FX45 = 4.5 Liter V8
G35 = 3.5 Liter V6

Bigger engine = Bigger Throttle Body

 

here we have a @700whp G35 with a lot of mods, the mechanic of this car is keeping "the secret" I think it because if you enlarge all the intake tubing to fit in the 90mm Fx 45 TB an you install too the new Mrev lower plenum with the upper 1\2" plemun, beleive me that you will have a big increrase of power but only if you are FI.
( im pretty sure this car has this mod , but it is like a secret )

when i ask him he look at me and didnt confirm or denied it he says ( maybe??) yeah sure rigth.

 

BTW, the same happens to and acura RSX - you install a CRV complete TB with the plenum with intake and Boommmmmmmmmmm!!!!

 

Stock MAF sensor's placed into larger diameter tube's yield signal's that the ECU cannot understand. Some cleaver reprogramming has to take place to get around this. I know of at least one fried engine where the owner thought they had it down. Most if not all the throttle body discussion's that have taken place on my350Z.com do not paint a convincing picture that the mod is a source for tapping a hidden well of power gains.

 

If you use and AEM computer you can control that and some other dificult things like "The maddddddddddd" VDC. But like the other guy says in this thread " this is for serious power and serious money too" if you dont have real good power like a "MODDED" Twin Turbo system boosting real psi's you will not need, see or feel this.
For this to get work you will have to do all the intake components, all the exhaust components and all the electronics, fueL managment etc. in others words.... almost all around the engine have to be really mod including the internals.. Like i said this is for serious power ( 600 whp or more )and serious money ( ABOUT $20.000 from the very begining including more brake power and a very stiff suspension )( add $3k for bi rubbers and wheels to keep the power on the road) this is like a 5 stage process, im going by the 3rd stage and already use over $10k and no wheels - my next step is the internals and fuel re-managment , about $5k more - final step is the big boys grand finale - here is where the mechanics begin their secrets..... internal swaps , mods, turbo upgrades etc.. TRANSMISSION TOO.. HUFF THIS HURTS YOUE WALLET AND THE ROAD.... INSANE

 

All you have to do is unplug your YAW sensor and no more trac control under console just behind shifter on trans

 

FX45 “does not” have a (90mm) it has the same as the g35 because it doesn’t need to be larger it is sufficient up to 450hp after that you’ll need to get a different set up do the intakes design... & m45 , Q45 do not have a 90mm? Not sure what Nissan has such a huge Ls style throttle also their electric not cable if you look up vk45de race engines you will see the setups for 500hp are completely different . I have made long tube headers 3differnt intakes I’m having it flashed soon I’ve also put o2 sensor extension with limited flow and disabled 4x4 solenoid and at rear wheel 363hp with higher octane fuel 100octane and that’s about what I am going to get with out swapping air/fuel delivery and a few internals as well as computer

 

wrong these engines have the same throttle body 70-75mm !!