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FITECH vs Carb Test

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5.6K views 3 replies 2 participants last post by  jeff swisher  
N
#1 ·
Well, had a day on the dyno with the FITECH system. Have to say, im pretty impressed with it. Sadly the FITECH tech guy didnt make it out, but our Rep who was very familiar with it did. Due to this we didnt get to test as much as we liked, but after 10 mins of run time on the FITECH system and 2 dyno pulls this is the difference she made over a Quick Fuel vacuum secondary 680cfm carb (see below) She definitely had more in her with more learning time and adjustments, but it was a nice gain.

Engine Info:

Bore/Stroke: 4.040 x 3.750
Displacement: 383 C.I.D.
Crankshaft: Scat Nodular Iron 3.750" Stroke Externally Balanced Rear/Internal Front 1pc.
Connecting Rods: Scat 4340 Forged I Beam 5.700" ARP 8740 Bolts
Pistons: Hypereutectic
Piston Rings: Moly Rings
Compression Ratio: 9.7:1 Compression
Camshaft: Hydraulic Roller
Camshaft Specifications: 220/224 @050 .528in/.536ex 112LSA
Camshaft Bearings: Installed & Clocked to OEM Position
Cylinder Heads: Pro-Filer Aluminum 64cc/195cc 2.02/1.60
Freeze Plugs: Brass Installed & Sealed
Rocker Arms: Stamped Steel 1.6 Ratio
Intake: Weiand Stealth dual plane
Distributor: MSD HEI


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J
#2 ·
Did you get to use any other carbs (like larger ones).. was jetting optimized along with air bleeds on the carb?
What is the CFM rating on the FiTech.. did you get to play with any carb spacers or was this a.. pull the 680 out of the box and bolt it on?

I like the idea of being able to add boost easily to the FI system..
 
N
#3 ·
The carb we spec thru Quickfuel for this engine combo, so its not out of the box, its shipped with the bleeds/jets we spec.

FItech system ran: Go EFI 4 600 HP | 30001

No spacers were used/needed, typically they dont do much for this lower power stuff from what we seen in the past, they may pick up a little more up top, but give up some down low.

Like I said, it ended up being a rush job since their tech wasn't able to make it and we have alot of stuff to dyno. This is a proven engine combo though and it definitely ran better, you could hear the difference in how much smoother it ran with the FITECH with very little run time.
 
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