Audi A3 1.8T Throttle cut at high rpm range.

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Topic: Audi A3 1.8T Throttle cut at high rpm range. (Read 7247 times)

nyet

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	Re: Audi A3 1.8T Throttle cut at high rpm range. « Reply #15 on: August 19, 2023, 12:28:25 PM »

Throttle plate angle looks good, WGDC looks good, fueling looks right, ignition looks right.

MAF and pressure just drops off a cliff, for no reason. This means wg, turbo, inlet, or dv.


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abelko

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	Re: Audi A3 1.8T Throttle cut at high rpm range. « Reply #16 on: August 19, 2023, 12:36:42 PM »

hmm.. Maybe that's the case. But my DV is brand new stock, my turbo and WG are brand new checked by turbo specialist, and I've tried 3 different N75's which were brand new as well.
I've checked boost leaks and i had some on the intercooler piping but it was only a clamp loose. I'll check another boost leak test to see if there are another leak somewhere. :\
Thanks for the answers.


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abelko

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	Re: Audi A3 1.8T Throttle cut at high rpm range. « Reply #17 on: August 23, 2023, 05:50:51 AM »

Hello.
I've made a boost leak test and found out that my DV was leaking boost bad at closed postition, this was the only leak that I found. The N75 is good, the inlet piping seems good(no cracks or deformation.) I ordered a genuien new DV but it was bad too, it wasn't holding vacuum in it's vacuum chamber, so I replaced it with a new forge 008 and it's working fine but the car still hits the limit at 5600rpm.
I attach my new logs. Any thoughts? Huh

Thanks.


« Last Edit: August 23, 2023, 05:52:56 AM by abelko »	Logged

prj

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	Re: Audi A3 1.8T Throttle cut at high rpm range. « Reply #18 on: August 23, 2023, 07:22:19 AM »

Your inlet pipe is collapsing under vacuum created by turbo suction.
Fit a proper pipe and an air filter that isn't as restrictive.

There is no throttle cut.

Also your IAT is 68C, and the pull is only 6 seconds.


« Last Edit: August 23, 2023, 07:25:12 AM by prj »	Logged

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abelko

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	Re: Audi A3 1.8T Throttle cut at high rpm range. « Reply #19 on: August 23, 2023, 08:07:14 AM »

I'm running stock air filter. Is that the problem? XD
Thanks for your answer. Grin


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prj

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	Re: Audi A3 1.8T Throttle cut at high rpm range. « Reply #20 on: August 23, 2023, 08:56:34 AM »

Your problem is doing a half assed job.
Upgrade the intercooler and the intake, also the TIP and fit a less restrictive air filter.

Just changing the air filter will not solve it.
Also it will not solve the insane IAT.

Or if you want to run it like this, reduce boost to 0.6-0.7 bar.


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abelko

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	Re: Audi A3 1.8T Throttle cut at high rpm range. « Reply #21 on: August 23, 2023, 10:16:16 AM »

I'm aware of the IAT.. Cooler incoming. I just wanted a proper tune without that shit limit at 5500rpm.
BTW I went for a ride without the stock paper air filter and it went better. It still hit the limit, but at much higher rpm, around 6100.
Thanks for the help.


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nyet

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	Re: Audi A3 1.8T Throttle cut at high rpm range. « Reply #22 on: August 23, 2023, 11:53:18 AM »

With that fall off it can only be inlet collapsing.


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prj

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	Re: Audi A3 1.8T Throttle cut at high rpm range. « Reply #23 on: August 24, 2023, 03:35:33 AM »

Quote from: abelko on August 23, 2023, 10:16:16 AM

Proper tune is 0.5-0.6 bar on current hardware.
Unless you upgrade the hardware (intercooler, inlet pipe), then you have no business running the boost you are running.

If you set the boost at the correct level for the current hardware you will not have any cut.

Just because you bolted a bigger turbo on does not mean it does anything. In your case it does absolutely nothing except for increasing turbolag.


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abelko

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	Re: Audi A3 1.8T Throttle cut at high rpm range. « Reply #24 on: August 26, 2023, 02:58:49 AM »

okay


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