widebody2

at what point do you need to upgrade your injectors? I run 14 or 15 lbs with an m2 medium size ic and the rp fuel pump and I have all the other basic mods too, full exhaust, power fc and other crap. I didn't think I needed to upgrade but I just read something on another post that made me start thinking.

Flybye

You really shouldn't run your injectors past 90% duty cycle. You risk burning them out A good consesus is to upgrade the injectors and fuel pump once you reach 350rwhp. Some people upgrade their injectors before and after this amount of hp. The important thing is to watch that you don't run lean.

widebody2

my car runs pretty lean when I'm cruising at like 70. also at idle when the car isn't warmed up. when i hit the throttle it runs rhioch. i don't think any of that has to do with the injectors. i hope that is the way it is supposed to be. I am a little worried about the lean condition while cruising on the high way.

airborne

just as a heads up, with my mods (in sig) and running 12lbs of boost my injectors usually get up to 80%, and have touched 90%. so you should probably get to that soon. even if they provide enough fuel they will wear faster at that high a duty...

widebody2

Holy crap...yo every time I finally think I'm done, some one else tells me "now you need to do this or your engine will blow up" haha. when does the insanity end? Ok well they aren't getting upgraded till the spring anyway cause I'm only going to have my car on the road for a few more weeks.

Airborne I saw that you have the ACT clutch and lightened flywheel...how do you like that setup. I think thats what I might be going with. I just read in Mike Ancas' book that the lightened flywheel lowers your torque and causes the car to slow down a little faster between shifts. Did you feel any of that or do you just totally recommend it? Also with that clutch is the car still resonably easy to drive on the street? Thats all I will be using it for but I like to have it as fast as possible. Also need something that will hold with a lot of horsies.

user 84205

Its not suppose to be like that. Do you have a tuned computer?
shop done or Power FC or some ****. IT needs to be tuned better. Get an exhaust temp gauge. Then just watch your numbers and see if you ever go lean at all or, rich and adjust your computer as needed. This is why the POWER FC first came out with the comander for the RX7, cuz it needs to be tuned and re-tuned all the time. You only need big injectors with very high boost, but even then usually unless you have a side-port or any other port, then you wont need them. BUT!! if you get side-ported GET those injectors FAST or your new engine will be ****

widebody2

I have a power fc tuned for my mods by the rx7 store. Also the air fuel gauge is from autometer or something like that, you know the brand "everyone" has. What does an exhaust temp gauge have to do with my air/fuel? I never heard of them being connected.

JoeD

higher EGT = lean

lower EGT = rich

Styk33

Using just an EGT gauge is not going to do it for the A/F unless you know you have the correct timing set. Unless someone sat in your car and tuned it, it is not tuned right. Cars vary so much from motor to motor you can't just throw in a map and say it is tuned. What you have is a base map.

If you are not running enough timing then your EGTs will be higher. If you are running far to rich your EGTs will be higher. If you are running to lean your EGTs will be higher. So, how are you supposed to know what to do with just an EGT gauge to actually tune a car. Just using a basic O2 sensor is not going to do it either. You can get a variance of 3:1 on the A/F ratio without a good sensor and temperature compensation.

As far as the orignal question goes, if your injector duty cycles are not above 90% regulary (like what Flybye said), I would not worry about it. If you are happy with how your car performs, but need just a bit more fuel, go with a little more fuel pressure. The upgrade to 1300cc secondaries is pretty easy from what others have said on the forum. Plus with the P-FC you can adjust the fuel maps accordingly.

Best of luck.

Styk33

Forgot to mention about your A/F problems during idle and cruising. What A/F ratios are you seeing. Under idle you will be around 13:1 and partial cruising it depends on what vacuum/boost you are running, but it will not be as rich as WOT. These are things you should not need to really worry about unless your car is running poorly in those conditions.

Rev. Dr. Jay
http://ricemobile.net/