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#1054959 - 12/23/17 02:52 PM How fast is my car?  
Joined: Mar 2014
Posts: 301
s10mike Offline
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s10mike  Offline
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Joined: Mar 2014
Posts: 301
herminie, pa
Hey guys,
I have a sort of speculative question. How fast would my car run in the 1/4 mile on a good set of tires? I'm making 400hp/400tq to the tires, with an automatic and 3.73 gears.


86 monte carlo ss
6.0 ls/4l80e dana 60
#1054963 - 12/23/17 09:27 PM Re: How fast is my car? [Re: s10mike]  
Joined: Jun 2006
Posts: 1,508
thepezking639 Offline
10+ Year
thepezking639  Offline
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Joined: Jun 2006
Posts: 1,508
Livonia, MI
What tire/ rear suspension combo you got going on.

Lots of power to put down. What cam intake etc on your 6.0? SBE?

I'd say you're deep into the 12's

I've got an LQ4 with an LS3 cam and I ran 13.24 @ 107 on some 245 street tires, non functioning Posi and poopy 60 foot.

Last edited by thepezking639; 12/23/17 09:27 PM.

86 SS 6.0L LQ4, TBSS GEN IV intake, 92mm TB, 30lb injectors, LS3 cam and valvesprings, stainless long tube headers, Microsquirt ECU, Built 200-4R, B&M Megashifter, Torsen LSD, QA1 Lvl 3 Suspension Kit, UMI Front & Rear Braces. Check out my build thread: http://www.pro-touring.com/threads/126188-SSLOW6-0-Build
#1054971 - 12/24/17 01:57 AM Re: How fast is my car? [Re: s10mike]  
Joined: Nov 2007
Posts: 5,115
Onebadbowtie86 Offline
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Onebadbowtie86  Offline
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Posts: 5,115
Traverse City Michigan
depends how loose of a converter you have, what the car weighs and what kind of traction you are going to get. If you get good traction and 60 foot id say high 11's.



'86 Monte carlo ss-Frame off resto-mod.
Ls2/t56/8.5"
#1054975 - 12/24/17 12:50 PM Re: How fast is my car? [Re: thepezking639]  
Joined: Mar 2014
Posts: 301
s10mike Offline
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s10mike  Offline
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Joined: Mar 2014
Posts: 301
herminie, pa
Originally Posted by thepezking639
What tire/ rear suspension combo you got going on.

Lots of power to put down. What cam intake etc on your 6.0? SBE?

I'd say you're deep into the 12's

I've got an LQ4 with an LS3 cam and I ran 13.24 @ 107 on some 245 street tires, non functioning Posi and poopy 60 foot.


My suspension is pretty much stock with the exception of UMI upper and lower control arms in the rear along with a 1" umi sway bar. And I have a set of Mickey Thompson ET street drag radials, 255-60r15s. Detroit tru-Trac posi.

My cam is a texas speed 228r. 228/228 @ 50, .581/.581 lift. I have an old Fast 78 intake and texas speed cathedral port heads.


86 monte carlo ss
6.0 ls/4l80e dana 60
#1054976 - 12/24/17 12:51 PM Re: How fast is my car? [Re: Onebadbowtie86]  
Joined: Mar 2014
Posts: 301
s10mike Offline
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s10mike  Offline
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Joined: Mar 2014
Posts: 301
herminie, pa
Originally Posted by Onebadbowtie86
depends how loose of a converter you have, what the car weighs and what kind of traction you are going to get. If you get good traction and 60 foot id say high 11's.


I don't know what exactly my car weighs, but my converter has a 3000rpm advertised stall speed.


86 monte carlo ss
6.0 ls/4l80e dana 60
#1054977 - 12/24/17 02:34 PM Re: How fast is my car? [Re: s10mike]  
Joined: Jan 2000
Posts: 3,919
mmc427ss Offline
15+ Year
mmc427ss  Offline
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Joined: Jan 2000
Posts: 3,919
Pottstown, Pa
Mike, if you could get your 60's into the 1.7s with those tire I would expect mid to high 11s at about 117. Getting the car out and into 2nd gear is the key to good times. ET is about traction and hp, your mph through the traps is relative to hp and weight. Trap speed is a good indicator of hp.
Wallace Racing has some good, pretty accurate, calculators to play with.
http://www.wallaceracing.com/Calculators.htm

One of the problems with calculators is plugging in the hp. Flywheel and wheel hp are not the same, some calculators don't define which to use.

Also drivetrain hp consumption is a big factor to consider. A 4l80 is similar to a TH400, they both need a lot of hp to turn them. A friend is in the process of removing his TH400 and installing a TH350, expecting the car to be 2 tenths quicker. That 69 Camaro street car runs high 11s, low 12s at 112 with an old school 327, with good parts.

Get your car scaled sometime. You may be able to find a local drive on scale, here we have a scale used by the local grain supplier to weigh trucks. It was pretty accurate and check often by the state. Had my car weighed on that scale and the next day weighed on a 4 corner race scale, the difference was 15 pounds. My car is fat 3625. Also if you get to a track they will have a drive on scale, this will give you car and driver weight. The LS saves weight, the trans and rear you run adds weight compared to stock. You could be in the 3500 range less driver.
Bob


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