Kfxguy

iTrader: (1)

thanks. Ima see how it does with a bigger stall. Leave that cam. Don’t like it, I’ll swap it.

you joking but I did consider that a few times. Just can’t deal with how crappy a 6 sounds. But yea, that would be neat.


I’ll tell you guys this. I’m thinking maybe the 5.7 is a gas hog. I had a 99 Silverado extra cab 5.3 with a Texas speed 212/218 high lift and that heavy thing got 19-20mpg. With heavy *** 20” wheels and super heavy tires. My 2019 Silverado 5.3 gets really good mileage stock. I know it’s newer tech and direct injection. But still gets amazing mileage. Maybe this 5.3 will do better. I’m just getting stir crazy because it’s not done yet.

wannafbody

iTrader: (2)

I get about 17 mpg local with my cammed LS1. My 5.3 Silverado gets about 16-17 on the interstate.

Kfxguy

iTrader: (1)

my gto (heavier) averages 13-15 in town. 19-20 on the interstate. My Silverado averages around 18-22 in town. 24-25+ on interstate. Not broken in yet either. Haven’t had its first oil change.

wannafbody

iTrader: (2)

I've never gotten better than 17.5 on my 09 Silverado. I've gotten 19.5 on my Ecoboost F150 on a trip.

dreadpirateroberts

iTrader: (1)

I still think buying a C6ZR1 will go a long way towards making your inner speed junky content.

ddnspider

iTrader: (26)

Hes already been faster on a blow up pass not sorted than a stock C6 ZR1 except the unicorns on the fastest list....and he doesn't want a stick car.

bammax

The reason why different vehicles get different mileage is weight, aero and gearing. The Silverado has bad aero, but the weight is probably equal so my guess is that it's geared better for the driving you do. What gears are you running now?

dreadpirateroberts

iTrader: (1)

He traps 130+ and runs deep in the 10's?

dreadpirateroberts

iTrader: (1)

I only kid because he's on the other GTO forum and he's such a perfectionist.

NSFW

I have a hunch that your lope has more to do with the tune than the cam. My car (also 5.7L) has 9 degrees of overlap, vs -2.5 for your cam, and mine idles about the same. It might even be less lopey.

ddnspider

iTrader: (26)

Please reread my last post again.

SLOW SEDAN

iTrader: (13)

Ya having an auto vette is a fail anyways.

ddnspider

iTrader: (26)

Different strokes for different folks. Not everybody wants a big 4 door either but they don't hate on others that do.

SLOW SEDAN

iTrader: (13)

I agree even I don't want one. If they did hate on them I'd join them in hating the overweight junk that they are.

Kfxguy

iTrader: (1)

weight is equal to what? Gto is 3800lbs stock. Silverado is MOST DEFINITELY a good bit heavier.
silverado has 3.73 gears, 30” tall tires. Gto has 3.46 gears, 26” tall tires.

as I what? I’m just picky at how I like things. Something wrong with that?

what does yours idle at? Mine idles are 625rpm and I have the timing correction set to give less lope. Not that I have a problem with lope at all. I like the way it sounds, it’s just I can’t get a lower idle like I want to use less fuel.

my preference is an auto. And if it’s such a fail, why are the new ones coming with an auto now? Stupid gm, they didn’t get your memo. Lol.

Kfxguy

iTrader: (1)

I have three kids and I usually have more than me in the car except when going to work. As much as I’d like a vette, it’s just not practical for me at this point. Gotta make due with my heavy turd.

SLOW SEDAN

iTrader: (13)

lol ya different strokes for different folks, C8 doesn't appeal to me at all for numerous reasons. Least none of my manual cars will get stolen!

dreadpirateroberts

iTrader: (1)

No.

Please buy a cybertruck right meow.

No other car matters. Kthnx.

dreadpirateroberts

iTrader: (1)

All kidding aside, ever think of going G8 or SS? You could do to that what you've done to the GTO. And your kids wouldn't have to wait for the seat to go forward.

dreadpirateroberts

iTrader: (1)

nah, i just wanted to mess with you. especially since you're one of the few guys that keeps ls1gto alive.