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Camaro V6 LLT Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 12-30-2010, 11:32 AM   #1
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Ok so last night..

me and a buddy were coming up I-95 north. I just installed my CAI a few days ago and this was my first highway trip, so i reset the average mpg. After 129 miles at 71 mph i look and it says 23.2!! Anyone got any idea what would make it so low? car is stock rather than the CAI.
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Old 12-30-2010, 12:25 PM   #2
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hrm...not really sure!

What is the mileage on your car? Maybe needs more breaking in?? Just a thought.

I'd think you should have gotten around 27 or more MPGs, especially if the CAI was working properly. Maybe that is the problem....maybe the air/fuel ratio is off a bit because of the CAI. But most CAIs out there seem to perform pretty well now, so I wouldn't expect that either.

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Old 12-30-2010, 01:02 PM   #3
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It is an injen and ive got 3000 miles on the car....I wish I had something to compare to from when I had a stock Intake...maybe I did something wrong on the install?
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Old 12-30-2010, 01:06 PM   #4
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yeah, it's hard to gauge with no stock numbers to compare to. slap your stock intake back on and see what you get then. It does seem really low. That's about what i get driving in the city. lol
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Old 12-30-2010, 01:08 PM   #5
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double check the PCV hose at the back of the valve cover on the driver's side... make sure you didn't pull it out when you installed...
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Old 12-30-2010, 01:26 PM   #6
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Quote:
Originally Posted by scrming View Post
double check the PCV hose at the back of the valve cover on the driver's side... make sure you didn't pull it out when you installed...

I'm not completely sure which hose that is, but i checked all the hoses i could see on the driver's side and they all seemed to be tight. Although i noticed that when i got my injen, there was only one bolt included to put the MAF on the intake tube. i have the one tightened and i can't move it around the other side, but i'm thinking this is the problem maybe?
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Old 12-30-2010, 01:52 PM   #7
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How cold was it outside and make sure you put the MAF back in facing the right direction?
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Old 12-30-2010, 02:04 PM   #8
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Also be careful always trusting the trip computer. These are not always accurate, before I make mods I try and hand calculate mpg before and after.

I would also recommend putting on a couple more miles before I worry to much. Drive your normal routes for a couple hundred miles and see what it is telling you.
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Old 12-30-2010, 02:09 PM   #9
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I hardly get over 23 or 24 on a stock intake. Nothing bad about 23.

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Old 12-30-2010, 02:11 PM   #10
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lead foot syndrome, perhaps..
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Old 12-30-2010, 02:14 PM   #11
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Originally Posted by devildoc View Post
How cold was it outside and make sure you put the MAF back in facing the right direction?

The MAF is facing the right direction and the temp was around 44. and i dont have a lead foot at all i hardly ever stab it.
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Old 12-30-2010, 02:15 PM   #12
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I hardly get over 23 or 24 on a stock intake. Nothing bad about 23.

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yes, but that is on a 6.2 liter, correct? I drive my v6 like a baby and am pretty suprised its getting 23 at 71mph constantly...
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Old 12-30-2010, 02:29 PM   #13
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In this weather at 70 mph that MPG sounds normal. In the summer I've gotten up to 38 mpg on flat ground at 55 mph with cruise on so I know my car is running right.

A few weeks ago I did a 170 mile trek at 70 mph and got 24 mpg so yours sounds right.
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Old 12-30-2010, 02:36 PM   #14
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In this weather at 70 mph that MPG sounds normal. In the summer I've gotten up to 38 mpg on flat ground at 55 mph with cruise on so I know my car is running right.

A few weeks ago I did a 170 mile trek at 70 mph and got 24 mpg so yours sounds right.

I didn't know that was normal!! i figured it would be hurt in the winter but geez...you were on cruise the whole time with no stops and all? If this is normal so be it, but i'm hoping the missing hex bolt on the intake may have something to do with it....
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Old 12-30-2010, 02:45 PM   #15
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Quote:
Originally Posted by squatin0n18s View Post
yes, but that is on a 6.2 liter, correct? I drive my v6 like a baby and am pretty suprised its getting 23 at 71mph constantly...
Duh my bad dude. I didn't see you had a V6.

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Old 12-30-2010, 02:58 PM   #16
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It doesn't seem too bad for hauling 1.7 tons at 71mph. Most of the best economy figures posted by car companies, are carried out at between 55, and 60mph.
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Old 12-30-2010, 03:19 PM   #17
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Ok, are most people getting around this on the highway at this time of year? Anyone who watches their mpg please chime in. Also, does anyone think the missing hex bolt on the MAF could be the problem?

Last edited by squatin0n18s; 12-30-2010 at 03:32 PM.
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Old 12-30-2010, 03:29 PM   #18
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Quote:
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Duh my bad dude. I didn't see you had a V6.

