I need to piece together a fuel system for about 700 extra RPM.

[Kdubslugga]

Here's my story.. My mods are below, and I begin to run lean at 5500 rpm. AFR is 11.9 at 5500 RPM but on the rise. Now these runs on the dyno were with stock fuel lines, stock fuel rails, a 255 lph in tank pump and an Anderson Big Pump inline pump, along with 50lb injectors and a 1:1 AFPR. Im not wanting to rev this thing high, Id like to be around 62-6300 RPM, and Id hate to spend 1500 to 2000 grand on a fuel sytem for just a few extra hundred RPM. Im just wondering what will get me there? Or what should get me there. I have Aeromotive rails ready to go on and Im thinking about adding some bigger aluminum fuel lines. Do I need another inline pump or intank pump to reach my goals? Any help on this is appreciated because I dont know fuel systems well.

 

[2000xp8]

Obviously every car is a little different, But, I've seen cars at 515rwhp with 42's and the gss340 intank pump, that were fine up to 6200.

 

[FastDriver]

Does the anderson "big pump" increase the output of the 255 you have in it? If not, then you might consider that kennebell boost-a-pump.

That's the only answer to the question you asked that I can think of. That said, I wouldn't run an ounce more RPM than you already are, bro. You're are at the upper end of the limit of the stock block. Keeping AFRs where they are, the power that your making where it is, and RPM where it is (5500 rpm), are the keys to keeping your motor alive. I think running any additional RPM is a big mistake, and is not worth the trade-off in risk. Your money, your car, so do whatever you like, of course. But be happy with where you're at, bro. getting greedy is expensive.

 

[RacEoHolic330]

FWIW, my 42lbers were at 98% DC at 5800 rpm. That was with 528rwhp. I had a 255gph intank and a Vortch inline. An inline pump may help you, and they aren't hard to install, but I agree that you are on think ice with that block depending how much you beat the car.

 

[Kdubslugga]

Yeah I didnt plan on making over 500 horsepower to the tires, which is why I went with the DSS prepped block. My addiction set in and now it's never enough. Sorry it took me so long to respond, ive been super sick the last few days i havent felt like doing anything. 5500 RPM comes aweful quick in a boosted stroker lol.

 

[RacEoHolic330]

My addiction set in and now it's never enough.

Words to live by!

 

[FastDriver]

You're talking to a guy with a boosted stroker. I know what you mean, but this is just a really bad idea, and I'm trying to be a friend by talking you back to your senses. Your motor is on the ragged edge. IMO, you're trying to push it over the cliff.

 

[2000xp8]

I know what you mean when you say 5500 comes so fast.

Just back everything down a bit and bring the max hp under 500rwhp at 6200rpm.

Hp gains and losses matter by percentages, so losing say 20rwhp out of 500 is only like 3% of your power. That's like adding underdrive pulleys and a K&N filter to a stock engine.

So, you are risking your engine for nearly nothing.

With good heads and an S trim, it's pretty easy to exceed 500rwhp, happens at my buddies shop all the time, what i think they do to take out a few hps is pull some timing, but don't quote me on that, i will ask them today for you.
What i do know for sure is that they back them all down.

 

[RacEoHolic330]

Timing is typically the easiest way to tone down a combo. When tuning for max hp, tuners will typically keep raising the timing until there is no more power gain. Then they back it off a degree or two to prevent detonation.

 

[FastDriver]

You guys are right on the money, but even at 500rwhp it shouldn't be seeing 6200, IMO. Even a turbocharged combo, which is easier on everything at that power level to the wheels, shouldn't be pushed that hard, IMO. At that RPM, I'd personally want to pull so much timing that the motor would be putting out in the neighborhood of 400rwhp, and at that point, you'd be better off shifting into the next gear anyway.

 

[Kdubslugga]

Ive thought about putting a bigger pulley on the blower to lower boost levels and help with the fuel starvation. I dont even need 6200 rpm, 6000 would work fine. I cant make a full pass at the track with a rev limiter set at 5500 im out of rpm at about the 1000 ft mark. Maybe just a tad past it.

 

[2000xp8]

Where is your power curve actually going at 5500 rpm? Still going up? Tapering off? Going down?
If you need more fuel, i'd assume it's still going up, even more reason to take it back a notch, up is not a good place at your level.

Not sure if you have ever blow up an engine, but it's not really a good feeling, there is a super big bang and feels like you blew out the trans, then it's coupled with the lack of power steering, and just hope you don't run over any engine parts that you just broke (which does happen).

 

[Kdubslugga]

Dyno shows no signs of leveling off. lol. The tuner said it easily has 530rwhp in it if i were to go to 62-6300. Anderson Ford has tuned my car twice. To be honest I had no idea the combo would work so well. Youve got me looking up Ford Racing Boss 302 blocks now. GREAT!

 

[2000xp8]

Dyno shows no signs of leveling off. lol. The tuner said it easily has 530rwhp in it if i were to go to 62-6300. Anderson Ford has tuned my car twice. To be honest I had no idea the combo would work so well. Youve got me looking up Ford Racing Boss 302 blocks now. GREAT!

Don't get yourself started.
You will quickly realize you are going down a 10,000 dollar road.
First it's the shortblock, sure to cost you 4 grand, then there is the fuel system for 2k, then comes the T trim.
Car isn't going to be 10k more fun than it is now.

 

[FastDriver]

Couldn't have said it better. 500rwhp really is the happy place with a fox, man. If I ever started over, and I might, I wouldn't do again what I've already done. I know you feel like you've put a lot of money into your car. If I did it again, it would be a stock shortblock w/ heads & intake with a cheap turbo kit pushing 500, and tuned by me using a piggyback for the motor. 5 lugs, brakes, and a T56 tranny. A boy can dream can't he?

but the mod bug bit me as bad as you, and when I blew my motor up, I lost my mind. Now I have 3.5 times as much money invested as I did, and that's about to be 5 times as much. To add to the insanity, I'm not sure I like my car as much as I did when it was simple and cheap.

And don't worry bro, 500rwhp in a fox is monstrous by comparison to 500rwhp in just about any other car. You ought to be trapping in the mid 120s to low 130s. That will still smack down just about any production car out there, and most modified cars to boot.

 

[FastDriver]

I cant make a full pass at the track with a rev limiter set at 5500 im out of rpm at about the 1000 ft mark. Maybe just a tad past it.

Easy fix with gears and/or tires, bro.

 

[Kdubslugga]

All really good points guys! Thanks for all the help and yes, its not worth 10k for a little bit more HP. And right now Im trapping 124 mph, but that was with a cobra intake and not a systemax, plus hitting the rev limiter at the 1000 ft mark. Maybe less boost, and some 3.55s will make me happy. This is why im not married! lol

 

[Rick 91GT]

You're talking to a guy with a boosted stroker. I know what you mean, but this is just a really bad idea, and I'm trying to be a friend by talking you back to your senses. Your motor is on the ragged edge. IMO, you're trying to push it over the cliff.

Great Quote.....

IF YOU MUST CONTINUE TO MAKE MORE POWER.... I'd add the rails, (although I hate the Aeromotive dump return in the middle of the drivers rail) I think you have enough pressure but your losing volume in the stock rails with the large injectors. Typically this is the first thing I see, then the need for lines and a backhalf fuel system.

Crank it up then call me for a DART BLOCK