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What should this run-1/4 Mile Estimate/Guess??

 
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jtm60
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Joined: 10 Oct 2005
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PostPosted: Mon Oct 10, 2005 2:06 pm    Post subject: What should this run-1/4 Mile Estimate/Guess?? Reply with quote

Can you guys give me some estimates on this??

69 Chevelle SS396..396 dyno'd @ 425hp/440 ft lbs peak. M20 4 speed. 3.38:1 rear.

14" ss wheels with BFG's, 26.5" tall. 3800lbs(?)..

Might also be trying drag radials on 15"'s, these would be 26.1" tall.

Track is at sea level and has decent traction on a good night...
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jonny_b
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Joined: 28 May 2003
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Location: Rogers, MN
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1979 Chevrolet Camaro

PostPosted: Mon Oct 10, 2005 2:26 pm    Post subject: Reply with quote

I'll put my estimate in at...13.9sec @ 96mph with drag radials

Probably 14.5sec @ 90mph with street tires

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ABIGBRAIN
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Joined: 22 Jun 2003
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Location: Upstate New York
2781.08 points


1968 Chevrolet Chevelle

PostPosted: Mon Oct 10, 2005 2:49 pm    Post subject: Reply with quote

If the #'s you provided were from a chassis dyno, here is your best case scenario:

7.57 1/8th ET
11.79 1/4 ET @112.82
crossing the line at 4850 RPM's


If the #'s are from an engine dyno ( or guess from the builder), here is the best case scenario:

7.96 1/8th ET
12.40 1/4 ET @ 106.95
crossing the line at 4600 RPM's


Your times will be somewhat slower than what I have provided. When you take into account the atomospheric conditions, track prep, wheel spin (street tires)...... etc

I hope this helps.
-Andy-

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1968 Chevelle - 10.47@126 MPH 1.43 60' 383 SBC NA, Original rear suspension. 149,000 + miles



Last edited by ABIGBRAIN on Tue Oct 11, 2005 2:07 am; edited 1 time in total
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jtm60
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PostPosted: Mon Oct 10, 2005 3:03 pm    Post subject: Reply with quote

Thanks Andy..Nice Lookin' velle you got there!

The numbers I gave were from the builder's superflo dyno..

I am hoping to get into the 12's, and I figure that traction is going to be an issue. I am certain to see some 13's and 14's I would think, until I can get consistent.

I just wanted to see whether or not anyone thought my combo would be good enough as is for 12's..seems its got the power to do it. Its actually no longer a 396, its a 408, performer rpm manifold, lunati cam, roller rockers..so its been breathed on a bit, but trying to maintain a stock look.

Thanks to all for your responses, keep em coming!
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ABIGBRAIN
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Joined: 22 Jun 2003
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1968 Chevrolet Chevelle

PostPosted: Mon Oct 10, 2005 3:14 pm    Post subject: Reply with quote

get a set of slicks or drag radials (no wider than 10.5) and buy an air bag for the right rear coil spring to help with the torsional power twist that will happen when it finally HOOKS!! 8-10 lbs in the bag is what we use.

hope it helps
-Andy-

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Baseball is wrong, a man with 4 balls CAN NOT WALK !!

1968 Chevelle - 10.47@126 MPH 1.43 60' 383 SBC NA, Original rear suspension. 149,000 + miles

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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Mon Oct 10, 2005 3:32 pm    Post subject: Reply with quote

My guess is 12.6 @ 108 once you get everything sorted out.
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jtm60
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PostPosted: Mon Oct 10, 2005 8:09 pm    Post subject: Reply with quote

Cool...looks like I may at least have a shot at a 12 if I can get it hooked..I may be looking into some no hop bars, as i have some occasional wheel hop on the street. The air bag sounds like a good idea too.

I imagine I am going to have to baby it out of the hole a bit, especially if I am just going to try a few runs on street tires the first time around.

thanks for the advice..
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85GMCstreetbeast
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1985 Chevrolet GMC

PostPosted: Mon Oct 10, 2005 10:01 pm    Post subject: Reply with quote

Got any pics of this Beast? Gettin your lanuch right will determine your times better then anything else. Im around the same weight with less power an i cant hook for anything using even 1000'rpms of stall. Once you get her to hook up youll be turning some hella good times. Good luck man keep us updated if ya would!
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jtm60
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PostPosted: Mon Oct 10, 2005 10:52 pm    Post subject: Reply with quote

this is about the best i have at the moment..i need to take some new pics..



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HotRodDaddy
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1994 Eagle Talon

PostPosted: Tue Oct 11, 2005 1:25 am    Post subject: Reply with quote

thats one beautiful car man cant wait to hear how it does at the track. get some slicks just to help with traction.
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jtm60
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PostPosted: Tue Oct 11, 2005 8:47 am    Post subject: Reply with quote

thanks!

yeah, i gotta get prepared for the track, otherwise i will just get frustrated I think..

i am probably going to get a cheap set of 15" ralley wheels or something and try some drag radials, so i can drive it to the track. in a perfect world i would have a trailer or something..really would suck to break something and not be able to get home.

it has to be done though, at least to see where it gets, car is pretty fast and fun to drive on the street. its always a blast to go to street night and see what happens, im looking forward to it.
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Paul P
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Location: Townsend, Mass.
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1971 Chevrolet Chevelle

PostPosted: Wed Oct 12, 2005 9:49 am    Post subject: Reply with quote

Nice looking car! The car might need a driveshaft loop to pass tech does it have one? If it doesn't and it lets go that would suck. I know you might not want to put one in a car like that but it might be a good idea. Big Blocks and 4 Speeds break stuff. But they are a lot fun. I agree with the guy's that already posted that mid to upper 12's is definitely the range for that car. Get it on the track and let it loose and have a great time doing it....
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jtm60
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PostPosted: Wed Oct 12, 2005 11:48 am    Post subject: Reply with quote

Thanks again for the compliment..It does not have a driveshaft loop, as I am trying to keep it as stock looking as possible for car show purposes. It would probably be fun to run it in a pure stock or FAST class at some point, but for right now it is strictly street driven, and as stated I would like to take it to street night to see what it does.

I might be able to get away without the loop...my exhaust has an H crossover that kinda acts like a driveshaft loop! I wouldnt mind putting on some of those edelbrock no-hop bars, since they can't be seen without really looking for them. Can you tell I want a sleeper SS, if there is such a thing!? 396/350HP on the air cleaner and semi-quiet exhaust to hide some of the cam lump seems to have some people fooled already Smile

I am glad to hear you guys think a 12 would be possible...one of my buddies keeps harping on me to change the rear to 3.73 or 4.11...but with the M20 (well its acutally an Autogear M22W wide ratio), 1st gear gets it out of the hole pretty good, and its driveable with the 3.38 rear in 4th gear..can actually cruise pretty comfortably at 50-65 mph. I think going to a lower rear gear will just result in more traction problems and tire smoke.
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