Overboosting after installing 3" catless downpipe - SRT Forums

Eblue srt4 · 11-27-2012, 12:37 PM

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.?

tunerlover3 · 11-27-2012, 12:40 PM

How much boost is overboosting.

Eblue srt4 · 11-27-2012, 02:14 PM

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.

Mrturbo24 · 11-27-2012, 02:31 PM

Turn the boost down via the dsp and datalog..

Check all the lines for leaks including the intercooler cuppletrs

Eblue srt4 · 11-27-2012, 02:33 PM

that was the plan. thanks

Mrturbo24 · 11-27-2012, 02:37 PM

Howd the exhaust bolt up? No exhaust leaks?

Eblue srt4 · 11-27-2012, 02:53 PM

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

Bloo magoo · 11-27-2012, 03:46 PM

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)

Eblue srt4 · 11-27-2012, 03:51 PM

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

Bloo magoo · 11-27-2012, 03:54 PM

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.

Eblue srt4 · 11-27-2012, 03:59 PM

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

Bloo magoo · 11-27-2012, 04:06 PM

With the new dp your lean anyways, and when boosting are you over boosting and holding or does it keep climbing?

Bloo magoo · 11-27-2012, 04:14 PM

Still have questions on Vac line setups? Look here:
Honestly man i would Recheck your vacuum lines.

Eblue srt4 · 11-27-2012, 04:16 PM

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

Eblue srt4 · 11-27-2012, 04:41 PM

Quote: Originally Posted by Bloo magoo

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.

11-27-2012, 12:37 PM	#1 (permalink)
Eblue srt4 SRTforums Member Join Date: Nov 2012 Member Number: 91428 Location: Michigan Posts: 25	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.?

11-27-2012, 12:40 PM	#2 (permalink)
tunerlover3 Fresh Meat Moderator Join Date: Dec 2009 Member Number: 76568 Location: Chicago Posts: 16,617	How much boost is overboosting. __________________ Diablo CMR tuner ~Dan~ 2004 Black Neon SRT4: E85 stock turbo SOLD 310HP 436TQ 2004 Eblue Neon SRT4: E85 5558 XXXHP XXXTQ

11-27-2012, 02:31 PM	#4 (permalink)
Mrturbo24 SRTforums Member Join Date: Dec 2011 Member Number: 87344 Location: New jersey Posts: 424	Turn the boost down via the dsp and datalog.. Check all the lines for leaks including the intercooler cuppletrs __________________ Mods: Tial BOV, BC Coilovers, Aem CAI, Aem Wide, dsp 93 tune Last edited by Mrturbo24; 11-27-2012 at 02:34 PM.

11-27-2012, 02:37 PM	#6 (permalink)
Mrturbo24 SRTforums Member Join Date: Dec 2011 Member Number: 87344 Location: New jersey Posts: 424	Howd the exhaust bolt up? No exhaust leaks? __________________ Mods: Tial BOV, BC Coilovers, Aem CAI, Aem Wide, dsp 93 tune

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11-27-2012, 02:14 PM	#3 (permalink)
Eblue srt4 SRTforums Member Join Date: Nov 2012 Member Number: 91428 Location: Michigan Posts: 25	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.

11-27-2012, 02:33 PM	#5 (permalink)
Eblue srt4 SRTforums Member Join Date: Nov 2012 Member Number: 91428 Location: Michigan Posts: 25	that was the plan. thanks

11-27-2012, 02:53 PM	#7 (permalink)
Eblue srt4 SRTforums Member Join Date: Nov 2012 Member Number: 91428 Location: Michigan Posts: 25	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

11-27-2012, 03:46 PM	#8 (permalink)
Bloo magoo SRTforums Member Join Date: Aug 2012 Member Number: 90281 Location: Around Posts: 140	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)

11-27-2012, 03:51 PM	#9 (permalink)
Eblue srt4 SRTforums Member Join Date: Nov 2012 Member Number: 91428 Location: Michigan Posts: 25	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

11-27-2012, 03:54 PM	#10 (permalink)
Bloo magoo SRTforums Member Join Date: Aug 2012 Member Number: 90281 Location: Around Posts: 140	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.

11-27-2012, 03:59 PM	#11 (permalink)
Eblue srt4 SRTforums Member Join Date: Nov 2012 Member Number: 91428 Location: Michigan Posts: 25	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

11-27-2012, 04:06 PM	#12 (permalink)
Bloo magoo SRTforums Member Join Date: Aug 2012 Member Number: 90281 Location: Around Posts: 140	With the new dp your lean anyways, and when boosting are you over boosting and holding or does it keep climbing?

11-27-2012, 04:14 PM	#13 (permalink)
Bloo magoo SRTforums Member Join Date: Aug 2012 Member Number: 90281 Location: Around Posts: 140	Still have questions on Vac line setups? Look here: Honestly man i would Recheck your vacuum lines.

11-27-2012, 04:16 PM	#14 (permalink)
Eblue srt4 SRTforums Member Join Date: Nov 2012 Member Number: 91428 Location: Michigan Posts: 25	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

11-27-2012, 04:41 PM	#15 (permalink)
Eblue srt4 SRTforums Member Join Date: Nov 2012 Member Number: 91428 Location: Michigan Posts: 25	Quote: Originally Posted by Bloo magoo 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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