AED vs Holley vs Demon.
10-16-2010, 11:06 PM
#1
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AED vs Holley vs Demon. I'm now onto the search for a carb. After checking out the setup sticky you guys put up; actually helped me out that was a great idea. I saw a bit of a pattern. The AED 750 HO and the Holley 750 HP seem to be the two popular carbs amongst you guys. The real difference I could find was the AED is apperantly good to go out of the box. What makes them so much different from the Holley units?
Going on a new bone stock LS6.
Oh and I just threw the Demon choice up there for ***** and giggles. Anyone running these?
Thanks
Going on a new bone stock LS6.
Oh and I just threw the Demon choice up there for ***** and giggles. Anyone running these?
Thanks
10-17-2010, 06:49 AM
#2
Buddies vac sec 650 Demon traps 96 in his 6.0 powered malibu in the 1/8, pretty damn good. But any holley base with a flowed out main body and the works will all be pretty close performance wise. So i am not against or for any of the mentioned options as i can tune myself pretty easily.
10-17-2010, 03:47 PM
#7
buy a demon carb, then take it apart and clean out ALL the metal shavings they leave in them for you to find later on. I'll torn apart 4 different ones that had crap in the passages or just sitting in there after running them a few years back.
I love my quick fuel carb on my car, any mechanical secondary carb would be a huge benefit over the vacuum secondaries. You will peak up more power with one as the VS carbs never fully open the rear barrels and i'm not sure how zones keeps recommending them on here, they're great for a tow vehicle or motorhome but have no place on a performance sports car.
I love my quick fuel carb on my car, any mechanical secondary carb would be a huge benefit over the vacuum secondaries. You will peak up more power with one as the VS carbs never fully open the rear barrels and i'm not sure how zones keeps recommending them on here, they're great for a tow vehicle or motorhome but have no place on a performance sports car.
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10-17-2010, 05:07 PM
#9
you can't make them open all the way 100% thought, basically ever. We had a 750vs and a 650 dp on the dyno, the 650 made more power between the two. Grab the secondary rod on the 750 and it would jump 20 hp on the dyno if you pushed them 100% open otherwise it was down on power between the two.
10-17-2010, 05:19 PM
#10
I think your personal experience was with a faulty vacuum secondary carburetor. Since I have 20+ years experience with Holley carburetors, I will go ahead and make the definitive statement that the secondaries on a vacuum carburetor will open completely if the unit is functioning properly.
10-17-2010, 05:30 PM
#11
Never seen a brand new one one open up "fully" until upper rpms. Also using a paper clip on the rod to check how far it opens we didn't have full opening at the track either. Sure you can buy the spring kit and all that to change opening point but maybe I've just messed with non-functioning out of the box holleys which even after spring swaps never opened 100% and never had as good an ET as a double pumper of similar size. A quick google search shows several comparisons between the two carbs and the double pumper running better ET and making more power than a VS counterpart.
10-17-2010, 06:20 PM
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I've been happy with my AED. I had a off idle stumble when I would first get into it, replaced the front pump with a 50cc unit and haven't had a problem since
10-18-2010, 08:51 PM
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I'll be going with mech secondarys.
The big thing I'm wondering is; are these "race" version carbs something I really need? This is just a stock LS6, so it's not an extreme motor in any way. But what about the forces I'm going to put the carb through? There's going to be alot of g-force changes; and it's not just idle to WOT. Lot's of throttle modulation involved with road racing. I've seen a couple of road race versions offered by a few companies, but it adds a 100 or so dollars to the price tag. I don't want to spend that extra money if I don't really have to..
The big thing I'm wondering is; are these "race" version carbs something I really need? This is just a stock LS6, so it's not an extreme motor in any way. But what about the forces I'm going to put the carb through? There's going to be alot of g-force changes; and it's not just idle to WOT. Lot's of throttle modulation involved with road racing. I've seen a couple of road race versions offered by a few companies, but it adds a 100 or so dollars to the price tag. I don't want to spend that extra money if I don't really have to..
10-19-2010, 06:27 AM
#18
It's definitely nice to have adjustable air bleeds and idle feed restrictors. In that sense the HP carbs are a worthwhile upgrade. I simply couldn't get my 750 DP to not stumble off idle until I started adjusting the bleeds. Jets, cams and larger accel pump volumes simply wasn’t enough. I thought about upgrading the body and metering blocks but still wanted to keep a choke. So instead I drilled out the press in restrictions and replaced them with brass set screws that I drill out myself. The thing runs perfect off idle now and saved $100+ right there.
As for G forces one of the few mods I have seen toward that are jet extensions and notched float bowls. You can add all that stuff to a standard carb, but then you start getting back to the price of the high end carbs.
I have always liked the look of the Quick Fuel SS carbs. Price is a little more than $100 above a standard double pumper, but you get a lot of upgrades for that price. They already have the notched floats and jet extensions, plus you can get annular boosters and adjustable secondary linkage for that throttle response you want. Not to mention a half dozen other upgrades over a standard Holley.
Seems like a great deal to me.
As for G forces one of the few mods I have seen toward that are jet extensions and notched float bowls. You can add all that stuff to a standard carb, but then you start getting back to the price of the high end carbs.
I have always liked the look of the Quick Fuel SS carbs. Price is a little more than $100 above a standard double pumper, but you get a lot of upgrades for that price. They already have the notched floats and jet extensions, plus you can get annular boosters and adjustable secondary linkage for that throttle response you want. Not to mention a half dozen other upgrades over a standard Holley.
Seems like a great deal to me.
Last edited by Pop N Wood; 10-19-2010 at 06:34 AM.
10-19-2010, 09:48 AM
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hmm I wonder if going to a 50cc front pump would fix my now slight stumble? Im running a Holley 750dp, out of the box it was nearly spot on compared to the Eddy that I was running which had been F'd with to the max to fix the WOT stumble
10-19-2010, 09:59 AM
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buy a demon carb, then take it apart and clean out ALL the metal shavings they leave in them for you to find later on. I'll torn apart 4 different ones that had crap in the passages or just sitting in there after running them a few years back.
I love my quick fuel carb on my car, any mechanical secondary carb would be a huge benefit over the vacuum secondaries. You will peak up more power with one as the VS carbs never fully open the rear barrels and i'm not sure how zones keeps recommending them on here, they're great for a tow vehicle or motorhome but have no place on a performance sports car.
I love my quick fuel carb on my car, any mechanical secondary carb would be a huge benefit over the vacuum secondaries. You will peak up more power with one as the VS carbs never fully open the rear barrels and i'm not sure how zones keeps recommending them on here, they're great for a tow vehicle or motorhome but have no place on a performance sports car.
