[hogwild87]

Just wondering how much more flow I can get out of the combo of these two. It's a given I'm gonna need low side I know that, and I'm sure I'll go with stock lt4 hpfp but do I really need the lt4 injectors as well? I saw where FIC is offering injectors that flow like 30% over lt4 but I ain't trying to pay 450 an injector lol

[Turbo_RORO]

I don't know. But I spoke with Cordes and they said that with their low side and the LT4 high side that the system could support 900 whp on e85. So I'm guessing that on something like MS109 and Meth you could do a little over 1000whp. Also congrats on the new time. Did it go nines on the stock fuel system and meth? or did you change anything?

[Turbo_RORO]

My bad I didn't answer your question. While I don't have them yet I think that if your goal is around 900 or less then they are worth it. Cordes has their injectors and I was also informed of a new HPFP that could out flow the Lingenfelter for similar money. So in the future we could have a 1100whp fuel system without meth or secondary injectors. But its gonna cost.

[jessrayo]

Originally Posted by hogwild87

Just wondering how much more flow I can get out of the combo of these two. It's a given I'm gonna need low side I know that, and I'm sure I'll go with stock lt4 hpfp but do I really need the lt4 injectors as well? I saw where FIC is offering injectors that flow like 30% over lt4 but I ain't trying to pay 450 an injector lol

Depends on if you are running regular gas or e85. If you run regular 91 octane pump gas the Lt1 cannot really use the extra fuel potential of the LT4 mechanical pump. You have to run more boost to keep the air fuel ratios in balance and the compression ratio is so high on the lt1 that you can only get about 650 whp before knock becomes a problem with the high compression ratio. The stock LT1 mechanical pump can handle 650 whp fine. If you want to buy 100+ octane race gas then you can use the the LT4 mechanical pump.

If you run e85 and are tuned to just run e85 it takes more fuel and e85 is a lot more knock resistant. If you plan to tune for e85 then the lt4 mechanical pump makes sense.

If you switch the mechanical pump you should change the injectors. These are DI engines and the injectors are designed to completely atomize fuel at specific high pressure ranges. The LT1 injectors are not designed to operate at the higher fuel pressures provided by the LT4 pump and they will not be as efficient with the higher pressures.

[Turbo_RORO]

Originally Posted by jessrayo

Depends on if you are running regular gas or e85. If you run regular 91 octane pump gas the Lt1 cannot really use the extra fuel potential of the LT4 mechanical pump. You have to run more boost to keep the air fuel ratios in balance and the compression ratio is so high on the lt1 that you can only get about 650 whp before knock becomes a problem with the high compression ratio. The stock LT1 mechanical pump can handle 650 whp fine. If you want to buy 100+ octane race gas then you can use the the LT4 mechanical pump.

If you run e85 and are tuned to just run e85 it takes more fuel and e85 is a lot more knock resistant. If you plan to tune for e85 then the lt4 mechanical pump makes sense.

If you switch the mechanical pump you should change the injectors. These are DI engines and the injectors are designed to completely atomize fuel at specific high pressure ranges. The LT1 injectors are not designed to operate at the higher fuel pressures provided by the LT4 pump and they will not be as efficient with the higher pressures.

Thanks for the info. I've watched your build also. how is the AGP holding up?I should have prefaced that I am all about testing fuels. I recently got into the MS109 and I am liking it so far. but I have a little more experience in ethanol based fuel.

[hogwild87]

Originally Posted by Turbo_RORO

I don't know. But I spoke with Cordes and they said that with their low side and the LT4 high side that the system could support 900 whp on e85. So I'm guessing that on something like MS109 and Meth you could do a little over 1000whp. Also congrats on the new time. Did it go nines on the stock fuel system and meth? or did you change anything?

Thanks and yes went 9.95 on stock fuel system on 93 plus the dual nozzle meth

[jessrayo]

Originally Posted by Turbo_RORO

Thanks for the info. I've watched your build also. how is the AGP holding up?I should have prefaced that I am all about testing fuels. I recently got into the MS109 and I am liking it so far. but I have a little more experience in ethanol based fuel.

AGP system has been flawless so far. I'm considering selling the car so I can build a twin turbo ZL1 1LE. I think I could push the stock LT4 longblock to 1000 whp with just some right sized turbos and an add on port injection system like parish8 is doing. For me I think this would be the ultimate street/road course car.