BLACKHAWK1998

I was told to get a F.A.S.T. LSX intake 90mm and tb. only thing i have on my car is headers, rocker arms, ASP underdrive pulleys. Someone told me that it will run like **** because of the fast 90mm lsx intake. i need to know ASAP to send them back. thanks

Arestme

i know you have to get it tuned after you put it on, but otherwise my engine builder, dougrippiemotorsports.com puts them on many cars, including the 427ci

BLACKHAWK1998

the sayed i should go with the 78MM intake and tb. wouldnt bigger be better?

SMOKIN01TA

iTrader: (10)

imo the 78 is a waste of money unless you plan on stayin around a stock power level for a long time

Mark98SS

iTrader: (1)

The 90mm is way too much air for a stock internal motor, go with a 78. An LS6 intake is just as good for alot less. That being said, I have an LSX 'cause it looks cool.

HAMRHEAD

iTrader: (8)

If you ever plan on going H/C and all bolt ons then the 90/90 setup will work great with tuning.

HAMRHEAD

iTrader: (8)

Oh yeah and don't get the fast 90 TB, get a TPIS or Nick Williams instead

BLACKHAWK1998

plan on s/c down the road

HAMRHEAD

iTrader: (8)

or a Turbo if you got the money

LS6 SS

same thing i said 78 are a waste of money if u are planing on putting a cam keep the 90

Cal

iTrader: (1)

Yeah that setup's not worth a damn, let me help you recoup some of your lost cash, sell it to me for $250.

BLACKHAWK1998

i wasnt planing on getting a cam. just a s/c

LS6 SS

then keep the intake

HAMRHEAD

iTrader: (8)

You will want a cam even if you get just a s/c. To get the most out of it get a custom ground cam.

cyphur

iTrader: (10)

and whoever said that 90mm is too much air for a stock motor......i guess all those fellas that see 15-20hp gains on 346ci LS1's just got lucky huh?

ChucksZ06

iTrader: (9)

You will be fine and as you continue to modify engine it will just get better. Their are a lot of old ideas about tb size left over from the carburator days when keeping the airspeed high through the venturies was crucial to fuel atomization. Port injection is much more forgiving in this area as the sensors and computor tell the injectors how much fuel to inject. Factory ls2 engines all have 90 mm tb and they are only a few cubic inches larger than your engine. We have your setup on an 02 camaro and it works great.

Ragtop 99

iTrader: (7)

If you are getting a S/C, I'd just save the money and buy a used LS6 intake if you have a 98 - 00 car. Unless your S/C is going to be max effort, the FAST 90mm is a big investment that you probably do not need to make now.

obZidian

iTrader: (2)

stay with it......the ls6 manifold is nice over the ls1 but the lsx intake will net more power than the ls6. Personally, the 78mm fast is not worth the cash but since you have the 90mm, you'll only see great things when you future mod your motor. with the right tune, expect a crispier throttle response, smooth idle, and whe you add the s/c, cam, h/c...watever, the gains will be twice as nice than over the ls6!!!

if anything, if you dont want to modifiy the tb which you are probably gonna have to, send it back and get yourself a Nick Williams 90mm......no problems there..

good luck!!

wrath22

90 mm intake and t.b. is too much for a stock ls1. if u do get them make sure you tune car now and then again if you had a s/c or head and cam. by just changing maf to slp maf you lean out the car more than you think every mod should be done with tune in mind. if guys do their homework they will see the true numbers. just my opinion of what i have seen at work(g.m. service tech.). but gl anyway