Chrome user having major issues and out of ideas!

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Originally Posted by Streamln1

Have you checked the fuel filter? Did the car sit for a long time by chance?

I ask because I had similar problems with my fuel pressure dropping dangerously low at WOT, had twin walbros and aftermarket FPR, etc etc.

Problem was a supply issue, my fuel filter kept clogging up, found it was debris from the tank that had built up from sitting for too long. I would for sure LOG the fuel pressure while driving.....see if it drops when you see the lean condition, then its for sure a supply issue.

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I thought this could be the issue but this would be the case under all conditions, not just when the car got warm or when in closed loop. Also it wouldn't be running right with stock ecu and the stock injectors either if it was a true fuel supply issue.

Did a little bit more testing today. Car is running good with the stock injectors. Only things that I am noticing in the log is the front low fuel trim is stuck at 12.5 rear low is about 7.5 but they do change. Mids are both at 3.25 Also the Idle is steady, but at times the idle switch does not show on when sitting? Should that not come back on every time you come to a stop? Adam Im shooting you an email, I would like you to check this ecu out before I return this car to 3SX. I need to make sure this ecu is sound before I go about trying to get this sorted out with them.

You aren't just using published values for the 850s are you? The numbers from the manufacturer are useless.



Download merlins tuning guide for evos and get the latencies they used for the fic or pte style 850s.



Start with 850 for the scaling though. Evos use a different scaling formula.

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Originally Posted by Forest Gump

You aren't just using published values for the 850s are you? The numbers from the manufacturer are useless.

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This, this, this!

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Originally Posted by Forest Gump

You aren't just using published values for the 850s are you? The numbers from the manufacturer are useless.



Download merlins tuning guide for evos and get the latencies they used for the fic or pte style 850s.



Start with 850 for the scaling though. Evos use a different scaling formula.

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I just plugged in the values of the sheet and took it to 3sx, I told them to double check it. I assumed that was part of the tune. You think that's why the car was running so jacked up. Also the latencies I typed in were for 43.5 psi base pressure but the car had a 50 PSI base pressure. I didn't have a AFPR at the time.

The latencies have a huge effect on idle and part throttle.

People would be better off using the stock latencies than what the injector sheet says.

I'm sure there are two sides to any story,but it really sounds like the guy tuning your car doesn't know how to setup chrome.

As I mentioned earlier, your issues sound very much like what I went through with my latencies. My experience ended in bearings needed due to contaminating the oil with fuel.

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Originally Posted by CoopKill

As I mentioned earlier, your issues sound very much like what I went through with my latencies. My experience ended in bearings needed due to contaminating the oil with fuel.

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I have the car straight now with the stock injectors.....its just a matter of getting the ECU checked. After that I will need to address this issue with 3sx. Honestly I cant believe they gave me this car back driving the way it was. Like Forest said there are two sides here, and I want to give them the opportunity to address this before I go off the deep end. For now any information or opinions that will help me make my case based on the info I have posted is much appreciated, and as always I greatly appreciate the help and input. Greg, you broke the code, what do you think?

You said you're running stock injectors. Are you using the flash ECU now?

Are you sure your injectors are what you think they should be?