Here's the test results when my injectors went in for refurb for your FYI.... I can see where you're going and trying to work with the boundaries of the stock ECU..... it might be hard to find the injectors you seek, but there may be something that uses something like that... Image Unavailable, Please Login
well stock ECU yes but with updated chip. Spider map and add 10% - 15% more fuel above 4k. There are a few 330-350 hp 348's on stock injectors out here. With dyno sheets. Lots of porting and general sucky work to get there. Yes the injectors are hard to find especially since stated flows are actual not actual flows. Need to isolate a few, buy 1 of each, have them tested to actually see. I can find 8 of what I need but right now actually one is 15.9 ohm and 234 cc/min that I have seen flow tested so I can sat that's legit. Problem is I can't find another 30 for others if it gets to that. There are others.... waiting to hear from injector shop on some tests tomorrow. There are many options the issue is most are not made any more or they are like $250 each if they are made. Prefer to not stick 14 ohm ford units in there really want to stick at the 15.7-15.9 ohm range.
I think if you have success with this, at least it would have only been your own time and minimal outlay, the whole aftermarket ECU is all well and good but its not a cheap exercise!! I assume you'll be visiting a dyno soon for a baseline, and then using the same dyno after you've done the mods? I'm keen to see the results.....
I got some injectors on the way that i will send to fic to verify. Also have new 90 ms chips coming. I am 100% sure i can get 330-350 hp with acceptable AF, but new tb's wont be cheap. Ill prob base line in spring. Got another on ferrari idea taking bandwidth as well as work and family. As far as injectors i found thrm that are still availale kne via roxk auto actually. 2 diff ones actually. Will confirm one comes fro. Europe as its eutopean model, both Bosch. One 230 one 235 cc. So right at 24 lb at 3.4 bar if it pans out.
At normal, easy does it, cruising it was okay. But get on the loud pedal, off, up shift, and stand on it again = the Motronics DID NOT LIKE IT AT ALL! They would immediately throw CELs (1211 - Lambda regulation, additive value self-adaptation & 1212 - Lambda regulation, multiplicative value self-adaptation) on both banks. The dual ECUs could not affective manage the fuel and ignition time going between closed loop and open loop, when I was running the open plenum. Again Tuning, tuning, tuning, tuning. Is key. Tim’s Stooge chips/eproms are pretty darn good for the stock dual ecu-s. But in all seriousness the entire Motronic system needs to get ditched and replaced with a 21st century modern stand alone ecu.
Looking forward to the results on a Dyno, lots of fiddling about and so forth, but if you have the time, why not!!
Ok so here is the injector, 230 cc/min. I paid $25 a piece from injector reseller, plenty for sale reconditioned, also available new from Rock Auto but Std Motor Products. BTW I mis spoke the pre 11/90 348's were 3.0 bar had momentary lapse when typing. Fuel Injector Bosch 0280150749. You can see how similar it is to the 348 one. Heck they are even the same color. Bosch specs state 201cc for the 348 but many people see just under that, the fluid used to test can affect it a few % btw. Btw there is 1 more very similar one that is 240 cc/min. also available rebuilt but from Europe. Got some stuff to do currently writing software for a new idea and need to finish work shop cabinets arrived today. There is also a few 215cc injectors that I bet you can drop into the Spiders with no issue and run exhaust with high flow cats, remove MAF screens get additional 15 hp or so and the ecu should be quite happy. Also got some new 100 ms chips including and 2 authentic 90 ms ST Micro M27C256B-90F6 chips. Got focus else where currently including needing to do CAD for not related to the new TB but is related to the software I am writing. Only so much bandwidth and hobby money, currently it is being directed elsewhere.
This is why I always get injectors flow tested. We know what fuel pressure the 348 runs, but is that the same as the test pressure for which Bosch specify the cc rating of the injectors? I would say from my own experience over the years, getting an actual flow test and knowing what the cc rating is for the injectors at a specific pressure is valuable information. Those 230cc injectors may well flow a lot more at the 3.8 bar or whatever it is your fuel system is running, and that will affect your fueling as you know.... You might be able to have them tested at your given fuel pressure so you have a clear idea of where things are at. Mine were tested at 2 bar which is what the guys told me was their standard, I didn't think to have them test at the fuel pressure my car runs, I wish I had now... Also bare in mind, these cars are very well tuned when they are running right, my AFR at WOT was a consistent 12-12.5:1, you really don't want it to be much leaner at all, but if you are going to put bigger injectors in, it will need a lot more air too....as you know.... Looking forward to seeing how all this plays out...
"hose 230cc injectors may well flow a lot more at the 3.8 bar" Ohh yes you bet they will. There are several 215 cc injectors out there and at many near exact matches for 348 factory injectors.
