[Sayykidd]

Originally Posted by Trochoidal

I’d also say to go with LT4 fuel for 2 reasons. How long before 7 lbs turns into maybe 10 pounds? Maybe you never want to deviate, but if you do the fueling is there and ready to support “turning it up”.

The 2nd reason is to have the ability to run E85. Is E85 in the picture or are you planning on staying with 93 octane?

Planning on staying with 93 and I don’t plan on turning up lol

[MSU120]

Originally Posted by Sayykidd

Just want to make it to 600 hp lol

Then you’ll need the LT4 system.

[Sayykidd]

Originally Posted by MSU120

Then you’ll need the LT4 system.

Okay so look up lt4 fuel system and put that in there and get my pro charger and a good tune and be good to go?

[KingLT1]

Exactly why I said to get the LT4 fuel system. Most stretch the stock fuel system so it's a touch on the lean side even at 7psi. Then when it gets cooler out you make more boost and bam out of fuel.

There is a active thread in the forced induction section right now with good information. Cjperformance is the OP.

[Joshinator99]

Originally Posted by KingLT1

Exactly why I said to get the LT4 fuel system. Most stretch the stock fuel system so it's a touch on the lean side even at 7psi. Then when it gets cooler out you make more boost and bam out of fuel.

There is a active thread in the forced induction section right now with good information. Cjperformance is the OP.

Bingo. Playing with the fuel system on a stock LT1 short block is a great way to find out how much new pistons and rods cost… If you fuel it correctly and get a good tune, it’ll live a happy life. I ran my stock LT1 shortblock in the 600-670 WHP range for two years with no problem before deciding to build the motor and turn up the boost. But fueling and tune were the key as King has alluded to.

[Sayykidd]

Originally Posted by Joshinator99

Bingo. Playing with the fuel system on a stock LT1 short block is a great way to find out how much new pistons and rods cost… If you fuel it correctly and get a good tune, it’ll live a happy life. I ran my stock LT1 shortblock in the 600-670 WHP range for two years with no problem before deciding to build the motor and turn up the boost. But fueling and tune were the key as King has alluded to.

So lt4 fuel system and then I can get my procharger wirh a get tune and I can have a happy life ?

[Joshinator99]

Originally Posted by Sayykidd

So lt4 fuel system and then I can get my procharger wirh a get tune and I can have a happy life ?

Yes

[parbreak]

The LT4 fueling (HPFP and injectors) are money well spent. I think I spent maybe $1150ish at the time. They are not necessary on a P1SC or P1X if you stay below 7 psi and maybe 580HP. Cam not necessary. Had mine at 545 HP on stock fueling before turning it up to 630 with LT4 and E.

[wnta1ss]

LT4 fuel system is a good idea because not every car taps out at the same spot. Base supercharger kits are sold as being ok for a stock LT1, but that is not always the case in other words. Cjperformance for example recently did a Procharger with the base pulley, and his was losing low side fuel pressure, while his high side was maxed out. My SS with a base pulley supercharger was losing high side fuel pressure and the injector pulse width was too much. I had pre-emptively upgraded to the ZL1 in-tank pump, so I don't know if my stock low side pump was also weak. CJ and I only knew about it because we had bought HPT, so many guys are unaware of how close to the line, or even over, they are on the fuel system, because they are not datalogging. This means that a lot of the guys who've said the LT1 fuel system was adequate for the supercharger, don't actually know whether it was or not.

[KingLT1]

One thing to keep in mind. A LT1 with about 7psi makes similar power to a stock LT4 which makes 9-10 psi. The higher compression of the LT1 allows it to make similar power at less boost. The LT4 comes from the factory with a better fuel system. Ideally you will need to run the LT1 a touch richer for cooling on pump 93 due to the increased compression which further increases fuel demand. So that means a 7psi setup really needs the LT4 fuel system hence why I always suggest it as a minimum.

[parbreak]

Originally Posted by KingLT1

One thing to keep in mind. A LT1 with about 7psi makes similar power to a stock LT4 which makes 9-10 psi. The higher compression of the LT1 allows it to make similar power at less boost. The LT4 comes from the factory with a better fuel system. Ideally you will need to run the LT1 a touch richer for cooling on pump 93 due to the increased compression which further increases fuel demand. So that means a 7psi setup really needs the LT4 fuel system hence why I always suggest it as a minimum.

Agreed. I ran mine around for about a year before doing LT4 but I didn't beat on it relentlessly.

[MSU120]

Originally Posted by parbreak

Agreed. I ran mine around for about a year before doing LT4 but I didn't beat on it relentlessly.

Same here…about 10 months. With Prochargers tune and LT1 fuel, it put down 545rwhp. With custom tune and LT4 fuel, it jumped to 589 (same boost: 7lbs).

[cjperformance]

Originally Posted by KingLT1

You will want to upgrade the fuel system to the LT4 stuff at minimum. The tune Procharger supplies is no good, so plan on a tuner kit and get it tuned by somebody that knows gen5 engines. You will also want a LS3 crank seal and a metco valve cover breather with the one way check valve disk...or get the mighty mouse system.

Second that. Just went through all that! DONT RUN THE PROCHARGER TUNE.

[Dennis 2ss]

Originally Posted by MSU120

Same here…about 10 months. With Prochargers tune and LT1 fuel, it put down 545rwhp. With custom tune and LT4 fuel, it jumped to 589 (same boost: 7lbs).

Very similar as mine. Got 553whp on stock fuel. Saw you are at 707whp now, what is done to reach that? 700s are my goal this year just ordered stage 1 cam 38% fuel, LT4 pump and injectors, pistons, rods and E85. Hoping for high 600s at least.