Double pumper w/ auto trans
Thread Starter
Pro
Joined: Apr 2007
Posts: 736
Likes: 1
From: Chester VA
Double pumper w/ auto trans
I currently have a 670 Street Avenger that has been given me issues. I inquired to AED about having it rebuilt and setup/tuned for my car, and they said I would be better off with a 750 DP. I inquired to another local carb source and actually got the same advice. I always was under the impression double pumpers don't work well with autos unless they have a real loose converter. The car was estimated by the shop that built it at 425hp, it's an LS1 and likes to rev, it has a 2400-2600rpm stall, 2004r and at the moment a 3.08 but I'm hunting for 3.50 gears. Is a DP the best choice, I've had them on other cars and loved them but those were always with sticks.
Team Owner
Joined: Jul 2004
Posts: 34,067
Likes: 23
From: Pacific N.W. Warshington
I'm not a carb expert but my son has alternated between holley 750HP and 650 w/ promod 750 body casting DP. The DP hits harder, sooner off idle. That is on a Pontiac with an automatic. I don't think the DP would/could hurt performance. Some of the old cliches about double pumpers with stick shifts only seem to be just that.
Burning Brakes
Joined: May 2008
Posts: 860
Likes: 0
From: Stratford Ontario
Your setup would be perfect for a DP. Vacum secondaries are more for gas milage. If You were affraid of gas milage You wouldnt have gone the route You did. If You can tune the primary You can tune the secondary,just a little more work to dial it in, then its all fun. Put the DP on and enjoy driving.
Racer
Joined: Jan 2008
Posts: 288
Likes: 0
From: Schaumburg Illinois
i have a holley 750 DP on my 355. other than a slight off idle bog when you really floor it i have no issues. i think the bog is a result of 3.08 gears and no converter, i'm working on trying to cover it up with pump shot but it might be as good as it's going to get. tip in is amazing, gets right up and goes. i don't care about milage, as long as i have enough gas to get to the next station...
Thread Starter
Pro
Joined: Apr 2007
Posts: 736
Likes: 1
From: Chester VA
Well I ordered an AED 750 HO Double Pumper. AED is actually right across town from me and is a great shop, and make the carbs and all their other AED branded parts in house. I got it from Summit though as they actually sell the carb cheaper than AED sells it in their own showroom.
Racer
Joined: Aug 2010
Posts: 297
Likes: 9
From: Holiday Shores IL
Looks great.
The carb pictured has 4 corner idle.
They are a little tougher to dial in.
Once you get the carb dial in you will be impressed with the performance.
Be prepared to buy various jet sizes and boosters to get it really dialed in.
Better yet, find someone that has a bunch of Holley tuning parts you can borrow and figure out what works best for your engine.
Back in the day, I was lucky enough to have access to a automotive machine shop that had every imaginable Holley part. After a few hours I knew exactly what I needed.
The carb pictured has 4 corner idle.
They are a little tougher to dial in.
Once you get the carb dial in you will be impressed with the performance.
Be prepared to buy various jet sizes and boosters to get it really dialed in.
Better yet, find someone that has a bunch of Holley tuning parts you can borrow and figure out what works best for your engine.
Back in the day, I was lucky enough to have access to a automotive machine shop that had every imaginable Holley part. After a few hours I knew exactly what I needed.
Thread Starter
Pro
Joined: Apr 2007
Posts: 736
Likes: 1
From: Chester VA
A local shop does dyno tuning by the hour + cost of the tuning parts they use. I'm thinking of going that route. I've always set up my own carbs, and was happy with getting them 90% perfect. I've got enough time and money in this car now I'm willing to pay a couple hundred bucks to get that last 10% with a dyno slip to prove it 
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