6-pack vs. single carb • The Dodge Challenger Message Board

by **dp73115** » 29 Dec 2008 14:21

I have a 400 BB bored and stroked to 512 CI and it is making around 530hp. I am currently running a Holley 850 dbl pumper on a Edelbrock RPM intake. I am not sure why, but I really want to put a 6-pack set-up on the engine just for the appearance. If I do this change, will it negatively effect the engine performance or am I just worrying for no reason? And just how hard is it to set-up and tune the 6-pack? My friends keep telling me to stay clear of it because it is a pain to get it right. Any thoughts on this?

by **fal308** » 29 Dec 2008 14:52

Have you looked into the Six Pack style fuel injection units? There was a discussion of them on here several months ago. You get the looks of a six pack with the ease of efi :thumbsup:

by **dave-r** » 29 Dec 2008 16:16

The six pack is indeed a pain to set up on a non-stock engine. But will work well when fine tuned. They tune just the same as your 4bbl. But the two outer carbs have plates rather than jets. But there are tricks to get around that.

Check out http://promaxcarbs.com/

by **Eddie** » 29 Dec 2008 17:14

I agree with Dave. I have a Pro-Max sixpack setup as well. Sure it will cost you some cash and I would buy the modded setup already built that way you wont have to buy more parts than you need. Dave should post a pic of his current setup which would look and function well under your hood! Plus you have a few more cubes to make use of that massive torque and H.P. potential. Unless you are a class racer in competition, you wont notice the performance difference on the street with your tires and traction. There are a lot of very fast Six-packs out there that dispute the six-pack being an archiac performance mod. I applaud your dedication to the Six-Pack!! :V8:

Stock sixpacks have a bog going from the cruise to the enrichment circuit. This 'bog' or stumble is tuned away with adjustable jetting as opposed to drilling the outer fixed metering plates. Makes tuning a breeze. I tested mine with a wind band O2 sensor and a LM-1 meter, it runs at 12.9-13.1,,perfect for street/strip.

by **Eddie** » 29 Dec 2008 17:16

ps Dave, I liked your other avatar, why you changed it? :lol:

by **fbernard** » 29 Dec 2008 18:29

airfuelEddie wrote:ps Dave, I liked your other avatar, why you changed it?

To fit his tagline better... :s023:

by **Eddie** » 29 Dec 2008 18:51

fbernard wrote:
airfuelEddie wrote:ps Dave, I liked your other avatar, why you changed it?

To fit his tagline better...

by **dp73115** » 30 Dec 2008 6:35

Thanks for the opinions and advice. I will give Promax a call. I scanned through the earlier posts and didn't see anything about the EFI set-ups. Are they throttle body injectors that look like carbs, i.e. like the ones chevy used? Can you tell me who makes this EFI six-pack?

by **fal308** » 30 Dec 2008 16:24

Yes, the efi setup looks like a carb setup. I did a quick search but couldn't find the thread. Maybe Eddie remembers .

by **Eddie** » 30 Dec 2008 16:28

Man, Barc, you got here a few seconds before I did! :lol:

www.fbthrottlebodies.com Keep in mind DP, the throttle body injection is 2 types, actually 3 but for our discussion here it's 2. The throttle body comes in basically 2 flavors. Electronic controlled TB injection with 3 2barrel injection units and the preferred setup is the air valve throttle bodies with port fuel injection. The difference is the fact that the port fuel contains a fuel rail with injectors that spray a nice atomised fuel plumb at the back of a warm intake valve, very nice power with superior torque production. The other type is an OEM designed throttle body that contains a set of 2 injectors that alternate the pulses inside the throttle body and spray the fuel above the throttle plates like an old archaic carby, sloppy , wet, inefficient. I would NOT use a TB with injectors inside the TB. There will be NO performance gain, tuning is limited due to the alternating sequence of the spray, without getting to technical it sucks and cost a lot of money for very little gain. The truth is the throttle bodies worked well in pickup trucks that operated at low engine speeds and needed a good torquey engine. The TB in my opinion was a carry over engineering project to appease govt. emission regulations instead of developing a superior system like the Multi-Point port fuel injection which is vastly superior because the intakes now only flowed air no fuel. This is a HUGE advantage. The F&B six-pack system looks very nice, it's port fuel injection, the throttle bodies only carry air, has a 8-AN fuel supply line, fits stock type aircleaners according to their site, looks nice flows a lot of air. It will not be cheap. You will need a PCM and someone who knows what they are doing. The fuel system will need to be upgraded to a high flow electric pump,(this is mandatory), large enough fuel lines 3/8 will be fine, F.I. doesnt need the huge lines as a carby and low volume low pressure mechanical pump. A Holley Blue would work fine. It would idle clean, have great torque, make nice H.P. the potential for peak power is the same versus a well tuned race type carby . The REAL benefit is longer engine life, cleaner burn, longer lasting sparkplugs and tune is always good. Fuel Injection makes MORE power under the curve. For competition it's a wash, but for street driving there is NO comparison!!(This is just my opinion only)