[Saberscar223]

Ive been looking alot and im getting conflicting answers. Im currently FBO E85 with Ported OEM Heads/BTR 225 Cam that has a 32% fuel lobe. I already know what Rods, Pistons I need to get and I want to be able to run 900+ whp. Fueling has been my main roadblock.

Ive heard the LT4 System cant support much more than the LT1 and tops out at around 750 - 800whp, Ive been looking into port injection kits but the prices vary wildly and I dont know exactly where to begin with that. I was looking at the Toohighpsi Port Injection Plates and Injectors but do I need more than that to convert to port injection?

[GreyGhost702]

Originally Posted by Saberscar223

Ive been looking alot and im getting conflicting answers. Im currently FBO E85 with Ported OEM Heads/BTR 225 Cam that has a 32% fuel lobe. I already know what Rods, Pistons I need to get and I want to be able to run 900+ whp. Fueling has been my main roadblock.

Ive heard the LT4 System cant support much more than the LT1 and tops out at around 750 - 800whp, Ive been looking into port injection kits but the prices vary wildly and I dont know exactly where to begin with that. I was looking at the Toohighpsi Port Injection Plates and Injectors but do I need more than that to convert to port injection?

Running Ethanol is what kicks DI systems in the teeth, otherwise their power ceilings are pretty stout. Making reliable/consistent power without E is the other edge of the sword at the power level you're aiming for. There's some great fueling threads over in the FI Tech section you should check out. A lot of reading, but great info on some of the latest & greatest options as well.

As to your question, while it wouldn't hurt to be on an LT4 fueling system if you're going to run Ethanol, and you should run E, the DI system will only carry the load for the hand-off to the Port Injection system. In theory, you shouldn't have to touch the LT1 system if you're going port injection, as the LT1 system is just to keep the car running. Any real grunt work is going to lean on the port injectors. As far as a parts list, you're going to need a controller for the port injection system, along with in-tank pumps, lines, and hardware. I would really do some reading in that FI Tech section. Particularly if you're tackling this yourself. Talk directly with vendors, as well. Most are eager to help and educate.

[jlaudio11]

What kind of boost are you planning on running? I was able to avoid buying port injection plates by getting an intake manifold with port injection holes already in it. I'm north of 900 with stock LT1 DI components, +38 fuel lobe on the btr cam and deka 80 port injectors. DSX Atlas or Toohighpsi reflex+ are the most popular port contrller options. Something I havent seen mentioned yet with the dsx that the reflex+ has is secondary fuel pump control. You will need this at the power level you're shooting for.

[JSH]

Originally Posted by Saberscar223

Ive heard the LT4 System cant support much more than the LT1 and tops out at around 750 - 800whp,

I'm not sure how much hp the OEM hpfp and lpfps will support on Eth, but the OEm hpfp will support close to 1000 wheel using Aux. lpfp on race gas.

[Saberscar223]

Originally Posted by jlaudio11

What kind of boost are you planning on running? I was able to avoid buying port injection plates by getting an intake manifold with port injection holes already in it. I'm north of 900 with stock LT1 DI components, +38 fuel lobe on the btr cam and deka 80 port injectors. DSX Atlas or Toohighpsi reflex+ are the most popular port contrller options. Something I havent seen mentioned yet with the dsx that the reflex+ has is secondary fuel pump control. You will need this at the power level you're shooting for.

Im looking into running the magnesun 2650 and getting the toohighpsi katana fuel rails that fit the 2650. Thing is I have no idea what all id need to get along with the fuel rails to have PI. Ive also heard with PI you dont need to get forged internals so if that saves me alot of money but still keeps the engine safe, Im thinking PI is the way to go.

[Saberscar223]

Originally Posted by JSH

I'm not sure how much hp the OEM hpfp and lpfps will support on Eth, but the OEm hpfp will support close to 1000 wheel using Aux. lpfp on race gas.

The Lt4 or Lt1 hpfp can handle 1000 wheel?

