Tested Holley Hi-Ram LS3 intake vs Stock LS3, 45 rwhp gain on stock LS3 heads
11-21-2011, 04:27 PM
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Tested Holley Hi-Ram LS3 intake vs Stock LS3, 45 rwhp gain on stock LS3 heads We have been very happy with these Holley Hi-Ram intake manifolds so far in our testing.
Vehicle/Combo:
1962 Nova LSx conversion -
408" Stroker, Stock LS3 cylinder heads, 11.25:1 compression
247/259, .624/.624 @ 114 LSA LSL/LSR lobe camshaft
CalSpeed custom built 2" Primary headers /w 3.5" Collectors, open headers
Powerglide /w 5600 rpmm stall 8" converter (Goes 5200 on transbrake with both intakes)
Tubbed 9" Rear-end /w 33" x 14" slicks
Tested with factory LS3 Intake manifold /w Edelbrock 90mm throttle body
Peak power @ 6000 rpm - 460 rwhp (Power fell to 420 rwhp by 6800 rpm and much worse above that on other pulls)
Swapped to Holley Hi-Ram intake with same throttle body 90mm
Peak power @ 6300 rpm - 480 rwhp BUT held powerband to 465 rwhp @ 6800
Right at 45 rwhp more at 6800 rpm and we plan to shift the car 6800-7000 at the track so hoping for 3-4 tenths at the track vs LS3 intake.
We are going to be testing again on the same comparison / combination with a set of Stg 3 CNC WCCH heads in a GTO /w lockup 4l60e trans next month. Results will be posted when available.
Dyno sheet:
Vehicle/Combo:
1962 Nova LSx conversion -
408" Stroker, Stock LS3 cylinder heads, 11.25:1 compression
247/259, .624/.624 @ 114 LSA LSL/LSR lobe camshaft
CalSpeed custom built 2" Primary headers /w 3.5" Collectors, open headers
Powerglide /w 5600 rpmm stall 8" converter (Goes 5200 on transbrake with both intakes)
Tubbed 9" Rear-end /w 33" x 14" slicks
Tested with factory LS3 Intake manifold /w Edelbrock 90mm throttle body
Peak power @ 6000 rpm - 460 rwhp (Power fell to 420 rwhp by 6800 rpm and much worse above that on other pulls)
Swapped to Holley Hi-Ram intake with same throttle body 90mm
Peak power @ 6300 rpm - 480 rwhp BUT held powerband to 465 rwhp @ 6800
Right at 45 rwhp more at 6800 rpm and we plan to shift the car 6800-7000 at the track so hoping for 3-4 tenths at the track vs LS3 intake.
We are going to be testing again on the same comparison / combination with a set of Stg 3 CNC WCCH heads in a GTO /w lockup 4l60e trans next month. Results will be posted when available.
Dyno sheet:
Last edited by CalSpeedPerformance; 11-21-2011 at 07:22 PM.
11-21-2011, 04:37 PM
#3
Cool test, Jim! Did you make any pulls that show the low RPM stuff (under 5K rpm)? I'd be eager to see those number as much or more than those peak numbers!
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Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
11-21-2011, 07:22 PM
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Car flashes to what you see in the graph (non-lockup 5600 stall on the transbrake), no way of making pulls at lower RPM etc.
Next car we test on, we will lock converter and pull from about 2500 rpm up.
Next car we test on, we will lock converter and pull from about 2500 rpm up.
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11-22-2011, 08:42 PM
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To anyone asking questions on whether it would work better for their combination: Until you or someone dynos your exact combo, then its all hypothetical. I wouldnt take anyones word for any guess until its been tested.
Pro-flo isnt offered with LS3 based ports as far as i know, so no way to compare the two.
Pro-flo isnt offered with LS3 based ports as far as i know, so no way to compare the two.
11-29-2011, 09:40 PM
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What hood do you use? I am ordering one of these for my 443 in the 67 wagon. It has a standard 2" steel cowl hood, so I am curious. I have measured, but would love to hear real feedback.
11-30-2011, 01:01 AM
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I believe this hood would fit with a stock hood. The scoop on it doesnt provide any needed clearance and there is no cowl at the front where the highest point is (above the throttle body)
