg city.

E55AMG2

iTrader: (4)

The instructions come with the headers. At least, they did with mine 3 years ago.

NmexMAX

iTrader: (22)

Used to be 21-22 60Hi/40Ci.

When I switched to my 14.3lb 17's, it went up to 23-24. Again, it's not all city. 26.3-.6 All highway (630 mi trip)

I drive to work ~50 miles/day, but keep in mind, on my way to work there is a 1900' altitude climb in the morning & obviously drop on my way home.

knight_yyz

iTrader: (40)

i've noticed a drop in mileage since the headers but I have a lead foot. My computer used to say I used 8.9L/100km. The day after the install it jumped to about 12.1L/100 i think it was. It's been a few weeks now and has dropped to 9.1L/100 so it hasn't really gotten that much worse. (ecu relearning?) Most of my driving is highway. I'm averaging about 400 miles per tank or 650 km per tank

Geeze, after reading a billion threads in here I thought the sim was the way to go. Although I did think about bunging the secondaries behind the cat in the b-pipe. After I piggyback I'll see how my mileage is.

maxspeed96CT

iTrader: (9)

my tracking number now works, cant wait!

E55AMG2

iTrader: (4)

Try getting that anywhere in FL thats urbanized. The best you can do is 17mpg mixed and 21 highway. I hope you're not using the on board computer....it only samples every 30 seconds and is about as accurate as using a sun-dial at night.

LA02MAX

iTrader: (3)

why, pray tell? I live in baton rouge and my driving time literally consists of 95% traffic with 2 or 3 WOT runs each 15 minute drive to and from school (4 miles each way) and I usually get about 21 mpg (calculated by hand not by the computer) and on trips I get well over 30 (I've gone over the 600 mi. mark before on a trip on a single tank of gas). Just because your maxima doesn't get good mileage doesn't mean there aren't any out there that do...

Good job on the header install fishpony. I know when I install mine I'm going to run into at least one problem, but that's modding for ya!

slickrick

iTrader: (12)

I will have to agree with Mike, but he had an auto and so do I. I would never fathom 600 miles in my car, even if I was going 50 mph constantly downhill in neutral. going 600 miles with a full tank is about 32mpg which seems borderline impossible in a maxima.

LA02MAX

iTrader: (3)

exactly my point. Just because YOUR maxima doesn't do it, it doesn't mean other's cant...although Nmexmax's is an auto, 24 mpg is not farfetched IMO...

EDIT: and yes it's very easy to see 32 mpg in my car. I do it all the time (I travel a lot)

NmexMAX

iTrader: (22)

Good cripes man, I thought you had more respect for me than that.

I also have Z33 injectors, so my readout is worse than it already was(in the 29+ range).


315 one way, so 630 round trip, and of coruse a fill-up in between.

Yesterday I had 334mi on my tank, and tossed in 14.020g. = 23.82MPG.


6MT FTW.

E55AMG2

iTrader: (4)

I've been to baton rouge, the traffic is totally different. Come to miami and see how normal traffic goes and see if you get the same 21mpg.

Either way, we are getting off topic. I was just saying that with wire extenders, your ecu can more effectively manage your long term and short term fuel trim.

LA02MAX

iTrader: (3)

But I'm going with cattman headers so I won't have that problem

E55AMG2

iTrader: (4)

For the record, if you do drive at or around the speed limits most of the time, and never crack 80 when you do go above its entirely possible to get 590+ miles out of a tank of gas. I drove from miami to jacksonville (via orlando) and back the same way, and did not fill up until the port st lucie rest area. The only issue is that you really do get nowhere fast.

E55AMG2

iTrader: (4)

eh? .

LA02MAX

iTrader: (3)

Yeah I usually set my cruise to 78, but on that 600 mile tank I actually drove 84 or so on the interstate through AZ, NM, and part of TX since the speed limit is 80...my MPG is the best when I have the sunroof open and the A/C off with it on vent. With A/C i typically see a 1-2 mpg drop.

