[Joshinator99]

Originally Posted by SOCAL.M6.ZLE

I agree, talking with many tuners... (lots of different opinions) but from what I have distilled... Maxing out Di has alot of benefits, and makes more power. Justin White has made almost 1K wheel, on Di only (not even max effort)... and agree's you make more power on Di only.

For me, I like the idea of doing a low side (drop in our aux) cam lobe + HPFP and some 30-50+ XDI's for the win...

You will find there are more opinions than options. Good luck picking one.
In short, I suppose the PC answer might be, consult your tuner, and find out what combination they have confidence tuning. Or, find a tuner that has experience tuning the combination you desire. Forcing one against the other only seems to lead to frustration.

FYI I’m making well over 1K WHP on DI ONLY.

[PeteSS2018]

Thanks all for your responses. I think that to avoid the issues of PI, I'd be most likely to go with either LT4 HPFP (or a Katech Goliath) & Injectors, over low comp GPI drop ins rods/pistons kit.

I feel that will be an advantage when it comes to install & tuning over Port injection, not having to run supplementary fuel rails, low side pumps & lines, etc. and not having the hood clearance issues.

[PeteSS2018]

Originally Posted by Katech_Mike

~950-1,000bhp(800-850RWHP) can be done with 93 octane. Low side, LT4 HPFP, and +30% Injectors.

Thanks Mike. As a matter of interest, would there be an advantage in using your new Goliath instead of an OEM LT4 pump? Or does it require a specific cam, fuel lines or other things? Presumably same injectors?

Also, will the Goliath work off the OEM LT1 Cam?

[Joshinator99]

Originally Posted by PeteSS2018

Thanks Mike. As a matter of interest, would there be an advantage in using your new Goliath instead of an OEM LT4 pump? Or does it require a specific cam, fuel lines or other things? Presumably same injectors?

Also, will the Goliath work off the OEM LT1 Cam?

Maybe Mike will also chime in, but Goliath will work with stock cam (although you’ll get more fuel by running a bigger cam lobe, just like any HPFP). It uses OEM high pressure lines too. It’ll work with any LTx injectors too. Probably good for 10-15% fuel flow over stock LT4 HPFP with a stock cam. No brainer upgrade if you’re doing DI only. But I’d suggest bigger injectors too if you want to take advantage of what the Goliath can do.

[KingLT1]

If you want a stock cam profile, then at least get the BTR big fuel stock cam while it's apart. It's basically L86/LT1 specs with a 32% fuel lobe. The bigger fuel lobe will allow much more potential from whatever HPFP you go with. Imo the Goliath doesn't gain you anything over the LT4 since you will be octane limited to around 800-850whp on 93. I would do Big Fuel stock cam, LT4 HPFP, +30 injectors, and a low side.

[PeteSS2018]

Originally Posted by KingLT1

If you want a stock cam profile, then at least get the BTR big fuel stock cam while it's apart. It's basically L86/LT1 specs with a 32% fuel lobe. The bigger fuel lobe will allow much more potential from whatever HPFP you go with. Imo the Goliath doesn't gain you anything over the LT4 since you will be octane limited to around 800-850whp on 93. I would do Big Fuel stock cam, LT4 HPFP, +30 injectors, and a low side.

Thanks King - that's good advice.

I'm considering cam options but wanting to know this fuel system can work with OEM profile if I decide not to unpack the issues of valve train upgrade/stability/valves/pushrods. Although the revised fuel lobe would be a must have I guess, as would be new lifters and dod delete if a new cam is going in anyway.

I think the Goliath is still a better choice than stock LT4 HPFP in case I decide in the future to run it on E85 (if our availability improves) and gain that little bit of headroom.

Realistically if I could be at 800/850whp (close enough to 1000 crank) then I'd be super happy with that.

One other question - and I hugely appreciate your input on this topic for me - what's the most appropriate low side solution in your opinion? I like the sound of the Katech dual pump in tank returnless module.

It seems a good option, they say it's plug & play, however I have no real knowledge on that front or whether an external controller for the secondary pump is a hassle to tune/set up.

