Best high-flow injectors for the Fiero V6? (Page 1/3)
pmbrunelle MAY 26, 12:11 PM
Any suggestions for higher-flow fuel injectors that will drop into the stock Fiero V6?
Same physical form factor, same connector, and high impedance like stock.

I am hitting 90% duty cycle with my 30 lb/hr Accel injectors. I guess I'm looking for injectors in the 44 lb/hr to 50 lb/hr range in order to up the power. Published dead-time data would be a plus, but not required.

I'm not sure Accel is good. Olejoedad doesn't seem to think so either. So I'm open to changing brands, or maybe OEM injectors from another car.

Before pulling the trigger, I'll be sure to check that my fuel pump is indeed maintaining enough fuel pressure.
fierosound MAY 26, 01:58 PM
The stock Fiero V6 engine had 15# injectors. (3.4L has 17#)
I'm running 21# GM/Rochester injectors with my 3.4L V6 with Supercharger and have no problems.

So what's different about your engine? Why did you need 30# injectors to start with?
EDIT: I see now. http://www.fiero.nl/forum/F...2/HTML/142133-2.html

Maybe it's the Accel injectors?
https://www.thirdgen.org/fo...jector-problems.html

The Fiero uses Bosch EV1 jectronic style high impedance injectors.
I've only seem them in 42# and 52# ratings at retailers.
Chart http://users.erols.com/srweiss/tableifc.htm

Maybe this GM/Delphi will suit your application?
https://www.injector.com/ca...-PAC-KIT-48p2169.htm


------------------
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3.4L Supercharged 87 GT and Super Duty 4 Indy #163

[This message has been edited by fierosound (edited 05-26-2020).]

Dennis LaGrua MAY 27, 09:10 AM

quote
Originally posted by pmbrunelle:

Any suggestions for higher-flow fuel injectors that will drop into the stock Fiero V6?
Same physical form factor, same connector, and high impedance like stock.

I am hitting 90% duty cycle with my 30 lb/hr Accel injectors. I guess I'm looking for injectors in the 44 lb/hr to 50 lb/hr range in order to up the power. Published dead-time data would be a plus, but not required.

I'm not sure Accel is good. Olejoedad doesn't seem to think so either. So I'm open to changing brands, or maybe OEM injectors from another car.

Before pulling the trigger, I'll be sure to check that my fuel pump is indeed maintaining enough fuel pressure.



You are using 30lb injectors running 90% duty cycle on a stock Fiero V6? Running twice the original fueling flow rate? That doesn't sound quite right. You should be fine with the stock #15 injector size and with mods #17 should do. As for choosing new injectors, beware, the market is becoming flooded with inferior Chinese units that do not perform well.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Will MAY 27, 09:26 AM

quote
Originally posted by Dennis LaGrua:

You are using 30lb injectors running 90% duty cycle on a stock Fiero V6? Running twice the original fueling flow rate? That doesn't sound quite right. You should be fine with the stock #15 injector size and with mods #17 should do. As for choosing new injectors, beware, the market is becoming flooded with inferior Chinese units that do not perform well.




Try checking the post right above yours...


quote
Originally posted by fierosound:

So what's different about your engine? Why did you need 30# injectors to start with?
EDIT: I see now. http://www.fiero.nl/forum/F...2/HTML/142133-2.html
Dennis LaGrua MAY 27, 01:44 PM
On my highly modified turbo 3.4L, I run #24 injectors and with 15 psi of boost . With some changes to the CM program I can the engine with fuel to the point where the exhaust smoke turns black. It was was a matter of adjusting the BPC number in the constants table to suit the flow and making some small changes, adjusting the VE table and PE a bit. I guess if the OP is running super high boost then larger injectors would be necessary but whos going to put that much boost in the 60* V6. The rods and crank just won't hold up.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

La fiera MAY 27, 03:06 PM

quote
Originally posted by Dennis LaGrua:

On my highly modified turbo 3.4L, I run #24 injectors and with 15 psi of boost . With some changes to the CM program I can the engine with fuel to the point where the exhaust smoke turns black. It was was a matter of adjusting the BPC number in the constants table to suit the flow and making some small changes, adjusting the VE table and PE a bit. I guess if the OP is running super high boost then larger injectors would be necessary but whos going to put that much boost in the 60* V6. The rods and crank just won't hold up.




Injector requirement is not based on displacement, it is based on fuel required for a horsepower target regardless if its turbo charged
or naturally aspirated.
I ran out of injectors with the #36 when my car did 277WHP on gasoline.
Honest Don MAY 28, 11:34 AM

quote
Originally posted by pmbrunelle:

Any suggestions for higher-flow fuel injectors that will drop into the stock Fiero V6?
Same physical form factor, same connector, and high impedance like stock.

I am hitting 90% duty cycle with my 30 lb/hr Accel injectors. I guess I'm looking for injectors in the 44 lb/hr to 50 lb/hr range in order to up the power. Published dead-time data would be a plus, but not required.

I'm not sure Accel is good. Olejoedad doesn't seem to think so either. So I'm open to changing brands, or maybe OEM injectors from another car.

Before pulling the trigger, I'll be sure to check that my fuel pump is indeed maintaining enough fuel pressure.




60mm with an EV1 connector will drop right in. It's a common size with at least GM and Ford. Personally I'm using Siemens Deka.

Easiest way I've found to check fuel pressure is to tape the test gauge to the back window and have the passenger watch it under acceleration. That way you can confirm the pump is keeping up under boost.
La fiera MAY 28, 02:48 PM

quote
Originally posted by Honest Don:


Easiest way I've found to check fuel pressure is to tape the test gauge to the back window and have the passenger watch it under acceleration. That way you can confirm the pump is keeping up under boost.



The needle in the gauge should be steady, if it bounces up and down is because the injector when pulsed, empty the rail faster than the fuel pump can refill it.
La fiera MAY 28, 02:56 PM


I use the EV6 with the EV1 connector and has better atomization than the EV1
Honest Don MAY 28, 03:55 PM

quote
Originally posted by La fiera:


The needle in the gauge should be steady, if it bounces up and down is because the injector when pulsed, empty the rail faster than the fuel pump can refill it.



Yes, but pressure can be steady at idle or engine off/pump test, but drop like a rock when fuel demand increases(WOT) if/when the pump can't keep up.

And if he’s using the stock regulator, fuel pressure should be referenced to manifold. Mine tests out at around 45psi fuel w/engine off (96-ish kpa) and rises to 55psi fuel under boost (170-ish kpa)

[This message has been edited by Honest Don (edited 05-28-2020).]