racetronix delphi/lucas fuel injectors
05-25-2005, 03:30 PM
Join Date: Sep 2004
Location: NC - Charlotte area
| | racetronix delphi/lucas fuel injectors
I recently bought these and they have a single center hole where the injector sprays fuel, the stock injectors on my 01 trans am ws6 has injectors where there are several holes like 4 or 5 on the injector i think? and that allows for the fuel to atomize quicker and allows for a quicker and faster burn, in other words more efficient. Why did racetronix build them like this and what do some of you other people have out there for new injectors?? the injectors that i got were 32lb/hr injectors
seems to me that the single whole in the center wouldn't be as efficient as the 4-5 holes
01 T/A WS6 #4984 PM for info...funny rear mount...father/son build. My Rear Mount build 655RWHP & 688RWTQ NEW: TC76, 69.65# FIC 725s , FPR, External Bosch 044, 12-Bolt 3.42,
Manifolds, Forged Rods+Pistons, Leaky Moser or issues?
05-25-2005, 10:10 PM
Join Date: Feb 2004
Location: In my garage
Last time that I checked, Racetronix wasnt in the business of manufacturing injectors.
Its the spray pattern against the valve that atomizes fuel.
Do they work and did you MPG drop?
__________________ 2000 SS #15 Convertible
2001 K2500 LS Suburban
1998 BMW 318Ti (360K miles stock) CNGForum.com
05-26-2005, 08:21 AM
On The Tree
Join Date: Sep 2004
Location: J-VILLE FL
Good luck with your tune
93Z built 355 11.5.1 compression eagle crank, eagle 6 inch rods,
JE fordge pistons, ported Edelbrock performer Lt1 heads, Pro Comp Magnum 1.6 roller rocker, Pro Comp Magnum lifters, Comp Cams Extream XFI 242/248 584/579 113 Lsa, BBk 58 mm throttle body, Ported LT4 intake, Ractronix 37lb injectors, adjustible fuel pressure Reg, K&N CIA, MSD 6al, Slp shortie headers, Borla 3inch exhaust, built A4 transmission with TCI 3000 stall converter, 373 rear end gears.
05-26-2005, 09:33 AM
Join Date: Mar 2002
Location: East Central Florida
Single hole is a pintle-type and the disc-type are multi-
hole, is my understanding; I believe the Delphi are all
disc-type. Maybe you got the Bosch 42s instead? I'd
check the P/N vs what your invoice says was ordered.
Pintle or disc both will produce an atomized cone.
Final vaporization is gained off the backside of the
hot valve. A broad cone may partially miss the valve
and hose down the walls, and puddle some of it
Disc are supposed to be more resistant to fouling
(at least, according to the prople who sell disc
type injectors). Various injectors will have different
spray cone angles, which play better or worse
against the intake runner and valve position; they
will have different actuation times and low-opening
delivery, which wants the injector offset data to
match. Some will, and some won't, be "close enough"
to stock injector time-characteristics to get by with
no adjustments (and no data) other than main full-
open flow values.
I'm pretty sure you could work your way to a proper
offset table but you're basically on your own, for it.
Though someone with an injector flow bench, and
variable voltage & pulse width drivers could get the
data, very few price-shoppers would pay the tab I
expect. You're talking thousands of dollars in gear
(retail; you could cobble if you had hoarded the
right stuff) and somebody standing around taking
high grade data for about a day if you want to fill
in the whole offset table cell by cell. Show of hands,
who wants the bill? Thought so.
But in the other thread I did outline one notion of
how you could back into a semi-decent offset table,
using in-car data. At least for the "normal" voltage
rows. And presuming an otherwise error-minimal
air fuel calibration, pre-swap.
If you have too rich an idle (- LTFTs) then reducing
the offset table values will lean it out.
However, over-enriched idle can also be an artifact
of the pump/regulator operation (higher pressure than
modeled, at idle). The IFR table assumes a dead flat
pressure, square-law pressure vs delivery which is
all not true, regulator slope and forward run drops
are not modeled in the IFR table (it's a straight line,
sqrt(vac) style). With a rail-mounted regulator this
might be more true but stock, it's only "close enough"
and you're not stock, by the time you're buying big
But I suspect the tuning "issues" people have been
encountering, lie with the differently-constructed,
different-timing injectors and the offset table, more
than with the line pressure deviation. Though, if you
stack a new pump and new injectors, you have
double the fun. Or maybe, fun squared.
__________________ 2002 SS convertible SLP Blackwing lid, 85mm MAF, 85mm Professional Products intake & TB, SLP CME, JBAs/Mufflex tubes . SLP Y, McCord cutout, Fuddle 3500/2.0, GM truck pan, '98 flexplate, 3.42s, T-2R, MAC cover, welded tubes, Hotchkiss PHR, springs; BMR bolt-in LCA brackets, K-member; UMI TA, boxed stock 1LE LCAs, SLP Bilstein / Gabriel air shocks (F/R); Strano 35/22 sway bars, 224/224 116 cam, LT1 rad, HPTuners 12.6@112MPH
05-26-2005, 09:33 AM
| Tags |
|440, 440cc, delphi, fuel, hole, injector, injectors, ls1tech, lt1, lucas, offset, race, racetronix, single, tronix || |