I can either install my 4.10's I have waiting around, or I can get an sct xcal. What you think? I run 93 octane.

Also, if I install gears, does my redline go down? Right now its like 5200 or so when I shift going ***** to the wall. Will it drop down? My buddy at work said itll go down to like 4400 or so, is this true? If it is, does that mean my mustang will generate its power at lower rpms?

Most of my driving is normal driving, but sometimes I like to floor it at stoplgihts and such.

 

Is your car manual or automatic? Also from what ive heard, your RPM going around 70 will actually go up a bit. Also what all do you have done to your car? If its just pure stock then the sct xcal wont do as much as if you had some other bolt ons. Most people say though that the biggest difference theyve done to their cars are gear ratio change.

 

Its a manual. All I have done to the car is a CAI and I am putting on an o/r H in a few days. I understand that in 5th gear I will lose tons of MPG, but I am talking about my redline.

 

1. Stop listening to idiots, especially your buddy. He was talking out his *** and doesn't know a ******* thing. Tell him I said so.

2. You need the X-cal to adjust the ECU for the gears. The gears will cause you to use your RPM window more effectively via torque multiplication. The X-cal is a good idea anyway. Look at the LiveLink or Xcal3.

3. Redline is defined by valve train setup and bottom end build, not by gears. Your redline is 5800rpm and will always be that way.

4. Your gas mileage will not change much if at all. You might even gain a little mileage. Your tire life will probably suffer but that's a tendency not a rule (related to spinning them).

5. Your RPM at any speed will go up but the amount of throttle you give to get there will drop.

Get your Xcal, then get the gears installed. Stop using 93 octane unless your tune REQUIRES it. If you're running the stock tune the use 87 octane and quit spending your ******* retirement on gas.

Now, you've gotten the right advice, quit looking and go do it.

 

lol

 

lol.. 93 is what, 20 cents more than 87? If you buy gas 5 gallons at a time like me, then you're only spending $1.00 more per fill up

 

Cool... would you go ahead and send me a dollar via paypal EVERY SINGLE DAY? Since it's just a dollar, and you don't want them.

And typically it's 30-35cents more per gallon and it's not the cost, you LOSE POWER with higher octane.

 

SOMEONE woke up on the wrong side of the bed this morning...

 

Redneck is just trying to help. I'd listen to what he has to say... he knows what he is talking about.

The only thing I don't understand is why you need a tuner to adjust the ECU for the gear change. You're making a modification all the way down the driveline away from where the power is produced so I don't see how a tune would help that, but perhaps I'm wrong. 98' and previous cars need a speed calibration though, correct?

 

so, 91 octane is also a no go?

thx for the advice redneck, i appreciate it.

 

Unless you have a tune other than what came from the factory stock, no. The car was tuned by Ford to run optimally on 87 octane. Running 91 or 93 will give no added performance at all seeing that the engine is not programmed to take advantage of the added potential. It's just a waste of money.

 

D: I feel sad now..i bought 93 octane for about 35cents more normally i run 90 octane though, but if you go even 90 its no better than 87?

 

90 Octane won't be any better than 87. I thought a while ago that this is the case, just like you, but it is not. Quoted from an article I found on the Web,

Higher octane fuels are used in engines that are designed and/or tuned for the fuel or in engines that knock, as a higher octane fuel will dismiss engine knocking. And no, "premium" fuel will not give you any added gas mileage. If you got a 91 or 93 octane tune, you could sure pick up some added power running higher octane fuel.

 

Thanks, from now on im buyin 90 octane at most, definatly not walmart gas, that makes my engine ping

 

I'm a firm believer in quality of gas, however. This is getting way off-topic, but I'd still like to address the fact. While I haven't seen any hard proof, I've always used name-brand gasoline such as Chevron, Exxon, Sunoco as opposed to local mom-and-pop gas stations that sell generic gasoline cheaper than anywhere around. I believe the quality of the name-brand product is much better than the cheap stuff, but that's just me.

Back on topic...

 

so im going to get a tuner before the gears so when i do the gears i can fix the speedo issue.

