[Berto24]

Has anyone flowed a stock LT1 fuel pump? I saw somewhere else that it flows similar to an intank walbro 255.

[laynlo15]

What year? I have a 2022 Lt1 that had 73 psi lowside which is more than the original Lt1s prior to the 2019 SS.

[Berto24]

Originally Posted by laynlo15

What year? I have a 2022 Lt1 that had 73 psi lowside which is more than the original Lt1s prior to the 2019 SS.

2018 SS I was just wondering what is the lph of the pump is someone has measured it

[laynlo15]

Are you planning more mods that you need this information for? If your going to do a Supercharger of some type you'll need to upgrade the low side and high side if you decide to make much more power over 550 rwhp.

[KingLT1]

Not sure if this helps but the stock ECM tune shows 381 lb/hr for the LT1 low side pump in the early SS models. The LT4 stuff shows 444lb/hr.

[laynlo15]

Originally Posted by KingLT1

Not sure if this helps but the stock ECM tune shows 381 lb/hr for the LT1 low side pump in the early SS models. The LT4 stuff shows 444lb/hr.

I guess I could have went back and looked at one of my stock logs. Good info

[Berto24]

Originally Posted by KingLT1

Not sure if this helps but the stock ECM tune shows 381 lb/hr for the LT1 low side pump in the early SS models. The LT4 stuff shows 444lb/hr.

Yeah that works! I was just curious

[Berto24]

Originally Posted by KingLT1

Not sure if this helps but the stock ECM tune shows 381 lb/hr for the LT1 low side pump in the early SS models. The LT4 stuff shows 444lb/hr.

Originally Posted by laynlo15

Are you planning more mods that you need this information for? If your going to do a Supercharger of some type you'll need to upgrade the low side and high side if you decide to make much more power over 550 rwhp.

Yeah I am going procharged, I already have the complete lt4 fuel system. I was just curious because I couldnt find any info on lt1 pumps.

[tortilla-flats]

(Raising this one from the dead.)

How do I tell if I have an upgraded low side fuel pump? Is there something in the tune file I can read? Or do I need to make a log?

[Megahurtz]

GM seems to have updated the LT4 low side pump when the C7 ZR1 came out. It was used in the 2019 Z06 as well. Then at some point it made its way into the ZL1's and all 1LE Camaro SS's.

It's rumored that the 2022+ ZL1's and any ZLE car got the better low side pump. Seems to be true based on the cars I've tuned. But I have seen no actual proof.

It does make sense that GM would maintain 1 or 2 pumps rather than multiple pumps as it would be a cost savings to manufacture less versions.

[PeteSS2018]

Anyone know how what the low side solution is in the C8 ZR1? Obviously 1000+hp and feeding combined PI/DI so maybe the ZR1 solution can also help people out looking for Camaro fuelling options?

[Joshinator99]

Originally Posted by PeteSS2018

Anyone know how what the low side solution is in the C8 ZR1? Obviously 1000+hp and feeding combined PI/DI so maybe the ZR1 solution can also help people out looking for Camaro fuelling options?

Would not be surprised to see a twin pump setup like the GT500 did.

[Saberscar223]

Originally Posted by laynlo15

What year? I have a 2022 Lt1 that had 73 psi lowside which is more than the original Lt1s prior to the 2019 SS.

Sorry to revive this again but this is really interesting to me, So is there an upgraded LT1 pump in the 2019+ thats better than pre 2019 LT1s or is it the LT4 pump in the 2019+ SS. I know for sure 1les come with the newer LT4 pump. Im going all out on highside but my intake pump would be extremely annoying to access since my whole exhaust system is welded together.

[7speed]

Not sure but at 11:16 this shop says 2019 up have lt4 lowside

https://youtu.be/Kk29a3NfQ4g?si=W8LymGUhl0JihvFy&t=672