install z32 maf, 555 injectors, power fc then car can't drive in the cold

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Fenvy
Posts: 5052
Joined: Thu Jan 29, 2004 9:30 am
Car: 2005 350Z Base 6MT

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my s13 with sr20det swap was fine. About 2 weeks ago I installed z32 Maf (obdii version), nismo 555cc injectors, power fc (brand new).

I don't know too much the options available via commander. The only thing I chnaged is disabling the boost controller and set the injector duty to about 66.5% since 370/555=67%.

The car drives fine when it's warmed up for about 5 min. At this point, the water temp is about 75C and ignition timing about 15 degree and idles around 800rpm. I can boost and drive it fine.

However, here is the problem: 1) when the car is cold, it needs 2 cranks to start to car. The 1st crank doesn't really want to start and I don't want to turn the key too long or I am under the impression that the ignition coil (or ignitor chip?) might burn out. So on the 2nd crank it will surely crank and start. 2) If I drive the car immediate at a cold state. (For instance, trying to reverse) As soon as I step on the gas alittle the idle will drop below 800rpm to the point of stalling if I don't gas it some more.

Once the car is warmed up, however, the problem will go away. What do you guys think could be the problem?


Chris111
Posts: 99
Joined: Fri Jan 07, 2005 10:51 pm

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You should always let you car warm up before you drive it. I'm not positive on this but if i'm right then the power fc doesn't allow the car to idle higher than it would when it's warmed up? My friend just put a power fc in his fd and it starts and idles at 800rpms. Correct me if i'm wrong.

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Fenvy
Posts: 5052
Joined: Thu Jan 29, 2004 9:30 am
Car: 2005 350Z Base 6MT

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no, it idles at warm up rpm but if I even give it the slightest and I do mean slightest such as a tap, then the rpm drops

power fc has a water temp correction.. how does that work?

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rico05
Posts: 6895
Joined: Mon Jun 23, 2003 6:52 am
Car: 1992 RMS13 w/ CA18DET
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Not sure on the mapping of a PFC, but I know that the stock ECU will run the car rich when cold. PFC may be doing this as well, and if not tuned for the 550s correctly, it may be running it too rich at idle. Just a shot in the dark...

Chris111
Posts: 99
Joined: Fri Jan 07, 2005 10:51 pm

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Yeah I wasn't even thinking about what you said about having injectors and z32 maf. The base map on the Power FC is tuned to for the car in stock form with intake and exhuast. I'm sure it's because you have a z32 maf and injectors. Get it tuned and take advantage of them and tell us how it went.


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