[LesBaer]

Originally Posted by AbsolutHank

I currently run a Magnuson with a Rotofab on the supplied tune from Magnuson. Ive been thinking about adding the LT4 HPFP and Injectors, swapping the pulley and getting it retuned. Is this the best way to go about this? Can I expect 600-620rwhp?

If I add those fuel system parts, will I be able to drive it to my tuner at low rpm/speed?

This is basically what I did - or what I was planning originally in December, except I took it a step further with a cam since they were already going to be ripping everything apart to change the injectors. If you're thinking that you may want to add a cam eventually, you'll save some labor by doing it all together. The cam will also get you up to maximum power output without needing forged rods and pistons...or beyond if you do end up going forged.

Without the cam I recall the estimated RWHP being approximately what you've stated. They also should add a voltage booster and there are some other smaller parts to factor in. I'd have them include the flex fuel sensor as well. While pumps and injectors will give you the added insurance to address the volume of fuel being delivered, adding some E85 to your gas tank gives you some octane insurance. E85 should also get you up to about 650rwhp.

If you don't want to go all out with a cam and changing the injectors (that's where a lot of the labor cost will come from), I think could just do the voltage booster on the LT1 pump and add the LT4 pump. That should be good for another 50rwhp.

I'd give Ted a call if you already haven't...he broke all of this down for me already and can answer your questions.

[parish8]

If you have the intake or blower off changing the injectors is about 1/2hour job. From start to finish pulling the intake and swapping injectors and hpfp and putting it back together doesn't take much over an hour.

[LesBaer]

Originally Posted by parish8

If you have the intake or blower off changing the injectors is about 1/2hour job. From start to finish pulling the intake and swapping injectors and hpfp and putting it back together doesn't take much over an hour.

Ah I just noticed my typo and fixed it..."all out" was supposed to be cam and injectors.

[Chevy71]

So it sounds like the stock LT1 fuel system can support a Maggie without leaning out too much? So long as you aren't chasing a certain HP number, and looking to spin the charger faster. If your wanting to do more or push the engine to higher HP numbers, you'll need to at least add the HPFP for the LT4 because the stock can't deliver the needed fuel at those higher number. Is this correct?

[LesBaer]

Stock psi, it works fine no problem.

[JANNETTYRACING]

Originally Posted by toohighpsi

Can only speak from my personal experience.

2016 Camaro SS A8, mods are Maggie, Rotofab, Borla Cat Back.

• Stock Fuel System, 91 octane - 550 RWHP
• Stock Fuel System, 50% mix 91/MS109 - 612 RWHP
• Stock LT1 Injectors, Lingenfelter Big Bore HPDI pump, 91 octane + 70%water/30%meth injection - 620 RWHP
• Stock LT1 Injectors, Lingenfelter Big Bore HPDI pump, MS109 + 50%water/50%meth injection - 688 RWHP
• LT4 Injectors, Lingenfelter Big Bore HPDI pump, ZL1 in-tank pump, MS109 + 70%water/30%meth injection - 694 RWHP

And that's where I left it last Saturday, didn't have the right size belt to go with a smaller pulley, so picked one up in Sunday and will be looking for more power later this week.
It also might be time to consider adding some more exhaust components. I'm not looking to lose the stock cats, but I may add the shorty headers I bought a couple months back to see if they have any benefit.

Hey Mike,

It would be cool if you added in the pulley used at each power level

[JANNETTYRACING]

Originally Posted by AbsolutHank

I currently run a Magnuson with a Rotofab on the supplied tune from Magnuson. Ive been thinking about adding the LT4 HPFP and Injectors, swapping the pulley and getting it retuned. Is this the best way to go about this? Can I expect 600-620rwhp?

If I add those fuel system parts, will I be able to drive it to my tuner at low rpm/speed?

Good time to do it is during the blower install for sure and will give you a lot more headroom.

The ceiling I found was 575 RWHP on 93 octane with stock LT-1 injectors and HPFP.

[Joe's_cool_1le]

I was just checking a few places on prices for the "Lingenfelter Big Bore HPDI pump" and that thing was 1500 bucks and 500 per injector!!! My god man, that will lighten the pocket for sure. And that doesn't even include the one in the tank? Unless I'm missing something my build just got a lot longer to complete.

[JANNETTYRACING]

Originally Posted by Joe's_cool_1le

I was just checking a few places on prices for the "Lingenfelter Big Bore HPDI pump" and that thing was 1500 bucks and 500 per injector!!! My god man, that will lighten the pocket for sure. And that doesn't even include the one in the tank? Unless I'm missing something my build just got a lot longer to complete.

The LT4 parts are a lot more affordable and will support 750 on race gas.

[Joe's_cool_1le]

Originally Posted by JANNETTYRACING

The LT4 parts are a lot more affordable and will support 750 on race gas.

Thanks Yeah those parts for the LT4 just dropped it to around 1500 for the HPFP and injectors.

[Chevy71]

Originally Posted by Joe's_cool_1le

I was just checking a few places on prices for the "Lingenfelter Big Bore HPDI pump" and that thing was 1500 bucks and 500 per injector!!! My god man, that will lighten the pocket for sure. And that doesn't even include the one in the tank? Unless I'm missing something my build just got a lot longer to complete.

The LT4 HPFP I got priced at 850 and the injectors at 80 each.

[Joe's_cool_1le]

Originally Posted by Chevy71

The LT4 HPFP I got priced at 850 and the injectors at 80 each.

Hook a brother up! Seriously though I'd really like to know if that's pretty much the norm because I think when installing the Whipple it might make it easier to just install the HPFP and injectors while it's disassembled. Thanks in advance!

[USAFS197]

So to make sure I'm tracking this correctly, mid-high 500's is still the ceiling for someone on pump gas, regardless of the means of delivery? E85 is not an option and this is my daily driver. Me thinks meth is also not very prudent.

[toohighpsi]

Originally Posted by toohighpsi

Can only speak from my personal experience.

2016 Camaro SS A8, mods are Maggie, Rotofab, Borla Cat Back.

• Stock Fuel System, 91 octane - 550 RWHP - 98mm pulley
• Stock Fuel System, 50% mix 91/MS109 - 612 RWHP - 90mm pulley
• Stock LT1 Injectors, Lingenfelter Big Bore HPDI pump, 91 octane + 70%water/30%meth injection - 620 RWHP - 85mm pulley
• Stock LT1 Injectors, Lingenfelter Big Bore HPDI pump, MS109 + 50%water/50%meth injection - 688 RWHP - 80mm pulley
• LT4 Injectors, Lingenfelter Big Bore HPDI pump, ZL1 in-tank pump, MS109 + 70%water/30%meth injection - 694 RWHP - 75mm pulley - need belt

*Updated with pulley size information.*