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Old 06-03-2014, 11:19 AM
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Liking my Powerband

My dyno runs from this weekend. This is from my 96 C1500 Shorty with a 388 and TH350.


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Old 06-04-2014, 10:13 AM
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Carb or stock CSFI intake manifold?

Nice numbers.

peace
Hog
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Old 06-04-2014, 04:39 PM
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RPM Airgap manifold and a reworked QFT 680 VAC carb.

Am currently playing with a Super Sucker spacer, but won't have another dyno until next year.
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Old 06-10-2014, 05:07 PM
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. What's your theories on waviness in curves from 3700-4500 RPMs and flat HP curve from there till 5000? Secondaries opening to soon? Lean secondaries? Exhaust manifolds/header length?
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Old 06-10-2014, 09:38 PM
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I'm not certain. I'm going to purchase a wideband A/F ratio meter soon and begin tuning with that. Problem is I won't have dyno access until next June.

Throttle response is excellent and there are no stumbles of any kind when hammering the throttle. If I had to guess, it would be slightly lean at that PM range.
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Old 06-10-2014, 10:06 PM
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two back to back runs with out changes? or were all the tuning steps done before these last 2 runs?
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Old 06-11-2014, 06:47 AM
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two back to back runs with out changes? or were all the tuning steps done before these last 2 runs?

I play and tune throughout the year, and when our Krusin Klassics Fun Run rolls around we get a portable chassis dyno from X&M Hot Rods. I make two pulls back to back. The first run is usually the strongest run, but this year was a bit different. Also, I fattened up the primaries this year and gained 50 LB/FT over last year's run. Last year a I ran 379 HP and 397 LB/FT of torque. I just installed a 1" super sucker and will have to wait til next year to test it.
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Old 06-11-2014, 01:01 PM
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. Single plane intakes, cutting down the divider, and open spacers usually require richening the secondaries... sounds like richening the primaries made a whale of a difference...!

. I'm also in the market for a wideband A/F meter... and also a real time MPG/fuel flow computer... have like 8 vehicles to tinker on...
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Old 06-12-2014, 03:34 PM
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. Single plane intakes, cutting down the divider, and open spacers usually require richening the secondaries... sounds like richening the primaries made a whale of a difference...!

. I'm also in the market for a wideband A/F meter... and also a real time MPG/fuel flow computer... have like 8 vehicles to tinker on...

This HVH Super Sucker is advising to lean the carb at least 1 jet size squarely. Possibly two sizes depending on set up. It's says the velocity is increased so much that it pulls more fuel.
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Old 06-14-2014, 01:53 PM
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. Have to try it with and without the Super Sucker once you get the jetting right for each scenario...
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Old 06-14-2014, 03:41 PM
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. Have to try it with and without the Super Sucker once you get the jetting right for each scenario...
That's what I planned on. We get the dyno for two days so I can pull on Friday, make some changes and pull on Saturday. We did have a guy test one this year on a very stout 421 sbc. According to his dyno runs he gained nearly 60hp and 44lb/ft of torque. He was using it on an single plane manifold with a 950 carb, tho. The tech guys at HVH did tell me that the less efficient your intake is the better the super sucker works. So my results are to be dependent on the efficiency of an RPM Air Gap. I've already got the spacer installed and the jetting down one size squared. Throttle response IS a bit better and more sensitive, but we'll have to wait for the numbers to see what it actually is doing.
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Old 06-16-2014, 08:42 AM
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. A spacer increases the plenum size on a single plane intake on a big cammed engine, so would be expected to increase HP and possibly even torque peaks... of course, on a street engine, need to look at the whole power curve including part throttle...
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Old 06-16-2014, 09:39 AM
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This is no ordinary spacer, tho. It is machined so it blends from a 4 hole into an open space with angles that smoothly transition from the carb to the intake.
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Old 06-16-2014, 10:12 AM
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ported spacers

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This is no ordinary spacer, tho. It is machined so it blends from a 4 hole into an open space with angles that smoothly transition from the carb to the intake.
hand ported spacers have been around quite awhile,now you just buy them. We saw 15/100 on a drag car(street 355 67 Camaro) after a dyno day.
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Old 06-16-2014, 10:45 AM
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hand ported spacers have been around quite awhile,now you just buy them. We saw 15/100 on a drag car(street 355 67 Camaro) after a dyno day.
I'm anxious to see if mine makes a difference, but as I said, I won't see a dyno til next May. But, as it stands, it does run clean and the throttle is nice and crisp.
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