The quest for power.

LaserSVT

LaserSVT

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Since at some point I plan on adding a stroked and forged bottom end and then cranking the boost up to double what its at I realize the fuel system will need attention.

I will upgrade to 60lb injectors in anticipation of 550+ RWHP but the pump is my weak point. Cant get more then a 255 for the tank and I havent seen a cage that can hold two pumps like they make for Mustangs. I dont think a single pump can handle that power level. So whats the alternatives? I have never heard a quiet inline pump but even if there is a quiet one, how do I run it? The driver cant handle two high output pumps and I cant just have it run on/off cause at lower throttle the pump may drain the tank pump and cause issues.

So looking for ideas.

The other question involves the heads. I know they flow like crazy but the valve springs are my concern. Running low to mid 9's on the CR with 17psi will put a strain on them but I also want to spin the motor to 7k+.

Can the stock beehives handle that? Its another $400 for Comp springs then another $400 for titanium retainers and then another $100 for the valve spring tool. Id like to avoid that extra expense if its not needed.
 
Car runs perfect...if it ain't broke don't fix it.
 
I have two 255s in my tank and 80lb injectors. Currently my lines seem to be the restriction. Past 16psi it just starts to lean out no matter what I do in the tune.
 
The '03-'04 Cobras have dual pumps stock, driven by a single FPDM and that stock fuel hat may fit our tank. I've got one, but unfortunately didn't think to check if it would fit when I changed the pump in my LSC a while back.

I've also been thinking about the possibility of adapting the Fore fuel pump hats to the stock tank, as the mounting arrangement appears to be the same. Cobra owners sometimes add a second FPDM, we could probably do the same thing. There's a kit available HERE.

As for the springs, Comp also makes steel retainers (799-32) that are less than $100 for use with their 26123-32 springs. And you'll need two valve spring tools, they're different. I own them both, so I could rent them to you if need be. ;)

ValveSpringTools.jpg
 
I modified the factory hanger to hold two pumps. Then I ran a second line out of the hanger and "Y" it into the factory fuel line. On the wiring side- I ran a new power wire to a new relay back by the tank then i used the Factory power wire as a trigger wire for the relay.
 
MercuryLs said:
I modified the factory hanger to hold two pumps. Then I ran a second line out of the hanger and "Y" it into the factory fuel line. On the wiring side- I ran a new power wire to a new relay back by the tank then i used the Factory power wire as a trigger wire for the relay.
Click to expand...

The Gen 2 fuel system is a little different than the Gen 1 fuel system, it uses a FPDM to power a modulated fuel pump, similar to the returnless system used on the '03-'04 Cobra's.
 
If I was going to a crazy setup I would do dual pumps all new line from front to back with billet fuel rails and I would hard wire the pumps... get rid of the FPDM entirely.
 
I do plan on running larger feed lines because I can see the stock would be a restriction. I dont think I will replace the fuel rail though because I do not believe I can fit a Billet one on the passenger side. The blower makes for many space restrictions.

As for the Cobras, if memory serves they have a higher amprage fuel pump driver but should still swap out easily enough. I dont think a Cobra fuel cage will work though. I think their setup hangs from the hat and that would leave them just hanging too high in the tank. I could be completly wrong on that though.

Gonna do some research today on that front.


As for the spring compressor, yeah that kit was $100. If I do springs then I want to own my own tools for future work.
 
Car dont run perfect. Perfect would mean I dont have to fear almost any car I see. I wanna see some of them ass hats that run around with their modded GTOs and last gen F-bodies that think they are top chit get their doors blown off by an old Lincoln. :)
 
I guess I haven't been keeping up on current events, but weren't you going to sell this car about two weeks ago? Between you and Jamie, I can't keep up. :p
 
kustomizingkid said:
I'd start to worry about everything else with the car after you get above 400ish hp...
Click to expand...
My only worries af the power level I want is the trans. I dont think it will last all that long. Everything else should be ok. Ill have to get some DLF bushings for the rear but I think thats about it.
Right on the Mark said:
I thought you where selling the car??
Click to expand...

I am! I want the next owner to have a really bad ass car! :lol:




JK :p
 
I make about 550+ at the crank and I run dual red Armstrong intanks now. I had two 255's one got unhooked during installation so I was doing alot of wide open pulls on one pump and never went lean till the gas level got really low. It takes a little customization on the fuel level sender and the slosh basket but it can be done. I think you can be safe at 400-450hp on one high pressure 255

I have two 12 gauge wires go to the pumps from the power block that runs the stereo. I use the old fuel pump power wire to trigger a relay to power the dual pumps

here are my pic's of my hose diagram I got rid of #9 an got straight to -8 back to the tank.
attachment.jpg



version 1.5 of intank hat (Dual -6 send -6 return)
DSC00847.jpg


Version 2.7 of intank hat (single -10 send single -8 return)
68037.jpg

68038.jpg


Heads ... I can talk for hours on heads, cams, springs, etc.
 
The fuel relay setup you are doing has me wondering. Relays usually are not good for rapid and constant on/off duties. Dont our fuel drivers rapidly switch power to controll pump speed? If they are now telling a relay to switch many times per second wouldnt that wear out the relay fast? Also wouldnt that cause lag issues?

I will have to look into doing what you did with the hat and then just add on a Cobra pump driver.
 
LaserSVT said:
The fuel relay setup you are doing has me wondering. Relays usually are not good for rapid and constant on/off duties. Dont our fuel drivers rapidly switch power to controll pump speed? If they are now telling a relay to switch many times per second wouldnt that wear out the relay fast? Also wouldnt that cause lag issues?

I will have to look into doing what you did with the hat and then just add on a Cobra pump driver.
Click to expand...

I run a dual relay setup, one relay for each pump. The FPDM voltage output variation (10.2v - 13.7v) is not enough to switch down the realys (9.5v). So when I turn the car on the relays are live, til I shut off the car.

no need for a cobra driver, the stock lincoln one will be more than enough to trigger relays. No need to make things more complex (I do it all the time)
 
Why I was saying get the Cobra is because of its higher amp capacity. I dont want the pumps to run wide open all the time.
 
LaserSVT said:
Why I was saying get the Cobra is because of its higher amp capacity. I dont want the pumps to run wide open all the time.
Click to expand...

if the pumps are designed to run at 100% all the time, then why not? A cobra driver adds complexity to the install, wiring and programming
 
If the pumps are designed to run 100% all the time then why does the fuel pump driver need to be in the car to vary their output?
 
Fuel System Upgrade

LaserSVT said:
Since at some point I plan on adding a stroked and forged bottom end and then cranking the boost up to double what its at I realize the fuel system will need attention.

So looking for ideas.
Click to expand...

Instead of placing here what I put into my thread yesterday, please see the latest information regarding fuel systems in 'Land Speed LS' in the performance section.

KS
 
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