Whats with my mph?
Thread Starter
Joined: Sep 2004
Posts: 2,447
Likes: 6
From: Grand Junction, CO / Tomball, TX
Whats with my mph? So I have never ran my car other than totally stock which ran a 13.56 @ 102mph 2.1 60ft. I ran it last night for the first time modded and it ran 12.54 @ 105mph 1.83 60ft. How the hell did I knock off half a second and only gain 3mph? What am I doing wrong? The car barely spun off the line, barely. Mods are below:
Lid, ported tb, LS6 intake, LTs, X-pipe, Yank 3800
Also I have 2.73 gears.
Lid, ported tb, LS6 intake, LTs, X-pipe, Yank 3800
Also I have 2.73 gears.
i think i asked someone this before. they say when u hook really good, your mph wont be as high. i ran a 13.22 @ 111mph with a 2.24 60' then another time ran a 12.71@111mph with a 1.9 60' but i think stalled autos are alot different than M6's
Ive noticed that stalled autos, mod for mod with a m6 might/will run faster, but have a slightly slower trap speed
gearing is probably a factor too
A4 M6
1st 3.06 1st 2.66
2nd 1.62 2nd 1.78
3rd 1.00 3rd 1.30
4th .70 4th 1.00
5th .74
6th .5
as you cross the line, just getting into 3rd? we are already into 4th (closer gear ratios and rear ratios too) 3.42 rear
Ive noticed that stalled autos, mod for mod with a m6 might/will run faster, but have a slightly slower trap speed
gearing is probably a factor too
A4 M6
1st 3.06 1st 2.66
2nd 1.62 2nd 1.78
3rd 1.00 3rd 1.30
4th .70 4th 1.00
5th .74
6th .5
as you cross the line, just getting into 3rd? we are already into 4th (closer gear ratios and rear ratios too) 3.42 rear
Last edited by 98TADRIVER; Apr 8, 2006 at 12:15 PM.
Hey buddy, im in the same boat.....Stock was a 13.81 @ 102, now with full boltons, 3600 stall, 3.73's, and even cammed i went 12.90 @ 106. My et does not bother me because i was on shitty sumitomo radials, but 106 F****** sucks. Its not tuned, but i dont see me pickin up that much more MPH. Hell my buddies 01 SS M6 went 109 on just a lid 
11 Second Club
Joined: Oct 2005
Posts: 1,847
Likes: 1
From: Sandwich, IL
Originally Posted by Dustin
So I have never ran my car other than totally stock which ran a 13.56 @ 102mph 2.1 60ft. I ran it last night for the first time modded and it ran 12.54 @ 105mph 1.83 60ft. How the hell did I knock off half a second and only gain 3mph? What am I doing wrong? The car barely spun off the line, barely. Mods are below:
Lid, ported tb, LS6 intake, LTs, X-pipe, Yank 3800
Also I have 2.73 gears.
Lid, ported tb, LS6 intake, LTs, X-pipe, Yank 3800
Also I have 2.73 gears.
I bet a dyno tune right now adds 3-5 mph to your trap and makes launching the car a challenge. It certainly can't hurt anything (other then the check book).
Good luck.
dustin, it appears that your ride needs tuned. i have a lid, ls6 intake, 4k stall, and LTs + x dumped @ axle..i went from 103.5 with a lid and gears to 109 after adding the intake and exhaust.
i'm still untuned, also.
i'm still untuned, also.
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Before my major mods all I had in the car was an SS3600, Drag radials, headers, 2.73 gears and went 12.8 at 106. So your numbers seem correct and when I was stock I ran 13.5 at 103. So a 3 mph gain also.
10 Second Club
Joined: Aug 2005
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From: Tennessee Tech
13.2 @ 106 with lid and LM & 2.73. Your MPH is telling you how much HP your car has. That's why it's mostly consistent. Your tourqe converter just helped you get off the line. Now you need the HP to keep it moving. Get a tune..... Especially with your Long tubes; like most people said you will probably pick up 3-5 MPH.
