When To Go Bigger???

[hillhouse1999]

HEY GUYS/GALS,,

I DONT REALLY KNOW ALOT ABOUT ENGINES,EXCEPT WHAT TO PUT ON THEM TO MAKE THEM GO FASTER.BUT NOW IM KINDA STUCK.I BOUGHT AN 89 FOX LAST YEAR AND IM JUST NOW GETTING AROUND TO PUTTIN IT ON THE ROAD. OK HERES THE SITUATION....HOW DO YOU KNOW WHICH THROTTLEBODY SIZE TO BUY,WHEN YOU WANNA GO BIGGER THAN STOCK??AND ALSO HOW DO YOU KNOW WHAT SIZE INJECTORS TO GET. HERES THE MODS ON MY STANG--MAYBE YOU GUYS COULD TELL ME WHERE TO GO NEXT......


BBK SHORTY HEADERS
X-PIPE
FLOWMASTER 2 1-2 INCH CATBACK
ELECTRIC FAN
SOME MILD HEAD WORK----(UNKNOWN)
4:10 GEARS
FORGED PISTONS
B CAM
255lph fuel pump

any help would be greatly appreciated...thanks

HILLHOUSE1999

[must93]

If you have the stock intake i wouldnt go any bigger! Depends on what aftermarket intake you have/get before deciding on the TB size!

[Black93GT]

I'm running the about the same set up as you. I'm using a stock throttle body for right now. I've got a GT-40 intake, 24 lbs, adjustable regulator, and MAM to match injectors. When I upgrade the throttle body I'm thinking 70 or 75.

[Black93GT]

Check some mags our odds are someone has run a set similar to yours and tested TB's to match it

[Skip]

I would go to 24's and a 65 throttle body. Then if you add more down the road you can sell that stuff and get bigger and better stuff. Acufab is the way to go......

[hillhouse1999]

ok,, heres what ive done.


i just bought a bbk cold air intake,and a bbk 70 mm tb and egr . both on ebay spent about 200 for all. now i dont know if i need 24 injectors. a friend who does all mustangs told me that i dont really need 24"s until i hit like 300 horsepower. im not sure how many horses are under my hood. does anyone agree or disagree with the 24 theory??

thanks,,

craig

[PonyGrl420]

300 hp will pretty much MAX out you stock 19's on an n/a set up, forget about it if you are forced induction.
You can calculate what size injectors you need for what applications using this http://www.holley.com/data/TechServi...20Injector.pdf

[Black93GT]

19 should be fine unless you upgrade Heads, or Power Adders.

[SephtheOni]

Originally Posted by Black93GT

19 should be fine unless you upgrade Heads, or Power Adders.

Go for 70mm or 75mm. But for the love of god, get a different manifold.xD I made that mistake.D:

[must93]

If you are going to get a gt-40 intake dont go any bigger than 70mm T/B cause the opening on the intake is only 70mm