LS1 Z28 2002

I shift at 8,000rpm's



lol joking

i think shifting at 2,000rpm's the best

JD_AMG

RB30s are high strung 6 cylinders made for high RPM operation, the LS1 is a relaxed V8 made for a nice flat torque curve right off idle. The autos (depending on gearing) will shift anywhere from 1,500-2,500 RPMs under normal driving. Again he has absolutely nothing to worry about, I have never heard of anyone rebuilding an LS1 because they babied it too much.

1979rs/z28

iTrader: (21)

I shift at 2k. Averaged 22.6 mpg last tank 60% city 40% highway.
The tank before doing the same driving with a little more highway beating on it got 17 mpg. I believe its better on the engine to shift it early than to beat on it from every stoplight.

LS1nut377

iTrader: (16)

well my friend has heads cam tuned m6 ss and he usaully shifts around 1800 intown skipping 3rd going to forth and keeps it under 40mph and he gets about 21-22mph with highway driving included at 60mph in 6th.

rs94z28

iTrader: (3)

yes, have a monitor in 98, drive on a federal parkway frequently where the limit is 50 mph,(i usually run about 58 to keep from downshifting) ...if i get behind someone actually doing the limit....i get much better fuel usage dropping down to 5th until i can pass....on the interstate...about 76-78mph seems to be the 'magic' number in this car for the best fuel economy...you can lock in your cruise and set the monitor for fuel trim and watch to see where it works the best!!! every car is different !!!

mild cam, LT headers, LS2 intake, bigger injectors and 92 FAST TB, still get 26mpg unless i'm hammerin' on it...have never gotten less than 21 and change....i DO skip gears a lot, normal driving usually shift around 2k....

fuel shutoff....what's that ???

99_SS_LS1

iTrader: (4)

Shift points are relative to throttle percent. More throttle = higher shift points.

Basically I'd say you want to shift right before the car stops accelerating in that gear. for example 1st gear at 1/2 throttle might be near 25 mph or so (sadly it's winter here and I can't remember the gearing on that car as I've got used to my dd that's also a stick)

dutinsss

iTrader: (2)

i usually shift around 2500 and try not to cruise too much lower than about 1400. my little rule of thumb for cruising with stock 3.42's is 3rd at 20mph, 4th at 30mph, 5th at 40mph, and 6th at 55mph.

TheBlueKnight

iTrader: (4)

Your gonna find most people shift around 2,000rpm, I've been through threads like these too many times to count

mjr_350

I'll have to go against that there.

On the freeway in 6th gear at 110km/h (68 MPH) i get 11L/100km (21.4 MPG)

If i step it up to 125-130km/h i get around 8.5-9L/100km (26-28 MPG)

And if i cruise in 5th gear at 105km/h i get around the same as the 130km/h in 6th gear.

So my thoughts are they like to be around 2200rpm for good fuel consumption.
Any lower and they struggle.
Hook up a vaccume gauge and you'll see what i mean when it comes to the engine working harder in 6th gear

Actually might get a short vid next time im out on the freeway

lemons12

iTrader: (71)

they get best gas mileage when cruising on the highway at 1800rpms.. nothing lower, nothing higher... should be about that with stock gears at around 70 in 6th gear.

raysadude

iTrader: (11)

how?

the best i get(when i drive like a granny just got out of the hospital) was 18mpg

mjr_350

Will thats not the case with me. Stock box with stock 3.46 rear

And also why are guys over here claining to get batter fuel consumption with higher diff gears 3.73's and 3.9's.

Proofs in the pudding

lemons12

iTrader: (71)

stock 3.46s, huh.....


depends on what you talking about.. if you go from 323s-373s your in town will stay the same or slightly increase and your highway will increase... as long as you keep your foot out of it..
and visa verse..

mjr_350

Yea one of the ratio's for our VY (02-04) LS1 commodore over here is 3.46:1 for 6 speed and the auto's have 3.08:1

The newer VZ (04-06) has 3.73:1 diff ratio for the 6 speed and 3.07:1 for the auto

What final ratio do you have in your T56 LS1 powered cars

Arctic2002ss

You are not hurting a thing. You should know if you are lugging it, it will kind of surge or buck and just not feel right. Now cammed cars, on the other hand, don't like low RPMs. Mine does not like to cruise below 1600.

Here is a fuel economy question though. I took a road trip recently and got better mileage when my average speed was higher (80-85 vs. 70). Is the cam more efficient with a little more RPM? I actually measured 28.8 from Georgia to Louisiana! Oh, I have 3.73s too.

Scoggin Dickey

iTrader: (34)

Shifting or cruising THAT low might actually hurt your MPG, but it won't hurt your engine if you aren't under load. You will find that many people here get better mileage at 78-80mph than at 70mph. Lower RPM doesn't mean greater gas mileage if it's in an inefficient RPM range for the engine. Sometimes slightly higher RPM is a more efficient operating range of the engine and you will see better mileage at the higher rpm.

b-ron

i second this

skr1bol

y ai got this dudes back all my homies and me shift at 2000 or 2500 rpms saves u gas if u keep the rpms lower haha and try not to have the rpms at like 1300 thats a lil to low that berns more gas then at 2200 rpms

91RS383

^^^ rpms have little to do with MPG, they count, just not as much as you would expect. Your MPG is determined by how much vacuum your pulling. If the throttle has to be wide open at 1200 RPM to maintain speed you will get crappy mileage. If the throttle can be almost closed at 2600 RPM for the same speed your MPG will go up.

You want to be in which ever gear allows you to use the least ammount of skinny pedal.

brians91formula

iTrader: (12)

35mph in 5th gear is usually fine as long as its down a hill or on a flat surface. When going up a hill either go faster or downshift. I typically shift anywhere between 1800 - 2500 rpm depending.