Having these same parts in front of me, I spoke with Jens, at FIC, this morning. He is sending me some different lower parts to test fit, and I'll report back as soon as they arrive.

There might also be the option of some machined spacers that would position the injectors just enough higher to permit clearance without any modification to the manifold. Jens says the spray pattern of the FICs would not be significantly affected by some minor movement in that way...

FIC also mentioned that they have the BOSCH 1000cc injectors shown above available (at great prices ), but that their testing at stock fuel pressures show that these injectors flow more like 900cc, instead of the 1000 that they're "rated" at...

 

Thanks for your input Magnus. Out of curiousity what injectors do you recommend for the cast manifold for an easy fit and installation when more flow is needed.

 

We recommend the New Bosch units that Forced Performance has pictured, Very impressive pieces!

 

FYI regarding the fact that FIC reported these flow more like 900cc injectors at base fuel pressure... I found this sheet of datasets:

http://www.bosch-motorsport.com/cont.../html/2659.htm

and using a specific gravity of gasoline (it varies) the reference I found states it as 0.739 grams per cc.

So 658g/min / .739 cc/min = 890.3cc

It does look like the sweet extended injection point EV12 could be a sweet upgrade for the evo x if they wind up with some bigger sizes (364cc/min just isn't enough!) or someone modifies them (I've seen people modifying the stock injectors already).

 

In talking to Jens yesterday, they are rated at 900 on calibration fluid and will flow 1000cc on C16 SG fuels.

 

The Bosch injectors are very fast reacting, and have a very nice flow pattern. The issue that has to be addressed with the Bosch injectors is that they flow less than 1000cc at "normal" Evo base pressure. That is a limitation for builds over 500 or so HP on gasoline, and even less if you decide to run E85, which needs about 30% more fuel for the same HP. If your build is under that limit, no worries, but most people looking to install an aftermarket intake manifold are not putting them on otherwise stock motors.

The Bosch injectors can be used with much higher base fuel pressure (as high as 90 PSI), which yields increased flow volume, but you would have to design a fuel system (pumps, in particular) that would provide the flow volume you need at that pressure, and there are not many pumps in that category. The Bosch 044 fuel pumps (in tandem) will flow good volume up to 130 PSI, but they won't fit in any remotely standard in-tank configuration, because they have a substantially greater diameter than the stock pumps.

All in all, I'm told that it takes very little metal removal from the manifold to fit the FIC injectors, and that may be the best solution all around, as it can be used with "normal" intank fuel pump options. When the injectors are installed, the mod cannot be seen if done carefully. Magnus will do the modification for you if you let them know when you order, so it's really no big deal.

 

I'll make this short because I don't mean for this thread to go off topic, but those skinny injectors aren't particularly fast. I bench tested the latency of two different size of these injectors designed to be used in high flow WRX applications, and both sizes had higher latency values across the voltage range than my FIC 1050s, and FIC 1050s aren't known for being a fast injector. I can send you plots offline if you want to discuss further.

 

The Bosch units in question aren't the factory 915's but modified ones.

 

Well the final fix for me ended up switching to PTE injector which are basically the same thing as the FIC injectors except the PTE's use pintle caps and the stock intake manifold injector rings. The PTE's sat up just a little bit higher than the FIC's. I did end up having to ground off just a touch to get the intake manifold to clear the injcetors. Thanks for everyones help.

 

Glad those PTE's worked for you, I ended up buying some 1050cc, now i will see how they perform on my current setup.