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Author
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Topic: Gonna try some new setups
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bluestreek
Gearhead Posts: 607
From: Athens,GA
Registered: Jul 2001
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posted 07-18-2001 10:11 PM
   
Here are some ideas that I'm gonna try out on my '66 289 coupe.1.) I have decided to use 26" X 15 street tires this weekend and try to run the 1/4 mi. in 3rd gear with my 3.50 rear gears.. My previous best e.t. & mph was 13.8 @ 100 with 24"x14 street radials, but I was shifting into 4th before the finish.. I think I should be able to improve this a little if I can run it all in 3rd instead of having to shift into 4th at the end... 2.) I bought a Holley 0-80507 390 CFM HP carb from an auction last night "for a song" and will be trying it out once I get my best baseline with my current setup.. I've been dying to see what one of these little racing carbs will do to a moderate 289 CI.. If I don't like it, I should be able to find someone that wants a $600 HP racing carb.. 3.) I also bought a 4.44 gear and spool for $100 and plan on building an open 9" diff. with a spool installed as my 3rd approach.. (This should make a good improvement in E.T., but will only be used racing purposes) After all this, then I might get a set of sticky tires!!  I'll keep you guys posted of my progress..
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steve'66
Gearhead Posts: 3653
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 07-19-2001 01:29 PM
Bluestreek,I like number 3, should work out well at your trap speed. #1 won't make much difference in et. The time you loose shifting at the big end isn't much because you're going 90+mph. #2 390cfm seems kinda small for a 289. SteveW
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chips67
Gearhead Posts: 537
From: louisville, ky, usa
Registered: Jul 2001
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posted 07-19-2001 05:33 PM
agree with steve on that one. a 600cfm would go nice on a 289 and you could get one for a song if you dont mind rebuilding.
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bluestreek
Gearhead Posts: 607
From: Athens,GA
Registered: Jul 2001
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posted 07-19-2001 09:20 PM
I guess we'll just have to see about all this, cause Ima gonna try each setup, one at a time just to see who's right...  Happy motoring!
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clevelandstyle
Gearhead Posts: 178
From: Connersville, IN
Registered: Jul 2001
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posted 07-19-2001 11:58 PM
My guess is that the taller tires will hurt your ET. That's assuming that traction is the same. Just a guess!
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bluestreek
Gearhead Posts: 607
From: Athens,GA
Registered: Jul 2001
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posted 07-21-2001 02:28 PM
Well, It seems that everyone was correct about the #1 setup.. My ETs fell off by .1 because of poor 60' times, and the mph went up only by 2... My first run I really srcwed up bad off the line with a 3.2 60' and a red light ..ha! ha!  .. But the funny thing was, I ran a faster car(brother-in-laws chevy running 13.7 and 1.8 60") that come out of the whole and blew by me like I was sitting still!! I took the little 289 with ported stock 2brrl heads started pushing her to the limit.. I actually managed to go around him by 1000 ft.. and blowed him away by 3-4 car lengths at the end.. This was the highlight of the whole night..On to the next setup!!
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bluestreek
Gearhead Posts: 607
From: Athens,GA
Registered: Jul 2001
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posted 07-28-2001 12:40 AM
I finally got around to rebuilding the Holley 390 CFM racing doublepumper(no choke horn or vac. ports).. It has # 62 jets front and back, # 25 squirters f&b, 6.5 PV f&b, with 30/70 progressive linkage... The #62 jets seem a little big for this carb, but I left them alone for now.. Anyway,... After installing it in place of the 600 vac., it fired up with an awesome rumble !!!(those darn roundy round cars idle high!!) I backed down and set the idles and lowered the rear float and she settled down to a nice clean rumpity-rump ..
I drove it around the block to make sure gaskets,floats, and linkage was ok.. Man, you would not believe how responsive this little jewel is!!! The torque from 1500-3000 rpms is definately better than any 600 or 650 that I've used ... It gives enough power to light up both tires at 40MPH in 2nd gear!! Every little movement of the throttle gave instant response and you absolutely cannot feel when the mechanical secondaries come in .. It is really sweet!! I'll be trying it out at the 1/4 track very soon to see if it has the guts to keep up with the 600 CFM on the top end (6200 rpm)..
I think 2 of these babies on a tunnel ram would be perfect for a 400+ HP SB engine..Later,
Dan
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Doc
Gearhead Posts: 466
From: Redwood City, Ca. USA
Registered: Jan 2001
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posted 07-28-2001 04:07 AM
Butcher built a fairly stout 289 some time back with 2 390s on a ram and had it in a Pinto, little thing was strong, short and fun .
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