[BlackbeastSS2]

Above 700 you will need fuel support. Dsx Aux fuel pump kit

[KingLT1]

Originally Posted by BlackbeastSS2

Above 700 you will need fuel support. Dsx Aux fuel pump kit

A LT1 car needs fuel support below that. Stock LT1 tank pump doesn't support 700whp. I am running a LT4 pump with JMS and it might have another 50whp headroom left in it on E60. My car traps 137 full weight on 20" wheels...so whatever WHP that equals. I never really cared about dyno numbers without a baseline.

Either way I have a pretty good idea what power level these cars need X fuel mods being I have tuned several of these cars from 600whp all the way to 1000whp.

Hoping Pray would stop in and give some details of the build and how he stretched the fuel system out that far. I like to pick the brains of knowledgeable folks. We used to chat about tuning off and on in the past. Now he doesn't seem to have much time for it...

[Joshinator99]

Originally Posted by KingLT1

Oh yeah for sure. I am honestly surprised it can even make a pull to 6k rpm but Brett probably has a few tricks under his sleeve with injector timing and rail pressure to squeak a little more out.

The most I had ever seen a stock LT1 fuel system support on 93 was 650whp with a cam. That was the general consensus when discussed in past around here. Which is why upgrading the fuel system has been recommended for years now.

We know the stock LT1 fuel system is good to 550whp on an honest dyno. Add a bigger fuel lobe cam will net another 100whp of fuel headroom on the high side. The cam is going to make the extra 100whp without increasing boost, so you are always up against the LT1 fuel systems limits...hence why nobody runs it on a DI only setup with boost.

So, I will assume there must be a shortage on fuel system components, because I don't really see Brett recommending this setup. Had to be a "make do" situation until fuel system parts show up.

The problem with “yo dawg my car made XXX HP on stock stuff” posts on social media is you don’t get the full story. That car probably has 6.4 ms IPW at 5800 RPM but because it has forged pistons and a lower CR…he got away with it. Doesn’t make it a good idea.

[Sillysspeed]

I have the lt4 fueling with jms and low side is great on e50. High side doesn’t want much more. Tuna said could add the +30 or 65 injectors would help a bit but next best step is the cam with big fuel lobe. Just cant bring myself to tearing into a car with 1600 miles on it

[adamjwilson]

Originally Posted by Sillysspeed

I have the lt4 fueling with jms and low side is great on e50. High side doesn’t want much more. Tuna said could add the +30 or 65 injectors would help a bit but next best step is the cam with big fuel lobe. Just cant bring myself to tearing into a car with 1600 miles on it

Ah…. Just take the leap and tear into the motor. I did it with less than 700 miles on mine… its not for the faint at heart

[KingLT1]

Originally Posted by Joshinator99

The problem with “yo dawg my car made XXX HP on stock stuff” posts on social media is you don’t get the full story. That car probably has 6.4 ms IPW at 5800 RPM but because it has forged pistons and a lower CR…he got away with it. Doesn’t make it a good idea.

Agree

Originally Posted by Sillysspeed

I have the lt4 fueling with jms and low side is great on e50. High side doesn’t want much more. Tuna said could add the +30 or 65 injectors would help a bit but next best step is the cam with big fuel lobe. Just cant bring myself to tearing into a car with 1600 miles on it

Injectors won't gain much without bigger high side pump. I have XDI +30 and LPE HPFP. It definitely gained some fuel headroom over LT4 stuff (about 30%), but I am still high side limited. The pump really needs a bigger fuel lobe to drive it. +65's would be an absolute waste without the LPE pump and bigger fuel lobe. The LT4 hpfp is not ideal combined with +65's because they do not like pressure above 2600psi. LT4 stuff operates at 2900+ PSI, LPE/LT1 stuff operates at 2175 psi but can be cranked up some(2500psi).

[ShockingZ]

Originally Posted by Joshinator99

The problem with “yo dawg my car made XXX HP on stock stuff” posts on social media is you don’t get the full story. That car probably has 6.4 ms IPW at 5800 RPM but because it has forged pistons and a lower CR…he got away with it. Doesn’t make it a good idea.

This is typical for Pray and his merry band of nut swingers. They hype him up on social media and in reality hes not doing anything close to pioneering.

