What's the problem with the holley injectors? I don't understand. Why are there injectors such crap. I know they aren't as well toleranced as delco but still...
What's the major problem?

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, Jon (350 TBI! getting 23mpg highway)
91 Red RS w/grey int, sq stereo (Alpine v12, kicker solo, MB quart premium etc)AIM: JPrevost

• Holley 670 TB unit w/ 1/2" spacer/adapter
• Edelbrock RPM vortec intake
• 350ho 330hp vortec crate motor
• 8" harm. balancer
• Stewart stage 2 water pump w/160 thermo
• SLP tri-y headers to full 3"
• Rebuilt trans w/ SLP shift kit
• Centerline 16x8's all around
• 36/24 mm sway bars
• Full poly bushings, even motor mounts
• SLP LCA and panhard
• Alston SFCs
• Edelbrock 3 point STB
• Global west steering brace aka wonderbar
• Eibach pro kit springs
• Bilstien high perf. struts and shocks
• All this and I still have AC

My websiteAny questions?

 

You tell me brother! I asked you this in another post but you never responded. I figger it's one of those deals where one person heard another say... If your car is running great then that leaves me hope for mine!

Steve

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Steve's Trans Am Temple

 

JP, I read on another thread a while ago that a number of people had problems with the injectors. I also read in the same thread that other people had no problems...............bob

 

Really the only prblem is that the injectors included can't handle higher pressures. I think the max is around 17 psi where as GM injectors can go up really high(I've heard as much as 50psi). Then what happens on the Holleys is since the pressure is low, the spray pattern is much less uniform than if they were at a higher pressure. This hurts fuel atomization and the direction of the spray is on top of the throttle blades, not to the walls of the throttle body.

I said screw it and went with the Holley. I haven't had any problems and I haven't lost a race yet .

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88 firebird formula
350 Vortec TBI
214int/224exh, .471int/.491exh
Edelbrock headers
SIX-speed
open 3.73's
2 1/4 stock catback
I love pissing those LS1's off
My Formula

All your base are belong to us.

[This message has been edited by Birmass (edited April 11, 2001).]

 

That's what I like to hear!

Steve

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Steve's Trans Am Temple

 

i had the holley on my car for teh first year i had the new motor (last year). i liked it but it did run rich, due to me using a stock chip.

the only reason that i am experimenting with a 454 tb is because i have never been able to set the TPS correctly on teh holley unit, which i think makes teh car stumble when i floor it form an idle. i can only accelerate the engine at a certain point, then it just hesitates and bogs down. which SUCKS A$$ when i am running with someone.

i guess its a trade off...i see it as worth the 150 bucks it i can get teh TPS working and get rid of the hesitation.

but, now the problem is that i need a chip burned ASAP, but i hve to be able to tell fastchips what i am running throttle body wise, so i have to decide what i am going to do.

i think i am just going to tell them that i have 65# injectors, so that either the holley or the 454 one will work.

but other that the driveability problems, i have no problems with the holley. but i'll be damned if i lose another race off the line to a new SS or WS6 because my damn car hesitates. its kind of a last stich effort. and we all know that holley is the BIGGEST bunch of a$$holes around when it comes to customer service. at least as far as we are concerned.

-brian

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1991 Camaro RS - ultra blue metallic, t-tops
GMPP 350 HO crate engine - 454 TBI, MSD ignition, SLP exhaust, everything is new
700R4 - 2,400 stall converter, vette servo, shift kit
10 bolt - SLP zexel torsen differential, GM 3.42s
z28boy.fbody.com
z28boy@twcny.rr.com
AIM - "Z28 Boy"

1998 Pontiac Grand Prix GT - 2 door, black

 

SOme of the units work forever without glitch but others will act up in a month or so, others in about a year. injectors stick open/closed. The injectors clog VERY easily and the connectors are an assembly problem (pins centered in the "wires" and wires not pincing tight enough) and corrosion nighmare (on the pins) over time.

Very high return/warranty rate... but they sell so many, they do not care.

 

I woulda answered had i seen this question before but ive posted why they are bad numerous times

First off, they are limited in pressure to 18 psi
Secondly, the spray pattern is attrocious. Rather than a smooth cone, you have like 8 or so individual streams coming out of the injector. To further exacerbate the problem, the cone does not open anywhere near wide enough. Most of the fuel shoots straight down smack into the throttle blade in the center.
Where the fuel and how the fuel is introduced is problably the most important reason why they suck.
TBI relies on the edges of the throttle blades atomizing the fuel at idle or low throttle angles. What happens when it hits the throttle blade is that the fuel comes off the blades as droplets and just drips off into the bottom of the manifold causing a rich condition in the rear cyls. This is usually further worsened by an over active IAC or minimum idle set to low
with the GM injectors, first off you have a very smooth and even cone, and, the injector pod can be positioned such that that cone hits the tb bore walls just above the edges of the throttle blades. This creates more uniform distribution as the fuel is better atomized than if most of it puddled up at the back. Most GM TBI injectors are also good to 30 psi atleast and a few have been known to work well as high as 70 psi
etc etc

I run the holley throttle body.. and originally ran the holley injectors and saw all this first hand. I then bolted on the gm pod and tapped the TB for the aircleaner stud. much better now

[This message has been edited by Pablo (edited April 11, 2001).]

 

I kinda miss the Holley injectors spraying into the phillips heads screws that hold on the throttle plates... Nice upwards spray into the aircleaner paper. Pretty cool...

Everything Pablo said is correct. They need some serious redesign over there. Ain't gonna happen.

 

Okay, well that answeres my question.
Now does anybody have 350 injectors or 65#?

------------------
, Jon (350 TBI! getting 23mpg highway)
91 Red RS w/grey int, sq stereo (Alpine v12, kicker solo, MB quart premium etc)AIM: JPrevost

• Holley 670 TB unit w/ 1/2" spacer/adapter
• Edelbrock RPM vortec intake
• 350ho 330hp vortec crate motor
• 8" harm. balancer
• Stewart stage 2 water pump w/160 thermo
• SLP tri-y headers to full 3"
• Rebuilt trans w/ SLP shift kit
• Centerline 16x8's all around
• 36/24 mm sway bars
• Full poly bushings, even motor mounts
• SLP LCA and panhard
• Alston SFCs
• Edelbrock 3 point STB
• Global west steering brace aka wonderbar
• Eibach pro kit springs
• Bilstien high perf. struts and shocks
• All this and I still have AC

My websiteAny questions?

 

I am going to get the 350 HO TBI put into my 305 TBI right now. I'm going to be running stock chip and stock gears until I get some cash to upgrade. What kind of problems is this going to give me?(Z28Boy, I read you had some trouble...)

Thanks '
Dave

 

the 350 tbi is the same as the 305 tbi except it has larger injectors. What kind of problems will you have? Well, your car will be way slower and consume copious amounts of gas


"I kinda miss the Holley injectors spraying into the phillips heads screws that hold on the throttle plates... Nice upwards spray into the aircleaner paper. Pretty cool..."

LoL hahah.. I wonder if 18 psi is just the limit because anything more would be a firehazard what with all the fuel bouncing back out of the throttle body