LA02MAX

iTrader: (3)

no extension needed...

NmexMAX

iTrader: (22)

You didn't even say hello.

You'll need to extend them, or sim them. Those primaries have seen stunted growth syndrome .(i.e really short)

LA02MAX

iTrader: (3)

Uprev cipher this summer?

orly? I thought that there was no need with the new cattman's...I guess I was wrong then. I retract my statement

E55AMG2

iTrader: (4)

To reach behind the main cat, they will.

machinehead131

iTrader: (1)

Wow where is my tracking

sweetjackal82

I FINALLY got a reply last night....

On the 8th my check cleared my account, and then later that day he emailed me and told me he would get me a trk # later that day... 5 days later no Trk #... WTF??

So now he emails me and says it takes 5 biz days for a check to clear and he deposited mine last week so it will clear this week (B.S. it already came out of my account... whatever) and he will ship the headers on Thurs/Friday... 5 days to FL from CA... so i should have them by the 23rd

coinage

iTrader: (10)

Maybe it is my check he is waiting to clear?

machinehead131

iTrader: (1)

My check cleared a while ago...so i don't know what hes doing a couple people have em so who knows.

machinehead131

iTrader: (1)

How many times did you email him?

whazzzzuup

iTrader: (22)

If people have received them, I don't think any of you guys should worry about anything. Sometimes, processing and shipping just takes longer than expected.

MAXIMUS86

iTrader: (10)

i contact him 5 times before he email me on fri saying he will tell me if i got a set or not by tue the latest and its wed and i still haven't got a email.

fishpony

iTrader: (2)

i think hes probably getting swamped with emails. i had my doubts because i only received one email from him. now mine are installed... anyways my ses light finally came on today. said bank 1 running lean. is that because of the downstream 02 sensors i dont have installed or because of something else? i also thought about buying a race pipe to bung the 02 sensors in there. would that fix my problem and fix my gas mileage issue like previously mentioned or do i need to install them after a catalytic converter?

NmexMAX

iTrader: (22)

The HS bungs are not in the collector, they're in a single port. So, it may not be seeing the correct voltage.

fishpony

iTrader: (2)

hmm... crap. so the only way id be able to fix that is to weld an extra bung on the collector. and the only way to fix my air fuel mixture is to either get it dynod or get a wideband O2 correct? guess ill buy a safc2 and look for a dyno in wichita. thanks

machinehead131

iTrader: (1)

I am ordering the VAFC-II and getting tuned within a week of my header install, i am going to run o2 sims but i may just have the guy weld on bungs and such so i can extend them - just ordered my test pipe.

fishpony

iTrader: (2)

are you going to extend the 02 sensors into the test pipe then and not have a converter at all? i thought about doing this but wasnt sure if it would trip the light since there was still no converter. i might order a test pipe on ebay right now and try the same thing. where u getting the vafc-II from?

E55AMG2

iTrader: (4)

No main cat = SES light w/o sims

If you get a metal substrate race cat, you might see 1hp difference between that and a test pipe.

fishpony

iTrader: (2)

the only reason i was going to get a race cat was to bung in the extra 2 oxygen sensors. i dont think im getting a code for them not being installed right now but previously in this thread someone said that having them not installed hurt gas milage. thats why i was going to get a race car for them. easy to bung in, only like 25 bucks, and i can always put the stock cat back on later.

machinehead131

iTrader: (1)

Isn't the secondaries on the y pipe stock.....if so it wouldn't matter if it were on the test pipe - which is where i am going to try and put em.


I'll have a piggback anyway so i don't think it will matter.....i am getting the VAFC-II from ebay.

fishpony

iTrader: (2)

yeah they are on the y pipe but when u take off the stock manifolds you take off the stock pre-cats. i think i might try that too i just dont want that to screw up my AFR anymore than it probably is already.

sweetjackal82

It took 5 emails for him to finally answer... he must be really busy