well after getting minor n/a bolt-ons (k and n typhoon, stillen true duals, kjr crank pulley, and 5/16" iso-thermal) i cranked out 228whp on 4th gear and 242whp 3rd gear for my 5AT.

https://my350z.com/forum/engine-and-drivetrain/214469-dyno-d-my-5at-w-minor-bolt-ons.html

i'm not sure where to go from here. i was thining of cams but the cost turned me off, plus my wife and i were planning a trip so that's out. i was looking into a header set up like DC (since i live in cali, CARB approved) and find a place that installs for $300-$400 found a few here in l.a.). my a/f ratios were pretty solid at 13 all the way through 4.5K rpm .....then from 4.5K rpm to 5.5K rpm my a/f ratio was close to 14. some have suggested a reflash. but with my a/f so close to 13 would i even benefit a tune or just keep adding more breather mods? a TS flash is $595 in torrance. i'd try utec but the closest utec tuner is around 70 miles away and i can't seem to find a unichip tuner around or know of any, plus with my light mods i don't kow if i can justyfy getting a stand alone.

let me know what you think...

 

Before you get a reflash or utec you should get test pipes or hi-flow cats and some headers then think about the utec.

 

5AT? Do the 3.5 Gear Swap, BEST mod I have ever made.

 

no 3.5FD yet. was thinking about it but don't know who to trust to do it around l.a. i hear it cuts down your top speed? your expereinces?

 

It reduces your top speed to aorund 160mph from 170mph, but you get there much quicker.

 

how much did you pay for the swap? i didn't know it was only a 10mph difference (aren't we all limited to 155mph anyway?)

 

3.5 Fd Made Me Feel Like A Owned A New Car, Big Differnce In The Way The Car Pulls.. I Have To Shift About 5 Mph Sooner From 1st To 2nd At About 31...2nd Gear Takes Me Above 60 And 4th Gear Pulls The Way 3rd Use To W/ The 3.3... I Have Not Maxed Out Top End, But You Will Still Hit The Governor I'm Sure..it Is Just A Swap, Would Be Hard For Someone To Mess That Up...go For It. You Will Be Happy !

 

I Purchased my Pumpkin Outright, Most folks that are FI will swap for free. (Just remember to change your oil while its out, about $15) Takes a couple of hours if you have some simple tools.

 

You Can Do The Swap W/ A Friend In A Few Hours... Or Pay Someone, No More Than $200.00

 

so forget the tuning and breathing mods and go right into a 3.5FD? performance nissan used to have it on their website but not anymore. know where i can find one?

 

Just make a new post asking if anyone in your area wants to swap yours for theirs. Most people have a taker within a week.

 

Will the swap mess up the Spedo, VDC and any of the other stuff that reads that info like cruise control?

 

No. The 3.5 Has no adverse effects on any of your electronics.

The only reported differential problems are some folks lost cruise control when switching to the 3.9 on a 5AT, but no problems with the 3.5

There are two versions of the 3.5 Pumpkin, Open Diff and LSD. All Z 5ATs are LSD.

 

Will the 3.5 Z pumpkin work in my G, I have the factory VLSD? And what sort of real world 1/4 mile benefits are we talking about, a few tenths?

 

Yes, a Z diff will work in a G. And yes, from what others have said, you'll probably drop .1-.2 sec in the 1/4, all other things being equal.

 

i got mine from a 6m z,but be carefull the newer cars have different companion flange.make sure to get the same year pumpkin.try these guys,
www.car-part.com

 

if you're going to be swapping anyway, why not just go for the 3.9 and max out your potential? just wondering since i will also be doing this sometime in the near future.

 

When searching on car-part.com what do I look for? Differential Assembly?

 

Based on what I read 3.9FD will kill your MPG, especially on the street.

 

i just ended up calling them.