 
     |
| Best high-flow injectors for the Fiero V6? (Page 2/3) |
|
Honest Don
|
MAY 28, 04:04 PM
|
|
| quote | Originally posted by La fiera:
I use the EV6 with the EV1 connector and has better atomization than the EV1 |
|
Mine are modern as well. In terms of fit, the connector type is the important part.[This message has been edited by Honest Don (edited 05-28-2020).]
|
|
|
|
pmbrunelle
|
MAY 28, 06:58 PM
|
|
I decided to make a thread separate from my project diary. This is generic information, applicable to anyone modifying a 2.8. Archived information is easy to find when it's in its own thread. It's hard to find information that is buried in people's project threads.
That's a lot of chart to swallow 
I thought I was going to have to familiarise myself with all this stuff, but after seeing this thread, someone came out of the woodwork and offered me a set of 42 lb/hr Bosch injectors. If they work out for me, I'll repost with a part number and comments, for the future reader of the Archives.
| quote | Originally posted by Dennis LaGrua:
On my highly modified turbo 3.4L, I run #24 injectors and with 15 psi of boost .
|
|
There's something a bit off, because my absolute manifold pressure is only 155 kPa. So it's like I need more injector with less boost, and less displacement (3.2 L). Strange. Do yours go static at maximum power?
Same for fierosound; it seems strange to me that 21 lb/hr injectors are able to feed a supercharged 3.4 L.
I guess every setup is different, and you gotta do what you gotta do to make each one work.
Yesterday I hit only 81% duty with an AFR of 11.4 on a 1st gear pull. There has been a heat wave (like 32 °C) here this week, so I guess the air is less dense than previous tests I did with an ambient temperature of 10 °C or so. I guess you need to size injectors with enough headroom for the coldest weather the car is likely to see.
| quote | Originally posted by Honest Don:
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. |
|
Siemens is a good brand.
I think I'll be the riding mechanic watching the gauge while someone else drives. I'll have less explaining to do to my helper that way!
| 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.
|
|
On a stock Fiero, all six injectors (15 lb/hr each) are opened together. So that's 90 lb/hr emptying the fuel rail!
I don't think this will be a problem on my Fiero, since I have sequential injection. With only one injector opening at a time, it should cause less bounce than with a stock Fiero.
| quote | Originally posted by Honest Don:
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)
|
|
I have completely stock fuel plumbing, the stock rail + regulator, and the stock manifold reference line. No need to touch something that ain't broken! At idle, the stock regulator has enough flow capacity to return the excess flow of my EP-381 to the fuel tank.
I've configured my computer to expect a constant pressure across the injector. Also, this way you don't have to worry about pressure variations affecting the injector dead time, since you've taken out that variable.
|
|
|
|
Will
|
MAY 28, 07:31 PM
|
|
| quote | Originally posted by pmbrunelle:
I don't think this will be a problem on my Fiero, since I have sequential injection. With only one injector opening at a time, it should cause less bounce than with a stock Fiero. |
|
Between 67% & 84% DC, you will have 5 injectors open at a time.
|
|
|
|
Will
|
MAY 28, 07:40 PM
|
|
| quote | Originally posted by La fiera:
I ran out of injectors with the #36 when my car did 277WHP on gasoline. |
|
On the other end of the scale, my Northstar made 312 WHP with 19# injectors (Ford Motorsport orange tops).
|
|
|
|
Will
|
MAY 28, 07:41 PM
|
|
| quote | Originally posted by Dennis LaGrua:
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.
|
|
Shaun (yes, *THAT* Shaun) made over 500 wheel on a stock bottom end LX9.
|
|
|
|
pmbrunelle
|
MAY 28, 08:29 PM
|
|
| quote | Originally posted by Will:
Between 67% & 84% DC, you will have 5 injectors open at a time. |
|
I was writing in reference to the transient pressure drop due to an injector opening event suddenly increasing the fuel consumption.
|
|
|
|
La fiera
|
MAY 28, 09:53 PM
|
|
| quote | Originally posted by Will:
On the other end of the scale, my Northstar made 312 WHP with 19# injectors (Ford Motorsport orange tops). |
|
Yes, because you have 8 injectors feeding 8 cylinders to make 312WHP.
For a 6 cylinder to make 312WHP would take six 32# injectors.
The less cylinders the bigger injector you needto match a power level of an engine with more cylinders.
|
|
|
|
Blacktree
|
MAY 29, 01:31 AM
|
|
I second the EV6 recommendation. Those are the rotating disc style injectors. They have a better spray pattern than the old pintle style injectors. You can find sets of rebuilt EV6 injectors on eBay pretty cheap. Just make sure the seller is reputable.
Side note: Not sure how some of these guys are getting away with such small injectors. Maybe they aren't revving their engines very high? My 3.4 V6 (naturally aspirated, 93 octane) needed 24 lb/hr injectors to keep it happy at high RPM. The 19 lb/hr injectors didn't flow enough.
|
|
|
|
Will
|
MAY 29, 10:34 AM
|
|
| quote | Originally posted by La fiera:
Yes, because you have 8 injectors feeding 8 cylinders to make 312WHP.
For a 6 cylinder to make 312WHP would take six 32# injectors.
The less cylinders the bigger injector you needto match a power level of an engine with more cylinders.
|
|
6*32 = 192 (or is it 36? 6*36 = 216)
8*19 = 152
Anyway... Northstars seem to end up with freakishly low BSFC at peak power.
|
|
|
|
La fiera
|
MAY 29, 01:57 PM
|
|
When I installed the upgraded manifold, the AFR gauge was pegged lean, even revving it in the driveway.
I used the Autotune feature to have an idea of how much fuel the engine was asking for and it was a lot.
I took it up and down the street at part and some WOT and when I saw the increase in VE I couldn't believe it!
Based on the percentage Autotune increased the VE I re did the entire VE table +30% all around to start.
I'll check the Duty Cycle this time to see if I need more injector.
Right now I have enough injector for 380WHP
|
|
|
|