lugnut123

my 99 rex 300 awd is running very very high rpms on the highway, i want to compare the rpm and mph to your cars to see how far off my car is

hypervish

72 mph is ~3000 rpm.

20012003rx

60 mph is about 2250 rpm or so, 75 mph is about 2800 rpm or so. Good luck!

AnthonyMtz

Well when this model of Rx was made years 99-03 only had a 4 speed transmission so 40mph- 2100 rpm 60mph- 2600 rpm 80mph- 3200rpm 100mph- 4000+ rpm

kalali

The four people responded all are saying something totally different...
I'll drive ours tomorrow and report back - probably with something different too..Gotta love internet data collection..

hypervish

Here's some video proof (Look at the first second, at that point Lexmex is not accelerating very hard. You can see where the rpms are!) :

20012003rx

This is most accurate. I agree^. Does it rev high in Park? Or just in Drive on the highway?

Mors

tested mine last night: 60-2350, 70-2750, 75-3000
'02 RX

AnthonyMtz

Thank you i did this test a few month's ago also if its windy the rpm's can change about 200 more rpm depending on the wind drag and what type of octane and transmission you have (fwd or awd) as for me my and my test there was really no wind and my 2002 rx300 is Awd

AnthonyMtz

[QUOTE=AnthonyMtz;8539901]Thank you i did this test a few month's ago also if its windy the rpm's can change about 200 more rpm depending on the wind drag and what type of octane and transmission you have (fwd or awd) as for me my and my test there was really no wind and my 2002 rx300 is Awd running on 91 octane

lugnut123

its a 1999 Lexus Rx 300 awd, with the limited slip torsen option, roof rack, tow prep package, on stock 225/70/r16 Goodyear assurance tires. 164,000 miles and still running strong as always . i drove down to Florida not to long ago, at 80 mph it was between 3900-4100 rpm. i thought that this was ridiculously high, because overdrive was on. but i also looked at the LCD, in dash info system that said it was averaging around 20 does this sound normal

AnthonyMtz

No that doesn't sound normal @ 4,100rpm's im going passed 100mph and at 80mph im doing 3,100rpm's ,the readings your getting is what i had before my transmission fluid change...my fluid was black and once i changed it it shifted smooth as silk and the rpm's droped a good amount... Maby you need that done??

hypervish

A transmission fluid change can not change the gear ratio and/or the amount of gears. It is unlikely that you were running lower rpms after your transmission fluid change. Unless your fluid was so bad the torque converter was not locking, although i've never seen a situation where dirty fluid caused that.

AnthonyMtz

well i noticed a good drop in rpms when i changed my fluid, im pretty sure that my fluid changed helped...

ATLs460

I will second the doubt. Engine RPM's is dependent on gear ratio. It's simple mathematics.