Swap Begins: Escort GT -> Escort GTX

[EscortNation]

I'm using the N/A ECU and a slightly "tuned" RX-7 VAF. My car def runs rich at idle - the A/F gauge is pinned in the rich zone and you can smell it.

What VAF are you using?

Stock escort gt

[Lex]

That might be one of your issues - have you tried tuning it at all? It tunes the same way an RX7 one does .... but has different dimensions so that factors in as well with respect to air volume, velocity ... and signal it sends to the ECU.

The VAF itself might be insufficient for the turbo application. However, give this a try - pop the cap on the VAF and move the tuning wheel to soften the spring on the flap (so the flap moves easier) Move it a few notches and idle the car and see if that reduces your lean idle issues

[EscortNation]

That might be one of your issues - have you tried tuning it at all? It tunes the same way an RX7 one does .... but has different dimensions so that factors in as well with respect to air volume, velocity ... and signal it sends to the ECU.

The VAF itself might be insufficient for the turbo application. However, give this a try - pop the cap on the VAF and move the tuning wheel to soften the spring on the flap (so the flap moves easier) Move it a few notches and idle the car and see if that reduces your lean idle issues

Just seems strange that the gtx injectors are high impedance and are working as low impedance

[scortadict]

ok you guys say that you dont need a resistor box so why with my gtx harness i got a resistor box??? the gtx injector are not low impedance??? that mean it need a resistor box??

good to heard your car its running lex

[Lex]

The issue of impedence depends on many aspects. First of all, what is the impedence difference between the two injectors - usually the difference is very small (in the couple of ohms range). This impedence limits the current flowing through the injectors and a couple of ohms impendence will not affect current very much.

In other words, I think that the resistor box does not raise the resistance enough to prevent the GTX injectors from working properly. I have measured the resistance of the box and it is 1.5 Ohm. That is very very little resistance. Inside the box you basically have a spaced out coil of wire inside a ceramic shell. Tonight I will measure the resistance of my GT and GTX injectors and compare the values and see where we sit with that.

There are two issues to consider here:

1. The resistor box prevents the low impedence injectors from overheating and failing in the stock NA setup

2. The resistor box increases the resistance of the high impedence injectors (GTX) and may cause the injectors to take longer to open. I am talking about fractions of a second longer because from personal experience of driving the car - it gets plenty of fuel - so they DO open.

I will investigate the matter a bit more on my car and get back to you.

For a good read on injector theory, go here:

http://www.stealth316.com/2-injectortypes.htm

[Lex]

scortadict, wasn't that picture of a resistor pack used for your GTX fuel pump?

[scortadict]

scortadict, wasn't that picture of a resistor pack used for your GTX fuel pump?

by the look of it its seem to be a resistor just like the egt. i'm sure someone can tell me what it is exactly hehe. the gtx injector are 12-16 ohm

thanks for the link

[EscortNation]

by the look of it its seem to be a resistor just like the egt. i'm sure someone can tell me what it is exactly hehe. the gtx injector are 12-16 ohm

thanks for the link

Ya that isnt for teh injectors. Your injector resistor box is sitting right where your hammer is

[Lex]

12-16 ohm?? Where did you get that figure from? Is it 12 or is it 16? Because you can see that if they are in the range of 12-16 ... adding 1.5 ohm would not really matter.

And no, the GTX does not have an injector resistor box, that is, like jordyB said a resistor pack for the fuel pump

[EscortNation]

So Lex, do you think that tuning the gt maf will cure the leaness through out the rpm range? I really hope thats all that is needed then. Thanks again for your help

Chris

[scortadict]

yea i juts found it in the gtx manual, its a fuel pump resistor and next to it its the relay. i learn everyday Lex if you want the gtx manual, hit me on msn messenger, savoie18@hotmail.com

[scortadict]

i found another interesting thing about the resistor box that its near the hammer, they call that a DRL resistor, day runing light resistor and the drl relay next to it in the protege manual service. weird....

[elscotto80]

I do not know if this will be any help to you, but I am running GTX injectors off the EGT harness with a GTX ecu plugged in. VAF is the stock EGT tuned 3 clicks, thing runs like a beast.

[Lex]

Aw ****! That makes so much sense scortaddict - that's why the damn resistor box is not shown in any of the wiring diagrams for the injectors!!!!! It's a DRL resistor box! Who the hell started that rumor that the Canadian EGTS have an injector resistor box?? And who made it into the rumor that the Canadian EGTS have low impedence injectors???

When I get home tonight, I am measuring the impedence of my GT and GTX injectors and putting an end to this controversy.

[elscotto80]

in which direction?

I really dont know, I did it over a year ago. They had to be leaned out cause I was using the EGT ECU at first, now I have GTX ECU, maybe I should play around with it again...