mattipuh

tried to seek newer type injector which would meet following criterias
- newer type
- at least same fuel pressure or higher
- at least same flow or higher
- somewhat same resistance

couldn't find it.
new type injectors seems to use lower resistance (12ohms quite common) (dunno if it's problem?)

I sent email to Bosch Motorsports, wonder if they'll provide answers.
dunno then if there's something changed in the newer type injectors (if they could be run with lower ohms or fuel pressure, or such...?)

Miles968

This is a very interesting topic! Thanks to everyone who has and is researching it. Especially to Carl for his continued development of the supercharger project! I am eager to hear what comes of this and I will speak with my mechanic as well. This seems to be a break through for our cars if we can find the "right" 3g injectors.

rdhayward

My reference for the specs can be found here:

http://injectorrx.com/boschtf.html

But I also found a chart that says these injectors flow 32.5 lb/hr:

http://www.justfuelinjectors.com/ser...flowchart/Page

The latter chart also has duty cycle numbers. I believe (but am not certain) that the OEM 968 fuel pressure regulator is rated 56 psi.

So, I think the 32 lb/hr Ford Motorsport injectors would be correct, at least theoretically. I'm more likely to try a set of Accel injectors (PN 150132).

FRporscheman

If there is a 3rd gen Bosch injector we can use, but the impedance is too low, we could simply use ballast resistors to make it work, right?

John Etnier

Placing resistors in parallel would drop -resistance-. The change to impedance could be a bit more complex. I don't know how impedance-sensitive this type of circuit is (impedance and resistance are not the same). At any rate, rigging a stable, permanent installation of such a resistor would not, I'd think, be easy.

Carl Fausett: any chance you can tell us what product you used?

rdhayward

I would bet Carl used much higher flowing injectors, perhaps as much as 50 lb/hr.

Miles968

I pulled my invoice from my rebuild in 2003 and found this description of my current injectors
"PH 52#/HR BOSCH-STYLE INJECTORS -- with correct high impedence" I am not sure what generation they are. Anyone know when the "3g's" came out?

FRporscheman

I know impedance and resistance are not the same. However resistance is a type of impedance. I'm not suggesting the resistors be put in parallel, but in series, to raise the impedance not lower it. I have never tried this (and I won't pretend to know the first thing about the DME, injectors, or the circuit) but the only reason I bring it up is that I read about 951 owners doing this all the time, and it apparently works for them.

Obviously an injector with the right impedance out-of-the-box would be ideal.

rdhayward

Clark's Garage has a write-up about that. Apparently, the 951's OEM injectors are unique in having 4.5 ohms. Scroll down this page to the heading "Fuel Injectors:
http://www.clarks-garage.com/shop-manual/951_eng_perfmod.htm

Also, Clark's Garage has a different listing for 968 injectors, Bosch 0280151911:
http://www.clarks-garage.com/pdf-manual/fuel-12.pdf

Bosch's own website gives PN 0280155010 as correct for the 968. Interestingly, the PN 0280150911 injectors flow 30 lb/hr and are OEM for the Ford 3.8L supercharged V6.

Richy_s

Resistance and impedance are the same thing in a dc circuit.

Rich

John Etnier

I stand completely corrected: I was in a bad place last night. I KNOW all this. Sheeesh.

PorscheG96

Carl says in the supercharger thread that he's selling sets of 4 of these Bosch injectors for $300, so if folks want to upgrade then you know who to call. Most of us could use an injector rebuild at this age/mileage anyway so you can't go wrong.

rdhayward

True, but with all due respect to Carl, he's gotten a lot of free input and advertising here for his supercharger kit, and no doubt will make a profit from it (albeit, eventually). I can't imagine why he'd consider the injectors such a trade secret for those who are unlikely to supercharge their cars.

RajDatta

It's part of Carl's R&D and I can understand him not wanting to share that with others. Why should he? He is the one that found this setup.
As far as free input and advertising, he is a paid sponsor, and promotions/advertising are part of that package. Carl has been a class act through his thread and I doubt many have actually provided him input that he could use. He knows what he is doing, seems to know a lot of supercharging.
So far, he has not sold any kits, so the advertising hasn't done much for him, has it? I think the least people can do to appreciate him being open with his secrets is to purchase the injectors from him. He is a rennlist sponsor who developed something for our community.
How many other vendors would share this information openly? I for one, would hope he holds information on these injectors as close to his chest as possible. $300 is a paltry sum. I doubt he is becoming a millionaire selling injectors.
Regards.
Raj

PorscheDude1

I think with little research the injectors could be found very easily.

With so many skeptics out there about anything 968, I doubt anyone is
gonna go out and buy upgraded inje tors without supporting mods or tune.