[KingLT1]

Originally Posted by Saberscar223

The Lt4 or Lt1 hpfp can handle 1000 wheel?

LT4 only on race gas. Pump gas 850. E85 700. Blend the E down to 50% and you can make close to 800 with the LT4.

Unless you specify what type of fuel you want to run the answers you will receive will be like a lotto machine spitting out numbers.

[FlukeSS]

Originally Posted by KingLT1

LT4 only on race gas. Pump gas 850. E85 700. Blend the E down to 50% and you can make close to 800 with the LT4.

Unless you specify what type of fuel you want to run the answers you will receive will be like a lotto machine spitting out numbers.

Is it safe to say you lose flex fuel availability when you go boost? Or can you run Flex Fuel with boosted applications regardless of E content?

[Hostile_1LE]

Originally Posted by FlukeSS

Is it safe to say you lose flex fuel availability when you go boost? Or can you run Flex Fuel with boosted applications regardless of E content?

I think there are tuners more than capable of giving you a setup for boost and flex, but I bet most will recommend you only have one type of fuel in the tank at a time, for consistency sake.

The amount of E you can or should run will vary depending on the specific setup and desired boost/power.

[Joshinator99]

Originally Posted by KingLT1

LT4 only on race gas. Pump gas 850. E85 700. Blend the E down to 50% and you can make close to 800 with the LT4.

Unless you specify what type of fuel you want to run the answers you will receive will be like a lotto machine spitting out numbers.

Originally Posted by FlukeSS

Is it safe to say you lose flex fuel availability when you go boost? Or can you run Flex Fuel with boosted applications regardless of E content?

False. These differ from the Mustangs in that regard. On these cars you run a flex sensor that will read E content and add timing accordingly (or retard it with 93). If you’re making big power I’d advise a Smoothboost so that you can dial down boost when you’re on crap gas.

[KingLT1]

Originally Posted by FlukeSS

Is it safe to say you lose flex fuel availability when you go boost? Or can you run Flex Fuel with boosted applications regardless of E content?

No not at all. I have been running a flex fuel sensor with boost since 2019. Depending on fuel system and power level you might have to blend the Ethanol percent down to keep the fuel system happy. E40-60 is really plenty of octane anyway until you get over 1100whp. I run E60 with +30 injectors, LPE HPFP, LT4 tank pump with a JMS. The car makes around 700whp. Stock motor with a blower(10-11psi), fuel system, bolt-ons. Pretty simple combo that will get you around 140mph in the 1/4 mi with a drag pack.

[FlukeSS]

Originally Posted by KingLT1

No not at all. I have been running a flex fuel sensor with boost since 2019. Depending on fuel system and power level you might have to blend the Ethanol percent down to keep the fuel system happy. E40-60 is really plenty of octane anyway until you get over 1100whp. I run E60 with +30 injectors, LPE HPFP, LT4 tank pump with a JMS. The car makes around 700whp. Stock motor with a blower(10-11psi), fuel system, bolt-ons. Pretty simple combo that will get you around 140mph in the 1/4 mi with a drag pack.

You mention you run E60. Is that a tuned E60, or a flex fuel E60?

I'd rather stay away from a tuned E content, would rather stick with flex fuel if possible.

[Joshinator99]

Originally Posted by FlukeSS

You mention you run E60. Is that a tuned E60, or a flex fuel E60?

I'd rather stay away from a tuned E content, would rather stick with flex fuel if possible.

Originally Posted by Joshinator99

False. These differ from the Mustangs in that regard. On these cars you run a flex sensor that will read E content and add timing accordingly (or retard it with 93). If you’re making big power I’d advise a Smoothboost so that you can dial down boost when you’re on crap gas.

I answered this a couple of posts up.

[arpad_m]

Originally Posted by Joshinator99

I answered this a couple of posts up.

Do you understand what he meant by "tuned" E60 vs "flex fuel" E60? There is no difference on this platform, you have to tune the car if you want to use >10% ethanol...