Been a While - Chevelle Tech
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post #1 of 20 (permalink) Old Jan 13th, 18, 9:29 PM Thread Starter
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Dan
 
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Been a While

Since I made an inch of progress but it finally came. I went out on thursday night to the not defunct Irwindale and made a couple passes. Over the past couple months I've been stuck in the 6.0's and it's been aggravating to say the least. I had made a gear change from 3.73's to 4.11's and it basically netted the same results in both ET and speed. I thought that was interesting to see.
The weather went cold (for here) so I switched from the PBR to a stiffwall 20x10.5 slick for better consistency knowing it would slow the car down some.
With the 3.73's and the 3355 pbr the car went 1.31 60' at 6.01 114mph.
Thursday with the slicks I managed 2 passes, one at [email protected] and the second pass was [email protected] lifting a little earlier than I should have, maybe 20' early according to a friend who was watching at the stripe. Of course the goal is the magic 5's but for me it is elusive. Another difference was that I removed 60lbs of exhaust system and replaced it with a pair of Vibrant 5" so
called mufflers. The air was cool, in the mid 60* and the baro was good for here except for the 83% humidity when I ran. Shock setting proved to be of great value even if I have the Viking originals.
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'66 SS Chevelle
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first day out
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post #2 of 20 (permalink) Old Jan 13th, 18, 11:48 PM
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Vince
 
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Re: Been a While

wow you are so close to the fives
wallace calc. shows it would be about a 9.51/142mph
congrat's
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post #3 of 20 (permalink) Old Jan 14th, 18, 12:44 AM Thread Starter
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Dan
 
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Re: Been a While

Quote:
Originally Posted by VinceS427bb View Post
wow you are so close to the fives
wallace calc. shows it would be about a 9.51/142mph
congrat's
Thanks,
I don't put too much stock in the calculators because not all cars that run a given number in the eighth will translate a precise number into the 1/4.
Here's another example...
1/4 Mile to 1/8 Mile Conversion Chart - NSS Racing Forums

'66 SS Chevelle
91 octane special
first day out
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post #4 of 20 (permalink) Old Jan 14th, 18, 12:53 AM
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Anthony
 
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Re: Been a While

Hey Dan - sounds like a new best for the 66! Not too bad for a little cylinder head =) Do you know the full weight of the car with you in the driver's seat?
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post #5 of 20 (permalink) Old Jan 14th, 18, 1:31 AM Thread Starter
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Dan
 
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Re: Been a While

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Originally Posted by Ants68 View Post
Hey Dan - sounds like a new best for the 66! Not too bad for a little cylinder head =) Do you know the full weight of the car with you in the driver's seat?
It is 3750 now with me. I was running 3/4 tank of gas which may be a little more weight as it was weighed with a half tank. (10 gallons) I took the full (60lb) exhaust off and replaced it with lighter mufflers which I give maybe 8 or 9 lbs including the heavy ass 4 bolt collector flanges. Yes, a little head goes a long way...
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post #6 of 20 (permalink) Old Jan 14th, 18, 8:32 AM
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Jarad
 
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Re: Been a While

It will happen Dan, you only need a few numbers. Could you pull the muffler off and just run an extension? What about light weight gear oil or pulling the alternator during runs, up the front tire pressure? Take some weight out temporarily. Vaccuum pump... Would like to see that car get in the 5's.

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post #7 of 20 (permalink) Old Jan 14th, 18, 12:52 PM Thread Starter
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Dan
 
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Re: Been a While

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Originally Posted by JBoggs View Post
It will happen Dan, you only need a few numbers. Could you pull the muffler off and just run an extension? What about light weight gear oil or pulling the alternator during runs, up the front tire pressure? Take some weight out temporarily. Vaccuum pump... Would like to see that car get in the 5's.

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Thanks, I think it can happen without pulling stuff off the car. It's just a matter of tuning and shock adjustment. I'm leaving at 3250 at present.

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post #8 of 20 (permalink) Old Jan 14th, 18, 1:04 PM
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Re: Been a While

Nice to be running in January. I agree it will run a 5 just the way it is.
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post #9 of 20 (permalink) Old Jan 14th, 18, 1:30 PM Thread Starter
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Dan
 
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Re: Been a While

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Originally Posted by 72BBMonte View Post
Nice to be running in January. I agree it will run a 5 just the way it is.
Jon, the weather is the ONLY thing decent about California. Period....
I may see what raising the launch rpm will net. I can also play with the launch reatrd a bit, then there's jetting, then there's blah blah blah. It's all a balancing act of sorts. For you and myself, dumping weight would be an asset however I'm trying to do this on a 10" tire which is ok for a couple reasons but as you know, this stuff is an addiction. I bet it's ccccccold back in Iowa. What's the winter build?
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post #10 of 20 (permalink) Old Jan 14th, 18, 1:37 PM
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Re: Been a While

Sooooo close! I know the feeling...those last few zeros are elusive little suckers!

But you'll get there with what you have.


JIM
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post #11 of 20 (permalink) Old Jan 14th, 18, 2:41 PM
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Jarad
 
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Re: Been a While

Quote:
Originally Posted by Stokerboats View Post
Thanks, I think it can happen without pulling stuff off the car. It's just a matter of tuning and shock adjustment. I'm leaving at 3250 at present.
I know with mine it likes a little more RPM on the 2-Step, although mine is a glide. That heavy car is moving.

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post #12 of 20 (permalink) Old Jan 14th, 18, 3:08 PM
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Cool You're Doing Great!

Quote:
Originally Posted by 540Hotrod View Post

Sooooo close!

You'll get there with what you have.

That's a definite eventuality...but I/you know you will not rest
until you're safely beyond the bubble & permanently in the 5s.

And this too will be done...
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post #13 of 20 (permalink) Old Jan 14th, 18, 5:50 PM Thread Starter
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Re: Been a While

Quote:
Originally Posted by 540Hotrod View Post
Sooooo close! I know the feeling...those last few zeros are elusive little suckers!

But you'll get there with what you have.


JIM
Yeah but your zeros have 2 in front of them
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post #14 of 20 (permalink) Old Jan 14th, 18, 10:28 PM
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JIM
 
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Re: Been a While

Quote:
Originally Posted by Stokerboats View Post
Yeah but your zeros have 2 in front of them
LOL.....just barely...but if it had said 199 I'd have run over the crank to get there!


JIM
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post #15 of 20 (permalink) Old Jan 15th, 18, 7:19 AM
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Chris
 
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Re: Been a While

Quote:
Originally Posted by Stokerboats View Post
Thanks,
I don't put too much stock in the calculators because not all cars that run a given number in the eighth will translate a precise number into the 1/4.
Here's another example...
1/4 Mile to 1/8 Mile Conversion Chart - NSS Racing Forums
Almost right on the money for me!

73 nova,3515#(all steel)Pump gas!(91octane)406ci N/A, best 1/4,1.45 '60,[email protected],10.6 @ 122.38, short shifting,NO tuning!


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