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Old Dec 12, 2008 | 10:53 AM
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1998Z20what?'s Avatar
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Default 12.9 auto guys

Im looking to see what your 1/8 mile time /mph and 1/4 mile time/mph were as well as your 60 ft.


im lookin mainly for ls1 automatics prefferably stock weight with longtubes exhuast and airlids only ..sounds random i know, but i need this info to tune my car, because i had these mods and now i have a stall and cant find my old times and the tuner wants to see these, so im going on the closet findings.

i ran 12.9 @ 110 with a 60' of 2.3 and dont remember my 1/8 mile info.
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Old Dec 12, 2008 | 12:01 PM
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I have a time slip were i ran 12.92@108w/1.96 60ft. 1/8 was 8.33 @85 MPH.I have them ranging from 13.00 to 12.61 so let me know what you need to know.
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Old Dec 12, 2008 | 12:36 PM
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I ran consistantly 13.0s @ 106s when I had only longtubes/lid/true duals/2.73s. 60s : 2.0

Stall,3.42 and tune added, I ran 12.6-12.7 @ 108s. 60s: 1.8-1.9

LS6 intake/ 28.8 lbs inj and MT ET street later, I ran 12.2-12.3s @ 110s. 60: 1.7-1.9
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Old Dec 12, 2008 | 12:39 PM
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i ran a 12.6 at 111, w/a 1.9 60 foot.
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Old Dec 12, 2008 | 01:07 PM
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cool i think this might be what i need, when i get home ill match up this info with my time slip. I also switched from true duals to a pacesetter off road y pipe, im thinking maybe thats where i lost my 5mph top end cuz that y pipe looks like it could be restrictive.
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Old Dec 12, 2008 | 01:18 PM
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While I have quite a bit more I ran a 12.849 @ 107.77 in the 1/4

8.298 @ 87.074 in the 1/8 with mods in sig and UMI relocation brackets.....

I noticed a lot of cars trap higher than mine. I'm guessing me not having a tune and running rich might cause that
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Old Dec 12, 2008 | 02:11 PM
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ya thats what im thinking, i know my o2 sensors are shot and my fuel economy dropped way low, its common to lose a couple mpgs with a stall sometimes but im getting 11-13mpgs driving normal, so im gonna fix my o2's and get it retuned..running rich can cause this loss of mphs .
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Old Dec 12, 2008 | 02:30 PM
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I ran 12.99@ 108.5mph with a 60' of 2.07. My 1/8 mile was 8.4@86.8mph. At the time I had lt's, y, catback and a lid/ls6 intake. I only got one run in though and think I could have done better with some more seat time.
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Old Dec 12, 2008 | 05:19 PM
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see with the stall my 1/8 mile was a 8.2 @ 84.97 mph..it was higher with my pre-stall and tranny.
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Old Dec 12, 2008 | 05:39 PM
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You usually lose some MPH with stalls....
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Old Dec 12, 2008 | 05:54 PM
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I can't find my 13.0s slips but I did find my 13.1s.


****




These timeslips above were taken the same season but different tracks. Bolt ons minus LS6 intake/MT ET streets.


These are my best runs w/ LS6 intake/MT ET streets.
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Old Dec 12, 2008 | 06:34 PM
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awesome thanks alot brother, that actually helped alot..thanks
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Old Dec 13, 2008 | 01:04 AM
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Lid, Pacesetters, ORY and 18" Sweet Thunder

60....... 1.985
330...... 5.544
1/8...... 8.437
MPH..... 85.92
1000.... 10.889
1/4...... 12.984
MPH..... 106.80
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Old Dec 13, 2008 | 01:39 AM
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cool i got what i need thanks again guys.
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Old Dec 13, 2008 | 01:23 PM
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Originally Posted by RaggedRides
Lid, Pacesetters, ORY and 18" Sweet Thunder

60....... 1.985
330...... 5.544
1/8...... 8.437
MPH..... 85.92
1000.... 10.889
1/4...... 12.984
MPH..... 106.80
hey raggedrides, i see in your sig that your y pipe bangs. Mine is bad also around 4-5k. Do you notice any performance loss when it bangs,like your getting knock retard when it bangs??? I feel like i can feel the car lose power when it does.
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Old Dec 15, 2008 | 01:29 PM
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Originally Posted by fbodyman1026
hey raggedrides, i see in your sig that your y pipe bangs. Mine is bad also around 4-5k. Do you notice any performance loss when it bangs,like your getting knock retard when it bangs??? I feel like i can feel the car lose power when it does.
Loosen your Y-Pipe and adjust it, if that doesn't cure the banging, fix/replace your motor trans mounts
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Old Dec 15, 2008 | 04:13 PM
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Originally Posted by Kingc8r
Loosen your Y-Pipe and adjust it, if that doesn't cure the banging, fix/replace your motor trans mounts
I know I need to get to that done but right now it's sitting in my garage for winter.
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Old Dec 17, 2008 | 04:30 PM
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This may not help since i have a c5. but here is some more data
60' 1.866
1/4 12.881
mph 107.45

car has a blackwing aircleaner, 3400 stall with 3.42 gears, 159k on motor, valve covers never off. Trans/rear gear done by RevXtreme in Sarasota. 6.0 motor coming 2009.

you guys are running past me on the top end.
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Old Dec 17, 2008 | 10:28 PM
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Given your 60 and mph you were probably in the 8.4-8.5 range. Why does your tuner need this info?
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Old Dec 26, 2008 | 01:51 PM
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Originally Posted by fbodyman1026
hey raggedrides, i see in your sig that your y pipe bangs. Mine is bad also around 4-5k. Do you notice any performance loss when it bangs,like your getting knock retard when it bangs??? I feel like i can feel the car lose power when it does.

I was scared of it pulling timing in the beginning, but I don't think it's hurting anything. I ghetto rigged it with a piece of heater hose, which stopped the banging. After a few runs it'd come loose and start again. It ran consistent, regardless.

Like King said, I ought to loosen mine up and see if I can get it figured out.
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