95 9c1 vs impala ss - Chevy Impala SS Forum
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post #1 of 18 (permalink) Old 09-05-2013, 01:39 PM Thread Starter
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95 9c1 vs impala ss

Hi. I'm 17 and traded my gtp for a 95 caprice 9c1 because I love the b-body style.....my uncle has a 94 impala ss and says that the lt1 in my car is detuned and slower than the ss but I thought that the power output and gearing were the same.....if I posted in the wrong section I'm very sorry but I'm new to the forum and want to know if I stand a chance...
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post #2 of 18 (permalink) Old 09-05-2013, 01:52 PM
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Your uncle, sadly, is without a clue
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post #3 of 18 (permalink) Old 09-05-2013, 01:54 PM Thread Starter
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Can u give me more info please
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post #4 of 18 (permalink) Old 09-05-2013, 01:55 PM
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This site contains info for that, tons of it. Spend some time, ready sticky threads at the top of sections, etc.
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post #5 of 18 (permalink) Old 09-05-2013, 01:57 PM Thread Starter
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Well I see that the drivetrain is identical but can't find info on computer calibration and weight differences
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post #6 of 18 (permalink) Old 09-05-2013, 02:15 PM
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Doug,

the 94's had a few things that were different, that infact made them slightly faster.

my 94 was always the fastest out of all my bbody (unmodded)

at least it was a 94 9c1, I am not 100% sure if the SS had the same items.

if I recall, they had different push rods, different cam, and a few other small differences.

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Go fix your fleet of 91's. I wipes my tushy with TBI.......
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Much like date night with BK, this isn't about what you prefer.
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post #7 of 18 (permalink) Old 09-05-2013, 02:21 PM Thread Starter
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Well I don't kno how the caprice runs now but my gtp was slightly faster than the impala. . Hes telkibg me that not only does my caprice get less gas mileage but its slower and it was a dumb trade
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post #8 of 18 (permalink) Old 09-05-2013, 02:40 PM
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Quote:
Originally Posted by new9c1 View Post
Well I don't kno how the caprice runs now but my gtp was slightly faster than the impala. . Hes telkibg me that not only does my caprice get less gas mileage but its slower and it was a dumb trade
well it really depends on the condition of both cars.

can we see some pics?

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Much like date night with BK, this isn't about what you prefer.
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post #9 of 18 (permalink) Old 09-05-2013, 03:03 PM
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Welcome to the forum and congrats on your car. enjoy it and look through the stickies here as there is a ton of info gathered over the years along with lots of helpful members.

as for which is faster.....The enlgines if they are both LT1's should be pretty much the same. Some 9c1s have the smaller L99 (4.3 vs 5.7) engine but all Impalas came with the 5.7.

Another factor in which car would be faster is gearing. I believe all SS's came with a 3.08 gear and some 9C1's would have a 3.23 or a 3.42 from the factory. If the engines are identical, I would think the car with a 3.42 would be faster.

================================================== =============


'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
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post #10 of 18 (permalink) Old 09-05-2013, 06:45 PM
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Quote:
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The only important engine differences between any 9C1 with LT1, and an ImpalaSS of the same year, would be the speed limiter in the program. Any other differences in the programs are either negligible and irrelevant, or nonexistent.

9C1s were limited to 130MpH only when equipped with 'H' rated 225/70R15 tires. Most of those were L99s, but some 9C1-LT1s were ordered with 225/70R15 tires.
9C1s were limited to 149MpH when equipped with 'V' rated 235/70R15 tires.

Impalas SS were limited to 154MpH, due to a driveshaft resonance issue.

Civilian Caprices [regardless of engine] were limited to 108MpH. The original tire spec for these would be 'S' rated 235/70R15.

All B-LT1 engines for a given year were identical, as far as the hardware is concerned.
This is the correct info. Many LT1 9c1's including my federal car were ordered with 225/70R15 tires. The speed limiter is easily removed when you have your PCM tuned. L99 9c1's have 3.23 gears, LT1 9c1's have 3.08 gears, the same as the Impala. The Impalas had Posi (G80) standard and it was an option on the 9c1's.

There is no significant performance difference between the LT1 3.08 Posi 9c1 and the same year Impala SS.

Jim B.

'95 9c1, pcmperformance.com 93 tune, Dynomax Ultraflo catback, K & N box filter, LT4 KM, 160 stat, 3.08 Posi.
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