High Imp Injector help

[Shane@DBPerformance]

You want a lower deadtime. Those EV14 would be almost 3 times as fast to respond as those EV6 going by those deadtimes. Stock DSM 450 injectors are set at around .650ms at 14v in the factory tune and stock Evo 560cc injectors are set at around .432ms in the factory tune.

Those EV6 injectors would really be a 1900cc, while the ID2000s are really 2200cc.

Those cheaper ones might work fine for you though, since the factory DSM ECU is excellent at handling even the 1600s compared to most ECUs. Hopefully they are linear though, that is one of the main problems with the 1600s, not just that they are a bit slow. You can make an injector respond faster by using a box like the FIC Easytune which raises voltage to the injectors from battery/alternator voltage to a constant 17v. Running injs at 17v versus ~13.5v will cut down their response time by 30%-70%.

[Halon]

Can a DSM ECU even control the EV14 injectors to their max speed capability? I guess I'm getting confused with all these values I'm seeing now.

I heard someone like me who doesn't have V3 might be looking at no better than 1.3ms deadtime adjustments. So, if I have an injector capable of .4ms, and an injector capable of 1.1ms, is that not completely besides the point because they are both lower than what the ECU can even do so they'd be running at the same speed right? Or am I just totally understanding all of this wrong?

Can you throw out examples of what the old 1600's respond at for comparisons sake? That's what I have now, and I'm looking to improve that. So it'd be cool to see what these crappy 1600's are and compare from there.

[Halon]

Sorry I've got another dumb question in regards to this chart:

http://i609.photobucket.com/albums/tt173/t1race/PressureSensitivity.jpg


Just as an example, say I'm running 45psi base fuel pressure on my talon. That basically puts me at the 3bar line. Now, lets say I am running 30psi of boost. That will raise my fuel pressure from 45 to 75psi. But, that boost is also going to be felt at the outside of the injector tips correct? So my fuel pressure is 30psi higher, but my injector tips are also seeing an additional 30psi on the outside, so the pressure differential is pretty much the same right? So I guess my question is, when I hit full boost, am I now looking at the 5 bar spot on the graph, or am I still at the same spot I was to start with because the increase in pressure was seen on both sides of the injector tip meaning the pressure differential is still the same?

Sorry, just trying to research this to death and do my best to understand it all, ha.

[v8klla]

Pressure in the graph above refers to fuel pressure not boost pressure I believe.

[Kevin 1G Drummer]

I would assume that since the pressure increases equally on both sides of the injector, that you would still be looking at the 3 bar line.

[Halon]

I would assume that since the pressure increases equally on both sides of the injector, that you would still be looking at the 3 bar line.

I think you are right. So is it safe to say that unless you plan on running a base fuel pressure higher than 5bar (which at this point I have no intentions of doing due to limitations of my pump setup), these should still flow decently?

[v8klla]

Response from FIC:

I’ve been checking those injectors out for a while now, wondering what they are since there are really no Denso injectors that size available anywhere. We just got some in here to check and came to the same conclusion as the ID guys, which is that these are re-manufactured Denso injectors with a VERY crude modification (hit the internal pintle hard with a hammer) to reach the elevated flow. This process makes the injectors slower and more unpredictable at short pulse widths (idle) and is therefore not really the desired way to go, although some guys with huge flow requirements who care little about the idle may be OK with this. Since most guys using 2000cc have pretty expensive motors, this would be quite a chance to take.

[Halon]

What injectors are those? The Wizard ones? Everyone is comparing to the Wizard ones, but I'm looking at the ones from Five-O. Guy on the Link forums has a set of the ones from Five-O and he said he sees no evidence of hammering on the pintle.

I dunno...

[v8klla]

Second response:

We had Five-O, but they are all the same, EFI Wizard buys from Five-O who buys from the guys who modify them, or EFI Wizard may buy direct, but I don’t think so. Neither of them actually modify this injector. It’s a small and incestuous world ….

[Halon]

Interesting, thanks for the feedback. I'm tempted to try them, but at the same time scared if I end up just wasting $480...