rx7b13

Quick profile on the car for informational purposes, then onto to my question.

88 T2
High imp system fom factory
factory 550cc hi imp primary injectors
marren 750cc low imp secondary injectors w/ resistor wired inline on injector wires (done by previous owner)
stock engine
stock turbo
stock intercooler
N332 ecu (I thought the 88 T2 was supposed to be N333)
turbosmart manual boost controller
rb fuel cut defender
corksport catback
autometer 30psi boost gauge

now onto my question.

previous owner told me there was a boost leak and thats what the cause of my lag is. The way the car behaves is that when you're getting on the throttle you can watch the gauge and it goes up to 8-9 psi as the revs climb. I assumed that with a boost leak it would'nt read pressure juding by the videos I watched, but this is not the case. Now when I get up to 6k rpms you can really feel the turbo kick in and while watching the boost gauge while this is happeneing, you can watch my psi drop from 8-9 psi down to 5 psi all while you are feeling the burst of power in the high revs. I've been researching and read that larger injectors can cause hessitation/lag if you are running the factory ecu, and I am wondering how exactly does larger injectors cause hessitation/lag? Is it because it can't compensate for the larger injectors? and if so then should I install my Microtech LT8s that I have sitting on the side? I dont want to add my Microtech to mix until I got these bugs worked out, unless the Microtech is the answer to fixing them. also at idle according to my autometer gauge I running -20 in/hg at idle. Any input is greatly appriciated.

satch

iTrader: (1)

The factory ECU was designed for 550cc injectors and not any larger.

N326 - 86-87 NA
N332 - 87 Turbo
N327 - 88 NA
N333 - 88 Turbo
N338 - 88 Vert
N350 - 89 NA California
N351 - 89 NA
N352 - 89 Vert California
N353 - 89 Vert
N370 - 89 Turbo

rx7b13

Now I have the N333, I wonder why the previous owner put the N332 in, unless its because of the low imp injectors. Should I put the N333 back in, it came in a box of stuff when I bought the car.

satch

iTrader: (1)

All ECU's want to see high impedance thus the need for the resistors thus the ECU# is not impedance based. Secondly, your secondary injectors are too big.

rx7b13

So then thats the cause for my hessitation/lag issues then.

If so, then the Micotech is going in and removing the resistors. I got a budy that will do the tuning.

rx7b13

Oh and I forgot full emissions delete.

satch

iTrader: (1)

The excess fuel could cause lag but that doesn't guarantee that placing the right sized injectors will fix your problem but is probably will.

rx7b13

Right on, I've been trying to find the right injectors, but I can't find the red square top injectors with the offset notch. If I put the right injectors back in, I want them to be the ones that Mazda used for the car. And they're hard to find.

satch

iTrader: (1)

If need be, you could replace the injector plugs/clips to match the injectors which are the easiest to source.

DR_Knight

iTrader: (23)

Since car is 88, you can use s5 t2 550cc high impedance injectors. Just remove secondary injectors resistors.

Previous owner may have put those injectors in for safety margin on afr. Just be sure you want to lower cc of secondaries and not just get an rtek ecu, and benefit from the larger injectors. I've never ran a car on stock injectors since rtek ecu was available and added benefits of fcd, lower secondary staging, and dirt cheap.

rx7b13

Just talked to a buddy, I'm going to his shop this Sunday, we are going to go through my car with a fine tooth comb and, he has the factory secondaries that I need, and remove the inline resistors. We're going to put the N333 ecu in since that's what is supposed to be in it, assuming the previous owner didn't fry it with the 750 low imp injectors.