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How Fast

This is a discussion on How Fast within the Firebird / WS6 forums, part of the Vehicle Specific category; Can anyone tell me what top speed is on a stock LS1 six speed Firebird?...

  1. #1
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    How Fast

    Can anyone tell me what top speed is on a stock LS1 six speed Firebird?

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    STAY PUFT thecorrectformula's Avatar
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    Around 165 MPH they'll hit the governor before it runs out of power.
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    Low 150, I think, or mid-160s for a WS6. I got a stock 1999 up to 145 MPH once, then backed off. It was still picking up speed.

    Damn, that was scary. They are still looking for me on I-78 in western NJ.

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    STAY PUFT thecorrectformula's Avatar
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    All the LS1 f-bodies are set at the same for 6 speeds and z rated tires. A formula and Trans am will go just as fast as a WS6. Same for Z28 and SS.

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    so if the governor stops it at 165 is there any way to increase the stop speed above 165? is it even good for the car to go above that? obviously they limit it for a reason..

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    Quote Originally Posted by M-Ten View Post
    so if the governor stops it at 165 is there any way to increase the stop speed above 165? is it even good for the car to go above that? obviously they limit it for a reason..
    You can use a programmer (Diablo, superchips, hypertech etc...) to disable the speed limiter.

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    Senior Member M-Ten's Avatar
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    but that can potentially damage something right? they have to limit it at 165 for a reason, so is there some aftermarket parts you would need to get before disabling the speed limiter?

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    2 SS's are better than 1 Jays00ss's Avatar
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    Quote Originally Posted by M-Ten View Post
    but that can potentially damage something right? they have to limit it at 165 for a reason, so is there some aftermarket parts you would need to get before disabling the speed limiter?
    no, They do it for federal regulations and so you dont kill yourself. Just make sure you have the tires that are rated to go that fast (ie: Z rated tires) I really don't know too many places where you can get up that high and maintain it for very long anyway. But hey I'm the idiot with a SS camaro in the slow lane always doing the speedlimit anyways.

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    Quote Originally Posted by M-Ten View Post
    but that can potentially damage something right? they have to limit it at 165 for a reason, so is there some aftermarket parts you would need to get before disabling the speed limiter?

    I forgot about the governor. The dealer told me it was governed to not exceed the safety rating of the tires. I think I recall him saying it was governed at 155, but I'm old and don't remember things well. What did you ask anyway?

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    Senior Member M-Ten's Avatar
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    lol @ jay hey nothing wrong with following the rules!! CHD, i didn't ask anything.. thecorrectformula said it tops out around 165, i was just curious if it was safe for your car to go above that

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    whats the point in the governor. once u hit 165, ur dead if anything happens, so it doesnt matter if ur goin 165 or 300mph.

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    Senior Member M-Ten's Avatar
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    Quote Originally Posted by ATCharming View Post
    whats the point in the governor. once u hit 165, ur dead if anything happens, so it doesnt matter if ur goin 165 or 300mph.

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    Member VTR99's Avatar
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    All the LS1 f-bodies are set at the same for 6 speeds and z rated tires. A formula and Trans am will go just as fast as a WS6. Same for Z28 and SS.
    I'm not sure what the exact truth is, but I have read on at least a dozen sites that the top speed for the SS and Z28 is limited to 160 mph, and the top speed for the Trans Am is limited to 167. I also read the verts are limited to 155 mph. Of course there are a variety of other sites reporting different numbers, but these are the numbers I have seen most often.

    V6 Firebirds will reach in excess of 130 mph (4th gear limited) with the Y-87 performance package and a 5-speed transmission, whereas V8 models that had Z-rated tires had a speed limiter set to 167 mph.
    http://en.wikipedia.org/wiki/Pontiac_Firebird

    Top speed is governed at 160 mph in SS models, 108 in Z28s, unless you opt for speed-rated tires.
    http://www.internetautoguide.com/rev...002/index.html

    The Vert...

    http://www.theautochannel.com/vehicl...ergap0142.html
    Last edited by VTR99; 08-29-2007 at 09:23 PM. Reason: More info

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    Okay so basically the LS1 f-body with speed rated tires will do inbetween 155 and 170 if you have the space.

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    Quote Originally Posted by CHD View Post
    Low 150, I think, or mid-160s for a WS6. I got a stock 1999 up to 145 MPH once, then backed off. It was still picking up speed.

    Damn, that was scary. They are still looking for me on I-78 in western NJ.
    i know i was driving thru jersey yesterday in my semi and they had road blocked i asked cop whats wrong, said looking for a transam,lol

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    car enthusiast djvaly's Avatar
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    I did 175-180mph on the 402 ls2 block...

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    Cool

    Just take it out and see how fast it will go. If it tops out before you run out of nerve, then worry about it. If not, call it good!

    I've had mine for nearly 4 years and have not exceeded 150 but the car was willing.

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    Quote Originally Posted by djvaly View Post
    I did 175-180mph on the 402 ls2 block...
    Where did you go that fast in our area? There's a stretch of the George Bush Turnpike from Plano to Garland where you can maybe get that fast if no one else is on the road. Or LBJ from the Hi-5 to around the Tollway. I usually run out of road or into traffic by the time I get in the 120's.

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    I have topped out the speedo and i still have the limit on

  20. #20
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    Quote Originally Posted by p_funk22 View Post
    Where did you go that fast in our area? There's a stretch of the George Bush Turnpike from Plano to Garland where you can maybe get that fast if no one else is on the road. Or LBJ from the Hi-5 to around the Tollway. I usually run out of road or into traffic by the time I get in the 120's.
    if I told u I'd have to kill you well depends what time of the day/night... and yeah a tollway or turnpike is very ideal... where you got 3-4 lanes, well lid, and nothing in the horizon ...

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