05rex8

iTrader: (7)

go buy a prius

RIWWP

iTrader: (2)

I just filled up 14.1 gallons, 9 days and 285 miles since last fillup. 70% highway, alot of time spent in 4th and 5th gear instead of 6, WOT often, lots of warm-up idel time, etc... I can ***** foot the throttle for 24mpg+, but that's no fun.


I guess I am convinced that this is what the Renesis is capable of, and anyone that doesn't get this mileage has something wrong , or at a bare minimum, isn't running at full healthy.

Stock NA (well, loaned midpipe atm, new cat goes in tomorrow), 93 octane, aggressive throttle usage, Lucas UCL as a light premix, Castrol 10w40, fuel trims and e-shaft sensor reset often... ~24 seconds 0 - 120mph. I can accelerate smoothly without concern in 6th gear from as low as 33mph (32 starts bogging a bit).

I'm not sacrificing anything to get this mileage is what I am trying to say.

Shrug.

MTspeeds1

How would you know your cat went to crap, would you get a CEL? Is there any other way of knowing its ruined w/o taking it off and checking it

Razz1

Sorry, no way to tell. There is not a CEL

RIWWP

iTrader: (2)

There might be, there might not. Cats have several different ways they can fail. Some of those are quite noticable and apparent, some aren't.

If you are out driving, and pull over and look under your car, if you see the cat glowing red, it's definitely toast. Severe cases of this will also have smoke from melting / burning shielding and plastic nearby, this smoke can also appear to come from the engine bay, since smoke rises, and once it rises into the transmission tunnel, the only way to go up is forward into the engine bay, unless you have enough air flow to push it out the back. Your center console rearward of the shifter could also get very hot. Not just the ~85f degree temps that are normally there, but like 150+

If your car feels like it is choking to death, and the harder you push it, the worse it feels, the more power you lose, you might have a cat failure the same as mine that I posted on the previous page, where it was basically becoming a complete blockage of the cat, and the exhaust couldn't escape, and wasn't getting clear of the rotor housing, causing a mess of issues.

I did get misfires from my cat failure. AFTER my brand new coil replacement, plug replacement, air filter replacement, e-shaft sensor reset, and MAF cleaning. I suspect that this was because the oxygen content was so low that it had trouble firing correctly.

You can also remove your cat and take a look inside. There are 2 honeycombs, and you should only be able to see one, relatively close to the header side of the cat. The pic I posted shows the 2nd honeycomb, with the sensor tube just before it. The chunks are from the first honeycomb that fragmented. Rapping on your cat might also allow you to hear rattling of chunks, if this happened.

Cat failure symptoms share alot in common with coil failure, plug failure, and engine failure. Figuring out which one is the challenge, although coil failure can lead to plug failure which can lead to cat failure, which at the extreme, can lead to engine failure. So it's always possibly E) All of the above.

MTspeeds1

Thanks, this really helped a lot!

HomicidalApple

iTrader: (3)

Just have someone take a look at it, especially if you are still under the warranty then theirs nothing out of your pocket anyways.

But people are right, its winter bro, and its an 8... they arent easy on gas 18/24mpg is what they post and you probably drive it harder than what htey would. PLus its ****** cold in canada and its january! u gotta expect a little more fuel consumption when its this cold, your makin the engine work harder.

But as i said, it wouldnt hurt to get it looked at just to be safe.

Good luck

HaiDoGGRX-8

My mpg gone to crap fast I'm on pace to get 160 till light comes on use to get 220.... Changing coils and plugs tomorrow if that doesn't do it. Taking it in to the dealer get my warrantys worth.

deadphoenix52

or that some people would take the time to research the car they are going buy

ZumnRx8

^AMEN.... maybe he should buy a BUGGATI

HomicidalApple

iTrader: (3)

^nah just get a prius and youll never need to bitch about mpg again

ZumnRx8

ive gotten the same mileage +1