Last thing. Right now there is no point in running anything over 87 octane, But once I get the tuner would running a higher octane tune give me more power?

 

Yea I think someone put "yellow milk" in R3d's corn flakes.

 

If you got a specific tune for 91 or 93 octane fuel, yes.

 

ok thx, thats why i was running 93, was gonna tune my car for it for more power. Will a tune for 93 give more power then a tune for 91?

 

Minimally, but yes.

 

Redneck is right...you will have a major carbon build up on your valves if you do not tune your car to run with 93 octane. What this means if your supposed to run on 87 and you put in 93 your car is not tuned to burn up the extra octane.

Also do not use any other octane that is just another way of gas stations earning extra money...you either use 87 or 93, there is no in between and my other opinion is always use Sunoco. I've never had a problem with ping using their gas.

 

never heard of sunoco, normally i use shell.

 

Because 99-04 models have electric spedo's.
94-98 models have that little plastic piece like you said.

 

Not cranky today, I hate watching people do stupid things for BS reasons. The OP has decided to take some good advice and that's all that's important.

In 99+ cars you can only fix the speedo with a change to the ECU, it "knows" that you have a certain size gear set from the factory so you have to tell it that you've changed it after you do so. It doesn't actually change the engine tune but does change the way the ECU displays data. Everything on sensor driven cars is based on voltage from a sensor so the ECU doesn't know **** in any empirical way. If you dont' tinker with the settings for things that you change you could experience all sorts of problems. With gears your mileage will climb super fast and you could throw a ABS TCS or CEL light.

As for brands of gas, I buy from American owned and operated chains.
Sunoco
Conoco
Sinclair
BP / Phillips (last choice, actually British but part US owned)
Hess.
ARCO
Maverick
Flying J.
Valero

I don't buy from Valero because they are actually CITGO which is Venezuelan and ALL profits go to support Hugo Chavez's despotic regime. If an OPECker like Chooey Chavez wants my money he'll have to suck my public relations dick like all the other brown-skins with no national resource but oil. And when their oil is gone, good riddance. Their **** ant country can go back to a fourth world ****** backwater where old ugly white guys go to screw a 12yo boy.

BTW, Venezuela has the WORST oil in the world. It's called heavy crude and has to be refined in Venezuela before refiners will even touch it.

Want more info on Chavez-e-Chavez: http://www.telegraph.co.uk/news/worl...go-Chavez.html

 

Just a fyi for anyone NEVER buy walmart gas unless you absolutley have no choice. The 87 octane from them makes me engine ping, but any other company around here doesnt. And sadly enough my dirtbike bogs out on their 87 but again any other company doesnt.

 

never seen those brands u named redneck, cept bp, which is only like 4 minutes away. Guess ill go there.

 

Same here.

The most common gas station in the panhandle and beyond is Tom Thumb, which uses citgo, and usually has the best gas prices. Ive never heard of anything on that list except for bp.

and I dont really care where it comes from, honestly.

 

Well.. When I still had a car I only drove it about 15 miles a week, and even when beating on it hard I was still able to get 15mpg. So you can probably guess how often I bought gas, even at 5 gallons per fill up. I could have gone even longer if I would have filled it up all the way (which was around 20 gallons or so,) but that's a lot of dead weight to be hauling around. As far as using the higher octane gas, I guess that was just personal preference. But it seemed to me that my high compression Audi engine didn't like the 87, or even 89 octane gas very much, as there was a noticeable loss in power and engine response. This I would assume was due to the ECU messing around with the timing of the engine to compensate for the crappy gas. It also seemed as though my average mileage dropped, though I could be wrong.

 

If you ever go out West at all, you'll see a TON of Sinclair stations, and a lot of them still have those little green dinosaur statues out front. Another one I saw quite a few times was Road Ranger, though I never actually bought gas there. My favorite by far (and actually relatively common) was a gas station called "Kum and Go" I LOLed every time I saw one of those . I don't recall seeing any Sunocos out there, but I did see some Conocos.

 

my cobra says premium fuel only, doesnt that mean run somethin better than standard or is that just a suggestion