I own a 2000 Corvette and need advice on Changing the Throttle Body to a Larger mm. ?

Question

I own a 2000 Corvette LS1 and am thinking about replacing the stock Throttle Body with a 80mm or 90mm Throttle Body. I have heard good things and bad things and am not sure what to believe. Some say ill get substancila air flow and increase my HP and others say ill lose low end tourque and velocity and that that much of a mm is unnessessary. Also will this effect my cars drivability, I use this car as a daily driver and dont want to mess up throttle response or idle.???? HELP!!!!!!!

Answer 1

My father is a Corvette collector and mechanic/restorer, he says to go with Hambone's advice. There is no sense in replacing the stock throttle body unless you are willing to shell out some money for other modifications. And, if you are it is best to do it all at the same time. Basically, changing to a larger mm will have little effect and be a waste of money (w/o the other mods). His advice wait until you have about $2500 to put into it..or buy the parts one at a time and put them back, and do all the mods at the same time. He recommends borla stinger exhaust system with crossover pipes and the shorty for the manifold. He says to get a new shift eliminator, those run less than $50 and you will need one. I hope this makes sense, I am trying to relay the info the best I can, it is all greek to me.

BTW...he says dodgeman don't have a clue as to what the heck he is talking about. Not my words...

Answer 2

Don't bother. A larger throttle body will give you the potential to make more power, but without other modifications, you won't receive any benefit. An easy way to prove this is to tap a manifold vacuum port (not ported vacuum) and stick a vacuum gauge on it. (with a hose extension so you can see it while the hood is closed) With the car driving down the road and the pedal on the floor, the gauge should read 1 inch or less of vacuum. If it does, then there is no restriction in your intake and a larger throttle opening will provide no benefit. And to make sure you have a manifold rather than a ported vacuum port, there should be the highest reading on the gauge at idle, and will drop off momentarily as the throttle is snapped open. Ported vacuum will not be present at idle, but will increase as the throttle is opened.

Answer 3

i own a repair shop,,and an 80,mm wont effect the idle and throttle response that much,and it wont hurt the top end of it either,,the only way a 90 mm would help you would be if you was going to run it wide open all the time,,other wise it will hurt your take off a lot,,,but the 80 does real good,,you need to use a performance chip also,,this will help advance the timing up,,and make it accept the 80mm other wise it may stumble when you take off a little,,good luck hope this help,s.

Answer 4

I've heard the same rumors. Here are two sources to find out more info:

Most after market Corvette catalogs offer tech help on their parts. Call for technical advice and to know what other parts you will need or if there are any hidden problems. The tech guys usually don't work on week ends or after reg business hours.

Corvette forum is a fountain of information from vette owners:

http://www.corvetteforum.com/

Answer 5

if you look into a throttle body spacer they will do the things your looking to do without changing any settings work great