Light throttle surgeing and leaning - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-28-2008, 12:23 AM   #1
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Default Light throttle surgeing and leaning

I am getting a bit of light throttle surging, they car is pretty close to it's targets (I think the O2 seems to have had a LOT of Noise) but the surge is there when still around 70-80 Kpa and lightly accelerating on up to 100Kpa where the car will go lean and I cannot add enough fuel.

targets are 12.5 at 100 Kpa and 13.5-14.0 around 70
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Old 10-28-2008, 12:26 AM   #2
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You should put your specs in your sig and location in your profile. What injectors do you have? Do you have the mspnp?
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Old 10-28-2008, 12:27 AM   #3
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Sorry, Bone stock 1.6 with MSPnP and AFM delete.
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Old 10-28-2008, 12:48 AM   #4
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So it's lean everywhere?
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Old 10-28-2008, 12:52 AM   #5
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I run my targets a bit lean anyway, but it leans and swings to 18 at 100Kpa then I lift and stays till I roll back into part throttle..
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Old 10-28-2008, 01:08 AM   #6
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So i am to assume that you have a wideband?
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Old 10-28-2008, 01:11 AM   #7
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Yes
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Old 10-28-2008, 01:15 AM   #8
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You should REALLY create a signature with everything that you have installed. See under my posts? It's not there to show off, (well it kinda is) it is there so that when i ask a question, people don't have to ask me about my setup. The more information you provide, the more help you will get.

Given the info that you have provided so far, i would advise you to check your fuel pump.
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Old 10-28-2008, 01:33 AM   #9
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are you using the mspnp base map?
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Old 10-28-2008, 01:36 AM   #10
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it was, ran MLV a couple cycles but it feels the same
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Old 10-28-2008, 02:25 AM   #11
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Have you tried you AE (Acceleration Enrichments under Acceleration wizard) when mine was bone stock I had to bump up the values in AE by .4 or .5 ms, what happens when you jab the throttle form it being shut is there is a lean spike in light throttle or trailing throttle you may have is fluctuating so you have to look at your overrun setting (trailing throttle) or acceleration setting (light throttle).

It is listed in the Megamanual here and here this is all assuming you are using the diypnp maps supplied by diyautotune.
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Old 10-28-2008, 11:14 AM   #12
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I might try AE settings.

I am having MAP isues now.

I moved the Map to the FPR line and it got rid of some noise at idle but at cruise the log is MUCH more noisy and I am also not getting as strong a signal on the digital dash OR my Boost guage.

I was getting around 40Kpa at cruise now at 56 or so, I was getting arounf 15-17 inhg now it bairly hits 10.
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