Joined: Jun 2011
Jegs MPI vs Hughes FI airgap manifold
I've read good things about the Hughes engines FI airgap manifold, especially in the increased MPG category. My new (used) 98 ram 5.9 is going to be my daily driver if I can get the MPG to a reasonable point that my wife will agree with. I'm not looking to gain a crapload of power, but don't want to lose any either. I also found this in Jegs : Mopar Performance P5007852 - Mopar Performance Aluminum MPI Intake Manifolds. Anyone installed one of these, and if so, what kind of MPG (if any) / performance improvement did it achieve? My wife is threatening to make me get a little beater car to drive if I cant find a way to up my MPG. I've done a tuneup and all of the standard things to increase MPG, just looking for some more.
You are never going to see any kind of significant improvement in MPG from any mod on these trucks. You will DEFINITELY never see enough MPG savings to justify the cost of a new intake. The best way to get MPG out of them is to keep them tuned up and not drive like an idiot. Dont fool yourself into thinking you can raise the economy of this truck by throwing parts at it. thats always a losing proposition with these things..... now a 4bt swap on the other hand.....
i have the hughes airgap intake. my mpg did go up, but only because of the other things i have paired with it. especially the sct tuner. did it go up significantly? yes and no, my city is still around 10mpg-11mpg, up to 13mpg if i leave it on the economy tune. my freeway gets up to 20mpg. i currently have it on the towing tune, so my mpg is pretty much where it was before flashing, but with more power.
why did i buy the hughes airgap? i wanted more room in the engine bay, i wanted more readily accessible distributor, a cooler degree engine, AND mostly the plenum intake fixed.
Joined: Jun 2011
RE: Jegs MPI vs Hughes FI airgap manifold
Cool, I figured the MPG increase would be pretty much highway only. I'm probably going to go with the hughes airgap and the SCT tune to go with it sometime this summer when my funds build back up a bit. I just fixed my plenum, but used the stock gasket kit to save a little $, so I know its going to blow again eventually. The main reason I fixed it on the cheap this time is because I'm planning on upgrading to the hughes manifold eventually. I'm probably going to just save up and do all my mods at once (airgap, headers, high flow cat) so I dont have to keep buying tunes, I can just do it once and be done. Also in the future is a bigger lift, gears, and lockers. I sold my toy (88 chevy 1-ton with 9" of lift, lockers, gears, engine mods) when I moved from Alaska to MS 6 years ago , so I'm glad to finally have another "real" truck.