Mach 10

What size throttle body do I need? This is for a 90 GT

I'll list all my Mods, if not listed it's still stock.

Vortech V-2 Supercharger
24 lbs injectors
C&L 73mm MAF, Cal'd for 24lbs injectors
Adjustable Fuel pressure regulator
3.55 gears
MAC Catback
255lph internal fuel pump
Short throw shifter

Awaiting install:
Subframe connectors
Upper/Lower Control Arms
Lower Springs (May change to Drag Springs)

Possible future mods:
Intake manifold

wildstang87

go with a 70 and plan on upgrading the intake manifold next.

Quik

65mm

92hatchLX

It depends, do you want more of a top end gain, if so go with the 70mm. Otherwise go with the 65.

wildstang87

with the blower im inclined to say port velocity wont be an issue thus the reason i suggested the 70MM instead of the 65MM. this is an arguement that will never die, so i wont argue it. i dont see the gain from going to 24# inj., an intake swap, a bigger MAF, and then using a 65mm TB, especially with a blower. the 65mm will give you more crisp throttle response, but thats it. And 1991_conv that wasnt a very knowledgable answer, do you really think 5mm will give you more top end power???? it will make the powerband a little narrower, with peak HP higher in the range. but hey, its all up to you, everyone has an opinion.

92hatchLX

Not from personal experience no, but I've been told by many that the 70mm is better for top end performance especially on a mostly stock car (which in this case no) and you're right that probably wasn't the most knowledgeable answer. The 70mm (or bigger) is the prefered TB for someone who's wanting to aim their powerband a little bit higher.

wildstang87

exactly, now youre getting it, well kind of.

dc_mann8

imo only go 65, but you should really get a intake manifold, a 70 or maybe 75 mm, and a bigger MAF

92hatchLX

I'll never get ahead lol [:@] What am I not getting now?

Quik

i think junior here is finally catching one^^^^ good job

i stated that 70s are good for topend and for teh same reason the wild discussed

i chosse 65 in this case for cause its a stock motor and will make its power down low and along with 355 gears it should have decent pull


but in the end a juice fed car will still out run this setup