[GirlyNFG]

Mine doesn't count?

[shrubby]

Originally Posted by 1LE801

That's a high number on 6 lbs. What else has been done?

Stainless Works headers and exhaust, Roto-Fab CAI and custom tune with Magnuson SC.

That's nothing. Check out http://www.camaro6.com/forums/showthread.php?t=467569

[Gmanuel]

Originally Posted by GirlyNFG

Mine doesn't count?

Your sig says you have lt4 hardware and then high pressure pump and injectors. So you have high and low pressure side upgraded, and are able to run full e85 at 800 wheel? Does the cam have the larger fuel pump lobe? Those are some awesome numbers. Stock bottom end?

[1LE801]

Originally Posted by shrubby

Stainless Works headers and exhaust, Roto-Fab CAI and custom tune with Magnuson SC.

That's nothing. Check out http://www.camaro6.com/forums/showthread.php?t=467569

8.5 lbs. thanks for the link. HP is superb. Torque is a bit lower than mine. Interesting to see the difference.

[GirlyNFG]

Originally Posted by Gmanuel

Your sig says you have lt4 hardware and then high pressure pump and injectors. So you have high and low pressure side upgraded, and are able to run full e85 at 800 wheel? Does the cam have the larger fuel pump lobe? Those are some awesome numbers. Stock bottom end?

I do have LT4 injectors, HSFP, springs, pushrods and lifters. Cordes LSFP... yup. My cam is 30% larger fuel lobe. I recently added a alky control meth kit because I was still out of fuel. I am still running out of fuel at about 6700 rpm.

Totally stock bottom end, clutch, axles... for now. Considering building the bottom end before it breaks. LOL

[wnta1ss]

Originally Posted by GirlyNFG

Totally stock bottom end, clutch, axles... for now. Considering building the bottom end before it breaks. LOL

Considering a stock M6 with slicks broke an axle and you have roughly double the power of a stock car going to your slicks, might want to order the good parts now...

[EDFHOBBIES]

Recap it for me... on the fuel system..

my wife's car was the one chosen as the Borla ATAK prototype and Eldelbrock's ad car on All Girls Garage..

Question. . We have a set of headers from borla that they gave us aswell we wanted to do a different tune and the headers and try to pick up some more power but what is the fuel system good to on 93 and or e85.

Don't want to do those things if we would have to fuel work to..

What is a pick up tank pump? Is that more or less a pump to feed the injector pump.. if I understand it correctly the system is similar to a diesel setup now that work on pressure near 1000 psi and there is a special lobe on the cam that pushes that pump?

Are most people doing a LT4 cam or another grind with better pump lobe?

Eldelbrock claims 580 to the wheels. Waiting for it to cool off and then will see if that's even close.

What's the cost of the pump?
I imagine a cam swap is close to 3k?

[Gmanuel]

Originally Posted by EDFHOBBIES

Recap it for me... on the fuel system..

my wife's car was the one chosen as the Borla ATAK prototype and Eldelbrock's ad car on All Girls Garage..

Question. . We have a set of headers from borla that they gave us aswell we wanted to do a different tune and the headers and try to pick up some more power but what is the fuel system good to on 93 and or e85.

Don't want to do those things if we would have to fuel work to..

What is a pick up tank pump? Is that more or less a pump to feed the injector pump.. if I understand it correctly the system is similar to a diesel setup now that work on pressure near 1000 psi and there is a special lobe on the cam that pushes that pump?

Are most people doing a LT4 cam or another grind with better pump lobe?

Eldelbrock claims 580 to the wheels. Waiting for it to cool off and then will see if that's even close.

What's the cost of the pump?
I imagine a cam swap is close to 3k?

The tank pump is the low pressure pump that port injection cars use. In the case of DI cars, in tank pumps are used to feed the high pressure pump. The LT1 uses fuel pressure in the neighborhood of 2100 psi. There is a lobe on the cam that drives the high pressure pump, and people are getting cams with larger lobes, in order to overdrive the HPFP (high pressure fuel pump).

The in tank pump is not that expensive, it's a port injection pump, after all. The high pressure side of things is where it gets expensive (HPFP, injectors).

[EDFHOBBIES]

Originally Posted by Gmanuel

The tank pump is the low pressure pump that port injection cars use. In the case of DI cars, in tank pumps are used to feed the high pressure pump. The LT1 uses fuel pressure in the neighborhood of 2100 psi. There is a lobe on the cam that drives the high pressure pump, and people are getting cams with larger lobes, in order to overdrive the HPFP (high pressure fuel pump).

