Bigger Injectors?????

Ok I am in the process of finishing up my swap from N/A to TII, I went with alot of aftermarket stuff so now im wondering when I take it in to my mechanic to have it wired up if I should have him install bigger injectors while hes in there?? and if I should what size?? I did the turbo swap the right way so EVERY thing is TII..drive line, tranny the whole 9 yards. Here are the mods to my car that will be or are installed:



no airpump

3" downpipe

3" mid pipe

3" single side catback

BOV

Aluminum TID

HKS cone filter

16" electric fan

Knightsport FCD

Profec A boost controler

HKS F-CON



I think thats all that would really matter. I am also thinking about ditching the TII fuel pump for a walbro. oh the car is a series4 So what does every one here suggest????? please help! Ive spent so much time on this thing I dont want it to blow up on me!! WIll my F-con work with bigger injectors?

Well my first question is do you have a stock turbo? How much boost do you plan on running? If you have a larger turbo and/or want to push more than 10psi then I suggest you go with larger secondary injectors. Does your HKS F-CON have an aftermarket wiring harness or are using the stock harness from the TII? If you have an aftermarket harness then I would say go with 1600cc secondaries. If you still have the stock TII harness then the only aftermarket injectors I've heard that fit it are 720cc secondaries. If you go with the 1600cc ones then you'll have to get a fuel rail to go with them too. You must keep in mind that the 720's aren't going to flow as much fuel as the 1600's. Less fuel = less boost = less horsepower. It all depends on what you want out of your car.

Well I have the stock turbo, stock wire harness. I just want to get it safely on the road with out running to lean or overboosting. im afraid that with the open exhaust and intake that boost will go to high, high boost with small injectors would make it run lean no? I am going to port my waste gate and that should help but lets say I put the car together and it runs 12psi but I dont want it to go past 10psi is there any way to do this? I have been told that a boost controler is only good for upping boost not lowering it is this true? Please bear with me this is my first turbo RX7 and im just trying not to make any costly mistakes. https://www.nopistons.com/forums/pub...IR#>/dunno.gif

Better safe than sorry, Just have your mechanic wired up some different connections or modify the injectors to make them work. You should get bigger injectors, after all that money spent you would have to be nutz not to. K2rd sells rails for $100-150, I got 1600cc secondaries for 100 a pop. but then again i don't know much about the F-con, somelse will chime in with some experience and let you know what to do.

you can only run stock injectors with an fcon



mike

i was about to say that mike https://www.nopistons.com/forums/pub...DIR#>/wink.png FCON IS FOR STOCK INJECTORS ONLY. if you want to run bigger injectors get a haltech E11 or E6K https://www.nopistons.com/forums/pub...DIR#>/wink.png

or a super AFC

well.... you can't use a S-AFC and a FCON i don't think LOL. there were talking about 1600's too LOL i don't think a s-afc will control that .... LOL

dont make me prove you wrong!

Well right now I dont have the cash to drop on a haltech but will go there eventualy. on another forum there is a guy with almost exactly the same parts as me and I believe he runs 720s with the fcon but I havent heard back from him yet.

so should I sell the f-con and get a S-afc??? for what I bought the f-con for I could sell it at a fair price and make some money on it. how much is the s-afc and could I control 720s with it? 720s seem to be what alot of people are telling me to go with so...............................

I believe the biggest u can run on a S-afc is 720s( unless you go the high to low impedance deal). You should sell it and buy a s-afc and some 720s then. S-afc is like 400-500 i believe.

You can get an S-AFC for around 315 + shipping. Just go to www.gothamracing.com. Yes the S-AFC will controll 720's. I have friend with this same setup on his 87 TII. BTW what year turbo and motor are you using 87-88 or 89-91?

go on ebay to get your s-afc

I got mine for 300 shipped, I got it yesterday



ed

wouldnt haltech be a bad choice for a boosted vehicle? doesnt it lack support for knock retard?

don't make me post the pix of the powerFC for a FC................. :smirk:

NO! you will want to purchase a wideband if running a haltech so you can tune and monitor AFR all the time. what do you think all the race cars run, haltech, motec, microtech, wolf, none of them have knock control.....

I dunno, the TEC3 supports knock retard afaik and has all the other features of the ones you mentioned. The wideband o2 sensor should be used regardless, it's just for safety, at least if you lean it out and start knocking it will take out timing faster than you will be able to react... **** just think, air in fuel line, injector issues, injector harness issues, retarding timing will lower the damage.



afaik alot of the fast ass grand nationals run speedpro (aka fast) which has knock retard, actually depend greatly on them since you need to run agressive timing to really take advantage of that motor.



I don't promote using knock for tuning. I however do promote preventative measures, if knock retard can help keep you from a rebuild if for some reason there is some detonation, by all means....

i didn't know the TEC 3 could do that i had one sitting on my floor and sold it. i know its a great unit. the problem with knock control as i know it. is that it is NOT accurate.... engine noise can sometimes times be picked up as knock and it only retards leading timing which COULD have the lead fire before the trailing........... just some issues for knock control on a rotary...........

I am using 87-88 motor