Whats involved in fitting s13 injectors
 

As the title says i need to know how to fit them, iv done a lot of searches but im un sure

Can they be fitted to the std fuel rail or do i need a custom one if so where can i get the work done

Do i need a dropping resistor?

Do i need an adjustable fuel pressure reg if so what type and can some one point me in the right direction ie make model supplier etc.

Im going to be using the apexi safc 2 to make the adjustments and iv already
got a walbro, t25, exhaust, colder plugs etc

Any help would be greatly appriciated

if i remember right, the standard injectors are 8mm and the s13's are 10mm.

is the spacing the same for the s13 fuel rail?

try a search on www.club-s12.org/forums as loads of the US boys have done it with a safc-II :rolleyes:

s13 injectors can be made to fit the standard rail. you can force the rubber connectors over the top of the injector (crude but it can be done)

its best to have a custom rail made

the s13 rail wont fit a Silvia (s13 have equal runners silvias don't)

if you have some way of controlling the injectors its prob best to use a adjustable fuel reg

you only need to add more fuel above 1bar of boost

Cheers got a safc 2 now and all the bit like injectors, both fuel rails, so ill look at whats involved, cant be too hard! the safc looks pretty easy to wire in. what type of fuel pressure reg do i need?

iv used FSE fuel regs with out problems

I had to bin my FSE reg. It wouldn't maintain stable base pressure.

So you'd be driving along, have a boot and then it would remain on high pressure.

ive got a 2nd hand fse reg on mine, and it seems to have given me a missfire once or twice, in low revs, on anything more than light throttle? also sometimes it makes the idle unsteady? so think i might bin/ebay;) it....

so what reg would you advise i get?

I used a webber one as used on the sierra cosworth.Its adjustable and reliable.

cheers for the replys, iv been scratching my head thinking about how to install the injectors, and have a few ideas

1. Fabricate a fuel real from aluminium bar and get it welded etc as many people have done

2.Make a fuel rail using high quality fuel hose and metal t pieces, i seen this done on a few engines buy professionals, easy to do but what do you think?

3. try and adapt the original CA18ET fuel rail

Personally i like option 2. as its the easiest and cheapest ill see if i can post a picture to show you what i mean.

Any body got any thoughts on this?

Attachment 60

Heres the picture of the "flexable" fuel rail

anyone got an opinion on this?

It will work providing it don't leak

good quality pipes clamps and t pieces should do the job!

ive just got a bit of bent pipe with little bits welded on for the injectors:)

http://i45.photobucket.com/albums/f8...t/IMG_1372.jpg

ok cheers, now iv got all the bit together now and am going to install the apexi this weekend the injectors some time after that, when i do install the s13 injectors obviously i will need to play with the apexi safc

i plan on getting it set up by proffessionals to get the optimum performance from it but as an initial set up to make the car drivable if i reduce the fueling by 27% at each rpm point then will that be ok

27% come from the fact that s13 injectors are 27% bigger than standard

iv also fitted an s13 tb so i can use the TPS so it can be mapped for part throttle.

an advice from anyone who has used this would be appriciated

also do i need to use the dropping resistor with the s13 injectors?

You are correct the adjustment is -27%

Even if you didnt use the s13 TB, the TPS's are interchangeable. I guess you'll have to wire it directly to the SAFC.

Nope, you dont need the dropping resistor

ye iv got 5volts across the tps and wired the output to the safc, thank for the info, id be lost without it!!

Which plug did you use. There's 2 plugs on the s13 TPS, one is a variable type and the other is an on/off type?

i used the variable one its on a flexable wire coming out of the sensor all wired in now need to sort the injectors out and an s13 clutch as mine has started to slip its only done 20k.

then off to someone like DP motorsports or rc devlopments for a mapping session