i dont get it. People say that tpi is the real power source and tbi is nothing when the only real differences are fuel delivery. A sb 305 is a sb 305 reguardless of tpi or tbi wich means they should have the same power potential. The only reason the #s are differnet from the factory are becouse tpi came with different exahaust and cam (in most cases). Just a thought

------------------
Bright red 1989 firebird
305 TBI (stock)
5 speed
16x8 inch WS.6 wheels
T Tops
richmond 3.73s
Custom professionally done car audio system
tinted windows
Tail light blackouts
58000 origional one owner miles

 

This is true, but the factory TBI flows very little. You could put a low flowing throttle body on a TPI system and that system would suck. In fact, TBI is more prone to make low end torque than TPI, as TPI is tuned port injection, the runners are tuned for certain RPMs. The longer the runners the lower the RPM range, and vice versa.

I myself like TBI, I like the old car look with the open element on top. I plan on fixing up the 305 (so the 5.0 Stang guys can bitch that my engine has 48 more cubes than theirs) and putting either the Accel system which flows 750 CFM, or putting on the Holley truck upgrade w/ 2" bores simply because I hear it hooks up to the stock electronics. Plus I'm gonna need a custom chip anyways w/ my new cam/head/intake combo,

Just my opinion,

Jason

 

Its just like 89Blwn said. The factory TBI blows and the factory TPI was a little better. Why did chevy do this? Beats the hell out of me...but they did. Holley did us a favor and made a 670cfm tb unit though and a aftermarket intake can correct this as well.

 

no, GM did us the favor with the 670! thats what came on 454s holley just had to copy it

 

Well I like Holley, so

------------------
Eric Natzke
91 Firebird 305 TBI (dropping in a 355 summer of "01")
-3" custom exaust-Flowmaster 80 Series-No Cat-Edelbrock TES Headers (coated)-March Pulleys-TBI Spacer-K&N Open ELement-TransGo Shift Kit-B&M Supercooler 28,000 GVW-Hypertech Thermomaster-160 Stat-3:42 GM Gears-Auburn Posi Unit-Edlebrock Strut Tower Brace-MSD Superconducters-Accel Cap & Rotor
-Rapidfire Plugs-Pablo's Free Mods-265/50/R15 Tires-Emmison's all Gone

http://hometown.aol.com/J007Golden/index2.html

 

You won't like Holley so much when their injectors stick on you...

 

GM put TBI on f-bodys because it was cheaper to produce. I read that somewhere.

 

i like holley to

 

i like gm