Hey guys I picked these up off of ebay. I was told they are 52's but the seller wasnt sure the manufacturer or where they were bought from. They were on a modded 86 951. Can anyone help me ID them and let me know if they are plug and play or if I need ballast resistors or anything. P.S. I do have the guru chips so I should be able to swtich the FGS swicth for them to make sure the programing coincides.

Thanks!
Zack


P.S. they are greyish-olive green in color and all stamped 6280 17104487

 

got a digital multi meter? if so, measure the resistance across the injector by putting a lead on each of the connector pins. should be somewhere around 2.5 ohms i believe. if so, they are low impedence and need ballast resistors. if they are high, like 12 ohms or so, they are high impedence and don't require ballast resistors. but, if they are high impedence, they are saturated switch injectors and have a slower response than the low impedence peak and hold injectors.

i don't think they are delphi/rochester products injectors, may be siemens (based on part number given).

 

They look like the Siemens injectors I had in my last 951.

 

I have a set of greyish-olive green injectors (no longer in use), I will check the part number this afternoon.

Mine came from Huntley Racing several years ago and are Rochester 50lb high ohm.

 

lool like Delphi to me
here are Siemens

here are Delphi

 

The resistance is 12.3 ohms so i dont need the ballast:-) But Im still not sure the manufacturer or the real flow rate im thinking 52 or 55...Also I think the different manufactures flow a little different If these are not the Delphis Danno sells anyone think I might have a problem just switching the FQS to the 1 position?

Zack

 

ski might be right, the delphi part number though starts with 25...... i think. at least that's what the performance division at delphi told me when i was looking, could just be an internal part number though.

find out for sure if they are low or high impedence. might make a difference (if you care).

 

Bret,
Mine definitly look like the Delphi, which I think is a good thing! but I thought Danno sold those and they needed the Ballast resistor? anyone else want to chime in they do look identical to the Racetronix picture above...


Zack

 

The resistance on all 4 differs slightly 12.1, 12.2, 12.3, 12.5 is that normal?

 

that could just be measurement error. they are basically the same injector. if they are delphis, they are different than the ones danno sells. these are saturated switch injectors, danno sells peak and hold injectors. the difference is in how they operatre. the saturated switch get the same current throughout the pulse, which can make them open slowly. the peak and hold have a high peak initial current to open the injector and a lower current to keep the injector open during the pulse.

 

Those are 50 lb/hr Delphis.
But they're high imp. so you can't use them in a 951!

 

Thats what it seems like I got this from Dannos website

"Conversely, using high-impedance saturated injectors pose an incompatiblity due to the Motronic's peak & hold output signal. The initial high-voltage 'peak' blast to open the P&H injectors can overheat and damage a high-imp. saturated injector. And the low-voltage 'hold' period is lower than the saturated injectors' design-specs, thus you'll have inconsistent metering as there won't be enough current to hold those injectors fully open."

Thats really dissapointing since the guy I bought them from supposedly had them running great on his ~340hp 86 951...

If I were to sell these on ebay what applications would they work for?

Zack

 

You can use high-impedance injectors, just that they won't give you the best performance. Subtract about -20% to -25% from the total-flow rate for high-Z injectors to get their effective rate when used on our cars. This is due to their slower opening times. A lot of the Japanese cars like Hondas, Eclipses, Nissan use high-ohm injectors.

 

The part # on mine are 4249 17104487
When I sent them to Marren Motorsports for cleaning, they were identified as Rochester 50lb high impedance,saturated.

They can be used on our cars, but you should use the correct peak and hold for best results.

 

Well If I subtract 20-25% that kind of bring me not too much more than the stock flow rate provided these are 50's... I was told by the seller these were fine on a 350 rwhp car. Is anyone interested in them I paid 200$ and would like to sell them and break even I was told they have 250 miles and they look new

Zack