...about those injectors. Info?

[addicted4life]

Been reading around about injector upgrades and am kind of fuzzy on the details with upgrading and the new/old style, whats size is compatible with what , as well as 300 degree fuel rail setup. I understand a little but basically what im trying to do is build my car for about 600whp in the distant future (am still toying with the idea of single big turbo if that matters) I'm upgrading my fuel system a little while I have my motor out for the rebuild. Already have new walbro fuel pump, but what should I be looking for when it comes to injector setup? 300 degree rail? Nismo, Sard injectors (after a little research I want new,not reman or drilled) ? Any special lines for 300 degree fuel rail?

Thanks guys
Brad

[Z31toZ32]

the old style injector coil will short out eventually due to ethanol in the gas and also due to a constant 12v circuit delivered to them. the new style injectors are pintle less and aren't subject to this failure. so, you will definitely want a new style injector.

the general consensus here is to use the nismo 740cc injectors. they will be able to support your power needs and are the best off the shelf application.

you should not need an upgraded 300 degree fuel rail i you wanted to cut corners, but with a higher hosepower application it makes tuning easier. if you are balling out to 600 hp id probably spring for that setup.

not sure on the fuel pump. the stock tt pump can support madd power, but im not sure what the cutoff is where you would want to add another one. someone else might need to chime in on that one.

[addicted4life]

Yea alot of the guys here are running high hp (550-700whp+hondas) run walbro pumps and all recomend new pumps every two years minimum as they have blown motors when a pump lets go. So seeing as my pump is most likely the original I sprung the $98 for a new one, now that might be a honda guy thing but they are running some big power in little 4cyl.

When I searched for 740 nismos I wasn't sure on which ones to get and if they would clip right in so thought I would ask on here.

[bartZ32tt]

When you say "clip right in" - no, you need to solder the new style connectors into your existing injector wiring since you're pre-95.

[DCaff300ZX]

You also may want to consider this JWT adapter kit for the new style injectors, the info given on the kit demonstrates the need/advantages of using it...scroll down three from the top for the adapter kit:
http://www.jimwolftechnology.com/news.asp

[CrazedZ32Owner]

I bought the 740cc kit from Z1 when the factory ones crapped out on me, that was 2 yrs ago and i haven't had an issue with them yet.

[addicted4life]

Ok so it basically comes down to the only good injectors for our cars are the Nismo ones? There are no other manufacturers out there making larger ones (not reman or drilled)? I've been googling it and havent had much luck finding out for myself.

[Z31toZ32]

i think some higher horsepower applications on here use sard injectors. they make an 800cc and 1000cc. but with 600 hp there would be no reason to go that big. you can do whatever you want, but those are serious coin and you would have no added benefit.

there are actually a lot of brands of injectors avalable for our cars, but all the pros that make a living on these cars recommend the nismos.

[jedijeff123]

Yeah, like Z31toZ32 said, they crap out thanks mainly to the constant 12v(it attracts a ton of corrosion, on the connector and within the injector). If you weren't going for 600whp, I would get an FMU to raise the fuel pressure at an adjustable onset...it's what I plan on doing for my TT, but I'm only shooting for 400whp-ish.

[addicted4life]

Yea I'm shooting higher, 550 at least but 600 is my goal. Started looking into the "Injector Dynamics" 725's and have yet to see anything bad on them. Starting to understand a little about what injectors fit what style I think, I'll need to get the fuel rail or at least the kit that was mentioned above from JWT
On the plus side I should be moving my car into a shop soon enough so I can start working on it a little.

[vulcanrush]

Been reading around about injector upgrades and am kind of fuzzy on the details with upgrading and the new/old style, whats size is compatible with what , as well as 300 degree fuel rail setup. I understand a little but basically what im trying to do is build my car for about 600whp in the distant future (am still toying with the idea of single big turbo if that matters) I'm upgrading my fuel system a little while I have my motor out for the rebuild. Already have new walbro fuel pump, but what should I be looking for when it comes to injector setup? 300 degree rail? Nismo, Sard injectors (after a little research I want new,not reman or drilled) ? Any special lines for 300 degree fuel rail?

Thanks guys
Brad

do you know what 600rwhp involves? walbro fp's are pretty unreliable, if they tell you they need to be replaced every two years, why would you run them?

[addicted4life]

Not entirely nope! Haha I have a basic idea but it all a learning experience as I go along, not saying I haven't been around cars before but rather my car is the learning experience. From what I'm told here they aren't unreliable so much as guys don't want to have them wear out on there cars and blow so they replace them all the time. I was hesitant to buy it in the first place as I didn't know much about my stock pump and it's integrity at that point. Actually owning a turbocharged car is something relatively new to me, I've been around them just never owned one.

[BigTDogg (MA)]

OEM TT fuel pump is good for 600RWHP easily. New, in perfect condition. A 20 year old one, wouldn't bet on it.

Injector Dynamics are good, but IIRC, they're all top feeds, so you'd need a BDE (recommended) or Win Factory top feed rail kit.

IMHO, get a 1995 EFI harness next time your engine is out. It incorporates the +12VDC work around and has new connectors all over it. It's the best $400 you can spend for the longevity of your car.

In short, for side feeds, Nismo or Sard is the way to go. Top feeds, ID, Bosch are good units.

[NolimitZ32]

Sidefeeds - Jecs (who make OEM injectors 120cc-880cc IIRC) and yes they make nisoms too

[vulcanrush]

Sidefeeds - Jecs (who make OEM injectors 120cc-880cc IIRC) and yes they make nisoms too

right, but the jecs themselves are redrilled, tougher to tune.

[BigTDogg (MA)]

Correct. Jecs in anything but OEM size are garbage.

[NolimitZ32]

No they aren't, JECS is a manufacturer of injectors, worldwide OEM manufacturer. They provide large fresh, brand new injectors to lots of auto manufacturers, I'm trying to find the site right with a catalog of sizes but I know for a fact that they make a new (not redrilled) 800 something cc injector, which is a pintle-less injector with a wide open cap.

Tony, the factory yellow sidefeeds in your legacy are JECS 520cc, same ones that were in my swapped bugeye, same ones i just put into the Z. stock, not redrilled, comes in the car from the FHI - Subaru Division plant in Gunma.

EDIT: Can't find the catalog but here is Witchhunter's list of all the injectors they have tested, these are not all produced by JECS but you can take a look at the 0D20, 520cc @ 3bar.

[vulcanrush]

No they aren't, JECS is a manufacturer of injectors, worldwide OEM manufacturer. They provide large fresh, brand new injectors to lots of auto manufacturers, I'm trying to find the site right with a catalog of sizes but I know for a fact that they make a new (not redrilled) 800 something cc injector, which is a pintle-less injector with a wide open cap.

Tony, the factory yellow sidefeeds in your legacy are JECS 520cc, same ones that were in my swapped bugeye, same ones i just put into the Z. stock, not redrilled, comes in the car from the FHI - Subaru Division plant in Gunma.

i understand that, Anton, jecs makes oem injectors and even nismos.
but the ones that get sold as JECS, not nissan or nismo, are redrilled.
(and i'm only speaking for the nissan 300zx, not the subaru platform, i don't know enough about them to comment)

the subaru oem ones are made by jecs, the nissan oem 270cc and 370cc ones are made by jecs, the nismo ones are made by jecs.

but the JECS-branded ones are redrilled, i can understand the confusion.

[NolimitZ32]

Every set of JECS I've seen being sold, is sold as new, whats more I am more inclined to believe that the 740s they sell are the exact injectors that are sold as NISMOs simply because they appear to be the same, I won't argue that the AM units sold for our cars may be redrilled but I will go to the mat on the fact that JECS makes big injectors. That being said and as Tony and others know I am 100% not a proponent of redrilled injectors. What doesn't make sense to me is why JECS would provide 740s for NISMO with the correct caps and manufactured to OE tolerances but then produce the same 740s under their name with redrilled caps unless someone is selling "NEW" JECS injectors with redrilled caps in which case I see a lawsuit on the way.

[BigTDogg (MA)]

That's what everyone thought Anton, until Harry and Greg and Ash began tuning with them. The JECS marketed at 740s do flow 740cc/min at 100% duty cycle, but from 0-100 is so non-linear, it makes them very difficult and finicky to tune. I'll try to dig up the threads if I get some time.

FWIW, the only ones I know of being complained about were from CZP.

[BigTDogg (MA)]

See here

[NolimitZ32]

Ive seen all the threads on TT, I was just hoping that a company as huge as JECS Unisia wouldn't cheap out like that, so I'm guessing someone is selling new re-drilled JECS units making 1000cc units out of 270s. Shame.

[t.mcginley.jr]

Do the walbro pumps really crap out after 2 years? Or is just insurance to change it out after 2 years because of the high hp abuse they get?

[addicted4life]

That's what my buddy's me, one of them has a 760whp integra and he changes his every year. $100 every two years to ensure your motor doesn't get starved. I haven't checked but what does a new oem one run? If they are more then capable in a new state then maybe that's a better option even of it costs a couple hundred for new

[NolimitZ32]

Ive had mine for a while but the car has seen like 3000 miles since I put the pump in so I can tell you pure age doesn't kill them lol.

[addicted4life]

Ok, so I have a line on a set of barely used injectors for a good price. My question is will they fit and work??

A set of (6) HKS Denso 1000cc top feed low impedance w/ 2 resistor boxes out of a mkIV supra and an rb26 before that. Being top feed I see that I will need the 300degree fuel rail or the adaptor kit but will they work with that guys? Thanks!!


EDIT

[NolimitZ32]

There is no adapter kit that will make top feeds work, you need the BDE fuel rail. I don't know about the resistor boxes, what impedance are the boxes because the stock injectors are high impedance.

[addicted4life]

I think the boxes are just extra to make them low impedance so of no use to me. Do I need bde or will 300 degree work? Ill never use the bde to its full potential and it seems to be about $1000 more then the 300 degree everywheres I look
Thanks for all the help guys

[addicted4life]

Injectors are high impedance, resistors boxes makes them low impedence***

[vulcanrush]

I think the boxes are just extra to make them low impedance so of no use to me. Do I need bde or will 300 degree work? Ill never use the bde to its full potential and it seems to be about $1000 more then the 300 degree everywheres I look
Thanks for all the help guys

they (the bde's) also come with fuel injectors, probably the best available (injector dynamics) so they're about the same price if you were to get nismo740cc fuel injectors with the 300d fuel rails, etc.
300d are side, bde's are top and give you more flexibility, to run e85 later if you want.