Has anyone done this to the lower manifold?

 

Why? I am about to in a month or 2 but not so much for performance as just to get it back in shape after 17 years

 

Jus cause I have the top kinetix and I ordered nwp spacers, rear 04 maxima valve cover to fix the 5.5 faulty one, spark plugs and 350z injectors with fuel rails. So since I'm there I kinda wanna do the lower manifold but jus curious if there's gains or if it's worth it haha

 

INB4kinetikshate

 

I don't get it,

 

Kinetix manifold is pretty well known to be a waste of money.

Truth is the stock IM on this car is fairly well done. I'm sure a nice port/polish will help though, as long as it's done well it shouldn't hurt, just stay away from the injection area, you can screw up fuelling if you smooth it out too much, or rather, rough it up too much.

Are you thinking of just die-grinding the rough edges and using an emery wheel to smooth things out? I think it's a decent enough idea, post pics/walkthrough if you go ahead with it!!

 

Sounds good I'm jus thinking about smoothing everything on it and about the kinetix I'm not sure if its jus me or idk but I really did notice a diffrence. It's lighter the car respondes a lot better and know that I have my Megan exhaust, STILLEN pulley, big MAF, with STILLEN intake, and Cattman headers I think it really helps.

 

I dunno, dyno's don't lie, but then again I haven't had first hand experience, and I don't even remember where to find the threads that went over it all on the Maxima's.
I know the ones for the G35/350Z were a great big flop

 

What MAF do you have on there.....

 

All this name dropping reminds me of clashez....

 

We have another Kinetix victim...

 

yup....

 

 

and what did you use to TUNE?

 

Unfortunately not tuned I have my vafc and aem wideband jus saving up to take it to the shop.

Do nwp spacers show gains?

My car smells a lot like gas all the time when I turn it on, will it affect it in any way if I don't tune ASAP?

 

Well considering these cars burn oil as it is, I'd get it tuned ASAP.

Running it like that will equal a surplus of fuel most likely, which can wash the cylinder walls and accelerate piston ring wear.
Mainly this happens at idle/low speeds, so try not to idle it much, warm the car up by driving it under 2000 RPM, NOT by letting it idle.

 

What Mods do you have again.

 

Cattman headers, 2.5 exhaust, kinetix manifold, 3 Inch MAF, STILLEN pulley, STILLEN intake, and that's it. Mods that are going in next week are nwp spacers, 350z injectors with aftermarket fuel rails

 

Pictures doesn't look like headers are on at that point, not a current picture?

 

 

I'm actually Polishing my 3 piece IM right now Just with an emery wheel, taking casting marks out mainly

 

So if I polish the lower one will I see any gains??

 

Crazy when I put my 3'' LRMAF, with 3'' Midpie with JW Pop, my **** was hella Lean, went back to stock and Helmoltz, but should be Tuning very soon finally.....

 

Bigger maf housing will read less air than what is actually there, causing a lean condition. Tune to add fuel.
"Scaling" the maf, I think its called.

And dude no one can tell you if it will make more power. I did mine because it was off anyways for other work. Id like to think it will, but its tough to say.

Above post is because I missed the 3"maf when you said your mods.
You will not be running rich, you will be lean. You need to address that now you can hurt the engine.

Id like to see your fuel trims lmfao.

 

Try adding 440cc injectors to the mix.

 

I'm actually adding the 350z injectors with 350z obx fuel rails

 

I hope you're planning on a tune right after this, you're really pushing things without a tune this is all pointless and only going to hurt things. Sounds like a tune is on your 'hit list', you just might want to move it up the list a bit more



Anyways, here's mines that I did last night (RWD VQ35)


Before Polish/buffing, note how nasty and rough the casting left some of the surfaces






And after:

 

That's awsome work bro, and yea im planing on tunning ASAP but the shop is 2:30 hours away so u think the drive will affect me in anyway?

 

I wouldn't drive it without a wideband to know what is going on, personally

 

+1

I would drive on your old MAF/intake and install the new one on-site (on the dyno, in the parking lot...)

 

That's a great idea




That at idle it goes from 14.8 to 15.0

Is that good or bad??

 

My 440's are for a 350z, just not stock size. Are yours stock Z33?

I used stock Z33 injectors for about 6 years, they were too small (335cc) for what I'm trying to do.

 

Yea mine are stock size.

 

Those afrs are fine at idle, if you have a wideband running just make sure it stays under 15.3 roughly under load or at higher rpm and you should be ok.

Putting the stock intake on for thedrive is a good idea either way

 

So it's fine and when I'm driving it goes crazy and when I let go of the throttle it goes like past 17.9 and it jus like ••••

 

If in gear, and you are moving, and you let off the gas, it should go offscale, lean. During a WOT run, what are the readings? Any logging capability?

Also, re: the porting the LIM, if that's done, my opinion would be to port match the heads.

 

It's never a stable solid number in real world driving the numbers change with the movement of the throttle and load....but on most part when doing a WOT power pull on a level long straight away the AFR readings should be pretty stable....and yes decel and throttle lift will result in a rise in the AFR lean condition reading as stated by NMEX....relax....!

 

As Nmex said, your AFR should go full lean under de-cel because it cuts fuel off and uses compression to slow the car down (engine braking). Once you get below a certain RPM or go into neutral the AFR should return around 14.7

What do you mean when you're driving it 'goes crazy'?

Agree. I don't think port matching the heads, LIM, etc is worth the risk on this car, IMO, unless you're going ***** out racing.
A nice polish to get rid of the casting marks is fine, I would NOT port anything, just my personal opinion. I think you're more likely to make things worse trying to port stuff.

 

Sounds good I was all freaking out thinking I had a bad o2 sensor. Well at full wot it goes to 12.8 or 13.0 it varies.

No, I don't have any logging capabilities. I haven't even installed my vafc yet but will do it before I head to the tune shop.


It's just mounted haha

Another question guys will I have to tune my car again if I add my fidanza flywheel I jus have it there but my mechanic told me to wait till my clutch starts going out its still the oem one.

 

No

Yup, people are making plenty of power without that kind of work.