Before the swap, I was having some problems with the 3.0's acceleration during 3000rpms' on 3rd and 4th. Everytime I would punch the gas, it would tend to studder, and then go(not too dramatic though). I had checked the codes and there were no codes other EVAP and EGR codes, so I assumed there was a vacuum leak somewhere.

So now, come to find out, the 3.5 is doing the same thing. It happened to me at the track... I was up against an STI. I was running on Mickey Thompson 22.0/8.0 slicks... We lined up.... took off... 1st was great, gripped like a motha!! (no problems with acceleration) 2nd was great too... I missed the shift from 2nd to 3rd, put third in, punched it, and the car bogged, the same way it would with the 3.0. I checked it on the way home.. and it continued to do it.

When I got home, I checked the codes and it read the MAF...
Everything is plugged in okay.
So I know i need to replace it but would it be better to stay with the A32, or upgrade to the Z32 MAF?? Or what other options would I have?

My other question:
On my first three runs at the track, I used slicks, and on all three runs, third gear kept on giving me problems.... it wouldnt go in unless I would double clutch it.
So I decided to remove the slicks and run with my street tires... the problem went away.
Is it just me or are the slicks the problem!?

 

Slicks causing a hesitation in acceleration in higher gears?

 

He's asking if the slicks are causing the 3rd gear crunch issue.



As for the MAF, i'd look for another A32 unit. They are good for 350 BHP.

 

Maybe you have a short in your MAF wiring.

 

I know what he's asking, but "crunch" kind of makes sense. Maybe the slicks are bringing out a problem that isn't as evident on street tires?

 

Would it possible that the slicks are too much for my clutch?? I had thought about that but then started doubting it because I think if that was the case, it would occur more on the take off than the top end, right!??

As far the MAF, I ended up checking the voltage:
At idle it reads okay, less than 1 volt(dont remember how much exactly)
When I start the car and increase the rpm's, it goes up to 1.7 and once it reaches about 2800-3000rpms, the voltage drops back down.

I think(and really hope) this was the reason for my wack times last night!

 

Voltage drop = dying/dead MAF. Stick w/ the A32 MAF like nismology stated.

 

Do you have either underdrive pulley and/or lightend flywheel on your setup in addition to an aftermarket clutch?

The reason I'm bringing this up is because I used to have this issue on the tracks also. Whether 3.0 or 3.5. Replaced UDP to stock, fared a bit better. Then swapped to 5th gen AE clutch and the problem was completely gone. In my words, I'm implying a harmonic balance issue. I'm doubting that the aftermarket spinners on either side of the engine are balanced to operating spec at all. Fidanza flywheel won't be an issue, because I spoke them then, and they guaranteed a complete 3 stage balancing post machining before boxing them up for sale. Our Nissan OEMs are doubtless to my "feel".

Just bringing a point across here. It may not be your problem at all.

-Peter-

 

Or, if you're short on cash, go to the junkyard and buy a 3rd gen MAF, and wire that up...

 

 

I got mine for 45 shipped off of www.carpart.com

Beengoing strong for over a year (20+K)

 

Are you reffering to the issue with 3rd gear or the issue I have with the bogging out?
I have the Unorthodox underdrive pulley and a Fidanza flywheel...
Before the swap, I had the original flywheel with the UDP and it still had that studdering affect.

I have a feeling that my shift linkage might be loose and that may have contributed to the 3rd gear issue(not sure why with just the slicks though).. I was noticing that when I have it in gear, the shifter still feels loose(has some play)..
I still dont want to give up on the slicks because aside from missing third, and bogging out real real bad, I still ran a 14.8, which out here is GREAT!!(high elevation)

I think if the run was smooth, I would have been able to run a 14.2-14.4--