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Discussion Starter #1
I've read that the Lexus GS400 is capable of attaining 180mph if its speed govenor is disabled. It does have a low drag coefficent and a short frontal area. So do you think this could be true? The car is governed to 150mph and I've had my GS400 to 145mph myself and it was still accelerating strongly......... Also, why is it that the IS300 has the same top speed as the GS300 (143-144mph). The IS is lighter, more aerodynamic, and has a shorter frontal area. Does it have to do with the final drive ratio?
Eric......
 

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Eric, your GS 400 is limited to 149 and I, too, heard they pulled the governor on a stock 400 and landed in the 170s. I was floored when I heard this.
 

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Discussion Starter #3
Brad,
Does that make sense? 170+mph is supercar territory. The GS400 only has 300hp and 310lb/ft of torque (less on the dyno)....
Eric....
 

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I remember reading some where that the top speed for the gs400 was 167mph or somthing like that, is was just short of 170. The reason I think that the gs300 and is 300 have similar top speeds is becuase the is limited like the gs
 

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Eric,

What was your rpm's at 145mph? That should give you some idea. I would guess at least 160mph. However, to bust 170mph takes exponentially more power but you never know. I think my 91 M5--from what I have heard from Euro owners--is easily capable of 160mph with the governor removed. Even on the Autobahn there is rarely enough room to try.
 

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It sounded totally ridiculous to me as well. I will see if I can run down the article that might shed some more light on this.
 

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Discussion Starter #7
I'm positive that the GS300's top speed is Not Governed. I don't think the IS300's top speed is governed either (but I could be wrong)..... The old generation BMW 750iL (1988-1994) (296 horsepower/332lbft torque) was governed to to 155mph). It weighed 4235lbs, and had a drag coefficent of .34. The ungoverened top speed of that car was 168mph. So there is a possibilty that the GS400 could be faster...
Eric....
 

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I read a review of the IS somewhere that said that it was limited to 144 MPH due to drag. Is this true? Other articles claim it is electronically limited. Has anyone tried to take it to that speed? What's the top speed in the GS300?

[FROM Webmaster: I've gotten to 130...]


[This message has been edited by webmaster (edited July 17, 2000).]
 

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I saw the review in Automobile Mag. They mentioned that the IS300 was limited to 144mph by drag.

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2001 IS300 - White
1999 RX300 4WD - White
 

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Discussion Starter #10
yes, and the GS300 is limited by drag at 144mph too....Maybe the GS300's 144 mph claim is exaggerated. Lexus claimed that the old GS300 (1994) had a top speed of 144mph. However, when Car & Driver did their road test, all they could get was 134mph... that's it. 10mph slower than Lexus reported...
Eric...
 

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Erik, where did you read that it could hit 180... I have a very hard time believing that. I've driven even a modded GS400 quite a bit, and it doesn't feel capable of even 170. Way up there it takes a LOT more hp (+low drag) to get any faster. The difference between 170 and 180 is infinitely more than 150-160.

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Kenny
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Discussion Starter #12
F=ma,
I'll try to find that article which, I read on the net. I think I searched (GS400 Top Speed or Lexus Top Speed) in one of the search engine. However, it indeed read that the ungoverned speed was 180mph. Brad read a similar article stating the top speed was into the 170's. If someone finds that info/article, could they please post it and let us know. Thanks...
Eric.....
 

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Discussion Starter #15
Webmaster,
I do my top speed run on the way to visit my parents (in central, PA)... There is a VERY nice straight away I-99 North(220Northbound)and it's the perfect place. No place for the cops to hide because you can see so far in front of you. I hope no cops read this post. Several years ago I had my father's 1993 750iL at 160 indicated (prob actually 155) and had my old 1988 928 Porsche S4 at around 170 indicated. With plenty of room to spare. It's about a 2 mile long stretch...SHHHHHHHH don't tell anyone...If you brought your IS300 there, I guarantee top speed. My GS400 was very stable at 145mph (probably due to the large spoiler.) I have yet to take that to I-99.. I hope I live to tell the story
Eric...
 

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Personally, I do not encourage anyone to drive their car at top speed. Particularly in the USA where it is HIGHLY ILLEGAL unless you are on a private track.

Hey Tony - that was a "closed course with a professional driver", right?

[From Webmaster - Yup, You betcha. Do not attempt this at home]



[This message has been edited by webmaster (edited July 17, 2000).]
 

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Discussion Starter #17
Yes.... I see your point and I shouldn't have posted the above or condoned such driving. I must be out of my mind.... My apologies...
Eric.....
 

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Eric, Since you're going up to ~150 anyway, could you possibly get us a 0-150-0 time for the GS 400? And to be fair, put on a new set of tires when you leave your house. Thanks
 

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Discussion Starter #19
I'll tell you what Nate, why don't you write a letter to the editors at Road & Track and ask them to do a sports sedan 0-150-0 comparison and include the GS400. They don't care about tire or brake wear. "Most" of my Top Speed runs were performed when I was younger and foolish. I'm in the process of becoming a physician so I should set a better example.
Eric.....
 
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