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Old 03-16-2012, 09:10 PM
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1/8 mile guess's

O.K. I'm headed to a car show tomorrow at the local drag strip and was curious as to what kind of time you guy's thought I might run. Just guess's! I have a 69 chevelle full interior 496 dynoed at 642hp/660ft-lb at the flywheel. Turbo 400/3500 stall. 12 bolt rear end with 410 gears--with 275-40-17 nitto drag radials on the rear which will be a slight problem off the line because I need some MT's on the back. Motor specs just because--Compression 10.4:1- Ignition HEI- Holley 850 double pumper- elde air gap- Cam .510 intake 287 degrees .495 exhaust 304 degrees-----320 cc rectangular port Aluminum heads 2.250/1.880. Just curious what you guy's think the car may run! Thanks!

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Old 03-19-2012, 12:07 PM
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My guess 10:90 to 11:05
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Old 03-19-2012, 02:17 PM
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I'd say 11.25 on your best run....
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Old 03-19-2012, 04:36 PM
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Well, I ran the 1/8 mile babying it off the line and dealing with some spinning due to these horrible tires I ran a 7.30. I would like to run a flat 7.0 maybe when I get the D.R's on the back I'll try again. No traction what so ever! Just horrible! Only ran it once!
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Old 03-19-2012, 06:50 PM
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Well, looking at the conversion chart 7.30 in the 1/8 would be close to 11.4 in a quarter, so with some way better traction I hope to get around those numbers. I hope to a little lower time. I should as bad as the traction was!
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Old 03-20-2012, 08:02 AM
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Our typical customer with similar power numbers you state, in GTOs (approximate the Chevelle) run 6.80s and 11.0s-10.80s. The Pontiac does make a little more low-end power, but not much over the 496 (I like that combo). The BBC should make up for it on the "big end".

Jim
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Old 03-20-2012, 11:13 AM
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Those numbers sound good! Ill be happy with a flat 7.0! I think it's possible.
Quote:
Originally Posted by Mr. P-Body
Our typical customer with similar power numbers you state, in GTOs (approximate the Chevelle) run 6.80s and 11.0s-10.80s. The Pontiac does make a little more low-end power, but not much over the 496 (I like that combo). The BBC should make up for it on the "big end".

Jim
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Old 03-20-2012, 07:47 PM
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What was the mph at the end of the 1/8th?
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Old 03-20-2012, 09:09 PM
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I'm sure on ET and Mph
7.36 E.T.
87.40 Mph
Not sure where my wife put the slip, but if memory serves me right the reation time was like .4801 and the 60ft was 1.88 if this helps!
Maybe some of you guy's can better see where I may can improve for a better ET. According to my dyno sheets at the flywheel my highest pull was 642hp at 5,565 Rpm as far as the torque it comes in at 660lbs at 4,262rpm. Of course It's lower at the rear wheel's, but how much I don't know for sure. Not sure if this is going to matter much, but I was shifting at 5,000. I'm planning on putting a rev limiter in, but because of the tires not grabbing very well I wanted a saftey cushion for over Rev. I figured a safe shift point would be 5,500, but I did'nt want to push it to much on it's first run! Like said before I babied it to start and could feel it spinning to the point to where I felt like I had to shift earlier than what I would have thought. Who know's! Any suggestions according to the numbers and info provided. Thanks for the replies guy's!!!!
Quote:
Originally Posted by joelster
What was the mph at the end of the 1/8th?
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Old 03-21-2012, 06:39 PM
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just to give you an idea. i had a 72 chevelle w/a 500 hp 468. it had 4.88 gears 11.5x29.5 slicks and a 3500 converter. it ran 7.20`s. it was all steel but gutted. figure 3100lbs or so. your combo (and i have a ton of eigth mile experience with alot of cars) has the "no slick variable" i would say if it had slicks on it your car would run between 6.80 to 6.90. the biggest determining factor in eigth mile et is the 60`. get your car in the high 1.40 zone and the e`ts will follow.
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Old 03-21-2012, 10:15 PM
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Thanks for the input! This is mainly a street/strip car, but I would like to see the car at its full potential! I plan on getting an extra set of wheels and slicks to pull on and off when I'm going to the strip. I'm gonna try a set of MT Drag radials first! If it's still an issue with the spinning I'll go the slick route!

