So i just was wondering. Ive read here about upgrading the z with ninja 300 injector? Just wondering will it be a plug & play kind of upgrade? Also what are benefits from this. Sorry in advance if dumb question
You don’t “jet” EFI bikes with injectors. If you do swap to the 300 injector, FOR SURE you need a self mapping tuner or dunk time to have any chance on getting it to run right. We tested quiet a bit, and the OE injector handles our 155 stroker just fine, so unless you’re doing a package larger, don’t bother....So i just was wondering. Ive read here about upgrading the z with ninja 300 injector? Just wondering will it be a plug & play kind of upgrade? Also what are benefits from this. Sorry in advance if dumb question
Drop me a contact Mysta, I just updated to the 165 with Stroker = 177 as well. Had a couple of questions for you.Agreed, I have the kit from mnthbx but I swapped to the 165 kit which brings it to 177 and I can't imagine using the 300 injector on anything smaller. Most of my map is pretty low. That said I wouldn't use the stock injector on anything above 165.
No I have a 177 kit and a lot of porting. In my fuel maps with the 300 injector I was running large negative numbers. It runs real good but I wanted to check with them to make sure it was OK. Dynojet said the only issue could be is if it didn’t idle properly because it injector so big. Mine idles fine so, I just wanna make sure I have the optimum size injector. When I ran the stock injector with This combination the stock injector had huge positive numbers and I felt it was better to try the 300 injector. Just did not want to run out of fuel on the top and red lineCorrect me if I'm wrong........ but it sounds like you are determining injector size by how it idles?
I somewhat frequently call "Dino" jet since I work with their "dino's" on a semi regular basis for about 19 years now. Under no circumstance has idle been a measure of how "ok you're fine". Pretty sure DynoJet would agree with me.
Looking forward to helping. We need more details please.
thank you for the reply. I do think I’m close to being right where I need to be. I‘m just not used to large negative numbers on my PCV’s. I have few on other bikes and they are all much more positive numbers. Right now I’m running 13.6 in the Low rpm cells say 1500 to 3000 then 13.2 in the higher. She pulls real good to 11k or so in the lower gears and lags a little in the higher but I guess that’s to be expected.The stock Z125 injector is rated at 105cc/min and a Ninja 300 injector is 200cc/min so you must adjust for an almost 100% increase in maximum fuel flowrate. Your larger engine likely requires a flowrate somewhere between those two figures. I'd expect to see high positive trims with a small injector as the controller is trying to keep it open longer but at some point it physically may not flow enough fuel (at reasonable duty cycles). The only option is to install an injector with a greater flow rate and then you might have to enter negative trims to limit the flow rate to match what the engine actually requires. The observed AFR at full throttle is what should dictate if the injector is too small or too big. The point brought up about idle quality is often heard when the low RPM flow of a big injector can't be properly adjusted down by the fuel controller. If it's idling & running well with safe AFRs then it sounds like your tuning is very close to what your bigger engine needs.