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TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old September 12th, 2017, 07:59   #1
tom101
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Default External Wastegate on exhaust TDI with DPF

Hello,
I'm thinking about install a wastegate on the exhaust manifold. I have the egr pipe avaliable on the manifold.
I'm going to remove downpipe and mount DPF due to MOT every year (the car has 10 years), so I have to detune so much due to dpf.
and a waste gate in the exhaust seems to me a good option to avoid excesive exhaust gas pressure.
Anybody has mounted one like this?
My car is a 3.0 tdi, but it may be usefull for any tdi with dpf

thanks

Last edited by tom101; September 12th, 2017 at 16:33.
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Old September 12th, 2017, 08:06   #2
diffas
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So your plan is to bypass dpf with wastegate? You need at least 60mm wastegate for that
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Old September 12th, 2017, 09:23   #3
740GLE
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and a waste-gate that can handle what? 1700F?

typical wastegates/bypass valves are used on the charged air circuit right? Maybe the exhaust flapper valve on the CR may work better but doesn't seal 100% as its a rough butterfly valve.
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Old September 12th, 2017, 09:28   #4
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I have no idea what problem you are trying to find a solution for.
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Old September 12th, 2017, 09:53   #5
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Quote:
Originally Posted by 740GLE View Post
and a waste-gate that can handle what? 1700F?

typical wastegates/bypass valves are used on the charged air circuit right? Maybe the exhaust flapper valve on the CR may work better but doesn't seal 100% as its a rough butterfly valve.
Charged air in the exhaust? Well these normally work around 850-950c on gasoline engines so adding it to to the exhaust to bypass dpf you probably see only 600-700c. There are also watercooled wastegates.
And indeed flap is way better and smaller to bypass dpf
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Old September 12th, 2017, 10:03   #6
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My 3.0 tdi has bigger turbo and upgraded CR fuel pressure. 360hp and 800n/m

I'm going to remove downpipe and mount DPF due to MOT every year (the car has 10 years), so I have to detune so much due to dpf.


I'm looking for someting that help me to detune less.

Not a full bypass, just something to reduce EGP

something like that. but works only with a spring, when the egp is high, opens. Will reduce egt and egp.




thanks you very much

Last edited by tom101; September 12th, 2017 at 10:26.
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Old September 12th, 2017, 10:34   #7
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Quote:
Originally Posted by diffas View Post
Charged air in the exhaust? Well these normally work around 850-950c on gasoline engines so adding it to to the exhaust to bypass dpf you probably see only 600-700c. There are also watercooled wastegates.
And indeed flap is way better and smaller to bypass dpf

install a flap and a system to command it, seems difficult.

I'm looking for something easy to install. Have seen this wastegates on ebay, and springs to change open pressure.

But I don't know what pressure would be ok to set up the spring
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Old September 12th, 2017, 12:08   #8
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Exhaust flaps can be controlled by vacuum, boost or electronic. If you have boost creep with wg helps, otherwise not that much. What kind s turbo you have if you have emp problem? Some silly hybrid?
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Old September 12th, 2017, 16:15   #9
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is the original turbo of new 3.0 tdi 272/286ps. I run 105mg and 2.05 bar boost

Now with downpipe I have no problems, the car is amazing,

but I will install dpf soon, and I will have to detune so much, or the dpf will burn.

I'll lose many hp (60 hp at least.)

So I'm thinking about wastegate to allow me get some extra power with dpf. And easy to install

Last edited by tom101; September 12th, 2017 at 16:19.
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Old September 12th, 2017, 17:43   #10
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Quote:
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I have no idea what problem you are trying to find a solution for.
This.
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Old September 13th, 2017, 05:58   #11
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Quote:
Originally Posted by tom101 View Post
My 3.0 tdi has bigger turbo and upgraded CR fuel pressure. 360hp and 800n/m

I'm going to remove downpipe and mount DPF due to MOT every year (the car has 10 years), so I have to detune so much due to dpf.


I'm looking for someting that help me to detune less.

Not a full bypass, just something to reduce EGP

something like that. but works only with a spring, when the egp is high, opens. Will reduce egt and egp.




thanks you very much
So that bypasses the DPF and the turbo? how is that better? how will that help when you don't have to pass the MOT and want the turbo to boost as much as possible? Unless you want the valve after the turbo and only divert EG to the DPF under MOT testing and normal testing free flow.
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Old September 13th, 2017, 09:19   #12
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The wastegate is pre-turbo. You'll also lose power when it opens. I'd just tune out a few hp if it's really a problem for the dpf(going to need a new tune regardless). Really doubt it would be necessary to tune out 60 hp.
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Old September 13th, 2017, 17:12   #13
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Why are you attempting to do this?
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Old September 13th, 2017, 17:28   #14
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Originally Posted by turbobrick240 View Post
The wastegate is pre-turbo. You'll also lose power when it opens. I'd just tune out a few hp if it's really a problem for the dpf(going to need a new tune regardless). Really doubt it would be necessary to tune out 60 hp.

Hope you are right. I'm asking my chiptuner a soft al least agressive as stage 2+, but with safe limiters when high temperatures or pressures are reached.

I got the dpf cleaned with liquid in a machine. The result was so good.


If I got dissapointed with the result, probably I will try a wastegate, my first idea was to place it between turbo and dpf, but it's not that easy as use EGR pipe.
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Old September 13th, 2017, 17:33   #15
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It seems he is trying to bypass the DPF partially when exhaust pressures are high (high engine load). Bypassing it would reduce the soot accumulation somewhat, yes, and car wouldn't complain on emissions inspections.

I don't think it's too terrible idea, just don't know how much it would help though, if it's not too much exhaust being rerouted.
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