I searched around but really coudn't find a solid answer. I just installed the MMW header/spipe with the s/c and for some odd reason ive been getting slightly better gas mileage which is leading me to believe that im running a little lean (I'm using the cel fix attatchment on the spipe not to throw a cel).

Anyways, im worried that if I put in the nst s/c pulley and boost 9.5lbs that ill be running too lean. Anyone know? Thanks.

 

there's really no way to tell for certain unless you get a wideband o2 gauge. i'm not an expert on the s/c side of F/I, but haven't people done this upgrades without modified fuel tuning? or not? either way, better safe than sorry.

 

yeah really, get an A/F gauge. That's what I'm planning on doing even with my S/C. Some people might say it's over kill, but safe is better than sorry...

 

For sure get an A/F Gauge, it'll save ya in the long run if something happens...

 

Yea, i already have the glowshift gauges but i need to get them in. Im gona try reseting the ecu, letting the car idle for ten minutes and then breaking it back in for 500 miles and see if im still running lean (basically reset the long term things).

 

the only problem with a glowshift a/f gauge is that it isn't wideband.. your readings will be very generic (lean, stoic, rich) so you won't really have a good idea if your tune is actually safe

 

Yea, i read up on that i just don't have the money to dish out for a wideband. There are a ton of people running this pulley so i know that the trd tune is fine and i know of one guy with a header and pulley and hes fine as well so i guess its ok,..

 

Dont let the car Idle for that long, its not good for it...

You will need a wideband, Get the AEM UEGO

 

^Yea i really dont have the cash but i think i may have too....

Is there anyone running a similar set up? S/C w/ header and nst 9.5 pulley?

 

^ alot of people are running that setup... you need to look in the S/C threads...

 

I hate to state the painfully obvious but the A/F should be very high on your list if you're running forced induction and concerned. Think about if it was running lean and sometime down the road you had to replace the motor would you have the money for that?

 

But on the other hand I seriously doubt freeing up your exhaust a bit is going to make you run dangerously lean.

 

^word, im gettin the a/f gauge i have put in soon and then when i can free up some cash ill swap it out for the wideband

 

Just sayin because I went that blown motor route lol I'm built now but it's not a fun unexpected road. thank god for graduation money, credit cards, and savings accounts...

 

so you have money for a new pully, but no money for a good gauge? thats dumb.

 

I got the new pulley and belt for more than half off smart a$$ . And i won't be putting it in until i purchase the gauge

 

So you would rather have a " buy now, ask questions and help later " attitide?

 

No, I purchased the pulley with the idea that it would be run safely because there are several people running the same set up. However, a friend of mine pointed out that I might be running a little lean so i decided to search around before i did something i regreted. If your not going to be helpfull please stop posting.

 

Oh well wideband ordered, got it for 240 shipped. I'll post up if and how much the MMW set up is making me run lean.