11 Second Club
Joined: Oct 2005
Posts: 1,847
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From: Sandwich, IL
Originally Posted by Speed Density
Im not confident in getting a mailorder tune and picking up any power.
/hijack.
/hijack.
11 Second Club
Joined: Aug 2005
Posts: 804
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From: Tampa, FL
Originally Posted by Dustin
So I have never ran my car other than totally stock which ran a 13.56 @ 102mph 2.1 60ft. I ran it last night for the first time modded and it ran 12.54 @ 105mph 1.83 60ft. How the hell did I knock off half a second and only gain 3mph? What am I doing wrong? The car barely spun off the line, barely. Mods are below:
Lid, ported tb, LS6 intake, LTs, X-pipe, Yank 3800
Also I have 2.73 gears.
Lid, ported tb, LS6 intake, LTs, X-pipe, Yank 3800
Also I have 2.73 gears.
Plus look at your 60ft 2.1 - 1.83 = .27 tenths
So with the same mph lets say knocking off almost 3 tenths you would have ran a 13.1ish. They say for ever tenth in your 60ft is 2 tenths on the top end. I would say it's a little less than that. Now add another 3 mph to your mph and I could see where the difference went. But I will agree to an extent, running mid 12's at only 105 is not the norm but it shows that it you that your 60ft was a big factor.
-Mark
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Joined: Jan 2004
Posts: 157
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From: Kentucky
Originally Posted by s346k
dustin, it appears that your ride needs tuned. i have a lid, ls6 intake, 4k stall, and LTs + x dumped @ axle..i went from 103.5 with a lid and gears to 109 after adding the intake and exhaust.
i'm still untuned, also.
i'm still untuned, also.
I was trapping 109 and running 13.0 all day with air bellow,lid,catback,Hypertech tune, on street tires with 2.2 60's. Somethings definitly up with those traps.
11 Second Club
Joined: Jan 2004
Posts: 157
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From: Kentucky
Originally Posted by darrensls1
I would never get a mailorder tune. Dynotune by a good LS1 tuner is the only way to go IMO.
As for mail order tunes, I had one done on my TA after I cammed it and took a cam only ls1 ta from a 113 trap speed str8 to a 118 on dr's-120 on street tires. After having PCM for less tune the car I can run 12.0-12.3 on street tires all day with a mild cam and headers.
TUNE
Originally Posted by darrensls1
I would never get a mailorder tune. Dynotune by a good LS1 tuner is the only way to go IMO.
Its an LT1 and There arent any Chassis dynos in town. I dont feel like driving to Oregon to get a tune.
maybe its those 2.4 60ft ive been getting. 
Originally Posted by Dustin
So I have never ran my car other than totally stock which ran a 13.56 @ 102mph 2.1 60ft. I ran it last night for the first time modded and it ran 12.54 @ 105mph 1.83 60ft. How the hell did I knock off half a second and only gain 3mph? What am I doing wrong? The car barely spun off the line, barely. Mods are below:
Lid, ported tb, LS6 intake, LTs, X-pipe, Yank 3800
Also I have 2.73 gears.
Lid, ported tb, LS6 intake, LTs, X-pipe, Yank 3800
Also I have 2.73 gears.
Also, you knocked off a second, not half a second. If you would have gotten a 2.0 60', you could have ran a 13.3.
Originally Posted by kazfan30
Hey buddy, im in the same boat.....Stock was a 13.81 @ 102, now with full boltons, 3600 stall, 3.73's, and even cammed i went 12.90 @ 106. My et does not bother me because i was on shitty sumitomo radials, but 106 F****** sucks. Its not tuned, but i dont see me pickin up that much more MPH. Hell my buddies 01 SS M6 went 109 on just a lid
hahaha...yea look at my sig
