CARB DYNO SHOOTOUT: EDELBROCK 750cfm VRS-4150 VS RACE Prepped 800 CFM Q-JET
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- Опубликовано: 1 апр 2024
- Everyone loves a Dyno Shootout and that is what we Have here on Unity Motorsports Garage Today.
If you watched our last Video on Project SLEEPER: we made good power with a simple 408CI Small Block Chevy that is going in my buddy Joe's '67 Chevelle. The Q-JET delivered 480hp can the Edelbrock VRS-4150 beat it???
#edelbrock #quadrajet #nonamenationals #chevy #dragrace #budgetbuild #dyno #holley
For an Emissions Carburetor, the Quadrajet more than holds its own. Thanks for this feature Andy!
Something is not quite right on that Q-Jet. I made 502 hp with an 850 cfm on a performer rpm dual plane on a 383. It had a little over 1 in/hg at 6,200. Fully open the air door by hand, measure between the top of the airdoor and the center rear of the secondary air door opening in the airhorn casting. For maximum flow it should be 1.27" from the backside top of the butterfly to the airhorn casting. Also with the carb off, open the throttle blades up fully and make sure the secondary butterflies are not over centering and starting to close again. 3 in/hg does not make sense even for an 800 model. Cliff Ruggles and I talked about a 406 he built that had a Q-Jet and stock GM cast iron dual plane on it making over 500 hp.
This test means what? A carb that's set up optimally will make more power irregardless of make or model. On the street, the spreadbore will actually work better in most cases. How often are you at WOT for more than a few seconds when driving? That's where the spreadbore Qjet shines, in that half throttle transition area that your gonna be in 90% percent of the time.
I'd say that is a pretty stellar win for the OEM spreadbore Q-jet that it made close to the same power as a modern "race' carb. Q-jets definitely have their limits, but they're a pretty decent carb for what they are.
Edelbrock is no longer a performance company! Investment group purchased them my💔💯
Used to enjoy tuning Q- Jets because the results where rewarding,,the 850 cfm Q Jets especially...
Let's talk about the amazing sound that, only a Q-Jet can make, if you have never felt the rush of those huge back barrels its a hell of a rush.
Quadrajet still dominates for practicability ease of build ability hands down number one and surpasses dependability like nobody's business race on Sunday drive it to work on Monday
The Quad would make equal power if you kept tuning it
Have you asked David Vizard to modify that Q-Jet? He wrote a whole chapter in his book How To Build Horsepower Vol. 2 (1996) Carburetors and Intake Manifolds on how to mod the Q-Jet. Chapter 8. Page 82-92. DV showed how to modify a Q-jet to over 1000cfm....
Thanks for the video back in the '70s I built a69 Camaro drag car 427 tunnel ram mechanical cam 13 to 1 compression with two 800 CFM quadrajets my friend said it would never work it worked all right it screamed I got the car on the nines on race gas have a great day thanks for inspiration I can't build cars anymore but I enjoy your videos
If the choke assembly is set right on the quad jet it's a beautiful cold start carburetor
Gotta love that Quadrajet plus it held its own. Not to mention you can still drive around town with the small primaries and not stop at every gas station. 👊🇺🇲
Qjet when tuned right will hang with any carb
Hello Andy thank you for another great video.
I’d like to see a Dyno shootout of production carbs on same engine. Qjet Vs thermoquad vs Holley etc.
If the QJet is to rich change the metering rods, also most Qjets were 750cfm (small block) ,800cfm was a big block carb. I’d bet you had a 750. With out getting it in the right air fuel mix range it wasn’t fare to the QJet. With the right fuel air mixture the QJet would have matched the new carb. Qjets are awesome carbs people that don’t like them don’t know anything about them. I did many carb tests on my personal dyno years ago, my 1967 Galaxie 500 with a 390 it ran the very best with an 800cfm QJet! It would do 150mph like clock work and was very fast on a drag race . Every other carb I tried the car was slower! Thanks for the video! Go QJet ! And by the way 429 Cobra Jet came factory with a QJet so even Ford approved of them!
I think you are the 1st to dyno this carburetor at least from my search. Should be good content for a heads up shoot out.
If you know about Q-Jets, you know. DV got me really interested in them in one of his early books.
Very cool test, the only thing I would say we can confirm from this test is the Q-Jets are good street carbs but have a lower ceiling than a 4150 square bore carb. I'd like to see VRS vs traditional 4bbl holley 😂