[LT1ornothing]

Originally Posted by KingLT1

A LT1 car needs fuel support below that. Stock LT1 tank pump doesn't support 700whp. I am running a LT4 pump with JMS and it might have another 50whp headroom left in it on E60. My car traps 137 full weight on 20" wheels...so whatever WHP that equals. I never really cared about dyno numbers without a baseline.

Either way I have a pretty good idea what power level these cars need X fuel mods being I have tuned several of these cars from 600whp all the way to 1000whp.

Hoping Pray would stop in and give some details of the build and how he stretched the fuel system out that far. I like to pick the brains of knowledgeable folks. We used to chat about tuning off and on in the past. Now he doesn't seem to have much time for it...

King, any idea how much pump E85 the LT4 low side + JMS booster can support on a forced induction setup? I'm considering Toohighpsi port injection and leaving the stock LT1 DI injectors and hpfp alone,. I'm not shooting for the moon here, just a simple SBE e85 blower set up, 10 lbs max. I have no issues blending E60 like you do, just wanted to see if you knew where the LT4 +JMS low side setup taps out on pump E85. And as always, thank you very much.

[KingLT1]

Originally Posted by LT1ornothing

King, any idea how much pump E85 the LT4 low side + JMS booster can support on a forced induction setup? I'm considering Toohighpsi port injection and leaving the stock LT1 DI injectors and hpfp alone,. I'm not shooting for the moon here, just a simple SBE e85 blower set up, 10 lbs max. I have no issues blending E60 like you do, just wanted to see if you knew where the LT4 +JMS low side setup taps out on pump E85. And as always, thank you very much.

You can likely run full pump E up to level where myself and Laynlo is at. Then if you ever end up needing more there is a bigger drop in pump solution that works with the stock basket and retains all functionality of the stock system if you don't want to tap the tank for an Aux setup.

[ShockingZ]

Originally Posted by LT1ornothing

King, any idea how much pump E85 the LT4 low side + JMS booster can support on a forced induction setup? I'm considering Toohighpsi port injection and leaving the stock LT1 DI injectors and hpfp alone,. I'm not shooting for the moon here, just a simple SBE e85 blower set up, 10 lbs max. I have no issues blending E60 like you do, just wanted to see if you knew where the LT4 +JMS low side setup taps out on pump E85. And as always, thank you very much.

Im in a maggie ZL1 at about 15PSI with only a JMS/stock lt4 fuel system otherwise, and I can get to e40 maybe even e50 with my current setup. Tuned by Elite tuned. e40 easily and tuner things we can stretch to e50. I have no other mods only maggie with 90mm pulley.

[KingLT1]

Originally Posted by ShockingZ

Im in a maggie ZL1 at about 15PSI with only a JMS/stock lt4 fuel system otherwise, and I can get to e40 maybe even e50 with my current setup. Tuned by Elite tuned. e40 easily and tuner things we can stretch to e50. I have no other mods only maggie with 90mm pulley.

You will run out of injector before low side. With port injection it would be the opposite.

LT1ornothing wanted to know how far the low side will go with Port Injection. Laynlo made just over 700whp with mid 12's afr before low side pressure started to drop on E70 something. That was LT1 fuel system, Port Injection, and JMS.

[laynlo15]

Originally Posted by KingLT1

You will run out of injector before low side. With port injection it would be the opposite.

LT1ornothing wanted to know how far the low side will go with Port Injection. Laynlo made just over 700whp with mid 12's afr before low side pressure started to drop on E70 something. That was LT1 fuel system, Port Injection, and JMS.

That was on 10.5 lbs of boost, we also went 9.86@142 on that setup. Now that I've sent in my TCM to get unlocked we should see a few 10ths pick up according to King and what others have done. We have decided to add a twin in tank sometime in the future, just for safety. Before we do that I wanna see how fast we can go on this fuel system. Once we do the low side we might add another smaller pulley to pick up another pound of boost but not exceed 12 psi. If we can do that we can probably run 9.50s, not sure if we can break into the 9.40s or not, but I can't take a chance with this fuel system to even try it.

[adamjwilson]

Any luck on getting Brett to come back to this forum? His rants on Facebook are getting old, and we all know he is a bigger man than that. Different clientele that respond to his posts about what he said/she said... another tuner did this and bashed me...blah blah blah... that social media platform will either make him a CHAMP or CHUMP. Damn shame because he is better than that IMO and a hellva tuner.

[asthmamax11]

I know he's adamant about customer's cars having forged pistons before he tunes them

(Boosted LT1)