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I am Posting on behalf of a best bud who doesn't have posting privilege yet.
He went to one of the most well known shops in FL to have his water pump changed because it was leaking. They also replaced the thermostat and I don't know the temperature of the old or new. Supposedly without any other changes the car fumbles and falls flat on its face at just about 4000rpms now with the pfc and can not Rev past. He has stock injectors and a professional tune which was running great. sequential with bolt ons. So we install the stock computer and it runs great. To me it sounds like a secondary injector setting in the pfc. Would you be able to direct me to correctly input this through the commander for stock 850 secondaries?
After probing I was told that the shop did handle the commander and believe they accidentally made changes as they're not familiar with the pfc. It's terrible because the car had been running on this tune from Rotary Performance for years and was extremely reliable. Can you think of any other setting changes that could have been made on commander that could cause this? Or any other explanation from changing a waterpump and thermostat and not having pfc work past 4k while stock ecu works perfect?
Is there a way to undo the changes that were done last week or to know what changes were made? Unfortunately we don't have a copy of the map. Thank you for any leads
That's too bad that someone was messing with the commander. First off, check the rev/idle settings in the commander. It is accessed through the settings menu and is the last option on the right side. Within that menu, the first setting is the rev limiter. That number should be above 8000 rpm or so depending on who tuned the car. If it is set for some reason to 4000ish rpm, that would be your problem. Next, you can check the injector settings. In the settings menu, on the bottom left is where they are. In the injector menu, at the bottom, the secondary settings are "Q-sec" and in your case should read what size your sec injectors are (850cc) etc. I would warn him that changing vital settings could cause severe issues with the car including a blown engine. I recommend that he has the map reviewed by a competent tuner and make sure that the engine is maintaining a safe AFR at the least. Again, it is too bad that someone took it upon themselves to mess with the commander and the pfc settings.
Last edited by furious_rotation; 11-08-15 at 09:01 AM.
Reason: Punctuation
I can't guarantee that it was the change to settings that is causing the issue since I was not there.
But when you change a waterpump and also had the commander in your hand and the car won't go above 4k on the initial test drive after. And was running fine for years before and runs perfect on stock ecu. It leads me to the commander settings as the culprit. Again I could be wrong but can't imagine anything else it could be that's why I started the thread.
If it was me I'd have the shop reimburse me for a retune if we can't figure out the settings issue.
I will have my friend attempt to check the injectors and the Rev limiter and hope it is that easy.
For sure. I am amazed that they admitted to accessing the commanders menu in the first place. As you say, the problem could undoubtedly be caused by something else. At least you have a smoking gun that the shops prints are all over.
The shop didn't have to admit it my friend was there while they perused through the commander looking for settings and the shop is not familiar with pfc.
I will check the Rev settings and boost settings too.
Can anyone suggest a shop or tuner in Orlando that would be able to fix an easy settings issue like this?
I don't have access to the car and I'm not sure if my friend is comfortable as he's new to rx7s.
Highly unlikely that they altered a single cell, that is far more complex.
Another option is to just reset the PFC to the Apexi base map. It depends on what the mods are on the car. That fact that it can still run on the stock ECU implies that it is not highly modified, which means the base map is probably fine.
Highly unlikely that they altered a single cell, that is far more complex.
Another option is to just reset the PFC to the Apexi base map. It depends on what the mods are on the car. That fact that it can still run on the stock ECU implies that it is not highly modified, which means the base map is probably fine.
That's great news, seems like there's a chance we can figure out what was changed and revert back to it.
Yes I mentioned to my friend that he can run the base map at worse but it sucks to lose a customized map that was done by a highly competent shop and had the car running perfect. Drivability was spot on.
The car has intake and full catless exhaust, underdrive pulleys and a Pettit street ported motor with 3mm seals. The street port is what concerned me on stock ecu so we loosened a boost coupler for now to keep it at 3-psi getting into the engine.
I guess you could say the car is not that modified but it kind of is. It's just not single turbo.
Thanks for the feedback! I really appreciate the help. I am going to attach pictures I took of the PFC after starting up the car in my garage. Everything looked normal to me, but the car smelled as if it were burning a lot of fuel. Much more than when the stock ECU is connected. Please take a look and let me know if anything looks out of place.
Your car is reading 3.5 psi of boost while not running. Go to the map sensor screen and verify that it is set to "Normal", since you have the stock map sensor in the car.
Settings > PIM volt > Normal
Last edited by Banzai-Racing; 11-11-15 at 05:41 AM.
11-08-15, 08:08 AM
