Gannet

Did a search but of course not too many posts about improving mileage.

I think it should be possible to build an LS1 that will make considerably more power and get better mileage than stock. Start with an '02 Corvette MM6 (like mine f'rinstance) and add the following:

AFR 205s milled to 64cc with Cometic .040 gaskets, SCR of about 11:1
American Racing 1 3/4" longtubes & high-flow cats
FAST 90/90
Underdrive pulley

Each of these items should either improve mileage or at least not harm it any, and between them should be worth 50-60 rwhp.

So now let's add a cam, with the design goal that it make good power and make at least as much mileage, if not more, than the stock cam with these parts. The cam also needs to have a very wide powerband, capable of running well at 1200 rpm in 6th, and also making good power to at least 6000. It also has to give good valve spring life.

I'm thinking something like a 220/220 XE-R on a 116+4. -12 degrees overlap at .050 should make good vacuum and mileage. IVC of 42 degrees at .050 should keep it making power well over 6000. DCR with above heads comes out at 8.65:1.

If anything, I'm thinking it might be better to go even shorter on the intake, say 214-216. The Crane 1.8 "fast rate" rockers w/guide plates on XE low-lift lobes seem like another good possibility.

I think this car could make well over 400 rwhp, run 11s, and get better than 30 mpg, maybe 35, at 75 mph.

Any other ideas on camming for these goals?

brad8266

iTrader: (23)

Mods hurt gas mileage, period. The more air through an engine the more fuel it needs, thats prett basic combustion. Now just upping compression will help out by making the engine more efficient without affecting airflow, but any airflow mod will have some affect on mileage.

I dont think you will ever keep stock mileage with a cam, unless its like lingenfelter cam.

MeentSS02

iTrader: (11)

Oooooooooo oooooooooo...pick me! Pick me! I have a suggestion:

Nitrous. Do all the stuff above, leave the cam stock or go with something like a Lingenfelter GT2-3.

NEVR2ND

iTrader: (10)

Try the Thunder Racing CheaTR cam. I run it in my car and love it. Just .1 sec slower than when I was running the F13 cam. Drivability 110% better.

68birdls1

iTrader: (46)

you cant have your performance and mileage like you are thinking and wanting bud. you gotta give to recieve

dyls1

iTrader: (11)

10's with a cheaTR cam?? On spray or a diff car or setup??

smokeum99ta

iTrader: (15)

A couple years ago when I was using a G5x2 cam I did several long trips (5-7 hours) and was getting around 25 mpg. but that all changed as soon as I got off the highway and did some city style driving. Not sure on your driving habits but it seemed to get good mileage to me.

NEVR2ND

iTrader: (10)

10.8@125 on 150 shot with the CheaTR and Patriot S2 5.3 heads

Widetracker

What about the 02 LS6 cam? I have similar aims and plan to swap one in my 99.

Gannet

Well clearly, a Z06 cam makes enough power to get a near-stock Z06 into the 11s, and I believe they get about the same mileage as an LS1 Vette. I was actually using the Z06 cam spec as my "benchmark" and just looking to see where that might be improved on slightly. Maybe the Z06 is as far as you can go without losing mileage. I don't know, hence the question.

SSNISTR

iTrader: (10)

Gotta agree there, and more mods makes for a heavier foot lol.

dug

iTrader: (10)

There wasnt any change in milage after cam and headers in sig.

BlackScreaminMachine

iTrader: (17)

Alot of driveabilty, fuel milage, and hp/et will be found in the tuning of the car, adjusting the PE/VE tables.