The in tank pump is not that expensive, it's a port injection pump, after all. The high pressure side of things is where it gets expensive (HPFP, injectors).

We talking dropping cradle and fuel tank like in the 5 gen to mess with pumps? If so 4 to 500 labor and 200 maybe for the pump?

[Gmanuel]

Originally Posted by EDFHOBBIES

We talking dropping cradle and fuel tank like in the 5 gen to mess with pumps? If so 4 to 500 labor and 200 maybe for the pump?

That I'm not sure about. With my last car, the pump assembly was accessible by lifting the bottom portion of the rear seat, and unscrewing a cover.

[EDFHOBBIES]

Mustang?

[Gmanuel]

Turbo 3 series. If only it was a Mustang, then at least it wouldn't have had something break every other month.

[jessrayo]

Originally Posted by EDFHOBBIES

Recap it for me... on the fuel system..

my wife's car was the one chosen as the Borla ATAK prototype and Eldelbrock's ad car on All Girls Garage..

Question. . We have a set of headers from borla that they gave us aswell we wanted to do a different tune and the headers and try to pick up some more power but what is the fuel system good to on 93 and or e85.

Don't want to do those things if we would have to fuel work to..

What is a pick up tank pump? Is that more or less a pump to feed the injector pump.. if I understand it correctly the system is similar to a diesel setup now that work on pressure near 1000 psi and there is a special lobe on the cam that pushes that pump?

Are most people doing a LT4 cam or another grind with better pump lobe?

Eldelbrock claims 580 to the wheels. Waiting for it to cool off and then will see if that's even close.

What's the cost of the pump?
I imagine a cam swap is close to 3k?

As Gmanuel said, The fuel system has a low pressure side and a high pressure side. The low pressure side keeps your fuel line pressure and the high side delivers your injector pressure. There is some leeway in the system but if you need a lot more fuel you need both.

I know that many other folks are not doing it this way but I am of the opinion that you should upgrade the low pressure side fuel pump first. I think you need to have an in tank system that is going to maintain constant fuel line pressure at whatever horsepower level you plan to run the car at. Many builders have proven that an upgraded high pressure pump will "draw" more fuel out of the existing tank pump. When you upgrade the in-tank fuel pump you need to talk to your builder and say I need an in tank fuel system that will deliver x number of horsepower because no matter how much you upgrade the mechanical pumps you still need a pump that will lift the fuel into the fuel line and hold the fuel line pressure. My current tank pump will deliver 1000whp worth of fuel to an LS motor. It can maintain line pressure by itself to 1000whp. When I added this system (about $1000) I was able to get 90 more whp out of the stock mechanical pump system because it had much more fuel line pressure. A little boost a pump system will help but in my opinion it is not the best way to go.

There is a different mechanical pump in the LT4 than the LT1. I'm going to try to attach a picture of it when I finish this post. You can get that pump for about $850 and it significantly increases the injector pressure all by itself. Everyone I know that installs the LT4 pump installs the LT4 injectors because they have more capacity. I'm getting this done to my car right now as I'm typing this. This can be done without cracking the motor and messing with the camshaft. The fuel lobe on the LT4 camshaft is basically the same as the fuel lobe on the LT1 camshaft. The difference in the stock motors is the pump. There are however, several camshafts available through the aftermarket that have more lobes and taller lobes interacting with the fuel pump and some venders are saying they can pump twice as much fuel with better cam lobes. I have not gone to a new camshaft yet. I'm fairly certain that when I do I will install lower compression pistons and complete forged crank and rods.

Your fuel system is probably pretty maxed out as it is right now. If you add headers you might make a couple more hp with increased efficiency but it really needs more fuel. I would go with an in tank system first and don't go cheap. Then you can add the headers and a larger pulley on the supercharger and get another 90 to 100 whp out of it.

E85 is a double edged sword. It is great because it has extreme knock resistance which we need with the high compression of this LT1 engine....but it takes 30% more fuel than gasoline to make the same amount of power and obviously getting 30% more fuel into this engine is a little more complex.

[AndyUK]

Excellent info Jess, thanks.
What in tank pump did you go with?
When you say you added 90hp with just the pump, what were the before and after figures like?