koolaid_kid

iTrader: (21)

Please explain. On this thread https://ls1tech.com/forums/showthrea...21#post6310421 Gizmo is stating that he got 500 hp from 24 injectors. I went to the calculator and it stated that 24s would support 307.2 hp.
I plugged in 36 for my turbo and it came up with 384, which is what I got when I had the 36s in my car.
Can someone please explain? I am confused.
Thanks.

brad8266

iTrader: (23)

24's will never cut it for 500RWHP.

Dont listen to everyone on the Internet.

koolaid_kid

iTrader: (21)

O.K., I thought I was missing something. I always try to do the math and it usually comes out for me, but he is quite insistent. The bad part is he is saying this to a new guy, and the new guy may believe him. Geez.

GIZMO

iTrader: (8)

Sorry guys, but you are the ones that need to be carefull what you read. I run IHRA Stock Eliminator. My old Camaro ran 10.50 at approx 3250 lbs two years ago at Rockingham. It went 6.57 @ 102 mph with a 1.29 sixty foot time over Christmas (1/8 th mile). It has 24 lb SVO injectors, unported LT1 heads, stock intake and throttle body, stock lift, and stock rockers.

Daren Poole-Adams
IHRA 9043

PS - You might want to check who holds the current IHRA National Record in B/FIA.

brad8266

iTrader: (23)

OK, Mods? Fuel system? Fuel PSI? How much power does the car put out?

RC Eng's fuel calculator has 500 flywheel HP, 8 injectors @ .5 BSFC, .8 duty cycle, 58 rail PSI needing 33lb/hr injectors.

Isnt RC like one of the fuel injector experts?

02BlackOnBlackSS

iTrader: (11)

That is never gonna happen safely. Maybe 500 fwhp at 100% duty cycle, but at 50 psi like stated, its very questionable to say the least. Your duty cycle should be 110+. Lets just say it won't go in my car. Plus, if your tuner can't get 30 # SVO injectors to work right, he shouldn't be tuning your car. It is not that hard to rescale a table. My 42's act the same way as the stock injectors with a simple rescale of the IFR table. The 60's I have will do the same, but will require a small amount of tweaking to minimum injector pulse tables.
Also, a lower duty cycle does not foul plugs. Plenty of people are running 60# injectors at a very very small duty cycle when not in boost. Shouldn't they be changing out plugs weekly by your assumptions?

stealth71

iTrader: (15)

Probably run 100psi to them and they could keep up.

GIZMO

iTrader: (8)

I actually run the 24's at 50 psi. The car runs 10.5's in good air @ 3300 lbs (N/A). You do the math on the HP.

sprayjunkie

You wanna really blow these guys minds? Tell them about all the other 'stock' parts on tour car, they'll be cryin BS in no time!

stealth71

iTrader: (15)

I give up GIZMO. You are the all knowing 24# monster.

I'll just stick w/ my 42's and soon to be 200 dry.

GIZMO

iTrader: (8)

Why be like that? Everything that I have done to my cars is public record.

brad8266

iTrader: (23)

Ok then answer my question that I posted . What mods do you have and how much HP does it put down?

Old Geezer

iTrader: (3)

operate at that pressure. I flow alot of injectors, and seldom see them operate, and do it consistently, at that psi.
If they are the 24# DELPHI injs, they are lucky to run at all, at 70psi...

Old Geezer

iTrader: (3)

Haven't seen the 1/4 mile MPH published, in any of your posts.
Did I miss something??

stealth71

iTrader: (15)

No disrespect, just seems like your setup is a mystery. Why don't you just inform us on how it works?

brad8266

iTrader: (23)

Thats what im saying. He says its public but wont tell mods or anything. Until he does im calling

I am curious to know how to run 500Hp with 24lb injectors.

MeentSS02

iTrader: (11)

Who knows...but one thing to keep in mind with the F-body fuel system is it has a penchant for dropping pressure under WOT, high RPM conditions. Mine routinely drops to 50-52 psi at WOT in the upper RPMs. That's what caused me to switch to 30 lb/hr injectors on my stock internal car to keep my duty cycle in check, and it still gets upwards of 75-76% (it was at 90% before with the stock injectors). If I could keep the line pressure up under heavy throttle, I wouldn't have had to up the injectors. I think that's why you see so many people putting large injectors on these cars, and why I'll be focusing on the whole system to keep that in check.

Keep in mind that the most mine has dynoed was 340/356 at the wheels...granted, that was a couple mods ago, but it is still somewhere in that area (stock internals). The 28s should have been more than enough...

koolaid_kid

iTrader: (21)

That is an interesting observation, MeentSS02. What is your pressure normally?
Is there a thread that discusses why the fuel pressure drops at high revs?

MeentSS02

iTrader: (11)

Normal pressure is about 58 psi at idle (as it should be). It ranges from 56-58 psi cruising around (typical interstate action), but get the RPMs up (even under moderate loads), and it drops pretty quick to the mid-low 50s. There have been threads in here and in the tuning section that discusses this phenomenon, but about the only thing we can come up with is that it must be due to having the regulator all the way back in the tank instead of at the rails. Not even an upgraded fuel pump fixes this aparently...

brad8266

iTrader: (23)

The only thing that helps is getting a boost a pump.