^
Dan
(PS Again, I am basing the latency values off of the 43.5psi numbers for the injectors, I am doing that because I am told the Walbro slightly raises fuel pressure above the standard value)

 

It doesn't...........my base pressure at idle was the same on the stock pump as it was on the walbro according to the gauge I installed at my fuel rail.

 

I would just keep driving the car and check the trims again tonight.....

Was this on the original scaling & latency you already posted? (oops seems you answered the question above, sorry)

 

After you get around to hammering on it you will notice less knock activity as well.

Compared to the Delphi 950's I saw 15% less max DC% at the same power level and fuel pressure, and other benefits.

I would not try to run high base pressure with a single Walbro type pump, it won't cut it, need to add a Bosch 044 in-line and a decent HP regulator such as the Weldon 120.

There are 2000+cc/min versions available now (or very soon).

 

I'm surprised by the lower duty cycle. That is making me think more and more that I might be able to switchover without issue, but obviously still keeps a red out of my future.

I'm still slightly concerned with a switch as a normal walboro is good for no line pressure drop on 1000cc injectors, but not much above. Obviously with increased pressure you run into lower flow. A double pumper would increase costs here pretty significantly (on top of the other goodies).

When speaking about 2000+cc/min are you talking about injectors?!

 

I hadn't mentioned it, but I've been running these injectors for four months now. You probably could have guessed from my interest in all the Bosch injector posts. I bought them based on the claims made by T1 of better mileage, better idle, and generally awesome performance. After four months, about the best I can say compared to my FIC 1050s is that the Bosch injectors idle better, keep slightly tighter fuel trims, and have slightly better cruise tip-in response. I figure the improvement in idle and trims is just because the Bosches flow 20% less than my FIC 1050s (at equivalent fuel pressure). I have yet to see an increase in mileage or any ability to improve my tune (e.g., be able to run more timing, make better power with a leaner or richer mixture, or whatnot). The real kicker with these injectors is that they make my car hard to start on both gasoline and E85. A least with the FIC 1050s, the car started like a champ on E85. I've been working with trav (he's having the same warm start issue, so is R/T Ernie) and dan_l to try to figure out what's happening, but so far no luck. Overall, I'd say the improved cruise tip-in response is the only real benefit I've experienced. Is that worth the extra money and the possibility of having warm start issues? Probably not, but I haven't given up on fixing the warm start issue yet. I'm hoping I can do a little more digging in the ROM code to find other algorithms and tables that control startup fueling. Anyhow, I hadn't planned on tossing my opinion out there in this thread and pushing it off-topic, but since someone else started it, I wanted to toss my experience out there too.

 

Thanks a ton for the response. That makes me much less ga-ga over picking these up and much more into getting better latency set for my current injectors. It will also allow me to focus more on some other necessary parts right now.

I'm definitely still interested in these injectors, if nothing else they have a ton of good, fresh support behind them... but if they won't fill my future needs and won't offer a current, significant improvement for me then I'm OK to pass for now.

 

I suppose you could do worse than the Bosch injectors. Once the car is started, the Bosch injectors are as good as anything else of equivalent size and are perhaps even a little better at a few minor tasks (idle, light throttle response) than equivalent size injectors. dan_l has said that he got pretty good mileage with them. The trouble is that its a crap shoot as to whether a car will warm start well with them.

 

I have started the tuning process and am having lots of luck so far. I had to do plenty of warm starts between flashes and not even a hiccup. From what I can remember the car starts faster than before and runs just as well, if not better, than stock injectors. BTW, I love only use 60% duty cycle vs 95% before.

Dan

 

More interesting stuff.

Think those are big enough?

 

Those were my impressions. They run better than stock.

I must have had a bad set of FIC's. I had a random misfire problem when I ran my FIC's that was never solved properly. I'm not knocking FIC, its a good bang for the buck injector and I've ran them for years. It just didn't have what I wanted in an injector on my evo.

We ended up putting the exact same FIC injectors on my friends DSM and of course it runs really well. His car has cams even. I think the FIC style injectors are just picky with respect to what kind of injector drivers run them, the 1g may have a stronger driver. I think a piggyback injector driver is necessary to run the larger low impedance injectors on a stock ecu properly.

To summarize I think they are both good injectors. Dealing with either company they will take care of you. FIC warrantied a bad injector for me and warrantied a whole set of 1050's for my friend no questions asked. They also cleaned a set of 1000's for me that I had been using in my DSM and cut me a deal. Also Injector Dynamics has been really good about working with us trying to figure out the warm starting issue on some of the cars. At this piont though, I don't think its the injector because I can swap in a set of injectors with a warm starting issue into my personal evo and it warm starts fine. I don't know what the issue is however.

The nice thing about the ID1000's is that they are low impedance like the OEM evo ecu is anyways. For that reason they are good electrical match. When you run the injector resistor like in the stock driver configuration a portion of the voltage is dropped across this resistor instead of the injector. Thus the injector doesen't get the full battery voltage to open that coil. Not a big deal until you start getting below 3.5 or 3 ms of IPW.

 

Are you running with the Resistor Box in place?

Are others doing the same thing?

I personally bypassed the box.

Dan

 

The resistor box has to be bypassed.

 

Of course, I don't want to take anything away from them. Specifically for me the RC1200 ran super with the stock intake (and then stock pipe with an AMSOIL filter) but LTFT are all over the place with my 3" hard pipe. I know that is common, and better injectors are kind of a bandaid when I know the "real" problem, but I'm always looking for a magic bullet

Those 2000cc injectors look great, but I suppose they probably aren't available other than special order/phone call right now.

Now I'm just being picky, but I wish there was an in-between. The 1000 are just undersized for me, but 2000 seems reallllly big.

 

Fostytou, the Bosch are made for high pressures.

If the 1000s are to small, crank the base fuel pressure.

Toss in an 044 inline with the 255 along with a high pressure requlator and you'll have a fuel system that not only flows well enough to keep up with the 1500cc these can flow, but it will atomize better then stock injectors.

Honestly, I think it's a waste to run this injectors on a lower pressure system.