Throttle Body size?

Jedi276 · #1 06-09-2003, 01:49 AM

I just recently ordered a cold air intake system for my '01 GT and figured while installing that, it would be a good time to put in a new throttle body. What kind is best, I was looking at BBK, and what size is best, the 70mm? Thanks for the help.

BigDanTheMan · #2 06-09-2003, 03:46 AM

i was thinking about putting on 70 mm on my car, i can't imagine why not - for some reason everyone seems to keep it at 70 or 65. greater then 75 won't really do anything with out crazy mods. be sure that you do more then just a larger throttle or else the benefits will be minimal. and too big of anything on the intake or exaust could result in "diarrhea of the engine" - that is to say too much flow that leads to a loss of low end torque.

oh yea - don't forget to get the appropriate spacer to go along with the throttle body.

Los · #3 06-09-2003, 09:27 AM

70 is fine. Also, look into getting another mass air meter. Its supposed to help out alot!

fatninja19 · #4 06-09-2003, 11:31 PM

Under the same driving circumstances, would the larger throttle body and mass air sensor hurt gas mileage at all?

BigDanTheMan · #5 06-10-2003, 12:19 AM

I havn't made the change myself, but it would make sence to me if gas mileage increased slightly. On one hand the more air makes for a better fire, but on the other hand what the fuck do i know?

but keep in mind that just replacing the throttle body and spacer won't suddenly open your car up, you've got to balance it with a change in the exaust manifold or a post-throttle body intake flow enhancer.

big words are fun.

GTStang · #6 06-10-2003, 01:01 AM

TB,CAI, MAF all will help but also big gains can be had by potring and polishing that pretty metal box that sits on top of your plastic intake manifold.

Los · #7 06-10-2003, 01:34 AM

I don't think a bigger MAF hurts anything if its the right size. Shitty injectors (clogged, otherwise), overreving, racing the fuck out of it, gears, and prolly cams and other shit would hurt your gas mileage.

Just spray the damn thing.

BigDanTheMan · #8 06-10-2003, 02:36 AM

yo los - you keep saying "just spray it" what does that refer to?

HiFlow5 0 · #9 06-10-2003, 07:57 AM

Quote:

Originally posted by BigDanTheMan
yo los - you keep saying "just spray it" what does that refer to?

He's talking about the "juice", more commonly known as Nitrous Oxide.

Quote:

Originally posted by GTStang
TB,CAI, MAF all will help but also big gains can be had by potring and polishing that pretty metal box that sits on top of your plastic intake manifold.

You know I just read about that too. I'm going to have to look it up again and see what kinda gains were achieved.

jlhall_10 · #10 06-10-2003, 09:56 AM

Quote:

He's talking about the "juice", more commonly known as Nitrous Oxide.

How bad does nitrous hurt engines? Ive been thinking about getting a 50-75 shot bottle, but i dont want to destroy my engine. Id only use it at the track, maybe.

BigDanTheMan · #11 06-10-2003, 01:46 PM

i know that the block can hang with NO2 if the bursts are short, be sure to run extra high octane, 92+ to be certain that all of the no2 is burnt up. In california the highest grade you can get at the pump is 91 and my friend's old 67 gt didn't burn it all up and some excess no2 got into the upper manifold and blew that shit off.

Highflow knows all about this shit - wait for him.

Los · #12 06-10-2003, 03:27 PM

My best friend runs a 150 shot. He recently took the motor apart for port/polish, just overall head rework. He didnt' have a problem, only one backfire which crumpled his K&N filter as it smashed into the front of the car in the engine compartment. As soon as that's done, he thinks he can push a 175 shot.

I think he's going to melt his heads, get pissed off, and start bitching about how his life sucks.

HiFlow5 0 · #13 06-10-2003, 04:05 PM

I don't see a problem with running a 50-75 shot occasionally, depending on the motors current condition and all. If the motor had high miles and small problems, I would think twice about it.

I think ZEX makes the easiest and safest kit to use. It's just nitrous and not fuel/nitrous mix.

Take a look at this, here's what happens when you get a nitrous backfire. Ouch!

jlhall_10 · #14 06-10-2003, 09:48 PM

I was actually planning on getting the zex kit, and the highest gas ive seen around here is 93, and its hard to find. Its usually 92 though. My intake & exhaust runners have been ported and polished.

GTStang · #15 06-11-2003, 01:50 AM

A stock 302 block can handle up to 150hp shot if you get the right kit. Avoid any wet system that is not a plate design. Also run highest octane avialable, step colder non-platinium plugs, bump timing down 2 degress per 100hp added.

Hi-flow: porting that intake box gives around a 15hp gain. If anyone is interested let me know I do them for $40.

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