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Old 01-17-2012, 05:47 PM   #1
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Question Xede Keeps Stalling Engine Under Boost

Hey guys...

Finally got my supercharger setup all installed and running. Ran into some complications with a vacuum leaking holding me up, but that was fixed and all is well mechanically with the install.

When I "baby" the car and drive with nothing more than 30% throttle, staying under 3,500 rpms, and not exceeding 50mph, the car runs fine. Idles around 900rpms and idles well.

However, when the car under goes boost, it will stall the engine out with letting off the gas. (Note: Can cause a very unsafe drive when the power steering goes out and you are in a turn, I'd know now.) Stephanie at Begi sent me the map that I am using and it's basically the startup map. I've had a friend (who works for a shop) come over and inspect all the hardware, and all is good, however he doesn't know too much about tuning (besides the basics).

I've got a MTX-L wideband installed in the car, and it idles at around 15. When parked and in neutral, revving the engine seems to bog it down and seems like it's having a hard time staying alive. Usually idles at 900 and after giving a little gas to rev, it'll go to about 550 and then act like dying.. then finally rev. Hoping that makes any sense.

From what I've been reading, this might be caused be the engine becoming too flooded out with gas when undergoing boost. I'm using the yellow RX-8 Deneso 4550 injectors (425cc's). I'll upload a photo of the map that is being run as soon as I get home, but I wanted to try and see if I can get any help in resolving this.

Does this possibility of stalling the engine out sound plausible? Or, am I just reading to much and reading stupid crap?

Any help would be greatly appreciated as I've been out of a DD for 3 months now. Bumming rides and borrowing cars is getting old, to be honest. I miss my NB. Also, I might require "noob" answers as this is my first boosted car (besides a stock 1.8t Jetta).

PS: It's on a 01 with a MP62 hotside kit (TDR intercooler, TDR tensioner, 190lph fuel pump).
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Old 01-18-2012, 03:28 PM   #2
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I guess not much Xede action around these forums...
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Old 01-18-2012, 05:30 PM   #3
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Just realized I never posted that photo... Here is some more visual aids to my problem.

A video showing the tach and wideband when revving and at idle:

The Xede Map:
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