: Camshafts vs. Gas Mileage



8's on a drag radial
03-05-09, 08:57 AM
I know this seems like a strange question, but my V is a DD and I average about 600 miles a week. I figured at 100K I would take the heads off and lightly port them, have a valve job done and put on an upgraded spring. At the same time add a camshaft and some longtubes.

Anyone have data regarding gas mileage after switching to a larger cam?

This is a LS6 by the way and I'm averaging about 20mpg at the moment.

NormV
03-05-09, 09:10 AM
You should really fork over a few bucks for a tune now. It will pay part of your fuel bill. I could see 26-27 mpg for my 500 per week. 30 mpg for 8 hour haul to eastern PA two up with luggage. These are all speed limit driving with tire pressure just under 40psi. So consider it optimal. . Daily commute with temps averaging 15F degrees were 23 mpg due to tempature. Adding procharger and 3.42 diff I am still getting 23mpg.


Norm

CadiBlk
03-05-09, 11:04 AM
I would like to see those mpgs.

945liter
03-05-09, 11:06 AM
You should really fork over a few bucks for a tune now. It will pay part of your fuel bill. I could see 26-27 mpg for my 500 per week. 30 mpg for 8 hour haul to eastern PA two up with luggage. These are all speed limit driving with tire pressure just under 40psi. So consider it optimal. . Daily commute with temps averaging 15F degrees were 23 mpg due to tempature. Adding procharger and 3.42 diff I am still getting 23mpg.


Norm

That gas mileage drop is not worth it sell me your procharger :yup:

trukk
03-05-09, 03:07 PM
When I added my cam my gas milleage increased by about 4mpg. I used to average aroun 13, not I average around 17. Obviously I have a big brick tied to my right foot.

When driving on a flat road, with AC off, windows up at about 70 mph w/ cruise on, I can get over 30mpg. I rarely ever do that, but it is possible.

I was VERY surprised with this, but happy. A lot of it has to do with getting a good (but safe) tune.

-Chris

surfera007
03-05-09, 07:24 PM
Damn! Better mileage? I was always told a cam will kill my mileage. I am sooo on the border of getting one but just can't seem to push myself for the cost

shadybx7
03-05-09, 07:32 PM
Are these the specs on the stock LS6 cam.?. 218 intake and 204 exhaust..

trukk
03-06-09, 10:04 AM
Damn! Better mileage? I was always told a cam will kill my mileage. I am sooo on the border of getting one but just can't seem to push myself for the cost


I was surprised as well. I think a lot of it has to do with the tune. Get that AFR into the high 12's, enought to be safe, but not to be dumping too much fuel.

Let's be real though, the bigest contributer to good MPG is the nut behind the wheel. I could get really good millegae now, but I still only average 17-18, because of the way I drive (my 6th gear is rusty ;) )

-Chris

8's on a drag radial
03-06-09, 10:40 AM
When I added my cam my gas milleage increased by about 4mpg. I used to average aroun 13, not I average around 17. Obviously I have a big brick tied to my right foot.

When driving on a flat road, with AC off, windows up at about 70 mph w/ cruise on, I can get over 30mpg. I rarely ever do that, but it is possible.

I was VERY surprised with this, but happy. A lot of it has to do with getting a good (but safe) tune.

-Chris

Thanks for the great data Chris. What camshaft do you have and by chance do you have any videos of it idling?

trukk
03-06-09, 11:52 AM
Thanks for the great data Chris. What camshaft do you have and by chance do you have any videos of it idling?

The (beyond) gory details:

http://www.cadillacforums.com/forums/cadillac-cts-v-series-forum-2004/139034-cam-results-57-rwhp-45-rwtq.html

It has an idle clip further along in the thread.

Cam specs are in my sig.

-Chris

chadeberly
03-06-09, 11:58 AM
I have noticed a difference from stock about 24 mpg on hwy.

heres my vid...bottom of thread>>

http://www.cadillacforums.com/forums/cadillac-cts-v-series-forum-2004/163301-got-my-car-back-performance-shop-2.html#post1797796

Naf
03-08-09, 01:33 AM
Cams dont really effect the milage drasticly...If you have left everything else the same, you may see better milage due to better efficeincy. Duration is your friend more then lift...

If you go for Cam and head swap its a shot in the dark...

I really dont have to car about my milage, Though my Tahoe gets 20+mpg @ 80mph, gas is cheaper then water...

thebigjimsho
03-08-09, 01:36 AM
My mileage improved by about 1 mpg after my headers and tune.

n2ojunky
03-08-09, 05:09 AM
I have a pretty radical cam and build and still get 27/28 in 6th on the highway at 70-75 here how she sounds at idle


http://www.youtube.com/watch?v=XYxSERenXyU

thebigjimsho
03-08-09, 11:44 AM
is that THE Caddy?

liqidvenom
03-08-09, 12:16 PM
You guys must have a good highway commute to work. I avg about 15.8 or so, but with jersey traffic and a short highway commute i'm not sure how much better it could be. I do get heavy on the throttle for the two on ramps i hit.

N20junky- do you ever get crap from your local pd? your car sounds great but im wondering how you can dd that and not get pulled everyday. And whats you cam specs/mod list/power level if you dont mind saying.

Bueller
03-08-09, 12:21 PM
THE caddy is not a sleeper anymore. Holy Nascar batman. Do you have open headers? Sounds killer.

JonCR96Z
03-08-09, 12:24 PM
is that THE Caddy?
That Caddy goes 0-60 in 0 seconds.

thebigjimsho
03-08-09, 12:42 PM
That Caddy goes 0-60 in 0 seconds.
amazing!

JonCR96Z
03-09-09, 01:07 AM
stupendous!

BlackBoosted2
03-09-09, 10:11 AM
I haven't put a cam in my V yet, but in my C5 I only lost about 1-2mpg post cam swap (232/238 595/605 112); and that was after a full set of bolt-ons as well. It now gets about 25-28mpg highway depending on speed (75-80mph). I had seen 31mpg's stock out of that car going 70mph once. However, it's hard to only drive 70 ...ha

The V will get a baby cam soon enough

trukk
03-09-09, 12:11 PM
That Caddy goes 0-60 in 0 seconds.


LOL...Dean we invoke you....he is sure to appear.

-Chris

thebigjimsho
03-09-09, 09:33 PM
Dean vs musclesbmf would be fun...