Filosi723

Hey, I'm still new to the forum and modifying my car (87 TII). I plan on doing these upgrades and I have questions about a few.

Racing Beat REV TII
Port wastgate
Manual Boost controller
Boost gauge
Wideband o2
Rtek 1.7
750cc injectors (secondary)
Fuel pump upgrade with re-wire.

My first question is about the injectors. When I replace these do I need aftermarket clips or will they bolt right in? Also how do I wire a resistor in for high impedence injectors?

Second question is what fuel pump should I use? I'm looking into a walbro 255 or is it better to go with the FD pump?

Last question is should I be able to run all these and have a dependable daily driver and is there anything I am missing that could cause a problem??

Please help.

RotaryRocket88

iTrader: (7)

That depends on if your car is an early or late '87. If you have a resistor pack (4x 6 ohm resistors) up near the airbox (not be confused with the resistor/relay in the same area), you have low impedance injectors (2-3 ohm) in the car. Most aftermarket injectors are also low impedance, which means you wouldn't have to do anything to use them. Using high impedance secondaries would be more complicated. You'd have to bypass part of the resistor pack (or all & wire in 2 resistors for the primaries).

If your car is a late '87, there will be no resistor pack & you'll have high impedance injectors (12-13 ohm). High impedance aftermarket injectors would drop right in, but low impedance injectors would require resistors wired in-line.

The easiest place to wire in resistors is at the ECU. Here's a shot of my ECU with a 1.7 chip and four 6 ohm 10watt resistors spliced into the injector circuits: https://www.rx7club.com/attachment.p...6&d=1222058265 The four light green wires on the harness are for the injectors.

An FD pump is the better option. A walbro does flow more at high pressures, but it also flows more at low pressures. This means the stock FPR gets overrun at idle/low throttle, and you end up with extra high fuel pressure and overly rich mixtures.

Your list looks good. I used a 1.7 chip for about 6 months before switching to the 2.1 to control the mixture better. You'll have to see what your AFRs look like. Mine were a little borderline under boost (~ 12), so I opted to go a safer route.

Filosi723

Thank you RR88! I appreciate the help. But I'm still not sure what I'm going to do. My exhaust order just fell through and I only have a 3 weeks before I have to put my car on the road. I think I might wait until summer and do the Rtek 2.1 and the goodies. But I'm also in a bind because my stock exhaust cat is falling apart. The honeycomb inside is sideways and I'm afraid it could harm something, plus I have a leak toward the back of the exhaust. Could this harm anything? And if so should I order another exhaust asap and port the wastegate so I don't creep hard?

RotaryRocket88

iTrader: (7)

Hollow out the cat if it's falling apart. It will clog up on you, and you'll suddenly have no power. You could also end up with pieces rattling around your mufflers if they break off. If you still have a pre-cat, and you're using the stock intake/TID, boost should still be under control. The ECU has the built in safety of fuel cut at 8.6 psi if you were to overboost. It's harsh, but effective and better than a blown engine.