LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Lt1 top speed question

Old 03-02-2009, 08:45 PM
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Yeah, I was being chased by a friend in his TA, I was on my 07 R1 (Power Commander, Gutted Y-Pipe, Two Brothers Exhaust) we were on a long *** strait away and I hit 183 and still had more. He told me he was pegged out almost and I was gaining major distance on him. So I would say around 160-65
Old 03-02-2009, 09:15 PM
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I've got a M6 and 3.92 gears, and I've run out of gear (not power!) in 5th...
Old 03-02-2009, 10:05 PM
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Originally Posted by ss.slp.ls1
You'll go faster in 5th gear.
haha yeah but im still on the stock rev limit around 5900 or so and find myself having to shift into 6th about 150-157ish with the 4.10s
Old 03-02-2009, 11:20 PM
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stock rev limiter but no speed limiter? any reason why?
Old 03-03-2009, 01:40 AM
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probably to save the engine. if there was no rev limiter people would blow their engines up trying to reach top speed
Old 03-03-2009, 11:10 AM
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Originally Posted by z_speedfreak
stock rev limiter but no speed limiter? any reason why?
Cars that weren't equipped with z-rated tires had a speed limiter...don't remember exactly what it was. And just so you guys know, I read that technically all fbody's are speed limited...but it's set at 255mph, lol.
Old 03-03-2009, 11:36 AM
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lower rear gear helps. why vipers come stock with a 3.08 gear and i am sure most vettes come with something similar. Then you need power...
Old 03-03-2009, 11:56 AM
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Originally Posted by ss.slp.ls1
Cars that weren't equipped with z-rated tires had a speed limiter...don't remember exactly what it was. And just so you guys know, I read that technically all fbody's are speed limited...but it's set at 255mph, lol.
mine would cut out at 110mph
Old 03-03-2009, 12:42 PM
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Originally Posted by hitmanws6
probably to save the engine. if there was no rev limiter people would blow their engines up trying to reach top speed
what I mean is if hes been as fast as he claims then he changed his speed limiter, so why didn't he bump up his rev limiter a bit is what im asking..?
Originally Posted by ss.slp.ls1
Cars that weren't equipped with z-rated tires had a speed limiter...don't remember exactly what it was. And just so you guys know, I read that technically all fbody's are speed limited...but it's set at 255mph, lol.
im pretty sure all fbod's came with speed limiters that depended on what tires the car came equipped with. mine came w/ zr's and the limiter was set to 145.
Originally Posted by xx_ED_xx
lower rear gear helps. why vipers come stock with a 3.08 gear and i am sure most vettes come with something similar. Then you need power...
vettes used to come w/ 3.42's, not sure what they come w/ now..
Old 03-03-2009, 01:20 PM
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Originally Posted by z_speedfreak

im pretty sure all fbod's came with speed limiters that depended on what tires the car came equipped with. mine came w/ zr's and the limiter was set to 145.
I wonder if that is something they did for obdII because when i was on my stock tune i was able to exceed 145mph without bumping into a limiter and my car originally came with ZR rated tires as well
Old 03-03-2009, 01:22 PM
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I've hit just a tad over 170 in my car tached out in 5th with 3.42's and 275/40/17 tires. Not bad for boltons. But thats the absolute most it could do. I just dont have enough power to keep pulling in 6th.
Old 03-03-2009, 02:00 PM
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Originally Posted by hitmanws6
probably to save the engine. if there was no rev limiter people would blow their engines up trying to reach top speed
i was pretty much a victim of that. i had to get away from the local sheriff so i flat footed her and never looked back. 6600 rpms in 3rd gear with a set of 25.7" and 2.73's out back = 184 mph. i know our tachs arent exactly the most accurate but they are pretty darn close. so ill call it 175 for arguments sake. later that week my connecting rod bearings failed and scored the crank .060 and the cylinder walls .020 but she's a healthy 9.8 :1 355 right now.
Old 03-03-2009, 02:10 PM
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Originally Posted by lt1performer
dont know if your trying to be a dick or being serious. if your being serious then sorry im just looking to see what the highest speed people have done in there lt1
Haha no not trying to be a dick at all man. I was just curious where i would be at. I dont know how fast iv gone because i dont know my rear gears and our speedo's only go to 155.
Old 03-03-2009, 02:26 PM
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Originally Posted by 93TAJ.C.
Haha no not trying to be a dick at all man. I was just curious where i would be at. I dont know how fast iv gone because i dont know my rear gears and our speedo's only go to 155.
not a problem man some people like to be dicks. from what i have been reading i think i ran out of power. At the time my camaro felt like she was still pulling but at the same time it felt like i hit a brick wall.
Old 03-04-2009, 01:48 AM
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how Many of you will end up as a pancake on the side of the road I wonder?
Ls1s with z rate tires a limited from the factory to 160mph so I would think lt1
with z rated tires would also be 160 or slightly lower

Last edited by mtuggle86; 03-04-2009 at 01:56 AM.
Old 03-04-2009, 01:50 AM
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Originally Posted by djjab57
i have an a4 & 2:73's i took mine to an open road with my garmin and i maxed at 164
My garmin was maxed out at 150, wouldnt go higher then that.
Old 03-04-2009, 01:55 AM
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Originally Posted by xx_ED_xx
lower rear gear helps. why vipers come stock with a 3.08 gear and i am sure most vettes come with something similar. Then you need power...
If where you running out of gear before power lower gears would help but most of use run out of power long before before gear so the highest gear you could use in 5th while not having to shift to 6th but still being drag limited would net you the highest top speed for that car

Also the viper uses a 3.08 because it has the trq to pull it
Old 03-04-2009, 07:27 AM
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My 95z, heavy mods, supercharged ect, I stopped at 164 MPH in 4th gear racing a 07 Lingenfelter Z06, and yes I was in front. Wont do that again on the street, IT IS STUPID and Dangerous...
Old 03-04-2009, 07:40 AM
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Originally Posted by nik1703
pretty sure the laws of physics would not allow an F-body to hit 270mph.

the veyron (1.5 million dollars) can barely hit 253mph ;]

according to top gear, the tires would wear bald in 12 minutes at those speeds, but thats okay because you'll run out of gas in 5 minutes ;]
Thats funny cus a 89 firebird holds the stock bodied land speed record at 308mph Yes that means a 3rd gen firebird is more aerodynamic than a Veyron or any other car on the planet. And a 4th gen aint too far off, have faith in your f-body.
Old 03-04-2009, 08:11 AM
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thanks for the info guys. ill go with i just ran out of power.

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