In case anyone was going to attempt to use MKIV TT Supra stock 550 injectors they dont work. Just letting you guys know.....Guys its back to dsm trader huh?

Tom.

 

What happened? Why don't they work?

 

I could have told you that. Should have done a search first....i remember this topic being asked no more than 3 months ago.

FYI: The mkiv injectors are 550 peak and hold BUT they are side feed.
If you want injectors that will work for us you will need to find some Supra mkiii injectors. They are top feed and 550--i think they are 550 pretty sure though.

 

Try to find some 550cc top feed FC3S Turbo II RX-7 injectors. They are the same impedance as OBDI teg injectors .

Top feed JZA70 Supra 7MGTE injectors are 430cc.

 

In more depth on the RX-7 injectors

86-92 Turbo II

86-87.5 are peak and hold type
87.5+ are saturated type

84-85 GXL-SE

680cc **peak and hold type** (2 per engine) - These damn things are rare to find, trust me I tried.I got a hold of oneset in hopes that I could get some low buck big injectors.

The 1st gen 13b powered (84-85) RX7's had only 2 injectors per engine. Though this wasn't a very effiecent setup. The newer(86+) 13b's had 4 injectors. This worked better as the addition of more injectors allowed for a "stepping" technique. At idle up to around 3500 RPM or so only 2 injectors are firing(primaries) When the engine goes above that RPM the 2nd pair of injectors(secondaries) come in to provide molre fueling. Something you have to understand about rotory engines is that they have no real "power band". As long as you can keep fueling them ans feeding them air(this is where the turbo(s) help) they'll continue to make power.

Most turbo rx7 owners chunk their secondaries for larger ones if they are going for performance. Upgrading the primaries isn't really necessary, becuase of the way the engine works. This also lets them keep there nice stock idle quality....

Though those damn wankle engines are notorious for being 60K mile time bombs.