Hey Jeff; I am not picking you out - but I am using your post as an example. If you guys have a problem with eachother, take it to PMs. These threads veer off topic at an alarming rate when 3-4 specific members get involved; let's try to keep this one on target, ok?

 

Thank you for clarifying my post - that is a large part of what I was trying to say. 2.0 second sixty foots are definitely the exception with G35's on street tires, though I think the AT's are more likely to achieve such a number than the six speeds.

Take an 07 sedan, AT, and I don't think cutting a 2.0 will be too hard, especially considering the new rear end which is roughly 12% shorter than previously.

Sean - when I quoted your time, I was doing so in response to some one stating the new sedan was 1 tenth slower than your car. I meant that 1 tenth is so close as to not be comparable. 1 tenth can be overcome by launching, faster shifting, different tire sizes - any number of factors.

 

The 5AT's are geared to max out 3rd gear at just a hair over 100mph, using the stock tire height. That's one reason why some haven't seen improved times with doing a 3.3 to 3.5 FD swap(6mt pumpkin into the 5AT). The swap reduces the maximum speed of each gear by roughly 7%, which would mean that 3rd would now top out at around 94mph. The shorter final drive will give you slightly greater acceleration, but force a shift into a much taller gear(4th) MUCH earlier than using the stock FD.

Basically, a 5AT with the stock FD will out-accelerate a 5AT with a 3.5 pumpkin over the last 150 feet or so at the track.

 

ahh, got ya sorry for jumping your case so fast i mis read it.

-sean

 

I guess I'm confused because this is what said you earlier about 3rd and 4th gears:

"Right when i go across the 1/4 mile mark i am at the very very end of 3rd gear and switch into 4th right as i go across the line..."

Now to me, that suggests that you're basically switching into 4th just as you cross the line. No?

As for crossing the line in 4th at 3,700rpms, if you're 3rd gear shift was executed at 6,600rpms and you're at WOT and approximately 101mph (mph limit of 3rd in the 5AT), then you should be seeing about 4,400rpms in 4th on the shift assuming a little TC slippage. See the numbers for yourself with this calculator. Simply input the gears and you'll get the numbers. http://www.xse.com/leres/bin/gearrat...mference=82.62


I don't agree. The stock airbox does exactly what you're describing. It's situated in a fairly high pressure area of the car. Since the stock airbox is sealed, the pressure created at the front of the box actually builds pressure in the stock airbox which offers at great throttle response and no-lag acceleration upon entry into each successive gear. The 07 intake tract goes a step further by actually situating the intake snorkels on either side of the radiator which gives an even more direct flow hence the reason for Infiniti's claims that the intake tract actually makes 3 additional HP at speeds over 60mph on the 07. If that's not a ram air CAI, I don't know what is

Having a CAI sitting in the blocked off filter area with air access from the front isn't going to help things. There is no real ramming effect because the pressure zone is pretty poor in that area. If anything, the air entering the fender is way too turbulent. The other issue that you're not addressing is the additional runner length you've added to the stock intake tract with the CAI. The longer the runner, the more turbulence it causes at higher rpms. Long runners are great for strong lower rpm power and short runners are great for high rpm power. With that CAI, you've taken away the intake manifolds ability to breath in the upper rpms. Even with AFC tuning, you can't overcome the physics of the intake tract. I've had CAIs like yours before and they deliver awesome around town driveability, but in 3rd and plus gears, the CAIs kills the topend legs.

I am curious though to hear the results of your AFC tuning because lots of VQ Altima and Maxima owners make great gains with the AFC. I just wish there was an easier way to install it without tapping and cutting wires.


Conditions? Conditions alone shed .25 seconds and added 1mph to my G and I've seen swings of .5 seconds and 3mph with prior cars. Conditions play a huge role. Other things that could influence the improvements are a better shift points, quicker 60 foots, etc.

 

True story. 3.54 gearing on my G actually made my ET fractionally slower, but it killed my mph by over 2mph. Same day testing too.

 

I was just throwing a number out there, when im doing 100 MPH down a track im not exactly looking at what RPM im at after i have just shifted.


As i said in my previous post i havnt had a real in depth look at the motor while it was in the car. I had a chance to look at the 07 350z with the HR in it and i only noticed that the air box had holes cut in it at the front..didnt notice the snorkels on either side of the radiator either...hence it was only for a second.

This i believe you are wrong, but im not sure. I was always told that with CAI you loose bottom end and gain top end...and im pretty sure its true. Everyone that i have raced at the track with short rams or stock air boxes takes me off the line, but i gain on them hard after 1st gear.

I need to have it retuned since i added my 5/16th spacer, its been almost 6 months since i have added it and i still havnt had time to tune it.

As for this all the times i have tracked the car have been just about the same conditions give or take 5 degrees, but not enough to affact my ET by .5 seconds.

-sean

 

Just because your not a virgin doesnt mean your good at it. There are always rooms for improvement like breathing for example. Great breathing = great sex

-sean

 

sorry for cutting in like this... but after reading through this post i have to say i totally agree with Nismo G, i use to be a smog tech with (Advance E/A) so i know alot about engine performance and A/F mixture

 

Do you have any timeslips for when you were stock? Have you kept timeslips as you've added mods?

I'd like to see complete timeslips myself, just for information's sake. They can be very informative. I'd be particularly interested in seeing the progression of your trap speeds.

 

I second that. I'd like know the dates of the runs and the particular track. From there we can see how much the conditions negatively or positively affected the runs.

 

I think most of gearheads know that you want to have about a 14.7:1 (Stoich) A/F mix dialing down to about 13:1 above 5000rpms for optimal performance and combustion. I don't know of us are denying that fact.

 

I dont have time slips from when the car was stock haha i wish i did that was about 4 years ago. Im sure if i did you couldnt read the ink anyways, i have time slips from this past summer and winter slips though.

Summer temperatures range from about 85-90 degrees and this winter, at least when i went, it ranged from 68-80 degrees. There wasn’t a test and tune night that i could make it to when the temperature was 50-60 i wish i could have made it to one of those though! Let me know if you want me to post time slips from summer and winter though...car had the same mods for both summer and winter.

-sean

 

Do the 07 dual intakes have resonators on them like the older VQ's?

 

This thread should be called:

NISMO G VS DAVE B

LOL