ddretard

I was just wondering what I could do to my car to still maintain it's already poor gas mileage. I don't wanna sacrifice power, but would like to gain a little mileage. I know factory s5 n/a's run rich already, so would MS or maybe S-AFC help out my economy a little? Please post any mods you can think of that will either help or WON'T hinder mileage very much....

Kenteth

tell me its not an automatic...

ddub

S-AFC leaned out will increase performance, so go for that. If it's a manual then shift at low rpms all the time when doing normal driving, keep rpms low in cruising, etc, free/better mileage

SonicRaT

iTrader: (6)

S-AFC, ignition booster (MSD, crane, jacobs, etc), cold air intake, free flowing exhaust, etc.

Syonyk

What's poor? I get about 20-22 highway, 88 SE. Hoping to get that up to 25-28 soon.

The engine should be running fairly close to stoich at highway speeds - that's what the O2 sensor is for. Replace it if you haven't already.

-=Russ=-

88IntegraLS

New spark plugs (worth +4mpg in my case)
Redline MTL (driveline lubricant for manul transmissions)
Header
Weight reduction
SAFC
Stock width tires
Cold air intake + cone filter

ddretard

Yes, it's a 5-speed. I'm gonna do the exhaust and the intake right now... Should I punch out the screens in my cats, and get the S-AFC? Which setup would be best. Here's my situation. I've got like 800 to work with... 250 is going to my clutch, cause i need it. that leaves 550 for a S-AFC, an intake, and an ignition booster. I can get a used S-AFC II for like 150-200 tops, so that leaves 350.. I can get the intake for around 30 bucks, so 320... So I have 320 left for an ignition booster. I'd go with MSD, but is it easy to install. I've never done anything like this to a car, besides bolt-ons. I don't wanna **** my car up. Also, would the preset that comes with the S-AFC be enough until I can afford to get it tuned? I don't even think there's a shop in this shithole that could do anything like this. Stupid Idaho...

ddretard

Ooh. One more thing. If I buy this S-AFC that was used on an rx-7, could I skip the tuning? There's not much you can do to an rx-7 as far as bolt-ons, and the few you can do, everybody does... (i.e. intake, exhaust, ignition, electronics) What do you think? Should I use those presets?

SonicRaT

iTrader: (6)

The MSD is easy as hell to install. Check out teds website, http://www.fc3s-pro.com, or was it http://www.fc3spro.com? Hell if I know, one of those two.

Syonyk

How much difference does a SAFC really make for highway cruising? If the O2 sensor is working, the stock computer should be in closed loop mode, and running it at a fairly reasonable mixture.

The hotter spark will definitely help though. I'd do that before looking at a SAFC. Plus the standard plugs/wires/filters tuneup.

-=Russ=-

SonicRaT

iTrader: (6)

For highway cruising, not a whole lot. Of course the ECU sucks ***, and never really gets it where you want it (especially if you go up and down a hill/etc while cruising). Power wise they've been known to give upto 15rwhp on a dyno, nobody's really replied about fuel economy and their s-afc.

ddretard

Well here's the things I'm thinking of getting:

Please put them in order of priority, top being most important, bottom being the least

Here are my thoughts:

Exhaust (New cat-back, or just punch out screens)
S-AFC II
MSD ignition
New plugs and wires
Clutch (TOB is starting to go)
Intake (too wet for CAI here)

Please feel free to add any if you feel they are more important.

Thank you for your time,

Joel Hager

ddretard

All I need is the MSD 6a ignition right? NO coils or anything? I'm confused....

ddub

Jeez thats crazy. With city/highway mixed I never go above 16, average is 14-15. But of course I drive like a crazy person and am in no higher than 3rd usually

I don't really care about gas mileage in a sports car, personally. At least gas prices are going down right

Syonyk

There's a guy getting close to 30 in his...

I'll drive hard when needed, but even driving hard, I spend a lot of time in 5th on the highway. No need to be running 5k on the tach at steady speed, unless I'm preparing to pass someone, or I'm making a high speed run in 4th (late at night when I'm the only car on the road).

-=Russ=-

Phr00t

I get about 29 highway and 23 city. I haven't done any of the spark plug or ignition tune ups, running basically stock system with a k&n drop in (cai to go in whenever I have a day off work)


I also cruise at about 100 rpm higher than lugging the engine :P

ddub

Yah that's true, I usually don't go into 5th, though, on the freeway, I try to stay in 4th. 5th just feels to weak and boring, especially when I hit an uphill incline.

Sir Rupert Hobo

it's weak and boring for a reason..

ddretard

Seems like we're getting off-topic here....

Syonyk

I don't think so. Driving techniques are certainly a gas saving option. If you're hauling down the highway with the secondaries on, you won't get good gas mileage.

Also, freer intake/exhaust systems seem to help.

-=Russ=-

ddretard

I understand, but that part of the topic has previously been answered. My new question was a re-list of all options in order of priority. All of the options help me out, I just need to know which are more important than the other. Thank you,

Joel

ddretard

Also, I ***** 5th gear on the highway, I almost NEVER go above 3.5k unless i'm racing, or have to pass somebody... Hope that clears any questions about driving habits up....

locketine

I here CAI's can't get water in them because water can't travel up slopes at all.

as for the rest of the list... I think 60k tuneup (new wiring, spark plugs....), exhaust, intake, safc. I don't understand why new clutch is on ur list of mpg upgrades.

rs_1101

the word you are looking for is efficiency. when you think of these terms, and what you are looking for your question is:

how can i make my car consume petroleum in a more efficient fashion?

there are multiple ways to do this.
chemical, mechanical, and electrical

by that i mean chemical, as in ways to make your car burn gasoline more efficiently, which would include injectors that atomize fuel better, giving more power, allowing you to use less gas. also includes modification of fuel curves via safc.

electrically would be using you cars power most efficiently. this would be stronger sparks and generally well functioning sensors and electronics

mechanically, you want to reduce friction and allow the most cars power to go to where it needs to be. the ground. reducing power loss in the driveline and exhaust is very good.

these are some things to consider.

ddretard

I'm looking for a good efficiency/price ratio. I need the clutch first, cause it's going out... LOL. I don't care about WHICH way it's increased, just that's it's the most effective for the cheapest price.....