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Old 11-07-2013, 04:09 PM   #1
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Couple quick ones...

So having had my 07 manual v6 for almost a year now, I've had some time to mull over some questions and do my own research.

When I bought the car from the dealership nobody said anything to me about what gas to use, so for the last year I've been filling her with 87. It is evident that the previous owner may have done some modding, and I have no idea what s/he may or may not have done. The dual exhaust (straight pipes, no H or X pipe...) appears to be 3" pipes, which seems to be consistent with a little lethargy in the low end and more pep up top.

Could this also be a symptom of a tune that should be running 91/93 and I'm unknowingly running it on the wrong grade of gas?

Also, what are the implications of just running her on 93 anyways? I'm about down to empty and am contemplating filling her up with 93 and just running that from now on... (It's just as easy as that right? I found a bunch of threads talking about switching to 93 for a tune, but I don't need to worry about running her that dry if I'm not gonna tune it, right?) A CAI/tune will happen, I just don't see it happening for another few months at the very least.

Thanks for the help guys.
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Old 11-07-2013, 05:20 PM   #2
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Originally Posted by Scoobuh View Post
So having had my 07 manual v6 for almost a year now, I've had some time to mull over some questions and do my own research. When I bought the car from the dealership nobody said anything to me about what gas to use, so for the last year I've been filling her with 87. It is evident that the previous owner may have done some modding, and I have no idea what s/he may or may not have done. The dual exhaust (straight pipes, no H or X pipe...) appears to be 3" pipes, which seems to be consistent with a little lethargy in the low end and more pep up top. Could this also be a symptom of a tune that should be running 91/93 and I'm unknowingly running it on the wrong grade of gas? Also, what are the implications of just running her on 93 anyways? I'm about down to empty and am contemplating filling her up with 93 and just running that from now on... (It's just as easy as that right? I found a bunch of threads talking about switching to 93 for a tune, but I don't need to worry about running her that dry if I'm not gonna tune it, right?) A CAI/tune will happen, I just don't see it happening for another few months at the very least. Thanks for the help guys.
Well, i don't think it'd really hurt anything. If it was a 93 race tune, and you put 87 in it, you'd know. But, personally i'd fill her up with Mid grade if gas prices rise back up again. But, since they took a nice drop. Go ahead and put 93 in there. Nothing bad will come of it. Also, does the car have catalytic converters on it? If not, and there is no CEL popping up, chances are it's got a tune. That's just one quick easy way to tell, since you said it's got straight pipes.
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Old 11-07-2013, 07:01 PM   #3
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If you are running 87 and it is tuned for a higher grade of gas it will ping like crazy. And honestly 3" pipes are not good for the 4.0, unless it has major modifications done to it the stock 2.25" pipes do just fine, other wise you are loosing too much bottom end to make up for the top end gain. Since it is just straight pipes without an x or h that means the previous owner put in divorced duals, which is common with these cars because of the even firing order, they don't need the h or x to balance the gas pressures in the exhaust.

If you do change to a higher octane gas on a stock tune it won't do anything, yea its slightly better gas but performance wise it won't do a thing unless you are tuned for it. But if you tune it for a higher octane gas (such as 93) you will absolutely have to run that minimum octane.
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Old 11-07-2013, 09:27 PM   #4
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If you are running 87 and it is tuned for a higher grade of gas it will ping like crazy. And honestly 3" pipes are not good for the 4.0, unless it has major modifications done to it the stock 2.25" pipes do just fine, other wise you are loosing too much bottom end to make up for the top end gain. Since it is just straight pipes without an x or h that means the previous owner put in divorced duals, which is common with these cars because of the even firing order, they don't need the h or x to balance the gas pressures in the exhaust. If you do change to a higher octane gas on a stock tune it won't do anything, yea its slightly better gas but performance wise it won't do a thing unless you are tuned for it. But if you tune it for a higher octane gas (such as 93) you will absolutely have to run that minimum octane.
Stock is 2.5" piping
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Old 11-07-2013, 09:56 PM   #5
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Stock is 2.5" piping
Coulda sworn it was 2.25, guess I was wrong. Either way 3" is too big even for the 4.6 unless boosted
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Old 11-08-2013, 07:25 AM   #6
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Coulda sworn it was 2.25, guess I was wrong. Either way 3" is too big even for the 4.6 unless boosted
Oh yeah definitely too big...I honestly wouldn't even want full 3" on a 5.0 unless boosted. It just kills torque
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Old 11-08-2013, 07:57 AM   #7
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Look up 3" cobra exhaust it's comp orange. It's badass. On YouTube.
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Old 11-08-2013, 08:41 AM   #8
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Look up 3" cobra exhaust it's comp orange. It's badass. On YouTube.
Oh I know it sounds incredible but as far as balanced power
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Old 11-08-2013, 08:46 AM   #9
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Yeah it's got power
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Old 11-08-2013, 10:23 AM   #10
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Yeah it's got power
I'm sure it does but lost a good bit of low end torque compared to using a 2.5"
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Old 11-08-2013, 12:54 PM   #11
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Like I said, it appears to be 3", I haven't actually measured it, I'll get under there later today or tomorrow and check... Maybe its 2.75" ? It's consistent with the symptoms of having too large of a tailpipe, and I don't have the finances to change it. It sounds awesome, so thats a plus. Either way, I filled her up with 92 last night, it cost me all of 2 bucks more than had I used 87, so even if there's little to no gain, I'll stick with it out of habit and then when I do get the tune, I'll already be on 93.

---------- Post added at 10:54 AM ---------- Previous post was at 10:54 AM ----------

Thanks for all the answers guys.
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