i am also good buddies with a few techs at nissan i can/have get them to help me on the side!

will

 

good going

 

damn.. that's sweet... i'm from atl too... hopefully i'll see u around so i can check out those headers...
we should have a meet jus so u can show them off... haha

 

lol... PM me so we can arrange a time you can check em out!!!!

will

 

P0507 - Idle Speed Control System RPM is higher than expected

1) Check for Intake Air Leak
1a) Start engine and let it idle
1b) Listen for an intake air leak after the mass air flow sensor

2) If step one is ok, replace ECM

That's all the diagnostics that the service manual gives.

I would also try to reset the ECU and relearn the Idle Air Volume.

The resetting the ECU procedure is available at:

http://maxima.theowensfamily.com/reset-ecm.jpg

To relearn the Idle Air Volume, here is the procedure:

NOTE: Make sure the car is in Park/Neutral and the Emergency Brake is on. Also, it is extremely helpful to use a stopwatch to help with the timing. Timing is 100% critical.

1) Start engine and let it warm up to normal operating temps
2) Turn off the A/C
3) Then turn off car
4) Wait at least 10 seconds
5) Turn car IGNITION on (but don't start it)
6) Wait 3 seconds
7) Do the following 5 times within 5 seconds
7a) Press the gas pedal all the way down
7b) Release the gas pedal completely
8) Wait 7 seconds
9) Press the gas pedal all the way down for at least 20 seconds until the SES/MIL light goes off
10) Release the gas pedal within 3 seconds of the SES/MIL light going off
11) Start the engine
12) Wait 20 seconds
13) Rev the engine 2 or 3 times up to 3500 RPMs or so as if you were accelerating - Once you reach 3500 RPMs, release the gas pedal and wait for it to return to idle before doing it again
14) Check the idle speed
14a) For a manual, it should be 625 RPMs +/-50 RPMs
14b) For an automatic, it should be 675 RPMs +/-50 RPMs

 

thanks man! i tried all of it.... nothing..... but then i put my old air filter back on (that small A$$ frankencar one) and reset it one more time and for some reason its running fine........ WTF!!!!! i dont understand someone please explain y the tiny frankencar intake filter is making my car run better? when i say run better the idle isnt at 900 rpms.... now its right under 700 where it should be... no more rough idle the needle stays put..... the 5k power loss problem has slightly gone away.... please help me understand!

will

 

thanks bro!

 

Wow...228hp with an intake and some exhaust work? That's amazing. Or have you not updated your sig? I figure the 6spd stock at around 207 then intake will add maybe 7 and the exhaust maybe 3 NA for a total of like 217 or so. What other mod's do you have?

 

I wouldn't pay as much attention to the peak numbers as the baseline. SCC has proven a 20hp tolerance for 4 different dynos on the same 350Z.

 

the track is the only true dyno.

 

need a new clutch and rear motor mount before i even think about hittin the 1/4mile...

will

 

Will: I'm not sure why changing the filter would cause an extra 200 RPMs, unless the "bad" filter needs to be cleaned. You could also try this... run to a local auto parts store and buy one of those Ractive 3" air filters. I know you don't want to use it indefinitely, but see if the Frankencar and the Ractive filters are ok. If so, you know that your current filter is bad. You can then return the Ractive filter back to the auto parts store.

 

for those wondering about dynos, Nissan Performance Mag just installed Hotshot headers on their 3.5 Altima: 17 WHP gains. They said it was really, really loud before putting in a resonator too. check their website

 

approx gains for headers/ecu combo 30whp peak and god knows how much throughout the powerband. Im ready to see some 3rd party dynos

 

I know where my federal tax refund is going.

 

....

 

Anyone know why Stillen didn't produce it as equal length like Cattman is for the 3.0l?

 

i was wondering the same thing........

will

 

Just out of curosity... before you put the headers on, did you have a Y pipe? I saw the picture of the stock Y pipe and assume that you didn't. I know that the sound in my setup dramatically increased when I installed my WSP Y pipe on my car. I was just curious to see if it was the headers themselves, or the combination of the headers and Y pipe that was causing the excess noise.

I do agree with you that the noise was absolutely obnoxious when I installed the Cat-Back system. The MagnaFlow muffler was removed 2 days later because the noise was so unbearable.

I'm just interested to see if it's the actual headers that make the noise, or if the Y pipe makes most of the noise.

 

its a combination of both..... the stillen headers wont go on with out the y-pipe and vice versa unless you but the cattman one that has just recently come out. i had a y pipe on my 2k1 and the sound increase was not nearly as much as the header/y-pipe combo ... so to be honest with you i couldnt really answer ur question 100%!

will

 

Very nice!

 

I noticed the same thing. Wasn't this one of the main issues peeps here complained about the WSP Y-Pipes?

 

They had time to do plenty of R&D on this thing so I guess we have to wait to see the gains on the Cattman headers to answer that question. I expect the Cattman headers to sound better than the Stealin headers regaurdless of output.

 

Wait I'm confused....do the Stillen headers come with their own Y-pipe?

 

Yes

The reason I asked was because I already have a WSP Y, WSP B, Cat, and FlowMaster 60 Series installed. The sound increase was very dramatic from the stock Y to the WSP Y. I know that my WSP Y would be removed in order to install the headers. I was just curious about whether the increase in noise was due to the headers themselves or more due to the Y pipe.

No big deal.... any idea of when you'd be getting a dyno?

 

Im curious also. The HKS might have to go if the shorty header portion of the setup increases the exhaust noise dramatically.

 

dyno should be within the next week.... i dont want to dyno wit ha broken motor mount.... car still seems to hang around 5k rpms a lil... so i dunno!

will

 

Any fart can straight through exhaust like HKS, Greddy, etc. will be loud as hell with a Y-pipe alone. Headers will add to that.

I'd drop a 50 or 60-series FM muffler to quite things down a bit.

 

Lets see some pics on the car.

 

Why would installing headers cause the car to run a little more lean?

 

Because of the increase exhaust flow allows for increased intake flow. The injectors already hit about 80% on a stock motor. There isn't much left to compensate for the increased throughput even though the ECU sees the extra air flow.

 

I thought the way headers made power was from allowing exhaust to escape with less resistance on the upstroke of the piston, reducing parasitic drag (pumping losses) on the motor. During the upswing the intake valve is closed in a typical conservative factory camshaft timing configuration. If there is too much overlap, exhuast gas can be pushed out the intake valve causing reverberation. Is this wrong?


Jesse

 

That is the main part of it, i was just trying to answer your question.

 

http://forums.maxima.org/showthread.php?t=255053