Darkstar632

Looking for some help finding the best place to buy a walbro 255 intank direct fit for the ls1 and 36-39 lb injectors ( don't know which ones looking for recommendations leaning twards the fast for now) any input guys ???

Darkstar632

And someone needs to educate me and correct me if I'm wrong... The stock 190 lph pump will run the fuel pressure to 43.5??? What will the walbro run the fuel pressure to?

Lonnies Performance

iTrader: (16)

I have no idea what you are working on, so I cannot answer your questions.

Call me to discuss in more detail & I can set you up with the proper pump & injectors for your application.

Darkstar632

I will be giving you a call Lonnie either later today or tomorrow... I just was looking to find the best price on the walbro pump that utilizes the jet pump http://www.ws6project.com/user_stor/...fit-fuel-pump/

And just wanted some general opinions on best injectors between 36-39 lbs most bang for your buck

When I use the injector sizing calculator (http://www.rceng.com/technical.aspx#...tor_Worksheet_) 500 crank hp/8 injectors/.50 brake specific fuel consumption/ 80% maximum duty cycle / 43.5 lbs of fuel pressure @ fuel rails it says I should use 39.5 lb/hr injectors ....I want to know if that 43.5 psi system fuel pressure number will increase with the walbro pump and what number it will change to so I can re-enter the new psi into the calculator to determin which size injectors to buy, then which brand to buy

Here are my mods list

2002 Firebird trans am ws6 90k miles

-Slp air lid k&n filter ram air
-Slp MAF
-Stock ported tb with ls6 intake
-Ls2 water pump
-Ls2 timing chain
-Ls6 ported oil pump
-160* thermostat
- A/C delete
-Cam- texas speed ms3
Adv/dur 287/291
Dur @ .050 238/242
**Lobe sep 110**
Valve lift .605/ .610
-Heads-- PRC double titanium .650 valve springs, ls2 lifter trays, ls7 lifters, titanium retainers seats and seals, texas speed chromoly pushrods
-Hooker headers custom 3" piping w/ electric cutouts and borla muffler
-Monster stage 2 clutch w/ 18lb billet flywheel
-Tic performance adjustable master cylinder
-Moser 9" 411 gears
-Texas speed ecu mail in tuned

Will be adding heads to match the cam and fast 92 intake/tb by end of winter


Thanks for the help Lonnie !!

Lonnies Performance

iTrader: (16)

Your car runs at 58psi, not 43.5

Essentially injectors rated at 43.5psi (also known as 3 bar) flow 15% more at 58psi (also known as 4 bar).

36's are 41.5 at the higher pressure. Injectors that are slightly too large are not a problem. A true 36 or 42 injector at 43.5, will be OK. Be careful of the pressure ratings as some (FAST for example) rates the LS injectors at 58... otherwse you will not get the flow you think you are.

Give me a call, I can set you up with the pump & injectors you need.

ZL1Killa

iTrader: (17)

hit Lonnie up!!