Replacing pulsation damper and now injectors, your adive please :)
 

Currently I am replacing my pulsation damper (if I ever get the part :mad: ) and having taken my intake manifold off like 4-5 times now (dont ask why) I have lost some black small O rings (i'm pretty sure from the injectors but not possitive, but you get the idea somewhere from the bottom fuel rail, they just kept poping up :confused: ) from somewhere around :eek: there and the wires from 2 of the injectors have cracked, along with two of them have the plastic part that sits on the "injector" itself has broken and now fallen off, although they are still "going" I'm thinking of having them exchanged out for some new ones.

Along with this pulsation damper I had to fix the O ring from my intake manifold which was leaking/burning coolant <--fixed!! At the same time I ported my wastegate, seeing as to how I have a RB full blown expensive as hell exhaust sitting since, ahhh last year!! Now that I have been waiting and waiting for my pulsation damper order from 1987rx7guy for way way too long, I give up and decided i'm just going to buy a new one. During this "waiting" period my financial situation got much better and I feel like its well worth the investment to buy some inj's.

Now that that is settled for me, I would like to know as to how to go about it the right way. I want to not just get new inj's, but to rebuild my whole fuel system. For this, it means I need to start out with a new computer (right?), I will do some reasearch, but as always nothing is a good as getting the info from someone who was there and done it first. (No need to reinvent the wheel!) Your thought please would be greatly apprieciated, whats a good computer/injectors/fuel rails the basics, however first I would just like to get the blueprints into works.


P.S. If your reading this and your thinking to yourself, ahhh! another noobie, who doesnt know what he is doing, please your the one I need help from and although I am a noobie in cars I'm not in computers and when I come accross a thread like this on a computer forum I think the same thing however I just think to myself, pass it on! :) Thanks in advance.


My car is a
1987 S4 t2
I have the downpipe on however not the rest of the exhaust, I also have the fuel cut defender and I am now ordering a pulsation damper from mazdatrix.com and no i dont wanna do the banjo bolt fix, even though I completly agree it fixes the problem but i dont wanna risk having the newer inj's blow or the flow/pressure change with higher cc inj's.

*bump*

goddamn Newbies!!!!

just kidding. you dont need to get a new computer for new injectors. you will need at the very least an S-AFC to tune down the extra fuel flow so you dont flood out at idle and low throttle. just make sure your NEW injectors match the impedence of your old injectors for straight plug-and-play compatability.

you can go from low impedence injectors to high's cuz cars that use the Low's also have a resistor pack located under the stock airbox. this bumps up the total resistance/impedence by 10 ohms (usually... mk3 supras only go up 6-7 ohms) if you find high impedence 660s or whatever, youll have to remove/bypass the resistor pack... if you even have it. i forget where the cut-off date is for low impedence cars and high impedence cars. i think after june of 88, they switched to high impedence but im not 100% sure. im willing to be you have low impedence injectors. you can get some DSM 660's for your secondaries if you want. they sell them all the time on DSMtrader.com.

anywho, if the Orings you keep finding look like big bulky O-rings, almost like Lego tires or the size of Matchbox car Tires, those are injector pintle grommets. those sit inside the bungs on the intake manifold and seal the tip of the injector to the manifold. its a good idear to replace these everytime the injectors come out. they can be hard to find cuz no one ever lists them as injector "grommets". i had to get mine from a Toyota Dealer and were like $2.50 a piece. you should only have one other o-ring which usually stays attached to the injector itself where it inserts into the fuel rail.

if you want to upgrade your fuel system, its pretty easy. you can order some 8AN fuel line and fittings from Ebay or something and run them to a Y-block so you can have parallel feed fuel rails for youre primary and secondary rails. if you run the fuel thru the primary rail and then thru the secondary (or vice versa) you risk running leaner than you want due to lack of fuel pressure by the time the fuel gets to the second fuel rail. but anywho, you can run the 2 feeds to your Aeromotive SX afpr and run a 6AN return fuel line to your tank.

for a fuel pump, you could do a walbro 255... its usually enough. i would rewire it though w/ a 30 am auto relay and some 8 guage cable straight from the battery to get good voltage and clean current.

hope that helps you