Ok- I've dynoed my car, and im running nitrous on it,

I've seen graphs that pretty much show that my car is on the top of the " stock fuel system limit" line... supposedly..

Anyways- I was wondering if goin to like 28# injectors,an adjustable FPR and like a Walbro 255LPH in taknk pump would gain me more power and torque, and if so, how much approximatly? Also- what do these upgrades usually run price wise? and are they worth it or is there somethin you can do to the stock system to squeeze more out of it?

Thanks!
Jeff

 

No. Upgrading your fuel system now will not enhance your performace at all, unless you are already making power beyong what the "stock fuel system limits" are. If so, you're car is running lean at the top end of your power band and cannot make a "true peak hp rating". Upgrading your fuel system in this circumstance WILL raise your numbers because you will be fixing a problem with your car that is preventing your true potential power rating from being reached. If you are NOT at your "stock fuel system limit", you will not get any performance increase from upgrading your fuel system NOW. What you will do is prepare your car very nicely to make more power in the future, when it needs the extra capacity. Think about your fuel system in the same respect as any other non-engine mod. Intake, exhaust, cooling, braking, suspension, tires, tuning; these are all mods that have very little benefit on a STOCK engine, but give increasing returns as your power level increases. A HO intake and headers on a stock engine will not yield a huge gain in HP, because the stock engine doesn't NEED them. A 500 hp engine will suffer if forced to breathe through stock intakes or exhaust manifolds, it NEEDS an HO intake and headers. If your engine NEEDS a larger fuel system and you don't give it what it needs, all you're doing is castrating your car. HP only only goes up when your engine becomes more efficient at doing what it does, burning gas. Starve an HO engine of fuel=watch your HP increases come to a screeching stop.
I looked into www.performanceplumbing.com 's web site when I was considering a fuel system upgrade, and I was very pleased with the customer service I recieved. They have everything you need to run braided stainless line from you tank to your fuel rail ( the 5808 fittings fit on the tank as well as the fuel rail, two sets necessary). I looked into them because of a lead on this website and because I didn't want to pay Aeromotive's prices. I'm very pleased with how honest and friendly they are on the telephone, and their prices are great.
Upgrading your fuel injectors is probably the easiest part. There's plenty of sites that have hp requirement/injector sizing calculators. Just google injector sizing, throw your numbers at the calculator and voila, instant gratification. Ls1 injectors are 26# and probably not what you're looking for with a max-effort engine. If they are, there are plenty of companies that will sell you a set of 8 flow-matched take-offs for 100-200 bucks. If 30 or 36# will do it for you, pick up a copy of MM&FF magazine and get you some Ford injectors for your Chevy. If you look online or on ebay, you'll probably end up paying more for used SVO injectors than you would for new ones from the dealers that advertise in MM&FF. Just a tip. Also, Fords tend to run a lower fuel system pressure than GM's do, so look at the psi differences that the injectors are rated at before making your purchase. Don't buy blind, and don't overpay.
Lastly, get a good tune. Your engine will thank you later on in life. I didn't mention an aftermarket fuel pump because I've never needed one. The stock piece has held on to 400rwhp, and I will always have room on my car for a well-engineered AC Delco part. If you need an aftermarket fuel pump, Barry Grant or Aeromotive would be happy to send 1000+ gph at your engine with a single phone call!!!
Good luck with your car. Always remember, a well-researched and properly put-together combo will always beat a bunch of high dollar parts that's just thrown together.

 

Although you won't gain any power, it's probably time for bigger injectors. Yours have got to be working their *** off to keep up at high RPM. I'd get a set of the Ford 30lb injectors.

Don't buy Take-off LS1 injectors. Although they are rated at 28lbs, thats at 60psi. At the 43psi the LT1 runs, they will be pretty close to the 24lb injectors you have right now.

 

Well- if i upgrade the fuel system i was planning to have the computer re-tuned. See the problem in my area is that NO ONE does a "tune" all the shops do is '' tuneups"... I would have to send my PCM to PCM's For less and have them program it.. when i dynoed it the torque and hp curves look exactally the same on motor.. they follow eachother along nicely.

However- i think that a new set of injectors, and a fuelpressure regulator might be nice upgrades ?

 

I was kinda thinking that its probably time for new injectors anyways- the ones in it are the factory ones!

what ford injectors should i get?- I agree that a set of 30# injectors would probably do my car pretty good..


Also- Someone had said somethin to me about " hotwiring" the fuel pump, like - replacing the positive wire with a 10 ga wire instead of the stock wire to allow more voltage to flow it?

anyone ever heard of this?

 

Looking at you number in the sig I think it would be a very good idea to get at least injectors. If you have access to a logging tool you can calculate your injector duty cycle and see how hard you are pushing them. When you have smaller injectors you have to keep them open longer to deliver the same amount of fuel when compared to a larger injector, when this happens you take the chance of having fuel puddle on the back of the valve. Obviously this isn't the best scenario for making effecient power. With that said, I think that you would gain power by switching to a larger injector and having the PCM tuned accordingly.

 

And i think that i agree with you and that is deff. what i need to do..

lol..

 

This would only help if the individual car had problem with the electrical fuel system wiring before this was done.
Increasing the wire gage size does NOT change or effect the voltage in any way. What it will do is allow greater amperage draw at the pump. But only if the stock system is under size, which it is not. Also you have to increase the wire size though the entire system, not just at the pump.
If you install an aftermarket pump with greater amps requirement then stock, then you NEED to upgrade the wiring to accomodate the new pump. Doing this on a stock system will do nothing.

 

K, i will not waste my time then.. lol..

Appriciate it!

 

Just order the whole deal from Racetronix. Fuel pump, harness, and injectors. Forget the adjustable regulator as most of them are garbage anyway. And don't forget to change the fuel filter while you're at it.

 

whats a setup like that run?

Low on $ right now.. lol

 

Straight from Thunder Racing.

135-INJ-621037-8
Delphi/Lucas 37# High Impedence Fuel Injectors
$332.99

135-FLT1-FPK2 Racetronix Fuel System w/ 255 LPH High-Pressure Fuel Pump and Series II Plug-&-Play Wiring Harness (includes chassis ground & booster pump plug-&-play option), LT1 F-body
$249.95

 

Ok- Thanks a lot man!.. i dunno if i need to go with the 37# injectors though.. lol.. but as far as the fuel pump stuff- that seems like a great price..

 

They're just good injectors. A few of my friends are running them in 383s and they idle nicely and provide enough fuel for most street cars.

 

yeah, but i think that a set of 30's would be great for my application.. goin from the stock 24's to those should make a big difference..
also- my car gets ****ty mileage already, i dont need to get SUPER ****ty.. lol