Question about injectors.

[EspanolaGuitarista]

What are the voltage ranges for a 3100 in a 1995 Beretta. Can a different injector be used out of say a 3400? If I'm going to port my heads and intake then more fuel at WOT would be very helpful.

[ProjectMM]

there way to big, your talking about 22.5lbs in a 3400 compared to 18 -18.5 lbs. if you really want a little bigger injecters, i've got a set of venom injectors for sale if your interested. just let me know

[LA1 Z24]

there way to big, your talking about 22.5lbs in a 3400 compared to 18 -18.5 lbs. if you really want a little bigger injecters, i've got a set of venom injectors for sale if your interested. just let me know

I'm interested...How much? New? lbs p/hr?

[ProjectMM]

Wright me at ProjectMM@hotmail.com! make me an offer on them! thay list for over 400! I'd like to get at least 1/2 my money back.
Check out venom-performance.com for there application
Part # HP645-407 dosent give any Pressures, but i was told that they were 18.5 lbs that flow 10%better then stock! let me know!

[EspanolaGuitarista]

Thanks for the info.

I wouldn't be interested in your injectors. That seems overpriced for 10% more flow. Could I use the 3400 injectors and decrease the fuel pressure with a adjustable unit? I don't think 22.5 lbs is way over the top. It should only spray that much at WOT.

[pocket-rocket]

I thought those ratings (22.5 lbs/hour) would be at 100% duty cycle? Our injectors are never run that high, I think 80% is the most they go. I could be wrong though.

[Corpse]

You could lower the pressure as was mentioned but, yuo will have adverse side effects. The injectors are designed to work under a certain nominal range of fuel pressure. Whereas, you don't want to go below the high 30's for PSI. On the other hand, you do not want to go too high in fuel pressure unless, the injector was designed to use the higher pressure range.

The pressure of the fuel is part of what actuates the metering device of the injector, therefore, the injector will have trouble functioning as it normally would.

Your Gen III SFI V6 may have Multec style unjectors. Multec injectors use a different type of metering device than traditional Pintle style injectors, so, at least you would be getting a change in injector style.

You would also be getting a product that "should" be made with more quality behind the electronics and internals and, it may be able to have a higher duty cycle, more consistent/refined flow, higher heat resistance and things like closely matched coil resistances. Etc...

Also, yes, the injector rating should not be counting the duty cycle. And also, it should also NOT include the pressure differential between the rail and manifold (Yes, the diffeence in pressures between the fuel in the rail and the air in the manifold does factor in).

Maybe you could see the duty cycle like a valve spring, if you push a soft spring too hard you will see valve float, ie: Spring is beyond it's possible duty cycle.

Well, guess what, this is another one of those situations. Also, the possible duty cycle shoudl go down as fuel pressures increase. And also, when you are increasing the pressure of an injector, when it sees maximum pressure it should fail to work (lockup) somewhat, until pressure is lowered. Play it safe, if an injector is rated for nominal pressore of 40 PSI a good rule of thumb would be to keep it under 150% of the origional pressure. IE: injector is rated at 40 PSI, Keep it under 60 PSI or, you will really be taxing the injector in most cases.

Get some nice Lucas-Disc type injectors or something. you would notice more possibilities for improvement using the 3400 series injector with the high flow rate than you would from a slighlty higher than stock rated injector. But, you will have a wonderful computer descrepancy.

i'm going to bed.

Sorry to babble.

-Dave

[Chris88CL]

Arent the 3400 Multec II injectors rated at like 47.6lb/hr?
Or are these multec II's different? http://www.delphi.com/pdf/e/multec2_inj.pdf

[Manitcor]

3400 injectors are rated at 22.5lbs, 47.6lb injectors are huge next to the 3400 injectors.

The connectors are different between the years however its a stright wire for wire match so you can modify the harness to make it work.

[pocket-rocket]

Get some nice Lucas-Disc type injectors or something.

I would like to get some, but from what I have been told, the DOHC injectors have a special spray pattern that helps with the fuel mixing with the air. I imagine there are some Lucas-Disc type with the same kind pattern, but I haven't researched them enough to find out for sure. Anyone know what kind of price difference there is between stock injectors and Lucas-Disc type?

[EspanolaGuitarista]

The duty cycle on a larger injector would be less I would think, since there is more fuel. I'm thinking the computer the computer would lean out the larger injector and economy would go back to normal after awhile. On the other hand if there is a minimum duty cycle then it may run rich at idle no matter what. 22.5 lb/hr doesn't seem like enough to have a real problem. WOT would see the improvement. More compression+more flow+more gas seems like a great combination to me. The voltage ranges are the most important. They have to be comparable.

[pocket-rocket]

I'm thinking the computer the computer would lean out the larger injector and economy would go back to normal after awhile.

The computer will only adjust so much. If your still running rich after that, you have to live with it untill you tell the computer what size of injectors you have, or go the cheating and not to accurate way and get an AFPR and lower the fuel rail pressure possibly.