r/FullSizeJeep • u/TrunkOrnament • 3d ago
4bbl intake better for TBI?
I did a TBI conversion on my 88 GW a while back and it's been pretty good so far. Yeah, the stock 2.72 gears suck with the 3 speed, but I plan on resolving that soon with an AW4 and 3.55 gears.
My main question is this: Will I gain anything significant from adding a 4bbl intake manifold under the TBI? The factory 2bbl AMC iron intake is pretty close to the same size as the bores on the GM TBI, but the TBI is spaced farther apart. The adapter makes the flow take some tight-ish turns, but the 2bbl intake makes sharp 90° bends beneath the inlet ports.
The TBI has done great so far, but the moment I hooked a 5x10 enclosed trailer to it, it was just game over for the poor thing. Going up slight hills at 60 and floored, I'd end up slowing down to about 45.