SBF 351w best fuel injection downdraft or weber carbs?

[MarkC]

Im 408 stroker roller motor making around 500hp and im looking for a better look than the carb. I need your guys opinion of if the Summit 8stack by speedmaster downdraft any good? Fuel injection down drafts or maybe weber carbs ? Hep me!! by the way its going in my FF Daytona Coupe i just ordered

[jasond29]

I think you are comparing 2 things at once here.
Stack injection vs conventional injection:
better throttle response, better fuel distribution, individual cylinder tuning.

Fuel injection vs Carb:
Fuel injection really just provides fuel economy over an appropriately tuned/sized carb. Depending on how you run the fuel injection (batch, sequential) you can gain some more tunability from cylinder to cylinder.

That all being said, Prestige motorsports has a good video comparing different stack injection systems. I think for a great all around street system the borla is the preferred if your wanting EFI Stack. Inglese would be the best carb version.

All my opinion obviously.....I ended up going with Kinsler soooooo it really just comes down to looks, tuning.

[eschaider]

When you do these comparisons it is easy to slip into an air valve comparison and review it as an EFI comparison. Stack injection and port injection all use individual cylinder metering. Air valves can be different but the injection is individual port.

The real comparison comes in the EFI's ECU and the supporting software and you can not "see" that. You can feel it when you drive the car and you can benefit from the architecture or suffer from the architecture as you tune the engine but, most importantly you can not see the ECU (other than the physical box), its software or its capabilities.

Significantly you can keep a preferred air valve technology i.e. individual stacks or more conventional single blade air valve and use EFi ECU's that make either air valve work well or work not so well. This becomes a research and buyer be ware adventure which some of us on the site here can help you with.

If you are after a good behaving system with a particular "look" buy the air valve "look" you want and then get the EFI ECU that provides the best tunability, power and price/performance. The two are very different and very important components of the same system.

Parting thought:

EFI will always be easier to tune than Webers. Webers are the most adaptable and also the most challenging of the carburetor style fuel systems to tune because of their adaptability. EFI is among the easiest if you take the effort to learn. If you don't you will be lost in wonderland but even that is not a total loss because some of the EFI providers have very good self learning smarts built in. That said while they can be a good choice you will still need to learn how to use your newly acquired surgeon's scalpel before you do your first brain surgery.

[bobcowan]

Stay away from anything from Speedmaster, Speedmaster79, and Pro-Comp. They are cheap offshore copies of real performance parts. It takes a lot to get them to fit and perform correctly. Look to companies like Borla and Inglese for the right parts.

Wayne Presley can help you. He's a reliable dealer for good systems.

Never buy cheap parts. They're too expensive.