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

Speedometer ?

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Old 08-15-2007, 05:47 PM
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Default Speedometer ?

The search isn't working right now, but I was curious. Why do some firebirds, mostly the formulas, usually 93-94, have a speedometer that goes only to 110? I was looking at 0-60 and quarter mile times online(i know you can't trust these), why does the 94 formula seem to be the slowest of the LT1 birds? I that a myth, or are they really slower?
Old 08-15-2007, 05:50 PM
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The packages, just that simple. And related to tire rating a bit.
Old 08-15-2007, 05:57 PM
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So roughly how quick should a stock formula from 94 run the quarter? Is there a limit to the top speed besides tire rating?
Old 08-15-2007, 07:00 PM
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Cars that came without the 'Z' rated tires got a 115 mph speedo and a speed limiter of (if I remember right) 108 mph, which shuts off fuel to the car when it hits (I know, i've hit it MANY, MANY times!!).

Sara Lou
Old 08-15-2007, 07:04 PM
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Originally Posted by Zralou
Cars that came without the 'Z' rated tires got a 115 mph speedo and a speed limiter of (if I remember right) 108 mph, which shuts off fuel to the car when it hits (I know, i've hit it MANY, MANY times!!).

Sara Lou
mine was 112, blasted thing got on my friggin nerves...not sure if there was any difference in the Birds and Z's or not or the 1 yr difference either...
Old 08-15-2007, 07:18 PM
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my 94 B4C had a 150 speedo, and the one time i was in a hurry, the last time i looked down, it was creeping towards 130, so I think the 94 formula's and zs differ in that sense?
Old 08-15-2007, 07:23 PM
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Originally Posted by GreenBlood
my 94 B4C had a 150 speedo, and the one time i was in a hurry, the last time i looked down, it was creeping towards 130, so I think the 94 formula's and zs differ in that sense?
nope, B4C's didn't shut off, mine didn't have the Z rated tires from the factory, had a 150mph speedo, and shut off at 112
Old 08-15-2007, 07:56 PM
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both my '94 Z28s have the 155 speedo and 3.23 gears, no govenor

I was under the impression that the 110 speed was for 2.73 cars or possibly those with the 235/55 tires
Old 08-15-2007, 08:01 PM
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Originally Posted by Zralou
Cars that came without the 'Z' rated tires got a 115 mph speedo and a speed limiter of (if I remember right) 108 mph, which shuts off fuel to the car when it hits (I know, i've hit it MANY, MANY times!!).

Sara Lou

Z tire rating is for 149 (or there about speeds)
look for code QLC (245/50) or QMT (235/55 standard size)
Old 08-15-2007, 08:10 PM
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Originally Posted by fast
both my '94 Z28s have the 155 speedo and 3.23 gears, no govenor

I was under the impression that the 110 speed was for 2.73 cars or possibly those with the 235/55 tires

you are correct sir
Old 08-15-2007, 10:33 PM
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my 94 formula m6 had the 155 speedo. i did see a 94 t/a tho that had the 110 speedo. it looks dumb. i know all the v6s had the 110.
Old 08-15-2007, 11:44 PM
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is it possible to swap in a 155 speedo and reprogram the computer?
Old 08-16-2007, 08:40 AM
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bump for possibility
Old 08-16-2007, 06:04 PM
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evening crew
Old 08-16-2007, 06:50 PM
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not sure if it requires reprogramming (sure any tuner could do it if needed)
but swapping it is easily doable
Old 08-16-2007, 11:28 PM
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where could i find a nice set of gauges, how hard would the install be, i have never done anything like that before. I've only done exhaust, wires, plugs, etc. you know, small ****...
Old 08-17-2007, 12:06 AM
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Originally Posted by GreenBlood
where could i find a nice set of gauges, how hard would the install be, i have never done anything like that before. I've only done exhaust, wires, plugs, etc. you know, small ****...

the gauge swap on the birds are easy, my understanding is it's just plug and play swap...I just recently swaped to the newer style (98+) in my 95 Z and it was a PITA.....but was worth it in my eyes
Old 08-17-2007, 12:07 AM
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where can i get the parts for the bird swap? does anyone have a write up of an install?
Old 08-17-2007, 12:42 AM
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my car sat on the needle a couple times......then the gas gauge switched needles...so i cut that out :-)
Old 08-17-2007, 08:14 AM
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Originally Posted by GreenBlood
where can i get the parts for the bird swap? does anyone have a write up of an install?
bump...



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