[PeteSS2018]

Originally Posted by Joshinator99

Maybe Mike will also chime in, but Goliath will work with stock cam (although you’ll get more fuel by running a bigger cam lobe, just like any HPFP). It uses OEM high pressure lines too. It’ll work with any LTx injectors too. Probably good for 10-15% fuel flow over stock LT4 HPFP with a stock cam. No brainer upgrade if you’re doing DI only. But I’d suggest bigger injectors too if you want to take advantage of what the Goliath can do.

Yes, DI only. The whole Port Injection scenario looks so interesting ... but it seems that in DI terms, the low side, high side and injector solutions available now are good enough and more straight forward for the level of build I'm interested in.

[radz28]

Originally Posted by PeteSS2018

Thanks King - that's good advice.

I'm considering cam options but wanting to know this fuel system can work with OEM profile if I decide not to unpack the issues of valve train upgrade/stability/valves/pushrods. Although the revised fuel lobe would be a must have I guess, as would be new lifters and dod delete if a new cam is going in anyway.

I think the Goliath is still a better choice than stock LT4 HPFP in case I decide in the future to run it on E85 (if our availability improves) and gain that little bit of headroom.

Realistically if I could be at 800/850whp (close enough to 1000 crank) then I'd be super happy with that.

One other question - and I hugely appreciate your input on this topic for me - what's the most appropriate low side solution in your opinion? I like the sound of the Katech dual pump in tank returnless module.

It seems a good option, they say it's plug & play, however I have no real knowledge on that front or whether an external controller for the secondary pump is a hassle to tune/set up.

I like my Katech module. I can control it just fine with my REFLEX PI controller, but Katech has a controller they offer, too. For me, an in-tank aux' pump solution made the most sense because I didn't like the weeping from the tank tap non-in-tank pumps use. I would not be able to pass inspection with the weeping. Additionally - I liked the idea of maintaining the "bucket" the factory uses to prevent fuel starvation when going around the track. Unless you, strictly, stick to straight-line stuff, fuel sloshing away from the pick-up could be an issue.

Tuning for the Katech pump module was fairly easy. There are lots of videos you can pay to watch and learn from, but once you get the idea on what you need to change, just driving it, logging, and tuning isn't a big deal. With what I'm using, there isn't a big spike in pressure when the aux' pump kicks-in, and I have the ability to ramp it in easier and run it just enough to stay ahead of what the fuel system needs. It's definitely more involved than the other solutions out there, and I'm fine with that.

[KingLT1]

Originally Posted by PeteSS2018

Thanks King - that's good advice.

I'm considering cam options but wanting to know this fuel system can work with OEM profile if I decide not to unpack the issues of valve train upgrade/stability/valves/pushrods. Although the revised fuel lobe would be a must have I guess, as would be new lifters and dod delete if a new cam is going in anyway.

I think the Goliath is still a better choice than stock LT4 HPFP in case I decide in the future to run it on E85 (if our availability improves) and gain that little bit of headroom.

Realistically if I could be at 800/850whp (close enough to 1000 crank) then I'd be super happy with that.

One other question - and I hugely appreciate your input on this topic for me - what's the most appropriate low side solution in your opinion? I like the sound of the Katech dual pump in tank returnless module.

It seems a good option, they say it's plug & play, however I have no real knowledge on that front or whether an external controller for the secondary pump is a hassle to tune/set up.

I agree but you specifically said no E85 prior. So please be honest with your goals and I can give better advice. If you ever plan on running E85 and Port is not an option, then by all means get a Goliath pump and +50's now.

I have no experience but from what I am hearing the dual in tank pump solution seems to be working pretty well.

[laynlo15]

Lots more options now, take your pick.

[RobZL1]

It's a little more expensive but I'm really liking the sound of the DSX low side solution. Drop it in and go. Returnless, keeps stock siphon capabilities, keeps stock lines, and apparently supplies 1000rwhp+.

[PeteSS2018]

Originally Posted by RobZL1

It's a little more expensive but I'm really liking the sound of the DSX low side solution. Drop it in and go. Returnless, keeps stock siphon capabilities, keeps stock lines, and apparently supplies 1000rwhp+.

Ditto. I feel that the more the overall fuelling arrangement - either LS or HS - follows the OEM principles, the more it seems like the right approach.