Intake manifolds

[colin5524]

Okay ,thinking to fab up an intake at some point but wondered what gains i would make here is a couple of pics from guys at ausrotary forum had on there 13b\'s


now does anyone here run an aftermarket intake manifold, and what are some of you guys FC\'s bhp?
cheers

[McCARTHY]

i will be running an after market inlet manifold with 80 or 90mm throttle body. Provided you get the sizes right you can in prove the throttle responce and horespower.

Each application will differ due to mods like turbo porting etc. What else will you be doing ot your car?

[kev-yorks]

i will be running an after market inlet manifold with 80 or 90mm throttle body. Provided you get the sizes right you can in prove the throttle responce and horespower.
 
Each application will differ due to mods like turbo porting etc. What else will you be doing ot your car?

A word of warning you can run into drivability issues with a single large throttle body! In many cases you will get just as much power but with good drivability with two mid sized ones with a slight lead on one of them to give progressive initial opening. Porting the stock throttle body and removing the secondary butterflies is also a good option with good gains in flow while retaining low speed throttle control.
Kevin

[88GT-R]

No matter what anyone tells you, it all depends on your end goal. The inlet manifolds shown are VERY good for a Drag setup. When contemplating designing or modifiying an inlet manifold, the are a few factors to conscider...pulsation being the overiding factor. This is most noticable at part throttle openings, and low speed manouvering.

My setup is currently making a conservative 430atw@0.91bar. This is from a special 13b-RE block. If you have any queries please email me at
arty26we@yahoo.com

Cheers,
John

[Brett]

Moving this to the technical section. :wave

[20B_boy]

Provided you get the sizes right you can in prove the throttle responce and horespower.

Easy to lose throttle response, hp and/or torque though too. Lots of experimentation required Try chopping about a stock plenum and/or trying a big throttle body on it and see what happens!

[McCARTHY]

yes i totally agree. Its very easy to get it wrong much more easy to get it wrong than right..... As suggested removing the secondary butterfies it the first easy option to improve the situation.

What else are you going to be doing to the car?

[kev-yorks]

Dont just remove the secondary\'s there\'s a lot of Ali you can remove as well to aid flow.
Kevin

[stuart wizy]

Ive been looking into this for quite a while now , see my pics of my inlet on project page, It seems custom inlets are usefull if your looking for really big power from really big flow,  but only at high revs then this is the way to go, the bigger the dia your runners the more cfm will flow through them, as long as your turbo is big enough to pump the air through your runner size diamater.
The problem is the bigger you go runner dia, the slower the flow or airspeed you will get until the turbo spools up, im worried that mine wont run of boost because the air speed will be that slow and the fuel wont mix with the air because of this low airspeed, also the bigger the ports the less vacum you get sucking in which will slow airspeed down  even more at low revs.
almost all really high powered drag cars in the uk are running bigger custom inlets and plenums for serious flow, check norris designs evo inlet manifold or all the 1000bhp skylines.

[colin5524]

looking for around 400bhp going to be running a garret GT42,1600c secondaries, bigger fuel pump,homemade fuel rail,frount mount intercooler, ecu wise i was thinking apexi fc, what do most guys run ecu wise? Also going for porting but indecided on how far to go any suggestions. and cheers everybody

[stuart wizy]

antnicuk has built an fc i think with a fd uim making around 400 horse, he will tell u more,
I dont think u need custom inlet for 400 bhp unless you want to build one anyway, always good to see people building and developing there own parts mate, go for it I say:Thumbsup!

[antnicuk]

You will easily get 400 flwhp and could well see 400 rwhp with a good set up, i went for the FD UIM, removed the secondary butterflies.  I only really went for this because it meant i could use a greddy elbow and the FD TPS as i have an FD Apexi with a modified loom.    Cris at reworx got 600 fwhp from the stock TII inlet with a different elbow.

[McCARTHY]

are you doing this on a TII lump or using a FD lump?

[88GT-R]

Don\'t believe everything you hear.....

[McCARTHY]

Don\'t believe everything you hear.....

this relates tooooo?