EFI SBC vs LS Motor

[redefined]

Are all of you guys asking about EFI options using this on SBC/BBC? Or are some of you using it on LS applications?

So far everyone has told me to just go LS.

[Ron Sutton]

Originally Posted by redefined

Are all of you guys asking about EFI options using this on SBC/BBC? Or are some of you using it on LS applications?

So far everyone has told me to just go LS.

I can't speak for Bryan or Don, but I was asking in general about the EFI units themselves. You sound like you're deciding between SBC or LS, but going EFI either way.

The current street & track engine package I plan to use & offer for sale is a carbureted 410" SBC that makes 600#/730 hp.

Later in 2014 I'm developing some killer 850+ HP Normally Aspirated LS engines. I wanted to see how the FAST 2.0 is working out ... and if the complaints I hear are factual ... and if so, then what are the better EFI systems.

From what Mark shared with us, it sounds like the FAST 2.0 system is not as tailorable, and therefore doesn't offer the improved street drive-ability that is the key reason for going EFI in the first place.

We can build the same power numbers with a carb. But a carb is impossible to get optimized at each level of the rpm range. The EFI systems are capable of optimizing the fule & spark curve ... and therefore improve the lower rpm drive-ability of any engine. But it sounds like ... at this point of product development ... that some brands do this better & some not so good.

Have you decided SBC or LS yet ?

[carbuff]

I've used a FAST system on an SBC and a Holley HP EFI system on an LS motor. I definitely like the Holley system better, but I'm not an expert at tuning for certain. It was very easy to setup and get running smoothly, and I like the graphing / logging capabilities of the unit as well.

[Ron Sutton]

Originally Posted by redefined

So far everyone has told me to just go LS.

If your goal is to build 700hp with a supercharger, you can do that pretty easy with a SBC or LS. If you have a SBC that is capable of living & thriving with 700 hp, then that will be a less expensive route.

If you're building from scratch, with a 700 hp goal for each, If you did everything the same, the LS will cost a bit more. The larger additional costs you'll run into is if you're doing a change over & need to change everything in the car.

On a side note ...
700 hp with a blower is an interesting territory for most production engines. You can make factory parts work, but the life is shortened. How much depends on many specifics.

For example, you can use an LS1-7 aluminum block, but they weren't designed for that kind of power & heat, and eventually you'll have issues. But an LSA or LS9 block would work well long term. The same concept applies to cranks, rods, pistons, etc, even more so.