gbal4

Hey guys I am thinking about swapping my cam out on my SS but I would like to know what kind of gas mileage can I expect after this has been done. On my trip from out of town I got excellent gas mileage from my 2 1/2 hour trip I am aware that the added horsepower will decrease my mileage but by how much?? any way thanks for the input!!

sroach20

iTrader: (31)

a4 or m6?

teke184

iTrader: (5)

233/233 cam
bolt ons
m6 trans
stock 10bolt with 3.42 gears

75-80mph with the windows down and ttops off (reduces mileage by about 1mpg) i consistently knock down 24-25mpg

sroach20

iTrader: (31)

with an m6 you will not loose much because of sixth gear. there are people that have larger cams getting excellent mileage.

Randy WS6

iTrader: (69)

But always remember, that good performance takes fuel & air.

greatskiiiier

iTrader: (10)

i lost around 4mpg on the HWY with my 4.11s

i would venture to say gear change= cam swap in terms of gas mileage loss

gbal4

sorry it is a M6

Turo

iTrader: (23)

On my car (94k miles), 01 Z28 M6 with all bolt ons and a 230/232 FMS F13 cam I get ~24-25 mpg highway and 14-16 mpg city. I don't remember what my mileage was before the cam, but I know my car has lost about 2-3 mpg since it was stock (some of that may be the mods, and some may be its age/mileage).

sroach20

iTrader: (31)

what about a heavier foot since it goes faster?

Vols Fan

iTrader: (7)

I have a G5X3 cam in my Z06, and with a very rich condition in the low RPM's, I was able to get 27mpg's on my 450 miles trip from upstate SC to western Tennessee.

TORCHD 02 TA

iTrader: (39)

In my M6 TA, i have a 228/232 cam... If i drive conservatevly city i get anywhere from 14-16. Highway in 6th gear i still got 26...

Hope this helps

01ssreda4

iTrader: (96)

i used to get as much as 25 mixed driving w A4 and LTs. now with a stall gears and cam i could imagine i have cut that down by at least 5-10. i think a lot has to do with how you drive it.

blown03mustang

im running the torquer 2 (232 234), 4:11s and heavy 17s but getting about 21-22 mpg on the highway and about 16-17 in the city b/c theres a friggin stoplight every 1/32nd of a mile...lol but gas mileage really didnt change much after the cam swap

Nitroused383

iTrader: (10)

11:1 compression, custom cam, M6, stock 3.42's, 243 heads 28 mpg highway at 70mph (better than stock 25ish). Seemed like mileage improved with the new flow matched injectors, also idles smoother. I do my own tuning with hptuners and a wideband (olsd), I can probably get 29-30mpg out of it as I just got it running 3 weeks ago. Averaging 18mpg city/highway while running it through the gears atleast 10 times and a 0-150 run.

gbal4

thanks guys for the info!!!!

TORCHD 02 TA

iTrader: (39)

How did you get 11:1 Compression Ratio? What is stock again?

Nitroused383

iTrader: (10)

Stock compression is 10.2:1. I milled a set of 243 heads (stock 64.5 cc's) to 62 cc's and used GM MLS gasket .052". Stock 241 and 853 heads are 67cc's.

kidcamaro98

iTrader: (8)

I got about 300mpg's to a full tank with just intake/headers and exhaust with my M6 with 3.42's...

now after my MS3 went in and dyno tuned with 41lb injectors, I get about 240mpg's to a full tank...it doesnt help having the 3.42's driving around 2-2300k opposed to before my cam I was around 1500rpms in cruising speeds.

TORCHD 02 TA

iTrader: (39)

I want to get my DCR upto 8.5>8.7.. Right now i am at 8.2

I was planning on going ported LS6 heads with a .040" head gasket.

By changing JUST THE cam, you do no change static compression do you? You change compression when you change the heads or head gaskets right?

Nitroused383

iTrader: (10)

Static compression ratio is physical compression ratio determined by piston (dome, flat, dish) deck height, gasket thickness, and cylinder head volume. (Total volume + cylinder head volume) / cylinder head volume = static compression ratio. Dynamic compression is determined by your intake valve closing point from your cam timing events. DCR is not a set and stone thing just kind of a handy tool to play with. Just shoot for around 11:1 static compression and you will be fine. I am right at 9:1 DCR and people say thats not possible on pump gas (92 octane here). I have no issues even with 27 degrees of timing at wot.

BTW its cheaper to get your heads milled for $50 and buy a set of $28 (Scoggin Dickey) GM MLS .052" than it is to buy those exspensive cometic gaskets.