550cc vs stock. how can i tell?

[BOOSTEDSUPRA]

ok, i have 2 mkiii sups. one 1990 that has a bad turbo and has the lexus afm on it, and was told 550cc injectors. i know one way to tell if there 550 is to look for the new clips splice in. i do not see that. are there plug and play injectors? can they be the injectors off the same car the afm came from? if so how would i tell? i am inquiering cause i want to put them on my 87 which has more mods and runs fine, and to sell the 90. any help would be great, and thanks again in advance from your friendly neiborhood supraman!

 

[supraguy@aol]

The plug and play injectors are Denso's, and possibly some HKS units. The Denso's have a pinkish red color to the top area.

 

[Zach]

You crank up the boost on the car and hit the dyno.

If it leans out and blows up at 450whp you've got 440's
If it leans out and blows up at 550+whp you've got 550's

Best and safest way is to send them out to be cleaned and flow tested. That'll give you guaranteed info and peace of mind.

 

[LordLo]

The injector clips are different also the resin is black. I believe stock is gray.

 

[starscream5000]

Another plug and play larger injector is Venom, pray you don't have those in the car. Try not to drive it until you verify.

 

[supraguy@aol]

I misread your original post. You shouldn't put post 88 injectors(high impedance) on a pre-88 car(low impedance), because the injectors will be slow to open/respond(though you can put low imp.'s into a later car). If you want 550's in your 90 car, best to go buy some.

 

[starscream5000]

Aren't high impedance injectors on NA's only?

I was under the impression that all turbo MKIII's regardless of the year, had low impedance injectors :dunno: