Thread: Turbo Problems Please Help!

well the safc I am using should let me change mafs accordingly but its not working out. I can try putting the stock ecu in and see what happens...

Thanks for the replies guys, really want to figure this out soon. I will work on it some tonight when I get off.

When you reinstall the stock MAFS temporarily disconnect the SAFC as well. Eliminating variables always helps.

The way the safc is wired in if I unplug it it would be like unplugging the maf itself. I can try it and it would probably run but it would just be running in limp mode.

Exactly, you should "unwire" the SAFC, return the wiring to stock and see if the car runs with the stock MAFS, which is what the JWT ECU is programmed for. How long will it take to unwire the SAFC and temporarily re-setup the stock wiring, 20 mins. It does not have to be pretty, just to see if it runs right.

I dont need to unwire the whole thing. All the wires are just tapped into on the harness to the safc except for the maf signal wire. I can just reconnect that 1 wire and see what happens.

I had to just order a new starter so once I get that in I will update with my finds.

Thanks you

As Alex said, you need to build a pressure tester, too. It's not JUST checking for boost leaks, it's checking for vacuum leaks that would be present when the vehicle is running and not in boost.

99% of drivability problems are related to vacuum leaks.

As he said before, it was running with the stock maf but only when the output voltage signal from tha maf going to the ecu was modified using the hotwire(maf signal)in and out settings on the apexi safc neo. At 7lbs of boost around 4k rpms. The wideband would go as far lean as it would read. I'm wondering if it's tuned for something like a cobra maf or some other maf?

I'm thinking that it was maxing out the maf, henceforth swaping in the z32. Mainly just looking for what the signal voltage difference is between the stock maf and z32.

That's why I said to bypass the SAFC and swap in the stock MAFS. Get it to run without the NEO before playing with the voltage signal. Take the NEO out of the equation. It is not maxing out the stock MAFS @ 7 lbs. Also are you sure that the stock MAFS you are using is not broken. I would swap the stock MAFS you are trying to use into another car to see if it works. I am pretty sure that if the JWT ECU was tuned for anything else but the stock MAFS it would state it. I would call JWT to confirm. The chip inside the ECU may also be marked from JWT and they may be able to tell you more based on that.

Like the others said you have to pressure test before you try anything else, especially if you have never tested it after piecing together the intercooler piping/setup. Pressure testing is as important as making sure there is oil in the car. You are just wasting time if there is a vaccum leak somewhere.

already tried running it with the stock maf, jwt ecu, apexi controller completely unhooked. Just using the striaght signal from the maf to the ecu. didnt run. swapped the maf from my running nx, still didnt run. swapped the stock ecu, stock intake/maf/airbox from my nx. ran great other than pig rich with the 370's. When we add in the JWT ecu, thats when the maf starts giving trouble.

Note, Jwt ecu with stock maf un plugged started and idled fine but obviously wouldnt rev past 2500 rpm with the maf unplugged. Plug stock maf back in and the car dies almost instantly.

Im pulling the ecu apart in a couple of minutes to get the numbers off the chip. I talked to ben at JWT earlier today and he said he could tell me what its tuned for.

Nice, hopefully Ben can tell you what's up.