What RPM does the GS400 cruise at on the highway?
02-14-03, 09:28 PM
#16
Lexus Champion
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Allright well I just got a GS400 of my own a few weeks ago and after watching the RPMs it seems to tach right around 2,250 at 70 MPH as long as I'm not really accelerating or going up a steep incline.
I'm pleasantly surprised... I guess the 300s must tach higher at cruise, because it was nowhere close to 2800.
Er... well, actually it was, but that was also when I was going a bit over the speed limit...
I'm pleasantly surprised... I guess the 300s must tach higher at cruise, because it was nowhere close to 2800.
Er... well, actually it was, but that was also when I was going a bit over the speed limit...
02-14-03, 11:40 PM
#17
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about 3000 while 80mph
2003 GS300
3000 rpm while 80 mph..
2000 Acura 3.2tl
1800 rpm while 60 mph
2001 BMW 325i
2900 rpm while 65 mph
I figure out that I-6 engine has higher rpm than V-6 or V-8
3000 rpm while 80 mph..
2000 Acura 3.2tl
1800 rpm while 60 mph
2001 BMW 325i
2900 rpm while 65 mph
I figure out that I-6 engine has higher rpm than V-6 or V-8
02-15-03, 08:37 AM
#19
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Threxx, a quick, simple explanation of why.
The revs of the engine will have more to do with how an engine is desined than it's size (i.e. V6 vs. V8). By design I mean your Silverado is an in-block cam engine (OHV) which revs lower than an overhead cam (OHC) engine like the GS - or any Lexus for that matter. The GS has four cams. This design allows for quicker and higher revs than in-block cam. Where in-block cam usually has much of the available tourqe at lower rpm's.
You'll also notice that, in general, the redline of an OHC engine is higher than that of an OHV engine.
The revs of the engine will have more to do with how an engine is desined than it's size (i.e. V6 vs. V8). By design I mean your Silverado is an in-block cam engine (OHV) which revs lower than an overhead cam (OHC) engine like the GS - or any Lexus for that matter. The GS has four cams. This design allows for quicker and higher revs than in-block cam. Where in-block cam usually has much of the available tourqe at lower rpm's.
You'll also notice that, in general, the redline of an OHC engine is higher than that of an OHV engine.
Last edited by LexRX; 02-15-03 at 08:39 AM.
02-15-03, 09:52 AM
#20
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Originally posted by LexRX
You'll also notice that, in general, the redline of an OHC engine is higher than that of an OHV engine.
You'll also notice that, in general, the redline of an OHC engine is higher than that of an OHV engine.
I checked today and my car was at 2300rpm at 70 pretty consistently. (I have an upgraded TC also, but it doens't seem to matter while cruising - only accelerating).
02-15-03, 11:24 AM
#21
Pole Position
Originally posted by bitkahuna
Yup - I think a Vette's redline is only about 4500rpm!
Yup - I think a Vette's redline is only about 4500rpm!
I don't think so! These engines are actually very advanced and not as primitive as folks might think.
The "regular" vette (LS1) redlines at 6,000 rpm and the Z06 (LS6) at 6500.
FWIW: The cruising RPM is determined by the engineers to provide the best trade-off of fuel economy, acceleration and general tractability of the engine in "everyday" driving. To accomplish this they play with the transmission ratios by typically having one 1:1 gear and then an overdrive anywhere from .69 to .87:1. They also choose the differential drive ratio to help balance the amout of time the engine stays in it's powerband and it's ability to provide higher gas mileage (long legs so to speak).
I don't think I'm doing a good job of explaining but...
02-16-03, 08:19 PM
#22
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To add to Mr. Johnson, the more gears you have, the lower your RPM at speed. Back in the day, imagine when cars had 3 speed autos and the gearing?!?!?!
Now we have 6-speed autos, which allows for hard acceleration AND cruising comfort.
I noticed in the 5-speed manual ES 300 (V-6) the car is at 4,000RPM at 80mph and in the 5-speed automatic GS 400(V-8) the car is at 3,000RPM at 80mph. So the car is less loud at this speed (since you should be cruising). I want to say the 4 speed automatic SC 400 (V-8) is at 3500RPM at 80mph.
Now we have 6-speed autos, which allows for hard acceleration AND cruising comfort.
I noticed in the 5-speed manual ES 300 (V-6) the car is at 4,000RPM at 80mph and in the 5-speed automatic GS 400(V-8) the car is at 3,000RPM at 80mph. So the car is less loud at this speed (since you should be cruising). I want to say the 4 speed automatic SC 400 (V-8) is at 3500RPM at 80mph.
02-16-03, 08:30 PM
#23
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1SICK - I have to argue this one..
"To add to Mr. Johnson, the more gears you have, the lower your RPM at speed."
Yes I agree, but I think the gearing setup has more to do with it.
The 4 speed in the LS revs lower at the same speed compared to a 5 speed in another LS or GS..
"To add to Mr. Johnson, the more gears you have, the lower your RPM at speed."
Yes I agree, but I think the gearing setup has more to do with it.
The 4 speed in the LS revs lower at the same speed compared to a 5 speed in another LS or GS..
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