70mm or 75mm TB??

[seany425]

i have a bbk 70mm tb on my 02 gt right now and am wondering if i might get better gains if i up'd it up to the 75mm. I have the C&L plenum too. I orignally got the 70mm cuz i was told the 75 is for real modded engines like if they are blown or with nitrous. Mine only has minor mods so i figured the 70mm would be fine, but now im hungry for more and i wanna know if the 75mm is gonna hurt me or give me good gains. any input is appreciated thanks guys

 

[03trubluGT]

The tests on ModularDepot showed that the 75 might be worth a couple of HP, unless you are gonna start throwing serious mods on the car, the 70 will work just fine.

Matt

 

[laynlow200]

I think it's only worth a hp or 2. probably not worth the $$ for the 75mm TB

 

[stang976]

i would not move up to a 75mm if i were you. as you mentioned a 75mm is really only efficient when using a power adder. do a search as i am pretty sure people say that they lost low end torque by using a 75mm setup on a fairly stock set-up. BTW: what mods do u have now?

 

[nickthegenius]

I don't know what sort of gains you would see, but the C&L plenum is intended to be used with a 75mm TB.

 

[admdavs]

If my engine is fairly stock, but I plan on adding a blower down the line- like two years down the line- should I still go with the 75mm- or do 70mm now and switch to 75mm when I add the blower???

 

[Sick96Stang]

If my engine is fairly stock, but I plan on adding a blower down the line- like two years down the line- should I still go with the 75mm- or do 70mm now and switch to 75mm when I add the blower???

Well that depends on you. Do you want to spend the money now to get the 70mm throttle body then in 2 years buy the 75mm or do you want to have a little bit of hp lose now and buy the 75mm but save money in the long run?

 

[nickthegenius]

Well that depends on you. Do you want to spend the money now to get the 70mm throttle body then in 2 years buy the 75mm or do you want to have a little bit of hp lose now and buy the 75mm but save money in the long run?

Lose HP? My car is doing fine with the 75mm unit.

 

[Sick96Stang]

On stock cars most people say the 75mm throttle body is to big and u will lose hp. 290 rwhp like your car is not stock. I have heard that 75mm throttle body is fine even for stock cars but I havent seen dyno graphs compared between the two on a stock GT so I couldnt say for sure either way.

 

[Rocketman]

I don't know what sort of gains you would see, but the C&L plenum is intended to be used with a 75mm TB.

All the test performed by the magazines and the other forums shows the C&L Plenum works best with a 75mm TB on mildly modded cars.