Quote:
Originally Posted by ballsout1
just to give you an idea. i had a 72 chevelle w/a 500 hp 468. it had 4.88 gears 11.5x29.5 slicks and a 3500 converter. it ran 7.20`s. it was all steel but gutted. figure 3100lbs or so. your combo (and i have a ton of eigth mile experience with alot of cars) has the "no slick variable" i would say if it had slicks on it your car would run between 6.80 to 6.90. the biggest determining factor in eigth mile et is the 60`. get your car in the high 1.40 zone and the e`ts will follow.
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Old 03-22-2012, 06:25 AM
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Quote:
Originally Posted by 396chevelle
I'm sure on ET and Mph
7.36 E.T.
87.40 Mph
Not sure where my wife put the slip, but if memory serves me right the reation time was like .4801 and the 60ft was 1.88 if this helps!
Maybe some of you guy's can better see where I may can improve for a better ET. According to my dyno sheets at the flywheel my highest pull was 642hp at 5,565 Rpm as far as the torque it comes in at 660lbs at 4,262rpm. Of course It's lower at the rear wheel's, but how much I don't know for sure. Not sure if this is going to matter much, but I was shifting at 5,000. I'm planning on putting a rev limiter in, but because of the tires not grabbing very well I wanted a saftey cushion for over Rev. I figured a safe shift point would be 5,500, but I did'nt want to push it to much on it's first run! Like said before I babied it to start and could feel it spinning to the point to where I felt like I had to shift earlier than what I would have thought. Who know's! Any suggestions according to the numbers and info provided. Thanks for the replies guy's!!!!
With a power peak of 5565rpm you should have been shifting above that. I would take it to 5900. It should have a bigger converter in it as well. Something around 4000rpm would do wonders.

First thing you have to do is get yourself some tires. If you need a tire that you can drive on the street and strip go with a Hoosier Quick Time Pro. Something like a 27x11.50x15 will fit real nice on a 15x8 rim. That's what I run and have done some low 1.4 60-foots. I get an honest 3000 miles out them too, even running with a spool, and at least 10 track outtings. Basically 1 full season.
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Old 03-22-2012, 09:41 PM
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Quote:
Originally Posted by joelster
With a power peak of 5565rpm you should have been shifting above that. I would take it to 5900. It should have a bigger converter in it as well. Something around 4000rpm would do wonders.

First thing you have to do is get yourself some tires. If you need a tire that you can drive on the street and strip go with a Hoosier Quick Time Pro. Something like a 27x11.50x15 will fit real nice on a 15x8 rim. That's what I run and have done some low 1.4 60-foots. I get an honest 3000 miles out them too, even running with a spool, and at least 10 track outtings. Basically 1 full season.
I looked at the Hoosier Quick Time, but they only go up to a 16" wheel. I need to go with a 17" on the drag radials. Now on the slicks I'll go wit a 15" because Ill be buying a pair for the slicks, but before hitting the pockets to deep Id like to try a drag radial that will fit my wheels first. If they do pretty good then Ill have the best of both without having to have a set laying around. They have a set of 27x11.5x17 in the MT ET's any idea if that wide of a tire will fit under the 69 chevelle? Not sure if this helps, but my wheels have a +7mm Offset, 5.25" Backspace 17x9

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Old 03-23-2012, 12:20 AM
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The Mt ET street is measured differently than the slick a 27 x 11.5 x 17 in a bis ply tire will be 10" wide .

I have been trying to get the best of both worlds with the drag radial also . It is hard to do . Drag radials are hit and miss until you figure them out . A seperate set of rims with slicks or ET street bias/ QT pro would be more consistant .
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Old 04-01-2012, 10:34 AM
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Quote:
Originally Posted by 396chevelle
I looked at the Hoosier Quick Time, but they only go up to a 16" wheel. I need to go with a 17" on the drag radials. Now on the slicks I'll go wit a 15" because Ill be buying a pair for the slicks, but before hitting the pockets to deep Id like to try a drag radial that will fit my wheels first. If they do pretty good then Ill have the best of both without having to have a set laying around. They have a set of 27x11.5x17 in the MT ET's any idea if that wide of a tire will fit under the 69 chevelle? Not sure if this helps, but my wheels have a +7mm Offset, 5.25" Backspace 17x9
I'm not sure if they will fit, but getting a 17" tire to hookup will not be easy. Running a tire like that with a stiff sidewall will be a challenge. You will want to have a good set of double adjustable shocks in back, a real good anti-sway bar, and some adjustable suspension components to change the pinion angle and instant center. With a 15" tire will a bigger/softer sidewall, it will be much more forgiving.
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