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we are in the v6 section. lol
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Old 12-30-2010, 04:02 PM   #19
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Quote:
Originally Posted by hamr56 View Post
Also be careful always trusting the trip computer. These are not always accurate, before I make mods I try and hand calculate mpg before and after.

I would also recommend putting on a couple more miles before I worry to much. Drive your normal routes for a couple hundred miles and see what it is telling you.
I don't find that to be the case at all. I check my mileage on every fill up and the computer has been accurate within a couple tenths every time.

As for more break-in time, not necessarily true. I was getting over 29 mpg when testing on the highway. I had only 1000 miles at the time. (side note: I also had the MRT 2.0's installed at this time too.)

Quote:
Originally Posted by DarkneSS View Post
In this weather at 70 mph that MPG sounds normal. In the summer I've gotten up to 38 mpg on flat ground at 55 mph with cruise on so I know my car is running right.

A few weeks ago I did a 170 mile trek at 70 mph and got 24 mpg so yours sounds right.
I was running in 37 degree weather back in April when doing my tests at 70 mph and was getting over 29 mph.

Quote:
Originally Posted by squatin0n18s View Post
I didn't know that was normal!! i figured it would be hurt in the winter but geez...you were on cruise the whole time with no stops and all? If this is normal so be it, but I'm hoping the missing hex bolt on the intake may have something to do with it....
Quote:
Originally Posted by stray bullitt View Post
It doesn't seem too bad for hauling 1.7 tons at 71mph. Most of the best economy figures posted by car companies, are carried out at between 55, and 60mph.
I don't agree. I have seen over 29 mpg on a 322 mile round trip (mostly highway) at 70 mph cruise set. And this included some spirited driving when I got to my destination at the half way point while showing my Camaro to my brother in-laws.

Quote:
Originally Posted by squatin0n18s View Post
Ok, are most people getting around this on the highway at this time of year? Anyone who watches their mpg please chime in. Also, does anyone think the missing hex bolt on the MAF could be the problem?
I have averaged 24.3 mpg for my 13,600 miles of owning my Camaro. I have seen as high as 33.3 while doing my 25 mile highway test with the cruise set at 65 mph in 46 degree weather.
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Old 12-30-2010, 04:24 PM   #20
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Originally Posted by rtcat600man View Post
I don't find that to be the case at all. I check my mileage on every fill up and the computer has been accurate within a couple tenths every time.

As for more break-in time, not necessarily true. I was getting over 29 mpg when testing on the highway. I had only 1000 miles at the time. (side note: I also had the MRT 2.0's installed at this time too.)



I was running in 37 degree weather back in April when doing my tests at 70 mph and was getting over 29 mph.





I don't agree. I have seen over 29 mpg on a 322 mile round trip (mostly highway) at 70 mph cruise set. And this included some spirited driving when I got to my destination at the half way point while showing my Camaro to my brother in-laws.



I have averaged 24.3 mpg for my 13,600 miles of owning my Camaro. I have seen as high as 33.3 while doing my 25 mile highway test with the cruise set at 65 mph in 46 degree weather.
I don't think its right either, when i got the car i remember seeing 29mpg going on a short trip to another town, it was about 25 miles at 65mph...I just need to figure out what the problem is.
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Old 12-30-2010, 04:47 PM   #21
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I know scrmings recommendation on the PCV hose helped a couple other members out who had the same issue, but you said you thought yours was on snug...might be worth another look.

Good luck! Hopefully you won't have to resort back to putting the stocker on just to see if it makes a difference.
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Old 12-30-2010, 04:58 PM   #22
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I know scrmings recommendation on the PCV hose helped a couple other members out who had the same issue, but you said you thought yours was on snug...might be worth another look.

Good luck! Hopefully you won't have to resort back to putting the stocker on just to see if it makes a difference.

is that the hose from the injen? like the one that the oil diffuser was connected to when they were still shipping them?
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Old 12-30-2010, 05:03 PM   #23
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At sea level with low temps and high baro you make the most power but, you also use the most fuel. I did a trip on I95 Christmas day in 40 degree weather averaging 75 and got 22.7 with my Airaid V2 and MRT V1 setup. Of course, it was running like a raped ape that day! DA was -765!
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Old 12-30-2010, 05:31 PM   #24
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is that the hose from the injen? like the one that the oil diffuser was connected to when they were still shipping them?

Yes, trace that line back to where it is connected to the engine and make sure it is connected well.
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Old 12-30-2010, 05:56 PM   #25
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Yes, trace that line back to where it is connected to the engine and make sure it is connected well.
Dang, yep mine's snug...was hoping that could be it maybe.
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