Taubr Unit

iTrader: (32)

heres the deal, my motor is in my sig. Headers and boltons. I put a 58mm tb on because i got it for free and i plan on building the motor sooner or later. NOW my buddy has a 4'' intake tubes i can fab up for it also. I got room for it too. Now with the 58mm and the 4'' intake tube, is there too much air or no? Everyone says a engine is a big "air pump", so i got a crazy freeflowing exhaust now cant i even it out with a big intake?

Tapout911

iTrader: (9)

It wont hurt but it may not help either. All that air has to have somewhere to go. A free flowing exhaust doesnt help a restrictive stock heads and cam.

MrCadillac

is your trans vacum modulated? if not, you better tune the trans line pressure tables for it. if the tube leading to and from the MAF is bigger than the MAF openings, It drops velosity, so the readings can be a bit off. but the RAISS intake, a filter, hooked right on the MAF, and then a straight boot to the TB, and it works really well.... so i don't see why not. get the maf as close to the tb as you can, and it will likely work the best.

MrCadillac

wait.... WHAT?!?

I'm gonna have to disagree... it won't make up for the "bad" heads and cam, but it will help it.

ulakovic22

iTrader: (12)

No such thing as too big an intake on the LT1 IMO.

Taubr Unit

iTrader: (32)

yes, i got it vaccum modded. the line T's into my brake booster. But i dont see how that would effect the line pressure.

MrCadillac

it doesn't, any more. Don't worry about that part. but basically, more air is getting thru at a lower throttle (TPS), and the presure won't be high enough at less than WOT. (if it wasn't vac modded), but your ok, since it's all done by vacum, so the trans no longer cares what size the TB blades are.

Taubr Unit

iTrader: (32)

ok, makes sence to me kinda. It should be running in a few days so i guess well see how it goes. I did notice that it idles a little higher, idles at like 900-1000 rpm. But i can adjust the idle blades so i can lower it.

Taubr Unit

iTrader: (32)

got it all hoked up tonight. runs fine but idles a little high, idles at 1000 rpm. Other then that you can hear it really sucking air in the filter!. I think it will work out really well.

emerica4601

iTrader: (5)

are you f'n kidding me? hell yeah there is. i take the word 'intake' as the actualy filter, piping, throttle body, and manifold. theres a whole velocity issue with lt1's wehre theres just no need for massive amounts of airflow into the intake manifold. you will lose horsepower. get rid of the 58mm and get a 52mm. and stay with a regular intake. there, you will gain

buffman

iTrader: (9)

to sum up the whole mess of **** flying around, you're only going to need a bigger "intake" (everything before the intake manifold) if you measure with a vacuum gauge how much vacuum you have a WOT. if you're pulling over 2" of vacuum at WOT you have an intake restriction. Whether or not it's the filter, tubing, MAF (not really a concern for f-body guys since you have a 3.5" MaF), or TB, it indicates you need more air

Taubr Unit

iTrader: (32)

first off, im not getting rid of the 58mm tb because i got it for free. Dont be jelious. Im spraying nitrous through it so velocity doesnt matter. But to be honest, the 4'' is tight fittings. So im gonna fab up a 3'' one for it. But the tb stays.

Taubr Unit

iTrader: (32)

and then whats the deal with ppl and ram air intakes. There sooo short and open, i think its less velocity then a full 4'' intake. And how the hell do you measure vaccum anyways? And if i do measure it, whats perfect vaccum?

buffman

iTrader: (9)

you get a gauge. As long as you have less than 2" of vacuum at WOT you're not seeing an intake resrtiction.

Taubr Unit

iTrader: (32)

where do i hook the gauge into thou?

blkchevyz

i dont see how velocity at the throttle body is going to make a difference. runners yes... throttle body no.

omaha stylee

Can I get a picture of how you are running a 4" CAI I am very interested to see how you even made that fit...... I will give you my email if you have pictures you can send or post them here....... i didn't know it was possible to fit a 4" CAI around all the clutter....

buffman

iTrader: (9)

vacuum port on intake. There's like 4 to choose from.

Taubr Unit

iTrader: (32)

read it and wheep!!! You are right, i barely fit my 3'' with the ABS box. But i deleted everything out so i got major room!! It basically goes down into the airdam, i cut a hole in the bottom plastic piece so the filter is actually outside the car getting nothing but cold air! And when the car is running, it sounds like i got a blower on the car with how loud the intake is sucking in air, its crazy.

MrCadillac

the ram air intakes do work. ("SSRAI" aka clear image, or RAISS) they build a slight pressure, while they collect the air and help to move it on it. I said SLIGHT pressure, not 6 psi of boost. also, that air that is being forced into the big pan(like a raiss) is pushing warmer air outta the way. it also takes away alot of bends.

but by looking at that under hood pic, I don't think one is very doable.