new parts and a question or two

infamous209 · Jun 30, 2011

So about a month or so ago I went on a quest to get more MPG and more efficiency out of the Mustang. I started by cleaning the MAF, throttle body, plenum, and IAC, and that got me for 17.5 all around to a surprising 20 MPG, I was very happy with that but wanted to see how far I could get. I then purchased a SCT, and with that I got 21.5 on 87 octane. Now I just bumped up to the 91 tune and dropped in a MAC cold air and am hoping to see 22.5-23 MPG. Now from what I have heard my next thing should be a throttle body and plenum, (mind you all this is also to bring more power), but I have been told to polish out the stock tb and plenum which will cause it to flow like a 70 mm, has anyone tried this? Also what do you guys recommend besides the obvious PI swap? Thanks in advance :thumbsup:

DropTopPony · Jul 1, 2011

Back in the old days

we used to port and polish the upper plenums and get spacers to add 3-4 hp but messing with the stock TB's were supposed to be bad because they have a coating on the inside to help prevent buildup etc from sticking. Never really gave it much thought because once the aftermarket stuff came out we stopped messing with the stock stuff.

infamous209 · Jul 2, 2011

Thanks I think ill just wait and buy an aftermarket, I cant believe the MPGs im getting, right now it seems im on track for 23 but well see.

Willis_98GT · Jul 3, 2011

infamous209 said:
Thanks I think ill just wait and buy an aftermarket, I cant believe the MPGs im getting, right now it seems im on track for 23 but well see.

Going pi will even be better for you, as long as you have all your sensors in working order with a good tune 20-25 is easy to do. thats what my car averages with nasty chopping comp 270s and pi heads

infamous209 · Jul 3, 2011

PI would be really nice but with the wifes car needing a new motor thats a lil out of reach right now and when I do it I am doin the whole motor swap.