To start off i would like to say Hello to everyone.....I am really new to this era with Infiniti....i have moded cars before taking it to the extreme...But at that time i had a VW Jetta 2.0t/Vw Jetta 1.8t.....I lost both cars due to Accidents one involving someone hitting me and total my car...Insurance not being able to cover or want to pay for a FUlly MOD jetta..that i took from only v4 150 hp/To a wopping 325 hp V4..WOW...but i wasted thousands of dollars and i dont want to spend that much again...My second to same...so i deciede that it wasnt worth all the speed anymore...i got a 05 G35 Sedan Auto...i may say i like the fact it is RWD and 267 HP stock....so i am ok with that...Needless to say i am a speed demon and i love SPEED..so i am trying to figure out can i reflash my ECU to get more hp on a AT transmission..and would i have to worry about my Tranny going bad since i have a A/T....i just need alittle more speed and not spend TONS of money...i dont want cheap parts either..so it is a catch 22 with price...but i am really looking for someone who has experience who i can lean on with information....someone helpful and wouldnt mind helping a Newbie with info..

 

Welcome
G35's are not one of those cars where your going to get 30+whp from just a flash, With no mods at all i will be surprise if you get over 10. Normally we do all the n/a mods first and then get a reflash or tune.

You can start with a Motordyne spacer and a motordyne exhaust for power. ~1600 at most.

 

Do you want the good news or the bad news first?? Our engines are tweaked pretty well from the factory so any significant power increase will cost many thousands of dollars. There is too much information to share in one post so I'll direct you to this thread:

https://g35driver.com/forums/g35-sed...an-thread.html

Forced induction is the only way to get serious power. You can spend a couple of thousand dollars in bolt-ons and a tune to gain maybe 30 more HP.

Search this board for the knowledge you seek. It's the best forum for G35's on the web.

Congrats on your new purchase.

 

@bestswat......u do have to remember i do have a A/T tranny would i really be able to do anything with this engine since it is a Auto v6....i mean i really dont know due to i only driven manuals and this is my first A/t v6...i mean could i really gain power without Blowing up something...and could i upgrade my tranny auto to handle the power...i am interested....very interested....(CHecking bank) HERE I GO AGAIN..LOL

 

Check out the FAQ thread sticky to start.

 

Two logical choices.

Build up slowly by getting small bolt on's and enjoying as you go and getting an ECU flash when everything is said and done. Get some gains not a ton, but noticeable.

OR

Go FI and get it quick but its going to cost you thousands.

Also the AT should hold up as long as you dont beat it none stop.... like anything else though the parts are rated at a certain level so over time your car may deteriorate from the large amount of power. All depends. You can upgrade internals and tranny but its going to cost a pretty penny

 

To get any decent gains N/A it is going to cost a lot too. You are much better off going with a low boost setup on the stock block and getting a great tune. Lots of options depending on your budget.

 

Doesn't really make a difference unless your going FI. Your tranny will hold up. And believe me you will never reach FI power with just bolt-ons, not even close. So your good to go, the G35 is not a turbo'ed car remember. It's when you go FI, that's when you have to upgrade the tranny(valve body upgrade,clutch packs,tranny cooler etc..)

What you can do is get a
Final Drive(3.7-3.9) with LSD(Quaife)~1500-2000
Full exhaust[Motordyne y-back exhaust w/ XYZ pipe, Motordyne Testpipes(when they come out), Tomei;Crawford;Long tube headers ~1700-2500
Intake (JWT,Stillen,Fujita)-they all net around the same. ~200-250
Spacer-Motordyne 5/16 spacer ~200-300
Cams ~600-1500
and then a tuneeee

In conclusion were looking at a price of a FI kit once you add everything up and your not even making near the power of a FI kit, so with that said if you want power i suggest you go FI with very low boost. Maybe a supercharger because they are easier on the AT tranny's as oppose to a turbo.

 

To answer your 5AT longevity question, the JATCO 5AT is basically the same unit found backing the much more powerful Q45 and Titan pickup/SUVs. I believe the 5AT in the G35 is rated 320ft/lbs of torque. A typical bolt-on VQ35DE will only make about 250-260wtq, you're going to be well within the toruqe limitations of the tranny. I strongly recommend doing a full transmission fluid drain (about 10QTs) and then doing tranny fluid changes (about 3.5QTs) every 15K miles or so. Heat is the killer of most any automatic. Keep the fluid fresh. Most importantly USE Nissan S-matic transmission fluid. No ifs, ands, or buts on this one.

Keep in mind that if you do drive the car aggressively all the time (ie lots of high rpms up/downshifts, brake stall launches, etc) the tranny will have reduced life, even if it can handle the power.

 

Add a higher stall TC to that list as well because cams will nueter low end power, even with the gears. Also, if you add cams, you'll need to upgrade the oil pump and at least the rod bolts because the powerband will upshift into the 5000-7300rpm range and the VQ35DE needs some help living at those rpms.

 

All the VQ's make at lest 260ft-lbs, the rest is lost in drivetrain loss (tranny, driveline, rear end, etc). 320 ft-lbs out of an NA VQ motor is easy.

I agree about the final drive upgrade but a new rear end + quaife + install will be more than 1500 for sure. $2k is a lot closer. Also note that your rpm will be higher for the same speed in any gear so your mpg will go down.

 

Not really. You're not adding displacement. A 20 to 25ft/lb gain is about the most you're going see with the typical bolt-ons (spacer, exhaust, headers, ECU). Many mods simply fatten up the power curve, but don't really add significant peak torque. Additionally, many mods improve mid to upper rpm breathing which mostly adds HP, not torque (ie power gained by rpm, not displacement). Turbos, SC, and nitrous are differently animals. They behave as displacements enhancers and greatly increase torque across the powerband.

 

SOo much to grasp on this A/T....but sounds like a chance i am willing to take.....LOL..Checking budget i am good for about another 7-8 grand...hmmmm

 

so...starting with the little bolt ons for a A/T .....hmmm

 

what i do want u to understand that when it comes down to this car and mods i am serious with it......i checked the site for like mods for a automatic and i really dont see anywhere like step by step.....exp i am already getting coils and rims...next after that would be breaking and mounts and strusts......or am i going all wrong...