Join Date: Apr 2009
Location: jacksonville, NC
pjg1173 is offline
Re: bigger tbi??
^x2 a 454 tbi is too much for a 4.3 and you may end up loosing power due to the big bores reducing air velocity entering the plentum. 4.3, 5.0, and 5.7 flow somewhere in the area of 450~480 cfm. with the ultimate tbi mods you can get it better flow charicteristics. the 454 tbi flows in the ballpark of 670 cfm. I'm running a SBC in my other truck rated at 400 hp on a holley 650 and it hasn't ran out of air yet. matter of fact I noticed a performance increase when i switched from a 750 down to the 650. a good way to tell if you need a bigger tb is to monitor your manifold pressure. if you are seeing 100 kpa (0" Vac) WOT at peak RPM its the right size already, so Unless you plan on boosting this thing you are wasting your time.
Bigger tires and traction adders just means you get stuck in more inaccessible places.
87 4Runner, SAS, 15" spring lift, 3" body,409 Hp chevy 355, 5.29 gears, 38.5x15.5x15" TSL's
93 S10, SAS, 12" spring lift, 4.30 gears, F/R lockers, 36x12.5x15 TSL's, many more mods
05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,
00 Jeep Grand Cherokee (Daughters)
04 Chevy Colorado ZQ8 (other Daughters) 3" drop, 235/50r17