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Quick throttle blip results in stumble

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Old 07-13-18, 09:35 PM
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Quick throttle blip results in stumble / stumble under boost

Hey guys, just wanted to see if this was normal and some potential fixes with the datalogit. My car is all stock minus the power fc, and if I quickly blip the throttle I'll hear a suction type noise and the rpm will dip, motor will stumble, then all recovers. I can slowly rev with no stumbling issues, it's only if I do it quickly. I read up on some ideas behind this, but all of those motors were modded. Has anyone experienced this on an all stock motor? If so, what are the fixes? Thanks,


Joe

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Old 07-13-18, 11:43 PM
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What engine?
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Old 07-13-18, 11:52 PM
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93 Californian car with all original parts 67k miles. Air pump etc is all installed, it almost sounds like some sort of air pump suction noise. Vacuum is fine at 470 mmhg, don't suspect a leak.
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Old 07-14-18, 06:00 AM
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Throw a wideband oxygen sensor on there... I'd bet the car is running extremely rich during this transition. Should be around 0.85 Lambda under a quick blip (high load), then taper off to 1.00 Lambda (stoichiometric) as it settles.
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Old 07-14-18, 01:26 PM
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Download the map and load it here. Even the stock PFC map has bad values in it!
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Old 07-14-18, 01:44 PM
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Originally Posted by cewrx7r1 View Post
Download the map and load it here. Even the stock PFC map has bad values in it!

Actually just sent you an email with the Igt, Igl, Ing, and base map screen shot! I had some stumble under boost today when I was heading into Cars and Coffee, first time I've experienced that. I did the idle relearn process when the car was already warm, so the fans came on during the "no electrical load" first 10 minute portion. I'm letting the car cool all the way down today and then I'm going to do the relearn (I already reinitialized). Here are my results from the current map installed...


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Old 07-15-18, 10:40 AM
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Here is the map currently installed (.dat file) with the fan speed changes I've made under setting 3 tab. I've also thrown in 2 data runs on 3/4th gear pulls into the .RAR file here.
Attached Files
File Type: rar
Datalogit logs.rar (88.7 KB, 2 views)
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