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Old 11-27-2012, 12:37 PM   #1 (permalink)
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Default Overboosting after installing 3" catless downpipe

mods are godspeed fmic, stage two wg, grennitelli coil/wires, ngk iridiums, aem cai, stock turbo. 3' catless dp with 3" straight piped side exit

After installing the downpipe my srt started overboosting. My thoughts are with the less restricted exhaust is causing it. plan was to unlock my dsp to try and turn the boost down and see if that fixes it. what do yous think.?
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Old 11-27-2012, 12:40 PM   #2 (permalink)
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How much boost is overboosting.
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Old 11-27-2012, 02:14 PM   #3 (permalink)
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Before i was spiking 20 and holding at 17psi and after putting the downpipe on its boosting way over 20 psi. i have stock boost gauge and it just keeps going till the needle is facing straight down. and all vacuum lines are good. check them today and replaced one.
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Old 11-27-2012, 02:31 PM   #4 (permalink)
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Turn the boost down via the dsp and datalog..

Check all the lines for leaks including the intercooler cuppletrs


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Mods: Tial BOV, BC Coilovers, Aem CAI, Aem Wide, dsp 93 tune, 3inch mpx (catless)exhaust, mpx bfmic, 1/3/5 gear extender

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Old 11-27-2012, 02:33 PM   #5 (permalink)
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that was the plan. thanks
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Old 11-27-2012, 02:37 PM   #6 (permalink)
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Howd the exhaust bolt up? No exhaust leaks?


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Old 11-27-2012, 02:53 PM   #7 (permalink)
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none between the o2 housing and downpipe. i replaced the gasket too. but i have a small one where the midepipe bolts up. small one but that wouldnt cause overboosting
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Old 11-27-2012, 03:46 PM   #8 (permalink)
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Do you have an afr gauge?
Your probably running lean now too.
I would reset your fuel trims, turn down the target boost and re tune the afrs.
And if you have an exsauhst leak your afr gauge will be off.(before o2 bung)
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Old 11-27-2012, 03:51 PM   #9 (permalink)
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well the dsp is not on my car right now. and no i dont have a wideband yet. when i get one thats when the dsp is going on. and weird thing is i never got a check engine light after putting the catless dp on. usually people due get one cause no cat
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Old 11-27-2012, 03:54 PM   #10 (permalink)
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Do you still have both o2 sensors?
What do you mean by the dsp is not on your car right now?
And if your do any performance mods an afr gauge is absolutely mandatory.
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Old 11-27-2012, 03:59 PM   #11 (permalink)
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yes both o2 sensor are still on car. and i know why do u think i said i did not put the dsp tune on the car yet. because they run lean so im not putting it on till i buy a wideband so i can see when it leans out and i can add the additional amount of fuel it will need
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Old 11-27-2012, 04:06 PM   #12 (permalink)
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With the new dp your lean anyways, and when boosting are you over boosting and holding or does it keep climbing?
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Old 11-27-2012, 04:14 PM   #13 (permalink)
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Still have questions on Vac line setups? Look here:
Honestly man i would Recheck your vacuum lines.
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Old 11-27-2012, 04:16 PM   #14 (permalink)
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idk about the lean part. the other day i started my car and all i could smell was gas coming out the side exit. but the boost gauge looks like it will keep going but im not going to see because it not good to be boosting that much on stock turbo all i can see is it goes past 20 psi on my stock gauge
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Old 11-27-2012, 04:41 PM   #15 (permalink)
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Quote: Originally Posted by Bloo magoo View Post
Still have questions on Vac line setups? Look here:
Honestly man i would Recheck your vacuum lines.

I did the car boosted good before and the vacuum lines are crack free and in the right spots for the setup i have. i checked many times.
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