Intake Manifolds and tb's

[coston]

I'm looking to buy an aftermarket intake manifold and am wondering if there is a huge difference between running itbs opposed to a single. Are the itbs really that much more restrictive? I was interested in a hyper tune manifold and was also looking at the Nismo ones. Any other recommendations? Ideally I'd like to increaSe power, and response, from what I've read the greddy is goodie power while the Nismo one for response. What are the other members on here using and have you seen a big difference?

[r33_gtst]

Depends what you wanna do with your car
Twin turbo, quick response -nismo
Big single, top end power -greddy

HP goals?

[gtrjon]

if your looking to go single tb only quality options imo are rips and hypertune. that being said get ready to fork over 2k+. From what ive read on the subject of itb vs single tb the response difference is minimal. the power gains are also minimal. if your under 800hp oem is just fine as long as you add a little more fuel to #6

[coston]

My hp goals are under 500. I want to stay with twins I'm pretty sure. I want a replacement for the oem intake mani and don't really want to change a whole lot if I don't have to/won't pay off. Just wasn't sure if there was a big advantage of going from itb to single. However I do want a quality piece which will fix the leaning out on #6 cyl. But it seems like every aftermarket piece, minus the eBay ones, have addressed that. Just stuck on which direction and company to go with

[Goodlucks7even]

Go with the NISMO unit, the only problem, you have to remove the engine in order to fit it.

As for the its, i'd stick with the oem ones.

EDIT : http://www.nismo.co.jp/en/products/competition/engine/pdf/int_collector.pdf

[MattiasJacobs]

Spend your money where it counts. I doubt you'll even notice much gains when staying under 500 hp.

[xcye]

One main benefit of single tb manifold is that it is easier to tune with MAP sensor.

[r33_gtst]

Under 500hp your probably good with stock intake manifold. I'd spend the $ on good dump pipes/air intake and turbo manifolds. Under 500hp I agree with previous posts, the response will be so minimal it won't be worth it. Good exhaust, upgraded front mount intercooler and upgraded piping from turbo to intercooler will get you the best results.
Upgrade to N1 turbos and crank up the boost

[Goodlucks7even]

Stock intercooler is the best under 500hp. The less volume it has, the better will be the response.

-stay ITBs
-get tune by someone that knows how GTRs works
-hard piping kit, divided twin turbo pipe

is what you want for the intake side.

[coston]

My turbos are already larger then Stock and my intercooler has already been upgraded. I was planning on staying MAF so I guess going single throttle body would be completely pointless for my application. I'll look into the hard piping. Intakes are also taken care of for now however they're the hks green mushroom filters. I remember seeing a post here comparing the different intakes and filters but can't remember which two out performed the others. I'll have to search for that.

[cortexx]

I agree , if you want a responsive 500hp or under go the n1 turbos and keep the factory intercooler , crank up the boost , stick with factory manifolds and throttlebodies , do the exhaust , replace the intake and exhaust gaskets with stainless items , get someone to tune it , get a basic wideband to keep an eye on things .

The nismo plenum evens out the airflow to the cylinders, something the factory plenum doesnt do very well leading to leaning out of rear cylinders . by doing this it also drops the temp of the rear turbo helping it live longer and reducing heat under the hood , slightly increases fuel economy (like we really care about that) and increses response minimally (but in my opinion every little helps when it all adds up).

[coston]

Thanks for everybodies help, this is all really great info. I need to find out what Garrett pieces are currently in my car, but they are definitely not stock. I may already be half way to what I need without even knowing it haha! I haven't really driven or worked on the car for almost two years now, ive definitey got a lot of work ahead of me but with help and information like this I think I'll manage!

[r33_gtst]

Under 500hp and going the N1 route with oem items you will have significantly less issues than of you went with a big single and 700hp. Your oil and water pumps are good for your goals. Crank collar wouldn't hurt.
Power fc or better stand alone ecu and a good tune will show good numbers.
Anything more than 500rwhp will take longer to get that power out, higher revs and turbo lag
I think twin N1's and 500hp will be a good match between response and power.

[caliber676]

And what would be suggested on the intake manifold for say 600hp?

[cortexx]

For 600hp and above you have to consider alot of other things before your intake plenum . There are cars with 1000hp that run a factory plenum if you look .

The best appproach for you is do alot of reading on here , absorb as much information as possible and make a firm decision on what you want out of your car in the end. Form a plan of attack , figure out your budget and then see what you can afford.

While i was waiting for my car (for like 5 months) i read just about every thread on these forums that were less than 3 years old . There is an absolute wealth of info and a ton of guys that have forgotton more than i know !

Most stuff has been covered but asking never hurt anyone although people get a bit jaded when someone asks something that has been asked a million times before.

Before suggesting options for a build you must decide on the goal , without the goal any advice will probably be bad advice.