jc1

I have a 88 gt 5.0 b303 cam gt40p heads gt40 upper and lower intake t5 trans 410 rear. with stock throttle body and injectors. whats the thoughts on bigger throttle body or injectors. thanks

dawson1112

Waste of money on a gt40, cam only setup. All the bigger throttle body will do is loose you torque on the low end because your slowing your intake air down. The stock injectors are good to about 325hp so you got a long way to go before those need changed. Youd be better off taking that bit of cash and upgrading the rear control arms.

88 orangepeel notch

+1 ^^^

Or save your money for a REAL performance upgrade........... ABBA's Greatest Hits collection, my car always seems faster when I crank that.

dawson1112

88 orangepeel notch

I'm more of a "Dancing Queen" kinda guy myself.




I think this thread has taken a wrong turn somewhere.........lol

jwog666

yikes ABBA lmao. good rule of thumb is that unless you go up with compression ratio, displacement, or go forced induction, larger injectors do nothing. the extra added fuel requires added air to keep the ratios correct and make power, otherwise the pcm just cuts back injection ms and you inject the same amount of fuel as before

yurizx6r

^^ Wow. My mother in law listens to ABBA. I just have "Ice Ice Baby" on constant loop in my fox. lol

To answer your question if you're hell bent on doing it, go with a 65mm and 24 lbl injectors, but I'm not absolutely sure you will need 24's with your setup. But it will not hurt to put them on.

65mm is the best for your setup because you only go 70mm if you have really good heads, cam, and intake, and you only go 75mm if you're forced induction like a supercharger or turbo. If you go 70/75mm, you could actually get less power than with the 65mm from what I hear, but I have no numbers to back this up.

87 T TOP GT302

Is your car speed density or mass air? If not mass air change that.
Second I'd go with 65 0r 70 mm throttle body and 24lb injectors.