Bama99z

iTrader: (7)

Ok guys here is my delima, I am trying to finish up my engine build and het it installed. I have built a 6.0 and will be running TFS 235 heads with about 11:1 CR. Fast 102 with a 102 TB and a 100mm MAF and 60# injectors. I am hoping to be a little over 500hp. What size fuel pump and system to I need to be looking at to allow me to have the proper fuel pressure and flow? I have been looking at the Racetronix 135-RFPK-001 and adding the upgraded battery ground and booster and pump booster controller kit.
https://www.texas-speed.com/p-2358-r...ic-system.aspx

I am currently not running type of power adder. I may in the future though.
Is this system adequate or do I need to be looking at something else totally. Also I have heard the with some aftermarket fuel pumps the fuel bucket need to be modified. Will this require any modification?

Ollie8974

The Racetronix is a direct replacement requiring no modification to the bucket.
Fuel Pump Assembly FPA-001A Good to 600 HP.
Scroll to bottom of page.
http://www.racetronix.biz/items.asp?...atus=0&Tp=&Bc=

Old Geezer

iTrader: (3)

https://ls1tech.com/forums/fueling-i...ump-chart.html

NuckenFuts

Im also trying to figure this out.

From those links it says to take 60lb * .80 (duty)=46/.5=96HP * 8 injectors gets you HP good to 768 with 60lb injectors?

Can anyone confirm I'm doing this right and would 42Lb injectors work just fine for a 500HP motor as he said? 42*.80=33.6/.5=67.2*8=537.6 HP?

No clue on fuel pump as Im also looking for answers for something like your build. Why did you go with 60# injectors?

Russ K

iTrader: (1)

There is nothing wrong with going over 80% IDC. I've seen stock vehicles exceed that number. I've hit 98-100% IDC in my cam/head 2001 ZO6 for years without any issues. Now I have 36 lb/hr Fast injectors (41 lbs/hr @58psi) in my 418 stroker that hits 85% IDC. And my stock fuel pump maintains 56 psi @7000 rpm at WOT.

The 80% IDC rule is published by injector suppliers to sell more injectors to people that don't need larger injectors. You don't make more power with larger injectors if your IDC is <100%.

Russ Kemp

Bama99z

iTrader: (7)

Ollie8974 Man thanks for the info, one of concern's was that I didn't want to have to modify my factory fuel bucket. What fuel pump are you running?

The reason that I am going with the 60lb injectors is because I have a good friend that has a pratically new set ( less than 2 weeks old ) that he installed then removed from a customers car that decided to go back to stock and trade his car in on a new one. One of those cant pass up deals if you know what I mean.

Russ K thanks for your input, but as far as fuel requirements and injector stuff I am lost. Thats why I posted up? Sounds as if you are more schooled in it than I am. What are your thoughts on the fuel pump that I have selected?

Russ K

iTrader: (1)

Before spending money on a fuel pump you might not need, plus the effort to drop the tank to swap the pump, I would tape a fuel pressure gauge to the windshield. Then go WOT til redline, if the pressure drops below~55 psi, you need a higher output pump. Make sure to replace the fuel filter first.

That Racetronix pump kit is more than enough, and is probably not needed for your power level. I still have the OEM pump in my ZO6.

Russ Kemp

Bama99z

iTrader: (7)

Russ, thanks for your insight. However I am not at liberty to test my factory pump as I dont have the new motor in yet. I was wanting to install the new pump while I am installing the new engine as well. Ive talked to a few different people and they say that the factory fuel pump is iffy considering my power goals. And in the future if I do install NOS it will not be enough.

Lonnies Performance

iTrader: (16)

As an FYI, the Vette fuel pump flows more than an F-body pump so your comparison may not be valid.

Normally the f-body pumps get to about 450rwhp, give or take a little.
When you get around this level, I recommend the Racetronix kit.

ZL1Killa

iTrader: (17)

I do not believe the "published" part, however, that may be true, but I will tell you this:

if you have a dirty injector / old injector and you stay in the 95~100% duty cycle range you are risking losing an engine. I have witnessed this twice so far. We have done all the troubleshooting down to every component, and we go back and look at the data log and see 100%+ duty cycle and check everything, and it came down to the injectors.

Why risk killing an engine with a not so expensive upgrade? I just don't get it. Either upgrade or make damn sure your fueling system has new filters & injectors are clean.

a single 255 pump will net you enough fuel supply for 8 x 51# injectors, if your engine requires more fuel than this, you will start noticing a drop in fuel pressure with those 60# injectors.

On a Naturally aspirated engine 675HP will require SMALLER injectors than a boosted application. That is why the 42# seems to be the number you come up with.

If you go boosted, those injectors (60#) will carry you depending on how much boost you run & power you make. Those injectors are likely rated 60# @ 43.5psi which at our 58psi rail pressure are actually 69# injectors.

boost a pump...don't bother. Seen many failures/issues with these over time.