lewtot184
Well-Known Member
i like those new FBO's with the rev limiter. very good bang for the buck.
6 pack guru's please help
- Thread starter polywideblock
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Yep. Don was helpful and did a good job setting up the dizzy for an out of the box great starting point. I want to play with the advance curve some, as well as initial and total timing, but that takes time and preferably a chassis dyno or test and tune day at the track. I plan on using a chassis dyno to see how my A/F ratio looks at idle AND throughout the RPM range doing a simulated 1/4 mile run, so maybe I can bring some springs/weights with me for a quick swap to see what that does.
The rev limiter really gave me the confidence to power shift every run I made at the annual track day a couple of weeks ago, and I am sure that not lifting really contributed to the 6/10ths improvement over the previous year.
The rev limiter really gave me the confidence to power shift every run I made at the annual track day a couple of weeks ago, and I am sure that not lifting really contributed to the 6/10ths improvement over the previous year.
Garys1969RR
Well-Known Member
As stated earlier, I get a slight hesitation when the end carbs open. I am using the stock yellow springs, and I really don't mind it. It's only a 1/4 second hesitation, if that. That's prob why they recommend the heavier spring, to slow the opening rate. But as lewt just pointed out, with a black spring the secondary carbs may never open fully, and you will see a reduction in performance.
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lewtot184
Well-Known Member
from my experience the hesitation from a roll with yellow springs diminishes when taking off from a standing start. i'd suggest trying purple springs for a better feel from a roll. plain springs will eliminate the hesitation but add about 2 tenths to the e.t. cold intakes (heat blocked) will have a more pronounced feel/hesitation than intakes with full heat. i try to manage the heat by modifying the intake or drilling a couple of 1/2" holes in the block offs of the intake gasket.
66Satellite47
Well-Known Member
My experience indicates adjustment of the end carb idle screws would cure that. Trying different vacumn springs is also something to try. I got great results from adjusting the end carb idle screws.
Garys1969RR
Well-Known Member
Come to think about it, there is no hesitation coming off the line. Only when flooring the throttle from a roll. Maybe I should try opening the end carbs idle mixture screws a 1/4 turn.
66Satellite47
Well-Known Member
Try the end carb idle screws. A 1/4 turn will make a lot of difference. It was a nite & day difference with my setup. Just try it.
lewtot184
Well-Known Member
i also toss the .031" squirter in the center carb. i use a .025" with tubes and a white 218 cam on the #1 position.
68 HEMI GTS
Well-Known Member
Ive had different experiences with the springs. Every combo is different and needs tuning as such. I start out stiff and walk them down till I get a bog in high gear from a roll. I'll usually go back up one color from there. I've ran black springs in my carbs and went mid 11's on a 440 (lighter did not work) Same carbs on a 511 like the lightest springs I could find and the car runs high 10's. it's trial and error, there is no set recipe. You gotta play. And yes, sometimes a small bog on the street may be covered up at the track from a dig. Once again is trial and error.
so use the six pack tuning info I already have but substitute yellow or purple springs for the black one recommended . and I don't need the idle solenoid 
lewtot184
Well-Known Member
if it's the moparts tuning toss it. never run blacks unless the kill bleeds are blocked.so use the six pack tuning info I already have but substitute yellow or purple springs for the black one recommended . and I don't need the idle solenoid
66Satellite47
Well-Known Member
You need to just try the different springs to see what works best with your setup. The squirter size doesn't seem to vary much. Stock or a couple sizes bigger with the aluminum manifold I ran.
440fish
Well-Known Member
Agree with you need to experiment. The yellow / purple and black springs sucked on my 493 stroker. Fell on its face when i nailed it. Stiffer springs were in order. A/F meter confirmed the lean condition.
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68 HEMI GTS
Well-Known Member
I've ran blacks with open kill bleeds. They were right for that particular combo. Once again I'll say every combo is different and needs to be tuned as such. Never say never. If nothing else the black springs are a good starting spot to get the center carb dialed, then lighten em up to you find what works for your combo. Not hard, and certainly not rocket science. If nothing else atleast you won't be starting with a bog. From there you'll feel the changes your making. I would never install any springs and call it good, if you don't try different combos your leaving power in the table.
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I go along with "68 Hemi", never ran "triples" myself but always liked Holley's for ease of tuning with the acc.pump cams,etc. Everything is always different; just have to try everything.
66Satellite47
Well-Known Member
It takes trying different parts. Six Paks work differently on different cars. You need to try things springs, squirters to see what works. The end carb idle screws are a major issue. In stock position you be sure to have a boog. 1/4 turn makes all the difference in the world.
roadrunner69440
Well-Known Member
Great read !!!
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